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  • 151.
    Lovén, Eva
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Industrial Ergonomics.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering.
    The degree of competition in co-opetition2004In: EIASM Workshop on coopetition strategy: Toward a new kind of interfirm dynamics,2004, 2004Conference paper (Other academic)
  • 152.
    Luciana, Pereira
    et al.
    Center for Engineering, Modeling, and Applied Social Sciences, Federal University of ABC, Santo André, Brazil.
    Krus, PetterLinköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.Klofsten, MagnusLinköping University, Department of Management and Engineering, Project Innovations and Entrepreneurship. Linköping University, Faculty of Science & Engineering.
    Proceedings of IDEAS 2022: Interdisciplinary Conference on Innovation, Design, Entrepreneurship, and Sustainable Systems2023Conference proceedings (editor) (Refereed)
    Abstract [en]

    This book explores the cutting-edge ideas that are shaping the future of innovation, design, entrepreneurship, and sustainability. The proceedings of the interdisciplinary Conference on Innovation, Design, Entrepreneurship, and Sustainable Systems offer new perspectives on these topics. This book navigates the most recent research trends and practices, and gains unique insights on how to address innovation, design, and entrepreneurship on a sustainable basis. This book is an essential reference for anyone interested in staying up to date on the latest research, whether they are academics, designers, entrepreneurs, or sustainability enthusiasts. Get your copy now and take part in the debate about the future of sustainable innovation.

  • 153. Lundström, D.
    et al.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Micro Aerial Vehicle Design Optimization using Mixed Discrete and Continuous Variables2006In: AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference,2006, Portsmouth, USA: AIAA/ISSMO , 2006Conference paper (Other academic)
  • 154.
    Lundström, David
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Amadori, Kristian
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Automation of Design and Prototyping of Micro Aerial Vehicle2009Conference paper (Refereed)
    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
  • 155.
    Lundström, David
    et al.
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Amadori, Kristian
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Distributed Framework for Micro Aerial Vehicle Design Automation2008In: Proceedings from the 46th AIAA Aerospace Sciences Meeting and Exhibit, 7 - 10 January, Reno, NV, USA, AIAA , 2008, p. 140-Conference paper (Other academic)
    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.

     

  • 156.
    Lundström, David
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Amadori, Kristian
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology.
    Validation of Models for Small Scale Electric Propulsion Systems2010Conference paper (Other academic)
    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.

  • 157.
    Lundström, David
    et al.
    Linköping University, Department of Computer and Information Science, AUTTEK - Autonomous Unmanned Aerial Vehicle Research Group . Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Micro Aerial Vehicle Design Optimization using Mixed Discrete and Continuous Variables2006In: A collection of technical papers : 11th AIAAA/ISSMO Multidisciplinary Analysis and Optimization Conferences, Reston, Virginia, USA: American Institute of Aeronautics and Astronautics, 2006, p. 1277-1290Conference paper (Refereed)
    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.

  • 158.
    Lundström, David
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Testing of Atmospheric Turbulence Effects on the Performance of Micro Air Vehicles2012In: INTERNATIONAL JOURNAL OF MICRO AIR VEHICLES, ISSN 1756-8293, Vol. 4, no 2, p. 133-149Article in journal (Refereed)
    Abstract [en]

    Micro Air Vehicles (MAV) are generally operated at low altitudes and within the earth boundary layer. This is a very dynamic environment with varying wind intensity and turbulence levels far greater than those experienced by traditional manned aircraft cruising at higher altitudes. Yet aerodynamic research on MAVs is often based on the assumption of steady aerodynamics. Little effort has been made to experimentally determine the validity of this assumption. In this paper, the effect of turbulence on the performance of a MAV is studied using flight testing in different wind conditions. Flight testing technique, data logging equipment and data reduction are explained. Additionally, a low cost technique for propeller performance measurement is presented. Results show that the flow around a MAV flying in windy conditions qualifies as highly unsteady, although the impact on its performance is surprisingly small for the kind of turbulence levels at which MAVs can be expected to operate. Accelerometer data from the flights reveals that if steady aerodynamic theory is assumed, increasing turbulence should have resulted in a measurable drag increase, thus indicating that the tested MAV to some extent passively manages to benefit from the turbulence.

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  • 159.
    Melin, Tomas
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Amadori, Kristian
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Parametric wing profile description for conceptual design2011Conference paper (Refereed)
    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.

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  • 160.
    Melin, Tomas
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Amadori, Kristian
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Parametric wing profile description for conceptual design2011In: CEAS 2011 Proceedings, 2011Conference paper (Other academic)
    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.

