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  • 201.
    Kasselstrand, Anna
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Lindström, Fredrik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Adolfsson, Christian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Lindberg, Jakob
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Rullmotståndsmätare för solida hjul: Konceptuell framtagning av en prototyp för mätning av rullmotstånd hos solida hjul med huvudfokus på rullskidhjul2017Självständigt arbete på grundnivå (kandidatexamen), 12 poäng / 18 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Sporten rullskidåkning har vuxit från att tidigare bara ha varit ett sommarkomplement för längdskidåkning till att idag vara en helt egen disciplin med både världscupstävlingar och världsmästerskap. Trots detta finns idag ingen standard för att mäta och klassificera rullmotståndet i rullskidhjul. Rullskidhjulen tillverkas i fyra olika klasser, 1-4, där ettor rullar lättast och fyror rullar trögast. Det finns i nulägetingen standardiserad metod för att bestämma klassen på ett rullskidhjul och hjul inom samma klass kan skilja sig åt mellan olika tillverkare. Detta leder till orättvisa tävlingsförhållanden där mer än utövarens fysiska förmåga bidrar till prestationen.

    Syftet med projektet är att ta fram en prototyp för rullmotståndsmätning på rullskidhjul. Önskvärt är att projektet ska ge en grund för att skapa rättvisa på marknaden, dels genom att bidra med en prototyp som kan ge en rättvis och kontinuerlig mätning av rullmotstånd samt genom att väcka intresse och idéer hos befintliga aktörer på marknaden.

    Författarna av denna rapport har tillämpat systematisk konceptframtagning för att skapa prototypen. Arbetsgången har gynnats av det strukturerade arbetssättet men har även krävt kreativt tänkande för att ge alla möjliga medel en chans att bidra till en optimal lösning. Resultatet blev en prototyp som till hög tillfredsställelsegrad kunde mäta och visa tydliga skillnader på olika sorters rullskidhjul.

    De utförda mätningarna visar en tydlig skillnad i rullmotstånd mellan de olika klasserna av rullskidhjul samt likheter mellan hjul inom samma klass. Även en tendens till att hjul inom samma klass har något olika rullmotstånd kan urskiljas. Resultatet visar också att rullmotståndet är starkt beroende av hjulets temperatur, där en högre temperatur leder till mindre rullmotstånd, men även beror på faktorer som pålagd last och hastighet.

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  • 202.
    Khoshnevis, Mahan
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Lindberg, Emilia
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Development of a Demonstrator in the Aerospace Industry for Visualization of 3D Work Instructions2015Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This master thesis was performed at the business area of Aeronautics at Saab AB in collaboration with Linköping University during the spring of 2015.

    In a complex product development environment, having knowledge about different processes is advantageous for efficiency. Model Based Definition (MBD) is a product development process where a 3D-model is the main source of information and the same 3D-model is applied all the way from design to production. In assembly, the operator follows work instructions where the 3D-model, and its requirements, is visualized. The model is always updated to the latest version and no 2D-drawings are needed. Saab applied MBD during the development of the new generation of the fighter aircraft JAS 39 Gripen. This change, from previously 2D to 3D, has caused that both internal and external people have minor knowledge about the new developing process of MBD.

    The purpose of the thesis was to develop a demonstrator acting as an educational environment to share knowledge about the MBD-process and the 3D work instructions. New methods and processes could be tested and evaluated in the demonstrator before implementing into the real product development process.

    By following and developing an interdependent and iterative product development process, this work has visualized the MBD-process. Designing and developing a demonstrator, using the same tools as in the real product development process, accomplished this. This thesis has developed a demonstrator that includes the main components of a physical model with corresponding 3D work instructions and a conceptual layout. A physical Lego model of Gripen provides a flexible and interesting way of sharing knowledge to the user who interacts with the demonstrator. The 3D work instructions were created in a way so that the user can assemble and interact with the same expressions and terms in order to get an understanding about how they are used. The educational aspect is important where simplifications and additional notes to the instructions help to get a better understanding. Depending on who the user is, different levels of preparations are needed. The recognition factor is important to a user with experience of MBD; it needs to be able to understand how different terms and requirements are used in the development process.

    The future work is about setting up the demonstrator and conduct usability tests to evaluate, modify and implement more details. Using a demonstrator in this purpose can be helpful for evaluating different techniques, methods or systems and reduce the errors in the product development process. It can also encourage people to a new enjoyable way of learning.

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  • 203.
    Knudson, Dean
    et al.
    North Dakota State University, USA.
    Kalafatis, Stavros
    Texas A and M University, USA.
    Kleiner, Carsten
    Hochschule Hannover, DEU.
    Zahos, Stephen
    University of Illinois at Urbana-Champaign, USA.
    Seegebarth, Barbara
    Technische Universitat Braunschweig, DEU.
    Detterfelt, Jonas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Avazpour, Iman
    Deakin University, AUS.
    Sandahl, Kristian
    Linköpings universitet, Institutionen för datavetenskap, Programvara och system. Linköpings universitet, Tekniska fakulteten.
    Golder, Peter
    University of Colorado at Colorado Springs, USA.
    Ginige, Jeewani Anupama
    Western Sydney University, AUS.
    Radermacher, Alex
    North Dakota State University, USA.
    Caballero, Hugo
    Universidad del Norte, COL.
    Gomez, Humberto
    Universidad del Norte, COL.
    Roos, Mikael
    Blekinge Tekniska Högskola, Sweden.
    Global software engineering experience through international capstone project exchanges2018Ingår i: Proceedings - International Conference on Software Engineering, New York: ACM Digital Library, 2018, s. 54-58Konferensbidrag (Refereegranskat)
    Abstract [en]

    Today it is very common for software systems to be built by teams located in more than one country. For example, a project team may be located in the US while the team lead resides in Sweden. How then should students be trained for this kind of work? Senior design or capstone projects offer students real-world hands-on experience but rarely while working internationally. One reason is that most instructors do not have international business contacts that allow them to find project sponsors in other countries. Another reason is the fear of having to invest a huge amount of time managing an international project. In this paper we present the general concepts related to "International Capstone Project Exchanges", the basic model behind the exchanges (student teams are led by an industry sponsor residing in a different country) and several alternate models that have been used in practice. We will give examples from projects in the US, Germany, Sweden, Australia, and Colombia. We have extended the model beyond software projects to include engineering projects as well as marketing, and journalism. We conclude with a description of an International Capstone Project Exchange website that we have developed to aid any university in establishing their own international project exchange.

  • 204.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Computational tools for aircraft system analysis and optimization2008Ingår i: 26th International Congress of the Aeronautical Sciences,2008, 2008Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    In this paper a model based QFD (MB-QFD) is introduced, and the different representations for design analysis of complex systems are discussed. Sensitivity analysis is a useful tool for trade studies and to  achieve an overview of the importance of different aspects of the design. The introduction of an hierarchical aggregated design influence matrix greatly improves the ability to handle large systems. Also an influence matrix of uncertainties is used to trace the impact of uncertainties in the design and to identify hot spots where more effort is needed. Through the QFD "House of quality" it is possible to formulate design objective function in a formal way. Furthermore, functional correlation can be used to analyse coherent and conflicting requirements, and by studying the influence of design parameters on the design objective the most  influential parameters can be selected for optimization. These tools are demonstrated on an aircraft design example.

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  • 205.
    Krus, Petter
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Distributed Modelling Techniques for System Simulation2008Rapport (Övrigt vetenskapligt)
  • 206.
    Krus, Petter
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Engineering Design Analysis and Synthesis2008Rapport (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

      

  • 207.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Robust Modelling Using Bi-Lateral Delay Lines for Real Time and Faster Than Real Time System Simulation2010Ingår i: ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, DETC2009: Volume 2, The American Society of Mechanical Engineers (ASME) , 2010, Vol. 2, nr PART A, s. 131-138Konferensbidrag (Refereegranskat)
    Abstract [en]

    A very suitable method for modelling and simulation of large complex dynamic systems is represented by distributed modelling using transmission line elements (or bi-lateral delay lines). This method evolves naturally for calculation of pressures when hydraulic pipelines are modelled with distributed parameters. It is also applicable to other physical systems, such as mechanical, electrical, gas etc. One interesting application for distributed solvers using bi-lateral delay lines is in real time simulation. Modelling for real-time applications puts special requirements on robustness in the numerical methods used. In real-time applications there is no room for decreasing time step in numerically critical stages. Furthermore, if a system is relaying on a real-time simulation for its functionality, failure in the numerical properties is unacceptable. It is also in many applications possible to simulate the system faster than real time, which means that high fidelity system simulation can be used to plan ahead in control applications, and for simulation based optimisation. Copyright © 2009 by ASME.

  • 208.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Whole Mission Simulation for Aircraft System Design2009Ingår i: AST 2009 Workshop on Aviation System Technology, 2009Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Developments in computational hardware and simulation software have come to apoint where it is possible to use whole mission simulation in the preliminary design.This paper address some key issues needed to realize this. These are, systemsimulation using distributed solvers for robust large scale simulation, time scalecompression to deal with the widely different time scales involved, e.g. the transientbehaviour of control surface actuators, to the tracking of fuel consumption. Theapplication is a flight simulation model with subsystems such as control surfaceactuators. In this way it is possible to do real time simulation (RTS) and faster thanreal time simulation (FRTS) of rather complex systems.