  • 161.
    Melin, Tomas
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, PetterLinköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.Vinterhav, EmilSSC ECAPS.Övrebö, KnutSAAB AB, Sweden.
    PROCEEDINGS of the 4:th CEAS conference in Linköping, 20132013Conference proceedings (editor) (Refereed)
    Abstract [en]

    Europe has a strong and proud tradition in aerospace and astronautics, which indeed is a very important area for Europe. It represents a substantial business domain, but maybe equally important, it is also a driver for technology development and innovation that benefits the society as a whole. One of Europe’s greatest challenges is about independence, in order to keep and maintain capabilities within the complete set of technologies needed as a foundation for a sustainable aerospace industry in Europe. This is important when Europe has to look at the next generation of Air Power. It is also fundamental for Europe to be an attractive partner in international projects conducted with global collaboration.

    CEAS – Council of European Aerospace Societies – is an organisation bringing European national aerospace organisations together for increased international strength. Today, CEAS comprises sixteen member organisations with roughly 35,000 individual members. CEAS hosts biennial conferences on aeronautics in Europe where CEAS 2013 in Linköping is the fourth after Venice 2011, Manchester 2009 and Berlin 2007.

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    Proceedings
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    Book of abstracts
  • 162.
    Modrak, Vladimir
    et al.
    Kosice Faculty of Manufacturing Technologies, Slovakia.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, Faculty of Science & Engineering.
    Bednar, Slavo
    Technical University of Kosice Faculty of Manufacturing Technologies,Slovakia.
    Approaches to Product Variety Management Assuming Configuration Conflict Problem2015In: FME Transactions, ISSN 1451-2092, Vol. 43, no 4, p. 271-277Article in journal (Refereed)
    Abstract [en]

    Complexity problems in mass customized manufacturing are frequently discussed and analysed in order to find suitable methods to optimize extent of product varietes. Moreover, product designers have to consider also constraint satisfaction problem, since some serious conflicts may occur when requirements of the customer are specified based on a wide portfolio of modules or components and given configurations cannot be found. The main scope of this paper is to explore the possibilities of using axiomatic design theory and entropy based measures for quantifying product variety induced complexity. For this purpose, two approaches will be applied on a real case. Then a comparison and analysis of obtained results are included. Computational experiments showed that proposed approaches offer comparable results and can be effectively used to quantify varietyinduced complexity in terms of mass-customized manufacturing.

  • 163.
    Monteiro, Diego de Matos
    et al.
    Instituto Tecnológico de Aeronáutica, BR.
    Nepomuceno, Leonardo Murilo
    Instituto Tecnológico de Aeronáutica, BR.
    Annes da Silva, Roberto Gil
    Instituto Tecnológico de Aeronáutica, BR.
    da Silva e Souza, Marcos
    Instituto de Aeronáutica e Espaço, BR.
    Silvestre, Flávio José
    Instituto Tecnológico de Aeronáutica, BR.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Sobron, Alejandro
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Subscale Flight Test Model Development and Testing as a Tool for Unconventional Aircraft Design2017In: 6th CEAS Air and Space Conference, Aerospace Europe 2017 / [ed] George Bogdan Gherman, 2017, p. 495-496, article id 929Conference paper (Other academic)
    Abstract [en]

    This work has the objective to show development of a non-conventional subscale aircraft tests and compare a preliminary numerical analysis with wind tunnel tests. The subscale flight tests can be used as a low cost tool and that can improve the learning curve, considering the future aircrafts are characterized by the use of new technologies and radical configurations. For this validation was built the ITA-BWB aircraft, a single engine and tailless concept. This project demonstrates all steps of preliminary analysis with VLM software, preliminary flight tests and wind tunnel tests, where these data were used for simulations of specific maneuvers used in parameter identification. Finally, the simulations demonstrated consistency between the static derivatives acquired by VLMsoftware and wind tunnel tests, which were used to estimate dynamic derivatives that allowed the simulation of specific maneuvers for subscale flight tests.

  • 164.
    Munjulury, Raghu Chaitanya
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Berry, Patrick
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Melin, Tomas
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Amadori, Kristian
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Knowledge-based Integrated Wing Automation and Optimization for Conceptual Design2015In: 16th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference16th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, 2015Conference paper (Refereed)
    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.