  • 209.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Whole Mission Simulation for Aircraft System Design and Optimisation2009Ingår i: CEAS 2009 European Air & Space Conference CEAS 2009 European Air & Space Conference / [ed] Mike Steeden, London: Royal Aeronautical Society , 2009Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Developments in computational hardware and simulation software have come to a point where it is possible to use whole mission simulation in the preliminary design.  This paper address some key issues needed to realize this. These are, system simulation using distributed solvers for robust large scale simulation, time scale compression to deal with the widely different time scales involved, e.g. the transient behaviour of control surface actuators, to the tracking of fuel consumption. The application is a flight simulation model with subsystems such as control surface actuators. In this way it is possible to do real time simulation (RTS) and faster than real time simulation (FRTS) of rather complex systems.

    Using such models it is possible to do design analysis, e.g sensitivity analysis and trade of analysis, as well as design optimisation, In this paper this is demonstrated on a flight simulation model with subsystems, such as control surface actuators.

  • 210.
    Krus, Petter
    et al.
    Linköpings universitet, Institutionen för systemteknik, Reglerteknik. Linköpings universitet, Tekniska högskolan.
    Gunnarsson, Svante
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Adaptive Control with Impact Detection of a Hydraulic Actuator Connected to a Flexible Mechanical Structure1995Rapport (Övrigt vetenskapligt)
  • 211.
    Krus, Petter
    et al.
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Maskinkonstruktion.
    Ölvander, Johan
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    An Information Theoretical Perspective on Design Optimizartion2004Ingår i: 2004 DETC:Design Engineering Technical Conference,2004, 2004Konferensbidrag (Refereegranskat)
  • 212.
    Krus, Petter
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Performance index and meta-optimization of a direct search optimization method2013Ingår i: Engineering optimization (Print), ISSN 0305-215X, E-ISSN 1029-0273, Vol. 45, nr 10, s. 1167-1185Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Design optimization is becoming an increasingly important tool for design, often using simulation as part of the evaluation of the objective function. A measure of the efficiency of an optimization algorithm is of great importance when comparing methods. The main contribution of this article is the introduction of a singular performance criterion, the entropy rate index based on Shannon's information theory, taking both reliability and rate of convergence into account. It can also be used to characterize the difficulty of different optimization problems. Such a performance criterion can also be used for optimization of the optimization algorithms itself. In this article the Complex-RF optimization method is described and its performance evaluated and optimized using the established performance criterion. Finally, in order to be able to predict the resources needed for optimization an objective function temperament factor is defined that indicates the degree of difficulty of the objective function.

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  • 213.
    Kucuksayrac, Elif
    et al.
    Istanbul Technical University, Turkey; Delft University of Technology, The Netherlands.
    Wever, Renee
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten. Delft University of Technology, The Netherlands.
    Brezet, Han
    Aalborg University, Denmark; Delft University of Technology, The Netherlands.
    Universities’ intermediary role in the “design for sustainability” field: Case studies from the Netherlands and Turkey2017Ingår i: International Journal of Sustainability in Higher Education, ISSN 1467-6370, E-ISSN 1758-6739, Vol. 18, nr 3, s. 455-472Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose – This paper aims to investigate the intermediary role of universities in spreading design for

    sustainability into industry.

    Design/methodology/approach – Three case studies were undertaken on Delft University of Technology, Design for Sustainability Program from The Netherlands; a center on sustainable consumption and production; and Prof. Göksel Demirer from Middle East Technical University, Environmental Engineering Department from Turkey.

    Findings – The process and evolution of the intermediary roles of the cases are explained. Three types of structures, through which universities undertake intermediary role, are investigated via the cases studies, a program, a center and an individual scientist.

    Originality/value – This study is a first attempt to investigate the intermediary role of universities in the design for sustainability field. 

  • 214.
    Kurdve, Martin
    et al.
    Mälardalen University.
    Henriksson, Fredrik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Wiktorsson, Magnus
    Mälardalen University, Eskilstuna, Sweden.
    Denzler, Patrick
    Mälardalen University, Eskilstuna, Sweden.
    Zachrisson, Mats
    Swerea IVF, Mölndal, Sweden.
    Bjelkemyr, Marcus
    Mälardalen University, Eskilstuna, Sweden.
    Production system and material efficiency challenges for large scale introduction of complex materials2017Ingår i: Advanced Materials Proceedings, ISSN 2002-4428, Vol. 2, nr 8, s. 492-499Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper links production system research to advanced material research for the vehicle industry. Facilitated by need for reduction of fuel use, the automotive industry is pushing a radical change from using steel structures to new mixed materials structures. In production systems optimised for steel, the changes will affect productivity and material efficiency. Four industrial case studies focusing on production economy and productivity give implications of production technology demands on the material selection regarding new joining techniques and additive or forming methods which has to be investigated when considering new materials. Material efficiency analysis shows that minimising spill in production operations and regulatory demand of recycling need to be considered in material development, which implies both design for disassembly, advanced separation processes and use of recycled raw materials. To be successful in new material introduction, new information flows and knowledge sharing moving from operations and manufacturing development to materials development and design are needed. The material developers could use axiomatic design strategies to structure the production system demands on the materials. State of the art lightweight producers in vehicle and automotive industry are likely early adopters to advanced lightweight structures with need of information flows between material development and operations.

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    Production system and material efficiency challenges for large scale introduction of complex materials
  • 215.
    Landin, Tore
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Nilsson, Jesper
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Förbättring av sidostabilitet på såbill2019Självständigt arbete på grundnivå (högskoleexamen), 10,5 poäng / 16 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This report presents the work on improving the lateral stability of the seed coulters of Väderstad seed drill model Spirit. The work lasted ten weeks and was carried out at Väderstad AB spring 2019. The basic problem was analyzed with a number of different methods, and tests were carried out both in the field and in the test rig. With the results from these, it was found that the suspension of the seed coulters allowed both torsional and lateral movements at low loads. 

     The work started with a root cause analysis which was then used to produce a requirement specification. This was then used to develop concepts. After evaluation, the best concepts were selected, analyzed, modeled and calculated. When the concepts were deemed to be sufficiently functional, several manufacturing analyses were made to assess the suitability for serial production. 

     Three concepts were developed. One is a final concept that can be mounted directly on existing machines in the form of injection-molded plastic blocks on the seed coulters. One is a concept for future year models were flanges are mounted on the fall of the seed coulters. This concept is available in two parts, either in the form of a welded steel profile or as part of a sand cast reconstruction of the seed coulters. The third and final concept is a reconstruction of the machine's seed coulters with a spring to control the bill pressure. In addition, a method for evaluating the side stability of the seed coulters has been developed. 

     The reason for the Nordic model's problems is that the seed coulters tend to track the grooves of the fertilizer carriers. This can be solved by having the seed coulters support each other in the lateral direction. 

     As a continued work, a more thorough examination of the sand cast flange concept is recommended. This is in line with Väderstad's philosophy of making built to last products. 

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  • 216. Lantto, B.
    et al.
    Ellström, H.
    Gavel, Hampus
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Jarelande, M.
    Steinkellner, Sören
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska högskolan.
    Järlestål, A.
    Landberg, M.
    Modeling and Simulation of Gripen’s Fluid Power Systems2004Ingår i: Recent advances in aerospace actuation systems and components, Toulouse, France, 2004Konferensbidrag (Refereegranskat)
  • 217.
    Larsson, Elin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Design och produktionsanpassning av undervattensfarkost2014Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Vid årsskiftet 2013-2014 lanserade Ocean Robotics International en undervattensfarkost med främsta syfte att filma och samla in data under ytan. För att farkosten ska kunna operera tyngdlöst i vattnet används ett flytmaterial vars utformning uppnår väldigt höga tillverkningskostnader. Därför finns det efterfrågan ifrån företaget att utveckla en farkost bättre anpassad för produktion, för att på så sätt möjliggöra minskade produktionskostnader.  Dessutom har företagets huvudsakliga kunder angett nya krav och önskemål på produkten, som kräver ett nytt utförande på farkosten för att uppnå kravuppfyllelse. Syftet med detta arbete är att göra en vidareutveckling av undervattensfarkosten som uppfyller nya krav och önskemål, samt är produktionsanpassad. Målet är att ta fram produktionsunderlag till den framtagna farkosten.

    Arbetet följde en generell, etablerad produktutvecklingsmodell av Ulrich och Eppinger (2008), som innefattade upprätthållande av en kravspecifikation, en konceptgeneringsfas med kombinerade strukturerade och fria metoder samt konceptval. Arbetsmodellen kompletterades med DFMA (Design for Manufacturing and Assembly); teori kring hur produkter kan tas fram för att anpassas för produktion.