  • 165.
    Munjulury, Raghu Chaitanya
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Staack, Ingo
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Abdalla, Alvaro Martins
    The University of São Paulo (USP), Brazil.
    Melin, Tomas
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Jouannet, Christopher
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Knowledge-based design for future combat aircraft concepts2014Conference paper (Refereed)
    Abstract [en]

    A new fighter aircraft will most likely be acollaborative project. In this study conceptualknowledge-based design is demonstrated, usingmodels of comparable fidelity for sizing, geometrydesign, aerodynamic analysis and system simulationfor aircraft conceptual design. A newgeneration fighter is likely to involve advancedcontrol concept where an assessment of feasibilitythrough simulation is needed already atthe conceptual stage. This co-design leads to adeeper understanding of the trade-offs involved.In this paper a study for a future combat aircraftis made. Conceptual knowledge-based design isdemonstrated by optimizing for a design mission,including a super-cruise segment.

  • 166.
    Munjulury, Raghu Chaitanya
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Staack, Ingo
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Berry, Patrick
    Saab Aeronautics, Linköping.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    A knowledge-based integrated aircraft conceptual design framework2016In: CEAS Aeronautical Journal, ISSN 1869-5582, 1869-5590, Vol. 7, no 1, p. 95-105Article in journal (Refereed)
    Abstract [en]

    "The conceptual design is the early stage of aircraft design process where results are needed fast, both analytically and visually so that the design can be analyzed and eventually improved in the initial phases. Although there is no necessity for a CAD model from the very beginning of the design process, it can be an added advantage to have the model to get the impression and appearance. Furthermore, this means that a seamless transition into preliminary design is achieved since the CAD model can guardedly be made more detailed. For this purpose, knowledge-based aircraft conceptual design applications Tango (Matlab) and RAPID (CATIA) are being developed at Linköping University. Based on a parametric data definition in XML, this approach allows for a full 3D CAD integration. The one-database approach, also explored by many research organizations, enables the flexible and efficient integration of the different multidisciplinary processes during the whole conceptual design phase. This paper describes the knowledge-based design automated methodology of RAPID, data processing between RAPID and Tango and its application in the courses ‘‘Aircraft conceptual design’’ and ‘‘Aircraft project course’’ at Linköping University. A multifaceted user interface is developed to assist the whole design process."

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    fulltext
  • 167.
    Munjulury, Venkata Raghu Chaitanya
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Berry, Patrick
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    RAPID – Robust Aircraft Parametric Interactive Design: A Knowledge Based Aircraft Conceptual Design Tool2013In: Proceedings of the 4th CEAS Conference in Linköping 2013: 4:th CEAS conference, 2013 / [ed] Tomas Melin, Petter Krus, Emil Vinterhav and Knut Övrebo, Linköping, 2013, p. 255-262Conference paper (Refereed)
    Abstract [en]

    Conceptual design is the early stage of theaircraft design process where results areneeded faster both analytically and visually sothat the design can be modified or changed atthe earliest stages. Although there is nonecessity for a CAD model from the verybeginning of the design process it can be anadded advantage to have the model, to get theimpression and appearance.Tango and RAPID are knowledge basedaircraft conceptual design applications beingdeveloped in Matlab and CATIA respectively.The user can work in parallel with bothprograms and exchange the data between themvia XML. This paper describes the knowledgebased design automated methodology of RAPIDand its application in the courses “Aircraftconceptual design” and “Aircraft projectcourse” at Linköping University. A multifaceteduser interface is developed to assist in the wholedesign processes.

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    RAPID – Robust Aircraft Parametric Interactive Design: A Knowledge Based Aircraft Conceptual Design Tool
  • 168.
    Munjulury, Venkata Raghu Chaitanya
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Staack, Ingo
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Integrated Aircraft Design Network2013In: CEAS 2013 The International Conference of the European Aerospace Societies: 4:th CEAS conference, 2013 / [ed] Tomas Melin, Petter Krus, Emil Vinterhav, Knut Övrebo, Linköping, 2013, p. 263-269Conference paper (Refereed)
    Abstract [en]

    This paper describes the XML basedmultidisciplinary tool integration in aconceptual aircraft design framework,developed by the Division of Fluid andMechatronic Systems (FluMeS), LinköpingUniversity. Based on a parametric datadefinition in XML, this approach allows for afull 3D CAD integration. The one-databaseapproach, also conducted by many researchorganizations, enables the flexible and efficientintegration of the different multidisciplinaryprocesses during the whole conceptual designphase. This central database approach with adetailed explanation of the developed geometrydescription and the data processing, focusing onthe CAD integration is presented. Applicationexamples of the framework are presentedshowing the data build up and data handling.