    I arbetet undersöktes olika sätt att skapa flytkraft varvid de flesta tekniker bygger på principen inkapslad luft. På 3000 meters djup, som farkosten är utformad att operera på, är trycket ungefär 300 gånger atmosfärstrycket. Detta skapar problem för många sådana konstellationer på grund av den höga tryckskillnad som bildas mellan den inkapslade luften och det omgivande vattnet. Därför föll valet på syntaktiskt skum som företaget använder sedan tidigare, ett material med lägre densitet än vatten och som därmed avger flytkraft. Materialet är väl lämpat för avsett djup. Stabilitet i farkosten är ytterligare en faktor som är av viktigt att ta hänsyn till vid utformning, eftersom det starkt påverkar hur enkel den är att operera med. Rätt förutsättningar fås av när flytmaterial är väl utspritt i farkosten, stora avstånd mellan motorerna och farkostens form då en avlång konstruktion är att föredra. En långsmal farkost med avrundade kanter ger även fördelar i strömningsförmåga.

    Arbetet resulterade i ett koncept i detaljutförande och produktionsunderlag. För att uppfylla de nya kraven är farkosten större än föregående modell. Formerna på flytblocken är kraftigt förenklade för att på så sätt undvika maskinbearbetning som är en kostsam process. Där det är önskvärt med dubbelkrökta ytor har dessa istället skapats med hjälp av kåpa bestående av glasfiber, som tillverkas genom kompositlaminering som är en metod väl lämpad för att skapa organiska former.

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  • 218.
    Larsson, Emma
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Nilsson, Maja
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Towards sustainable sanitation in slum areas: A field study in Mumbai2013Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Globally, there are 2.5 billion people who do not have access to improved sanitation. One third of these people are living in India. Bad sanitation is both undignified and causes the spread of diseases like diarrhoea. It is a large challenge to handle the problematic situation with sanitation, especially in urban areas. Sustainable sanitary systems that are energy self-sufficient and do not require sewage system are needed. There are new techniques with this in mind that are under development.

    The aim of this thesis is to investigate the possibilities to implement a sustainable sanitary system in slum areas of Mumbai. The chosen area and existing sanitary techniques is investigated in the literature study. To understand the user requirements and their living situation, a field study is performed in slum areas of Mumbai. Interviews are held with experts from organisations working with the sanitary situation in the area to get a deeper understanding about their experiences. The sanitary situation today is not well functioning, a new way of solving the problem is needed and it has to happen soon.

    Through an analysis of the empirical findings, three different sanitary situations are presented. It is important that each area is investigated to identify what situation there is, before building new sanitary facilities. To achieve a more sustainable sanitation, one system for each of the three situations should be developed. Requirements for each of the situations are presented and they all have two things in common, the toilet is shared between a determined amount of people and the user has the responsibility for the maintenance.

    From a cross mapping between the investigated sanitary techniques and the requirements for the three situations, it is clarified what techniques that are suitable in which context. No one of the investigated techniques is a perfect match and further development is needed. One of the sanitary situations is taken further through concept development. The concepts are compared against the requirements to identify the best concept. The best concept with modifications is visualised to exemplify how it may be designed. In the comparison between the requirements and concepts, gaps in the design and issues for further development are identified.

    The core of this master thesis is to emphasise the importance of having a holistic approach concerning the sanitary situation. It is important that new techniques are being developed with a close connection to the users and the specific environment. By investing money in more sustainable systems, the situation for the slum residents in Mumbai can be improved and at the same time contribute to a more sustainable society.

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  • 219.
    Larsson, Heléna
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Omkonstruktion av avtappningens inloppsrör på utloppsdiffusorn på SGT-8002011Självständigt arbete på grundnivå (högskoleexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Detta examensarbete har gått ut på att finna en ny konstruktionslösning på uttlopps-diffusorns inloppsrör på gasturbin SGT-800. Arbetet har utförts på Siemens Industrial Turbomachinery AB i Finspång på avdelning RCTD (gasturbinkonstruktion).

    Målet med projektet har varit att ta fram en konstruktionslösning som underlättar för svetsmontörerna på site när det gäller installation av inloppsrören, samt reducerar monteringstiden. Målet har även varit att ta fram en kostnadsjämförelse för totalkostnaden mellan den nya och originalkonstruktionen.

    Den metodik som har använts till detta arbete är Voice of the customer samt Systematisk konceptutveckling som baseras på bl.a. Vladimir Hubkas princip. Även original-konstruktionen har undersökts via ritningar och bilder tagna från tidigare sitemontage.

    Originalkonstruktionen skickas idag till site omonterad tillsammans med utlopps-diffusorn direkt från SIT AB:s underleverantör KSG AB i Surte för att sedan monteras och svetsas fast på site. P.g.a. att inloppsröret måste monteras i vinkel samt att utloppsdiffusorn är rund till formen, måste svetsning idag ske med elliptisk hålpassning. Detta leder till att det är svårt att få rör och hål att passa ihop utan att modifieringar måste göras på något av dessa.

    Via intervjuer och brainstorming skapades 17 olika koncept, varav nio togs vidare för utvärdering med hjälp av de kundkriterier som tagits fram. Denna utvärdering resulterade i att sex koncept gick vidare till ytterligare en utvärdering, där slutligen tre koncept plockades bort. Genom jämförelse mellan de tre kvarvarande koncepten, valdes slutligen ett vinnande koncept.

    Det nya konceptet består av två rördelar där det övre röret har samma innerdiameter som det nedre rörets ytterdiameter. Detta ger montörerna möjligheten att justera rörets höjd och dess vinkelpassning till den bälg som sammankopplar inloppsröret med avtappningsröret. Den övre rördelen har svetsats fast på utloppsdiffusorn före transporteringen till site. För att montera ihop dessa rör krävs det att de svetsas ihop. Detta var ett monteringssätt som montörerna ville undgå. Dock har detta lösts genom att kapa de båda rördelarna så att passning och svetsning sker på runda mynningar. Det kommer även med största sannolikhet finnas möjligheter att minska rörets diameter, vilket minskar rörets totala vikt.

    Den nya lösningen kommer uppskattningsvis att reducera installationstiden på site med upp till 60 % jämfört med originalkonstruktionen. Detta kommer att ge en installationskostnad proportionellt minskad mot installationstiden. Det övre rörets installationsbehov före sitetransport kommer att generera en tillverkningskostnad som uppskattningsvis förblir densamma som för originalkonstruktionen. Den totala kostnaden för den nya konstruktionen kommer att minskas med ca 45 % jämfört med originalrören.

    Förhoppningen är att detta projekt genererat ett intresse hos SIT AB att gå vidare och göra en konstruktionsförändring på denna komponent, för att underlätta vid framtida montage.

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  • 220.
    Lind, Ingela
    et al.
    Linköpings universitet, Institutionen för systemteknik, Reglerteknik. Linköpings universitet, Tekniska högskolan.
    Andersson, Henric
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Model Based Systems Engineering for Aircraft Systems – How does Modelica Based Tools Fit?2011Ingår i: Proceedings of the 8th International Modelica Conference, March 20th-22nd, Technical Univeristy, Dresden, Germany / [ed] Clauß, Christoph, Linköping: Linköping University Electronic Press, 2011, s. 856-864Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Saab Aeronautics has chosen Modelica and Dymola as part of the means for model based system engineering (MBSE). This paper will point out why a considerable effort has been made to migrate models from other simulation tools to Dymola. The paper also shows how the models and tools are used, experiences gained from usage in an industrial context as well as some remaining trouble spots.

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    Model Based Systems Engineering for Aircraft Systems – How does Modelica Based Tools Fit?
  • 221.
    Lindahl, Mattias
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik.
    Sakao, Tomohiko
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell miljöteknik.
    Hallberg, Peter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Innovative Customized Offering Design2013Rapport (Övrigt vetenskapligt)
  • 222.
    Lindbom, Erik
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Anordning för rengöring avkomponent i mjölkningsrobot: Framtagning av lösning för förbättrad rengöring avspentvättkopp för att motverka bakterietillväxt2017Självständigt arbete på grundnivå (kandidatexamen), 10,5 poäng / 16 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Denna rapport behandlar problemet med att en ny version av spentvättkopp på både dagens och framtida VMS (Volontary milking system) inte görs rent ordentligt. Syftet med projektet var att ta fram en lösning som låter hela spentvättkoppen göras rent när den inte används. Den färdiga versionen ska kunna testas ingående i en verklig miljo på olika generationer av VMS:er. Syftet med detär att kontrollera att lösningen klarar av långvarigt bruk och att göra en jämförelse för att se om mängden bakterier minskar. Ytterligare ett syfte var att göra prototypen lätt att montera utan att behöva modiera den existerande maskinen. Resultatet blev tre varianter på grund av olika designval på tidigare versioner. 

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    TQMT11 Examensrappport av Erik Lindbom
  • 223.
    Lindell, Josefin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Konceptframtagning på ett bord och stolar för Compact Living boende2013Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Utifrån ett identifierat problem av produktutvecklingsföretaget Prodelox har de tagit fram ett examensarbete med syfte att utveckla ett koncept på ett bord och stol. Bordet ska kunna fällas ut från väggen och bakom ska det rymmas fyra stolar. I uppfällt läge ska bordet ha en extra funktion, den ska ha ett estetiskt värde. Examensarbetet ämnar ta fram olika idéer och lösningar på bord och stolar för att sedan välja ut ett koncept. Idén med ett bord på väggen med stolar integrerade grundar sig i dagens samhälle. Allt fler bor på en liten yta av olika orsaker vilket kan leda till att boendet blir väldigt trångt. Compact Living är ett begrepp inom inredning som syftar på att effektivisera boendet utan att hemtrevnaden blir lidande för bostadens yta. Ur ett Compact Living perspektiv och dagens trender har olika kreativa koncept tagits fram. Rapporten tar upp och sammanfattar Compact Living och trender som tas till hänsyn under utvecklingsarbetet.

    Projektet följer de tidigare stegen i en metodik utvecklad av Ulrich & Eppinger (2004). Koncept utvecklas genom framtagande av kravspecifikation, konceptgenerering och vidareutveckling.

    Konceptutvecklingen resulterade i sju olika bordkoncept och åtta olika stolkoncept. Utav dessa koncept väljs två bordkoncept och två stolkoncept ut för fortsatt arbete. Utifrån det fortsatta arbetet väljs ett bord, där benen ligger bakom bordsskivan och en stol, som är en ihopsatt stol av plywoodsskivor, för vidare arbete. Ur en trendanalys som gjordes togs ett formgivningskoncept fram. Detta formgivningskoncept grundar sig i trenden Retro som identifierades som den minst representerad trenden på marknaden. Resultatet blev ett bord och en stol gjort i plywood och med teak som ytterfaner. Aluminiumdetaljer vid rotationspunkter samt konformiga ben och stolsram. Tre dekorativa förslag av tavelmotiv togs fram utifrån en enkätundersökning som gjordes. Första förslaget är att bordsskivan/tavlan fräses ut i ett mönster eller kontur och ersätts med ett annat material, förslag två är att hela skivan fräses ut och ersätts av en glasskiva över en plansch och det sista förslaget är en armatur.

    Resultatet blev ett bord som sitter fast i väggen. Det fälls ut underifrån och i utfällt läge kan stolarna lätt plockas fram och användas. Bordet är inte mer än en decimeter djupt i uppfällt läge och stolens och bordets mått är tagna utifrån standarder och riktlinjer på bord och stolar för att det ska kunna användas av de flesta personerna. Förslag 1 på tavla är att bordskivan kommer att ha en bild på en kontur eller mönster urfräst i bordskivan och fyllas med antingen aluminium eller annat material. Förslag 2 är att ur bordskivan fräses en större yta ut där ett valt motiv kan placeras under en glasskiva. Det sista förslaget, förslag tre är en lampa som i uppfällt läge kan lysas upp.

    För vidare arbete på detta projekt föreslås det att designmodeller och prototyper görs för att undersöka hur gångbart konceptet är. För att undersöka hur bra konceptet är bör både stolens och bordets hållfasthet beräknas mer genomgående för att därefter ta fram produktionsunderlag.

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  • 224.
    Lindholm, Jim
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Is Design Automation a Feasible Tool for Improving Efficiency in Production Planning and Manufacturing Processes?2018Ingår i: Proceedings of the 8th Swedish Production Symposium (SPS 2018), Elsevier, 2018, Vol. 25, s. 8s. 194-201Konferensbidrag (Refereegranskat)
    Abstract [en]

    The production planning is a repetitive process that demands engineering hours and expertise. Many parameters must be considered, and inefficiencies lead to increased lead times. The hypothesis is that valuable time within the manufacturing stages can be saved through improved engineering tools. This article will explore to possibilities to increase the utilization of digital tools to support the engineers in their production planning activities, and to improve the efficiency of manufacturing processes. Through study visits and interviews at a product owning company with manufacturing in-house, proposals for areas that could be improved with design automation will be presented.

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  • 225.
    Lindwall, Victor
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    The application of Micro Perforation theory onto Volvo Cars's Air Induction Systems: Implementation and Manufacturing of Micro Perforated Silencers at Volvo Cars in Gothenburg2017Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Downsizing in cars lead to higher noise emissions through the addition of turbo-/superchargers. These noise emissions must be counteracted and cancelled in order to contribute to the overall quality feel of a car. This project follows a product development method in order to research if a new type of silencers are applicable in air induction systems in order to dampen noise emissions. The project also cover how to manufacture the new type of silencers, traditionally used as acoustic insulation in offices.

    The project covered everything from literature review on silencers, noise regulations, downsizing and traditional plastic manufacturing methods. After the analysis of the results, it stood clear that the new silencers are more effective than conventional solutions. A manufacturing process was also determined, which needs further research in order to derive what the manufacturing cost would be. The project resulted in strong indicators that the new silencers are promising but also opened up to new research questions.

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    The application of Micro Perforation theory onto Volvo Cars’s Air Induction Systems
  • 226.
    Lokman, Anitawati
    et al.
    Universiti Teknologi MARA, Shah Alam, Malaysia.
    Schütte, SimonLinköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Proceedings KEER2018, Go Green with Emotion: 7th International Conference on Kansei Engineering & Emotion Research 2018, 19-22 March 2018, Kuching, Malaysia2018Proceedings (redaktörskap) (Refereegranskat)
    Abstract [en]

    The KEER 2018 is the 7th event in a Conference Series held under the auspices of theJapan Society of Kansei Engineering (JSKE), theTaiwan Institute of Kansei (TIK), and theEuropean Kansei Group (EKG).Malaysia Association of Kansei Engineering (MAKE) is the local organizer of this conference, strongly supported by Research Interest Group of Kansei / Affective Engineering (RIG KAE), Universiti Teknologi MARA (UiTM), UiTM Sarawak, Sarawak Convention Bureau (SCB), Malaysia Convention & Exhibition Bureau (MyCEB), Ministry of Higher Education (MoHE), and Kolej Univeristi Poly-Tech MARA. KEER 2018 will be held in Kuching Sarawak, Malaysia. KEER 2018 conference theme is “Go Green with Emotion” reflecting the growing spectrum in green design and technology through Kansei and Emotion approach towards sustainable economy, society, lifestyle and nature.​

    Emotion is the new fashion! KEER 2018 provides a platform for everyone to gather, share, and learn how Kansei is related to emotion, and how Kansei Engineering is used to engineer emotion, what more, in the land of Orang Utan and Rafflessia. KEER  2018 is inviting authors from multidisciplinary fields to submit high quality and unpublished papers. Submissions are focused on human experience with topics related, but not limited, to Kansei and Emotion. KEER 2018 also provides a platform for researchers, innovators, academicians, practitioners, and other interested parties from diverse culture, background, and expertise, to gather,learn, and share different viewpoints in a warm, rich and open-minded context.Join us in our keynote session, parallel session, workshop, poster session, video festival, and exhibition.

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    Proceedings KEER2018, Go Green with Emotion: 7th International Conference on Kansei Engineering & Emotion Research 2018, 19-22 March 2018, Kuching, Malaysia
  • 227.
    Lundberg, Anders
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Jansson, Tobias
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Preliminary study of a frame for a two module turbine system2011Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    The development of steam turbines is continuously moving forward and the aim is oftento develop configurations with higher power output. Siemens Industrial Turbomachinery AB is currently in the beginning of a development project which replaces a single turbine with two interconnected turbines with higher pressure and temperature of the steam than before. To ensure reliable quality and hold down costs is it an advantage to do most of the assembly before delivery to site.This thesis work at Linköping University has been written in collaboration with Siemens Industrial Turbomachinery AB, Finspång. The objective of this work is to investigate the possibility to mount two turbines and a gearbox on a turbine frame. Theframe will be used both for transportation and during operation.The thesis considerate analyses of the turbine layout and critical parameters that may affect a turbine frame. In addition was a frame concept developed and evaluated with respect to solid mechanics and alignment of the shaft arrangement.Our conclusion is that there are good possibilities to install the equipment on a frame and achieve demands due to solid mechanics and alignment of the shaft arrangement.We recommend Siemens Industrial Turbomachinery AB to carry on with the project and do further investigations of the natural frequency of the frame concept, compare financial advantages and disadvantages together with possibilities for transportation.

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    fulltext
  • 228.
    Lundström, David
    et al.
    Linköpings universitet, Institutionen för datavetenskap, AUTTEK - Autonomous Unmanned Aerial Vehicle Research Group. Linköpings universitet, Tekniska högskolan.
    Amadori, Kristian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    RAVEN - A Subscale Radio Controlled Business Jet Demonstrator2008Ingår i: proceedings from the ICAS 2008, CD-ROM, Anchorage: International Council of the Aeronautical Sciences, (ICAS) , 2008Konferensbidrag (Refereegranskat)
    Abstract [en]

    A dynamically scaled model of a Business-Jet has been build and is undergoing testing at Linköping University. The goal of the project was to understand the difficutlties of dynamic scaling and how to extract useful data from subscale flight testing. This paper presents the experience made during the projects up to the time of writing, and includes details from manufacturing, ground testing equipment such as car top testing, in flight data acquisition system design and preparation for the fligt testing.