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    183_CEAS2013
  • 169.
    Munro, Cameron
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering.
    Jouannet, Christopher
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Correlation of flow visualization and force and moment measurements in a water tunnel2003In: The World Aviation Congress,2003, Montreal, Canada: World Aviation Congress , 2003Conference paper (Refereed)
    Abstract [en]

       

  • 170.
    Munro, Cameron
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering.
    Jouannet, Christopher
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Flow visualisation and force and moment correlations in a water tunnel2003In: Triennial International Symposium on Fluid Control,2003, 2003Conference paper (Other academic)
    Abstract [en]

      

  • 171.
    Munro, Cameron
    et al.
    Linköping University, Department of Mechanical Engineering.
    Jouannet, Christopher
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Statistical Study of Unmanned Air Vehicles for the Platform Designer2003In: 3rd International Conference on Advanced Engineering Design,2003, 2003Conference paper (Refereed)
  • 172.
    Munro, Cameron
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering.
    Jouannet, Christopher
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Statistical survey of unmanned air vehicles for the platform designer2004In: International Conference on Advanced Engineering Design,2003, Prague, Czech republic: Advanced Engineering Design , 2004Conference paper (Refereed)
    Abstract [en]

      

  • 173.
    Munro, Cameron
    et al.
    IKP .
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Berry, Patrick
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Integration of Subscale Flight Testing in Design Education2000In: International Congress or Aeronautical Sciences,2000, 2000Conference paper (Other academic)
  • 174.
    Munro, Cameron
    et al.
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Jouannet, Christopher
    Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
    Implications of scale effect for the prediction of high angle of attack aerodynamics2005In: Progress in Aerospace Sciences, ISSN 0376-0421, E-ISSN 1873-1724, ISSN 0376-0421, Vol. 41, no 3-4, p. 301-322Article in journal (Refereed)
    Abstract [en]

    Scale effect is of significance in all experimental aerodynamics testing. At high angles of attack such issues as Reynolds and Mach number scaling are further complicated by the presence of complex, unsteady separated flow structures. The understanding and quantification of such flow effects remains a substantial challenge to the combat aircraft designer. The challenge, especially during conceptual and preliminary design stages, is to obtain sufficiently accurate information to make relevant design decisions, addressing potential weaknesses before proceeding to detail design. The focus in the present review is on the application of the water tunnel in such cases. The combination of qualitative and quantitative data obtainable from the water tunnel provides a useful complement to other tools during the early design stages. The effect of Reynolds number in particular is however critical; and appreciation of its effects are critical to the effective use of such a tool. It is shown however that for certain configurations such effects can be small in comparison to other experimental effects.

  • 175.
    Nepomuceno, Leonardo Murilo
    et al.
    Aeronaut Inst Technol, Brazil.
    Annes da Silva, Roberto Gil
    Aeronaut Inst Technol, Brazil.
    Sobron, Alejandro
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Lundström, David
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Estimation of lift characteristics of a subscale fighter using low-cost experimental methods2022In: AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY, ISSN 1748-8842, Vol. 94, no 8, p. 1379-1389Article in journal (Refereed)
    Abstract [en]

    Purpose While computational methods are prevalent in aircraft conceptual design, recent advances in mechatronics and manufacturing are lowering the cost of practical experiments. Focussing on a relatively simple property, the lift curve, this study aims to increase understanding of how basic aerodynamic characteristics of a complex stealth configuration can be estimated experimentally using low-cost equipment, rapid prototyping methods and remotely piloted aircraft. Design/methodology/approach Lift curve estimates are obtained from a wind tunnel test of a three-dimensional-printed, 3.8%-scale model of a generic fighter and from flight testing a 14%-scale demonstrator using both a simple and a more advanced identification technique based on neural networks. These results are compared to a computational fluid dynamics study, a panel method and a straightforward, theoretical approach based on radical geometry simplifications. Findings Besides a good agreement in the linear region, discrepancies at high angles of attack reveal the shortcomings of each method. The remotely piloted model manages to provide consistent results beyond the physical limitations of the wind tunnel although it seems limited by instrumentation capabilities and unmodelled thrust effects. Practical implications Physical models can, even though low-cost experiments, expand the capabilities of other aerodynamic tools and contribute to reducing uncertainty when other estimations diverge. Originality/value This study highlights the limitations of commonly used aerodynamic methods and shows how low-cost prototyping and testing can complement or validate other estimations in the early study of a complex configuration.