  • 229.
    Lundström, David
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Amadori, Kristian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Automation of Design and Prototyping of Micro Aerial Vehicle2009Konferensbidrag (Refereegranskat)
    Abstract [en]

    The presented work is centered on the automation of the design process of Micro or MiniAerial Vehicles (MAV). A design optimization framework that links together a CAD systemfor airframe design and a panel code for aerodynamic evaluations has been developed. Thispaper is based on research and results previously published by the research team. Itdescribes the experiences made so far, and demonstrates with a case study, how fullyautomated design is indeed possible. The user is required to enter the initial requirementsinto the system that will then optimize the MAV design. Both the geometry and thepropulsion system are taken into account. Finally, a 3D printer is used for manufacturing ofthe aircraft. The optimization comprises both discrete and continuous variables. Validationof common propulsion system models is also presented.

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    Orlando2009_629
  • 230.
    Lundström, David
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Amadori, Kristian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Distributed Framework for Micro Aerial Vehicle Design Automation2008Ingår i: Proceedings from the 46th AIAA Aerospace Sciences Meeting and Exhibit, 7 - 10 January, Reno, NV, USA, AIAA , 2008, s. 140-Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Micro or mini aerial vehicles are characterized by being simple and inexpensive to build, and due to their small size very important to optimize. They are also likely to be built in relatively small series and be tailored for the sensors and equipment available at the time of deployment. Therefore "design and build on demand" is very attractive, where a modular concept with a more or less automated design process is desirable. In this paper design automation of a Micro or Mini Aerial Vehicle (MAV) is demonstrated using a distributed design optimization framework that involves selections of components from a database of propulsion system equipment and geometrical shape optimization. The framework links together a CAD system, responsible for the aircraft shape generation, with a panel code for aerodynamic evaluations.

     

  • 231.
    Lundström, David
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Amadori, Kristian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan.
    Validation of Models for Small Scale Electric Propulsion Systems2010Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    At Linköping University work has been carried out towards having an automated designand manufacturing process of Micro Air Vehicles (MAV). A dedicated design optimizationframework has been developed. Initial experience has shown that choosing the rightpropulsion system has a major relevance on the overall performance of the aircraft. Thusthe correctness and fidelity of the models used to describe each component of the propulsionsystem are matters of great importance. With this knowledge an effort has been made tovalidate the propulsion system’s models. Using a specifically designed test rig a number ofdifferent motors and motor controllers have been tested. The motor model has shown goodcorrelation with test data, although manufacturer’s specifications have proven less reliable.Motor controller characteristics has shown to be complex and difficult to model.

  • 232.
    Lundström, David
    et al.
    Linköpings universitet, Institutionen för datavetenskap, AUTTEK - Autonomous Unmanned Aerial Vehicle Research Group. Linköpings universitet, Tekniska högskolan.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Micro Aerial Vehicle Design Optimization using Mixed Discrete and Continuous Variables2006Ingår i: A collection of technical papers : 11th AIAAA/ISSMO Multidisciplinary Analysis and Optimization Conferences, Reston, Virginia, USA: American Institute of Aeronautics and Astronautics, 2006, s. 1277-1290Konferensbidrag (Refereegranskat)
    Abstract [en]

     Micro or mini aerial vehicles are characterized by the fact that they are likely to be build in relatively low numbers for the sensors and equipment available at the time of deployment. Therefore "design and build on demand" is very attractive, where a modular concept with a more or less automated design process is desirable. In this paper design automation of a Micro or Mini Aerial Vehicle (MAV) is demonstrated using design optimization with both discrete and continuous variables. This involves both selections of components for the propulsion system, as well as geometrical parameters for the airframe.

  • 233.
    Lundén Johansson, Björn
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Pettersson, Marcus
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Ölvander (Andersson), Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    A Component Based Optimization Approach for Robot Modular Design2007Ingår i: Proceedings of DETC'2007 ASME Design Automation Conference, September, Las Vegas, Nevada, USA, 2007Konferensbidrag (Övrigt vetenskapligt)
  • 234.
    Luu, ViChi
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Methodology development for parametric CAD modeling in CATIA V5 to aid simulation driven design using turbine volute as a case study2015Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    This report is the documentation of a master’s thesis which was conducted at Scania CV AB in Södertälje. In this study, the benefits, challenges and conditions of using parametric CAD-models for aiding CFD-simulations and performance-optimization in the product development within internal combustion engines have been assessed. The goal of the thesis included developing and proposing a methodology for design engineers at Scania which will aid them in creating parametric CAD-models which are robust, flexible, comprehensible and intelligent. The study also included assessing the benefits and pre-requisites of such methodology with both practical and theoretical approaches. The ultimate goal of this entire study was to create value for the organization by reducing lead-time in the design process while promoting the production of high quality products.

    A case-based approach was applied in the study in which modeling strategies resulting from practical investigations and analyzing existing methodologies were implemented on a CAD-model representing the gas-volume of a turbine volute. The chosen strategies were evaluated and subsequently documented as a part of the methodology or discarded depending on its support for the parameterization. The final methodology itself was evaluated based on the quality of the parameterized CAD-model, the time required to create the model and its compatibility to the present design process at Scania CV AB. Finally the methodology was discussed with respect to the different evaluations, and the defined research questions were discussed and answered. The results of the thesis revealed that if parametric CAD-models are made in a structured, standardized and conscious manner, they are able to be highly robust and flexible which gives the models the ability to assume a big set of different forms. The methodology is recommended to be tested in a pilot project and be implemented through internal courses at the company.

    It was concluded that a methodology which aids the design engineers in creating parametric CAD-models will be the key towards implementing parametric CAD-models in the company and also enabling the many benefits of parameterization, which includes reduced lead-time, enhanced component performance, increased knowledge about the component, and promotion of collaboration among engineers. It was also concluded that parametric models are best suited when the existing design freedom is big and when the time permits performance analyses via optimizations, while challenges include ensuring that the model is parameterized correctly with respect to the CFD-engineers’ wishes while taking into account the requirements from other disciplines. Therefore it is very important to establish a communication between the different engineers. Ultimately, when parametric models are established in the organization, they are recommended to be implemented eventually in both short-term and long-term projects within Scania for its beneficial properties.

    Ladda ner fulltext (pdf)
    ViChiLuuThesis
  • 235.
    Lövgren, Sebastian
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Norberg, Emil
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanik.
    Topology Optimization of Vehicle Body Structure for Improved Ride & Handling2011Självständigt arbete på avancerad nivå (magisterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Ride and handling are important areas for safety and improved vehicle control during driving. To meet the demands on ride and handling a number of measures can be taken. This master thesis work has focused on the early design phase. At the early phases of design, the level of details is low and the design freedom is big. By introducing a tool to support the early vehicle body design, the potential of finding more efficient structures increases. In this study, topology optimization of a vehicle front structure has been performed using OptiStruct by Altair Engineering. The objective has been to find the optimal topology of beams and rods to achieve high stiffness of the front structure for improved ride and handling. Based on topology optimization a proposal for a beam layout in the front structure area has been identified. A vital part of the project has been to describe how to use topology optimization as a tool in the design process. During the project different approaches has been studied to come from a large design space to a low weight architecture based on a beam-like structure. The different approaches will be described and our experience and recommendations will be presented. Also the general result of a topology-optimized architecture for vehicle body stiffness will be presented.

    Ladda ner fulltext (pdf)
    LIU-IEI-TEK-A--11/01158—SE
  • 236. Beställ onlineKöp publikationen >>
    Malm, Anna
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Technology Transfer within Related Offset Business: From an Aircraft Production Perspective2016Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    The aircraft industry is viewed as a prestigious industry by many countries. Emerging economies regard the establishment of aircraft production capabilities as contributing to their competitiveness and technological development. Therefore, in the defence aircraft industry, politics play a key role in competitiveness. Governments can strategically trade market access for technological development, often in the form of offset business. “Offset” is defined as an agreement in which a large system is bought and the seller assumes obligations that both benefit the buying nation and have long-term effects on the development of the buyer’s national industry. When the offset obligations are directly connected to the product or system sold, they are called “related offsets”. The realization of an offset agreement is in most cases including some form of technology transfer. Technology transfer is the transfer of technology from a sending company, to a receiving company, where it is implemented and adapted to use.

    The empirical data presented in this thesis were gathered through six in-depth studies performed at the unit for aircraft production at the Swedish company Saab. The findings from the studies are presented in six appended papers. The objective of this thesis is to extend the current understanding of technology transfer realization connected to related offsets within the defence aircraft industry. The research objective is fulfilled through the addressing of two research questions. The first research question aims to identify factors that can have a major effect on technology transfer realization in the research context. As an answer to the first research question. Following factors were identified: Capability gaps, Knowledge transfer, The purpose of related offset business, Seller’s fulfilment of offset obligations before contract termination, Related offset business include hierarchical levels, Related offset work package identification to meet the buyer’s request, and Assessment of the receiver in two steps, and finally Cultural and communication challenges.

    These factors set the basis for research question two. The second research question addresses how to manage future related offset technology transfer realization connected to aircraft production. As an answer to the second research question, a structured related offset process and facilitation tools for managing capability gaps between the sending and the receiving company was presented. The purpose of the suggested structure is to maintain the link between the negotiated related offset agreements and the employees, working to achieve the agreement within the realization of the technology transfer.

    Delarbeten
    1. Cross-cultural communication challenges within international transfer of aircraft production
    Öppna denna publikation i ny flik eller fönster >>Cross-cultural communication challenges within international transfer of aircraft production
    2011 (Engelska)Ingår i: Computer Supported Cooperative Work in Design (CSCWD), 2011, IEEE , 2011, s. 835-841Konferensbidrag, Publicerat paper (Refereegranskat)
    Abstract [en]

    The research within this paper identifies three main categories of cross-cultural communication challenges within international transfer of aircraft production. The first category is organizational structure, hierarchy and delegation of responsibility the second category is consensus behavior and avoidance of conflicts and the third category is individual motivation factors. Furthermore, the paper discusses the need for specific types of cross-cultural training that can be one solution for reducing the problems and difficulties that cultural challenges may induce. The case study indicates that it is important for Aeronautics, a Swedish enterprise, to apply organized cross-cultural training in combination with technical training. To secure the presence of cross-cultural training, suitable types of cultural training could be included in the working process/routine for how to conduct a production transfer.

    Ort, förlag, år, upplaga, sidor
    IEEE, 2011
    Nyckelord
    aircraft production, cross-cultural communication, cross-cultural training, cultural challenges, offset, outsourcing, transfer
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-89309 (URN)10.1109/CSCWD.2011.5960215 (DOI)978-1-4577-0386-7 (ISBN)
    Konferens
    15th International Conference on Computer Supported Cooperative Work in Design (CSCWD 2011), 8-9 June 2011, Lausanne, Switzerland
    Tillgänglig från: 2013-02-27 Skapad: 2013-02-25 Senast uppdaterad: 2016-11-09
    2. Exchange of tacit knowledge within advanced production with small batch sizes
    Öppna denna publikation i ny flik eller fönster >>Exchange of tacit knowledge within advanced production with small batch sizes
    2013 (Engelska)Ingår i: Received wisdom, kernels of truth, and boundary conditions in organizational studies / [ed] Daniel J. Svyantek and Kevin Mahoney, Information Age Publishing, 2013Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

    This volume of the Research in Organizational Sciences is entitled "Received Wisdom, Kernels of Truth, and Boundary Conditions in Organizational Studies". Received wisdom is knowledge imparted to people by others and is based on authority and tenacity as sources of human knowledge. Authority refers to the acceptance of knowledge as truth because of the position and credibility of the knowledge source. Tenacity refers to the continued presentation of a particular bit of information by a source until this bit of information is accepted as true by receivers. The problem for organizational studies, however, is that this received wisdom often becomes unquestioned assumptions which guide interpretation of the world and decisions made about the world. Received wisdom, therefore, may lead to organizational practices which provide little or no benefit to the organization and, potentially, negative organizational effects, because this received wisdom is no longer valid. The 14 papers in this volume all, in some way, strive to question received wisdom and present alternatives which expand our understanding of organizational behavior in some way. The chapters in this volume each strive to present new ways of understanding organizational constructs, and in so doing reveal how received wisdom has often led to confirmation bias in organizational science. The knowledge that some perceived truths are actually the products of received wisdom and do not stand up to close scrutiny shakes up things within research areas previously thought settled allowing new perspectives on organizational science to emerge

    Ort, förlag, år, upplaga, sidor
    Information Age Publishing, 2013
    Serie
    Research in organizational sciences
    Nyckelord
    Organizational behavior, BUSINESS & ECONOMICS / Negotiating
    Nationell ämneskategori
    Maskinteknik
    Identifikatorer
    urn:nbn:se:liu:diva-93636 (URN)9781623961893 (ISBN)9781623961909 (ISBN)
    Tillgänglig från: 2013-06-04 Skapad: 2013-06-04 Senast uppdaterad: 2016-11-09Bibliografiskt granskad
    3. Model Based Definition within relocation of aircraft production
    Öppna denna publikation i ny flik eller fönster >>Model Based Definition within relocation of aircraft production
    2012 (Engelska)Ingår i: ICAS 2012 CD-ROM PROCEEDINGS. 28TH CONGRESS OF THE INTERNATIONAL COUNCIL OF THE AERONAUTICAL SCIENCES 23 - 28 September, 2012, Brisbane, Australia, 2012, s. 1-9Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    Abstract [en]

    The purpose of the paper is to discuss how relocation of production can be affected when MBD is applied. The research is performed from a view point of production relocation; the focus is not on MBD as a method. The paper is based on a literature review combined with empirical data from an industrial study at the Swedish enterprise Saab Aeronautics. It was hard to find gaps in the literature since no literature covering the aim of the research was found. Important subject of discussion was that update or creation of MBD production documentation can decrease the amount of tacit knowledge at the sender and help the possibility to differentiate off-line learning from on-line learning, which can save both time and cost.

    Nyckelord
    MBD, Production Relocation, Aircraft Production, Production Transfer
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-89576 (URN)978-0-9565333-1-9 (ISBN)
    Konferens
    28th International Congress of the Aeronautical Sciences (ICAS 2012), 23–28 September 2012, Brisbane, Australia
    Forskningsfinansiär
    VINNOVA
    Tillgänglig från: 2013-02-27 Skapad: 2013-02-27 Senast uppdaterad: 2016-11-09Bibliografiskt granskad
    4. A change process: transition from 2D to 3D by Model Based Definition
    Öppna denna publikation i ny flik eller fönster >>A change process: transition from 2D to 3D by Model Based Definition
    2014 (Engelska)Ingår i: Proceedings of the 6th Swedish Production Symposium (SPS), Gothenburg, Sweden. September 2014, 2014, s. 1-10Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
    Abstract [en]

    The purpose of the study is to investigate factors that are important for the transition from 2D to 3D by Model Based Definition (MBD). Within MBD, 3D models are used as sources of information for design, production, distribution, technical documentation, services and the overall product lifecycle. The introduction and development of MBD at Aeronautics can be described in five transitions that illustrate how knowledge enhancement from project to project and between the projects and the linear organization has evolved. The largest challenges have been in the start-up of the transitions, people are gathered with different prerequisites, seeing solutions or problems from different perspectives.

    Nyckelord
    Change Process, Organizational change, Implementation, Development, Model Based Definition
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-132403 (URN)
    Konferens
    The 6th Swedish Production Symposium, (SPS), 16-18 September, Gothenburg
    Tillgänglig från: 2016-11-08 Skapad: 2016-11-08 Senast uppdaterad: 2016-11-14Bibliografiskt granskad
    5. Bridging capability gaps in technology transfers within related offsets
    Öppna denna publikation i ny flik eller fönster >>Bridging capability gaps in technology transfers within related offsets
    2016 (Engelska)Ingår i: Journal of Manufacturing Technology Management, ISSN 1741-038X, E-ISSN 1758-7786, Vol. 27, nr 5, s. 640-661Artikel i tidskrift (Refereegranskat) Published
    Abstract [en]

    Purpose – The purpose of this paper is to explore how capability gaps can be identified and how they can be dealt with in aircraft technology transfers in future offset deals.

    Methodology – The study is based on lessons learned as identified from three case studies of technology transfers from Saab, a Swedish aircraft manufacturing company to South Africa, the Czech Republic, and India.

    FindingsThe capability gap between sender and receiver has to be dealt with on two levels: on an organizational level; and on an individual level. It is proposed that the disseminative capacity constitutes the ability to assess the capability gap between the sender and receiver, and to convert this assessment to adaptations of the product and production process to include in an industrialization process. On the individual level, the capability-raising activities were connected to employees’ knowledge, Personal Development Plans for the transfer of explicit knowledge, as well as on-the-job training to facilitate the exchange of tacit knowledge.

    Research limitations The research is based on case studies from one company.

    Originality/value – The paper focuses on the context of offset and reports on actual experiences from a capability perspective of technology transfers within the aircraft manufacturing area. It proposes a structured way of identifying and bridging the capability gap within such transfers.

    Ort, förlag, år, upplaga, sidor
    Emerald Group Publishing Limited, 2016
    Nyckelord
    Capability gap, industrialization process, capability growth, transfer process, related offset, aircraft industry
    Nationell ämneskategori
    Produktionsteknik, arbetsvetenskap och ergonomi
    Identifikatorer
    urn:nbn:se:liu:diva-128130 (URN)10.1108/JMTM-11-2015-0101 (DOI)000381441400002 ()
    Anmärkning

    Forthcoming

    Tillgänglig från: 2016-05-19 Skapad: 2016-05-19 Senast uppdaterad: 2018-03-09Bibliografiskt granskad
    Ladda ner fulltext (pdf)
    Technology Transfer within Related Offset Business: From an Aircraft Production Perspective
    Ladda ner (pdf)
    omslag
    Ladda ner (jpg)
    presentationsbild
  • 237.
    Malm, Anna
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska fakulteten.
    Fredriksson, Anna
    Linköpings universitet, Institutionen för teknik och naturvetenskap, Kommunikations- och transportsystem. Linköpings universitet, Tekniska fakulteten.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Bridging capability gaps in technology transfers within related offsets2016Ingår i: Journal of Manufacturing Technology Management, ISSN 1741-038X, E-ISSN 1758-7786, Vol. 27, nr 5, s. 640-661Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Purpose – The purpose of this paper is to explore how capability gaps can be identified and how they can be dealt with in aircraft technology transfers in future offset deals.

    Methodology – The study is based on lessons learned as identified from three case studies of technology transfers from Saab, a Swedish aircraft manufacturing company to South Africa, the Czech Republic, and India.

    FindingsThe capability gap between sender and receiver has to be dealt with on two levels: on an organizational level; and on an individual level. It is proposed that the disseminative capacity constitutes the ability to assess the capability gap between the sender and receiver, and to convert this assessment to adaptations of the product and production process to include in an industrialization process. On the individual level, the capability-raising activities were connected to employees’ knowledge, Personal Development Plans for the transfer of explicit knowledge, as well as on-the-job training to facilitate the exchange of tacit knowledge.

    Research limitations The research is based on case studies from one company.

    Originality/value – The paper focuses on the context of offset and reports on actual experiences from a capability perspective of technology transfers within the aircraft manufacturing area. It proposes a structured way of identifying and bridging the capability gap within such transfers.

  • 238.
    Malm, Anna
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Industriell Produktion. Linköpings universitet, Tekniska högskolan.
    Johansen, Kerstin
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Exchange of tacit knowledge within advanced production with small batch sizes2013Ingår i: Received wisdom, kernels of truth, and boundary conditions in organizational studies / [ed] Daniel J. Svyantek and Kevin Mahoney, Information Age Publishing, 2013Kapitel i bok, del av antologi (Övrigt vetenskapligt)
    Abstract [en]

    This volume of the Research in Organizational Sciences is entitled "Received Wisdom, Kernels of Truth, and Boundary Conditions in Organizational Studies". Received wisdom is knowledge imparted to people by others and is based on authority and tenacity as sources of human knowledge. Authority refers to the acceptance of knowledge as truth because of the position and credibility of the knowledge source. Tenacity refers to the continued presentation of a particular bit of information by a source until this bit of information is accepted as true by receivers. The problem for organizational studies, however, is that this received wisdom often becomes unquestioned assumptions which guide interpretation of the world and decisions made about the world. Received wisdom, therefore, may lead to organizational practices which provide little or no benefit to the organization and, potentially, negative organizational effects, because this received wisdom is no longer valid. The 14 papers in this volume all, in some way, strive to question received wisdom and present alternatives which expand our understanding of organizational behavior in some way. The chapters in this volume each strive to present new ways of understanding organizational constructs, and in so doing reveal how received wisdom has often led to confirmation bias in organizational science. The knowledge that some perceived truths are actually the products of received wisdom and do not stand up to close scrutiny shakes up things within research areas previously thought settled allowing new perspectives on organizational science to emerge

  • 239.
    Marco-Almagro, Lluis
    et al.
    Universitat Politecnica de Catalunya / BarcelonaTech, Spain.
    Tort-Martorell, Xavier
    Universitat Politecnica de Catalunya / BarcelonaTech, Spain.
    Schütte, Simon
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Segmentation in Kansei Engineering Studies Based on the Emotional Response2018Ingår i: Proceedings KEER2018, Go Green with Emotion. 7th International Conference on Kansei Engineering & Emotion Research 2018, 19-22 March 2018, Kuching, Malaysia / [ed] Anitawati Lokman and Simon Schütte, Linköping: Linköping University Electronic Press, 2018, s. 231-238Konferensbidrag (Refereegranskat)
    Abstract [en]

    Socioeconomic and demographic data of participants are often collected when performing a Kansei Engineering study for stratification purposes. This paper offers an alternative stratification procedure, directly based on the emotional response that participants give to prototypes. This approach can deliver groups that are more meaningful for the Kansei Engineering study. Socioeconomic and demographic data (among other kinds of data) can then be used to characterize the obtained emotional groups.

    Ladda ner fulltext (pdf)
    Segmentation in Kansei Engineering Studies Based on the Emotional Response
  • 240.
    Maria, Lillberg
    et al.
    Linköpings universitet, Institutionen för systemteknik, Elektroniska Kretsar och System.
    Amanda, Eriksson
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Institutionen för systemteknik.
    Konstruktion av testsystem för tröghetssensorer2018Självständigt arbete på grundnivå (högskoleexamen), 10,5 poäng / 16 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Rapporten presenterar ett projekt som genomförts i samarbete med företaget Intuitive Aerial AB med syfte att skapa en rörelsesimulator för att kalibrera tröghetssensorer. Med en studie av liknande produkter på marknaden samt krav från uppgiftsbeställaren skapades en kravspecifikation som blev grunden för den fortsatta utvecklingen av simulatorn. Kravet var att skapa en rörelsesimulator som ska kunna rotera i tre axlar samt vara orörlig i en given position.

    Olika typer av DC-motorer till rörelsesimulatorn analyserades och stegmotor med inbyggd enkoder valdes för att dess styrka var att de kan vara orörliga i en position utan reglering. Utvecklingen har gjorts i två parallella spår. Det ena spåret har varit att skapa en fysisk konstruktion och det andra spåret har inneburit programmering av motorer samt signalbehandling. Utvecklingen av rörelsesimulatorn innebar framtagning av en konstruktion med rotation i tre axlar, en plattform där det går snabbt att fästa och lossa tröghetssensorerna samt val av tillverkningsmaterial. Motorerna programmerades för att rotera i en konstant hastighet, stanna i en given position samt lokalisera ett givet nolläge.

    Resultatet av projektet blev en prototyp av en rörelsesimulator för kalibrering av tröghetsensorer. Simulatorn består av delar i plast och aluminium. Tröghetssensorerna fästs på en adapterplatta med distanshållare för kretskort.

    Slutsatserna är att rörelsesimulatorer kan skapas med en enkel konstruktion. Motorerna har inte kunnat testas i simulatorn efter montering, men tester innan montering visade att motorernas egenskaper gör att kravspecifikationen för rörelsesimulatorn är uppnådd. Det fortsatta arbetet består av att utföra tester på rörelsesimulatorn för att analysera dess noggrannhet. Därefter kan tröghetssensorerna kalibreras.

    Ladda ner fulltext (pdf)
    fulltext
  • 241.
    Martin, Aronsson
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Hedsand, Max
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Jonsson, Lukas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Kingfors, Linus
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Svanäng, Carl-Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Viberg, Daniel
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Vilhelmsson, Johannes
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Wiberg, Marcus
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Trächassi: Projektrapport TMMI532016Rapport (Övrigt vetenskapligt)
    Abstract [sv]

    Det här projektet har undersökt möjligheten att bygga ett chassi av trä till en Formula student-bil. Det skall undersökas om chassit är konkurrenskraftigt både gällande vikt och prestanda gentemot den stålram som idag används. Formula student är en racingtävling för team från olika universitet runt om i hela världen. Enligt reglerna i den tävlingen finns det vissa komponenter i chassit som måste vara i stål. Vi har tagit hänsyn till dessa regler, men i övrigt så långt som möjligt använt träbaserade material.

    Ladda ner fulltext (pdf)
    Trächassi
  • 242.
    Melin, Tomas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Amadori, Kristian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Parametric wing profile description for conceptual design2011Konferensbidrag (Refereegranskat)
    Abstract [en]

    A fundamental part of aircraft design involves the wing airfoil optimization, establishing an outer shape of the wing which has good aerodynamic performance, good internal volume distribution for fuel and systems and which also serves as an efficient structural member supporting the weight of the aircraft. As for all optimization tasks, the complexity of the problem is directly coupled to the parameterization of the geometry. Of highest relevance are the number of parameters and the number of additional constraints that are required to ensure valid modeling.This paper proposes a parameterization method for two dimensional airfoils, aimed at providing a wide design space, while at the same time keeping the number of parameters low. With 15 parameters defining the wing profile, many of the existing airfoils can be modeled with close tolerance.

    Ladda ner fulltext (pdf)
    fulltext
  • 243.
    Melin, Tomas
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska högskolan.
    Amadori, Kristian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Parametric wing profile description for conceptual design2011Ingår i: CEAS 2011 Proceedings, 2011Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    A fundamental part of aircraft design involves the wing airfoil optimization, establishing an outer shape of the wing which has good aerodynamic performance, good internal volume distribution for fuel and systems and which also serves as an efficient structural member supporting the weight of the aircraft. As for all optimization tasks, the complexity of the problem is directly coupled to the parameterization of the geometry. Of highest relevance are the number of parameters and the number of additional constraints that are required to ensure valid modeling.This paper proposes a parameterization method for two dimensional airfoils, aimed at providing a wide design space, while at the same time keeping the number of parameters low. With 15 parameters defining the wing profile, many of the existing airfoils can be modeled with close tolerance.Several approaches to parameterization of wing profiles can be found in the literature. Airfoils can be described by point clouds as done in most airfoil libraries [1]. The number of parameters is twice as large as the number of points used (x and y coordinates) and in the case of aerodynamic optimization this parameterization will most certainly be not well behaved, since no smoothing function is included and must therefore be added. Other problems may arise for the fact that the airfoils sometimes are defined with too few coordinate points and/or too few decimals, a problem occurring especially with old airfoils. On the other hand, the design space that this kind of parameterization allows representing is extremely large, as any and all shapes can be reproduced, even degenerate ones.

  • 244.
    Moëll, Daniel
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Nordin, Joachim
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    VTOL UAV - A Concept Study2008Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats
    Abstract [en]

    This thesis deals with the development of a Conceptual Design Tool for unmanned helicopters, so called VTOL UAVs. The goal of the Design Tool is:

    • Quick results

    • Good accuracy

    • Easy to use

    The two first points of the goal are actually more or less dependent on each other. In almost all cases a high accuracy gives a slow calculator and vice versa. In order to fulfill the goal a compromise between calculation accuracy and calculation time needs to be done.

    To make the Design Tool an easy to use program a graphical user interface is used. The graphical user interface allows the user to systematically work his way thru the program from a fictive mission to a complete design of a helicopter. The pre-requirements on the user have been eliminated to a minimum, but for the advanced user the possibilities to create more specific and complex helicopters are good.

    In order to develop a Conceptual Design Tool the entire helicopter needs to be seen as a complete system. To see the helicopter as a system all of the sub parts of a helicopter need to be studied. The sub parts will be compared against each other and some will be higher prioritized than other.

    The outline of this thesis is that it is possible to make a user friendly Conceptual Design Tool for VTOL UAVs. The design procedure in the Design Tool is relatively simple and the time from start to a complete concept is relatively short. It will also be shown that the calculation results have a good agreement with real world flight test data.

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  • 245.
    Munjulury, Raghu Chaitanya
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Berry, Patrick
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Melin, Tomas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Amadori, Kristian
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Krus, Petter
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Knowledge-based Integrated Wing Automation and Optimization for Conceptual Design2015Ingår i: 16th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference16th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, 2015Konferensbidrag (Refereegranskat)
    Abstract [en]

    Contemporary aircraft design and development incurs high costs and consumes a lot of time for research and implementation. To minimize the development cost, an improvement of the conceptual design phase is desirable. A framework to support the initial design space exploration and conceptual design phase is presently being developed at Linköping University. In the aircraft design, the geometry carries a critical, discriminating role since it stores a significant part of the information and the data needed for most investigations. Methodology for design automation of a wing with a detailed description such that the geometry is effectively propagated for further analysis is presented in this paper. Initial weight estimation of the wing is performed by combining the weight penalty method with a sophisticated CAD model. This wing model is used for airfoil shape optimization and later for structural optimization. A methodology for automatic meshing of the geometry for CFD and FEM when the surfaces increase or decrease during the design automation is proposed. The framework combining automation capability with shape and structural optimization will enhance the early design phases of aircraft conceptual design.

  • 246.
    Munjulury, Raghu Chaitanya
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Nadali Najafabadi, Hossein
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanisk värmeteori och strömningslära. Linköpings universitet, Tekniska fakulteten.
    Safavi, Edris
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Petter, Krus
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluida och mekatroniska system. Linköpings universitet, Tekniska fakulteten.
    Karlsson, Matts
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Mekanisk värmeteori och strömningslära. Linköpings universitet, Tekniska fakulteten.
    A comprehensive computational multidisciplinary design optimization approach for a tidal power plant turbine2017Ingår i: Advances in Mechanical Engineering, ISSN 1687-8132, E-ISSN 1687-8140, Vol. 9, nr 3, s. 1-13, artikel-id 1687814017695174Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Multidisciplinary design optimization has become a powerful technique to facilitate continuous improvement of complex and multidisciplinary products. Parametric modeling is an essential part with tremendous impact on the flexibility and robustness of multidisciplinary design optimization. This article investigates the effect of relational and non-relational parameterization techniques on the robustness and flexibility of the conceptual design of a multidisciplinary product. Bench marking between relational and non-relational parameterization and their effect on flexibility and robustness indicate that the relational parameterization is an efficient method in the multidisciplinary design optimization process. The inherent properties of the method contribute to an efficient parametric modeling with improved communication between different disciplines. This enhances the performance of the multidisciplinary design optimization process and allows a more flexible and robust design. The considered disciplines are computer-aided design, computational fluid dynamics, finite element analysis, and dynamic simulation. A high-fidelity geometry created in a computer-aided design environment is computer-aided design centric approach and later used in computational fluid dynamics, finite element analysis for a better understanding of the product as it leads to precise outcomes. The proposed approach is implemented for the conceptual design of a novel product, a tidal power plant developed by Minesto AB using a multidisciplinary design optimization process.

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    fulltext
  • 247.
    Namakian, Mohsen
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Mild Hybrid System in Combination with Waste Heat Recovery for Commercial Vehicles2013Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Performance of two different waste heat recovery systems (one based on Rankine cycle and the other one using thermoelectricity) combined with non-hybrid, mild-hybrid and full hybrid systems are investigated. The vehicle under investigation was a 440hp Scania truck, loaded by 40 tons. Input data included logged data from a long haulage drive test in Sweden.All systems (waste heat recovery as well as hybrid) are implemented and simulated in Matlab/Simulink. Almost all systems are modeled using measured data or performance curves provided by one manufacturer. For Rankine system results from another investigation were used.Regardless of practical issues in implementing systems, reduction in fuel consumption for six different combination of waste heat recovery systems and hybrid systems with different degrees of hybridization are calculated. In general Rankine cycle shows a better performance. However, due to improvements achieved in laboratories, thermoelectricity could also be an option in future.This study focuses on “system” point of view and therefore high precision calculations is not included. However it can be useful in making decisions for further investigations.

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    fulltext
  • 248.
    Nezhadali, Vaheed
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion.
    Multi-objective optimization of Industrial robots2011Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Industrial robots are the most widely manufactured and utilized type of robots in industries. Improving the design process of industrial robots would lead to further developments in robotics industries. Consequently, other dependant industries would be benefited. Therefore, there is an effort to make the design process more and more efficient and reliable. The design of industrial robots requires studies in various fields. Engineering softwares are the tools which facilitate and accelerate the robot design processes such as dynamic simulation, structural analysis, optimization, control and so forth. Therefore, designing a framework to automate the robot design process such that different tools interact automatically would be beneficial. In this thesis, the goal is to investigate the feasibility of integrating tools from different domains such as geometry modeling, dynamic simulation, finite element analysis and optimization in order to obtain an industrial robot design and optimization framework. Meanwhile, Meta modeling is used to replace the time consuming design steps. In the optimization step, various optimization algorithms are compared based on their performance and the best suited algorithm is selected. As a result, it is shown that the objectives are achievable in a sense that finite element analysis can be efficiently integrated with the other tools and the results can be optimized during the design process. A holistic framework which can be used for design of robots with several degrees of freedom is introduced at the end.

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    fulltext
  • 249.
    Nezhadali, Vaheed
    et al.
    Linköpings universitet, Institutionen för systemteknik. Linköpings universitet, Tekniska högskolan.
    Khaleeq Kayani, Omer
    Razzaq, Hannan
    Tarkian, Mehdi
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    EVALUATION OF AN AUTOMATED DESIGN AND OPTIMIZATION FRAMEWORK FOR MODULAR ROBOTS USING A PHYSICAL PROTOTYPE2011Ingår i: Proceedings of the 18th International Conference on Engineering Design (ICED11), Vol. 4, 2011, s. 195-204Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper presents an automated design and evaluation framework, by integrating design tools from various engineering domains for rapid evaluation of design alternatives. The presented framework enables engineers to perform simulation based optimizations. As a proof of concept a seven degree of freedom modular robot is designed and optimized using the automated framework. The designed robot is then manufactured to evaluate the framework using preliminary tests.

  • 250.
    Nilson, Joel
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Runosson, David
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Kvalitetsteknik. Linköpings universitet, Tekniska högskolan.
    Moisture and dust in lighting equipment: an investigation of customer perception and technical solutions2013Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Syfte

    Att undersöka behov och möjligheter att reducera problem med fukt och damminträngning i exteriöra belysningsartiklar på lastbilar genom att titta på kundacceptans och garantiärenden samt översätta detta till tekniska attribut.

    Metod

    Arbetet är upplagt som en del av ett Design for Six Sigma-projekt och innefattar stegen fram till Concept development and business/customer approval. Kända produktutvecklingsverktyg används för att ta fram underlag till konceptgenerering. Kundanalys utförs med hjälp av enkäter och undersökningar av garantiärenden.

    Resultat & slutsats

    Kundanalysen i denna examensrapport visar att Brasilien och Storbritannien är de länder där problemet uppfattas som störst. Den visar också att klagomål gällande damm är mycket vanligare än klagomål gällande fukt när det gäller lyktor placerade i den nedre delen i fronten på lastbilen. När resultaten från kundanalysen jämförs med de tekniska aspekterna finner man att det mest gynnsamma sättet att ta sig an problemet är att försöka få bra ett bra luftflöde i lyktorna men samtidigt minimera porstorleken. Detta kan man åstadkomma med hjälp av membran och CFD (Computational Fluid Dynamics) simuleringar. Lösningar som handlar om att fånga upp dammet och fukten accepteras också av kunden så länge som detta kan lösas med hjälp av den vanliga servicen.

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    Moisture and dust in lighting equipment
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