  • 176.
    Nordin, Peter
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Braun, Robert
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Job-Scheduling of Distributed Simulation-Based Optimization with Support for Multi-Level Parallelism2015In: Proceedings of the 56th Conference on Simulation and Modelling (SIMS 56): October, 7-9, 2015, Linköping University, Sweden, Linköping: Linköping University Electronic Press, 2015, p. 187-197Conference paper (Refereed)
    Abstract [en]

    In many organizations, the utilization of available computer power is very low. If it could be harnessed for parallel simulation and optimization, valuable time could be saved. A framework monitoring available computer resources and running distributed simulations is proposed. Users build their models locally, and then let a job scheduler determine how the simulation work should be divided among remote computers providing simulation services. Typical applications include sensitivity analysis, co-simulation and design optimization. The latter is used to demonstrate the framework. Optimizations can be parallelized either across the algorithm or across the model. An algorithm for finding the optimal distribution of the different levels of parallelism is proposed. An initial implementation of the framework, using the Hopsan simulation tool, is presented. Three parallel optimization algorithms have been used to verify the method and a thorough examination of their parallel speed-up is included.

  • 177.
    Pereira, Luciana
    et al.
    Federal University of ABC, Santo Andre, Brazil.
    Carvalho, JoséFederal University of Amazonas, Manaus, Brazil.Krus, PetterLinköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.Klofsten, MagnusLinköping University, Department of Management and Engineering, Project Innovations and Entrepreneurship. Linköping University, Faculty of Science & Engineering. Linköping University, HELIX Competence Centre.De Negri, VictorFedderal University of Santa Catarina, Florianópolis, Brazil.
    Proceedings of IDEAS 2019 - the interdisciplinary conference on innovation, design, entrepreneurship and sustainable systems.2019Conference proceedings (editor) (Refereed)
    Abstract [en]

    Over the past decades, innovations have emerged from problem-oriented research based on knowledge integration at the intersection of different disciplines. Therefore, interdisciplinary collaboration   has been critical to find solutions for complex societal challenges. However, there are little spaces within and beyond the academy where researchers are encouraged to defy their field's boundaries -- leveraging their disciplinary mindset into contributions to broad domains, particularly within the Science, Technology, Engineering, Entrepreneurship, and Management (STEEM) and across Social Sciences and the Humanities. Ideas conference aims to stimulate novel questions and challenge existing policy and practices on more innovative and sustainable systems.  Throughout history, technological innovation has led to the most significant dimensions of development – economic, social, and environmental - underpinning core changes in the way we live. 

  • 178.
    Pettersson, Karl
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Heybroek, Kim
    Volvo Construction Equipment AB.
    Klintemyr, Andreas
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Analysis and control of a complementary energy recuperation system2012In: 8th International Fluid Power Conference Dresden: "Fluid Power Drives!", Dresden, 2012, p. 529-540Conference paper (Other academic)
    Abstract [en]

    In recent years, hybrid technologies have been in focus in both industry and academia.This paper deals with a hydraulically connected energy storage system based on a twomachinehydraulic transformer. Connecting the energy storage system hydraulically enableseasy disconnection and possibly fewer power domain transformations than with theconventional mechanically connected parallel hybrid structure. The control feasibility anddifferent control aspects are investigated and a control strategy is proposed. The controlstrategy is based on linear control techniques and it is shown that even with simple modelsof the system, sufficient control performance can be achieved.

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  • 179.
    Pettersson, Karl
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Driveline Systems, Volvo Construction Equipment, Eskilstuna, Sweden.
    Heybroek, Kim
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Emerging Technologies, Volvo Construction Equipment, Eskilstuna, Sweden.
    Mattsson, Per
    Driveline Systems, Volvo Construction Equipment, Eskilstuna, Sweden.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    A novel hydromechanical hybrid motion system for construction machines2017In: International Journal of Fluid Power, ISSN 1439-9776, Vol. 18, no 1, p. 17-28Article in journal (Refereed)
    Abstract [en]

    This paper deals with a novel type of hybrid motion system for construction machines based on a common pressure rail shared between a hydromechanical power-split transmission and secondary controlled work hydraulics. A construction machine with driveline and work functions is a complex coupled motion system and the design of an effective hybrid system needs to take both subsystems into account. Studies on energy efficient hybrid systems for construction machines have hitherto principally focused on one subsystem at a time - work hydraulics or driveline. The paper demonstrates a use case with a specific transmission concept proposal for a medium-sized wheel loader. The system is modelled and simulated using an optimal energy management strategy based on dynamic programming. The results show the benefits of a throttle-free bidirectional link between the machine's subsystems and the energy storage, while taking advantage of the complex power flows of the power-split transmission.

  • 180.
    Pettersson, Karl
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Design Optimization of Complex Hydromechanical Transmissions2013In: Journal of mechanical design (1990), ISSN 1050-0472, E-ISSN 1528-9001, Vol. 135, no 9, p. 091005-1-091005-9Article in journal (Refereed)
    Abstract [en]

    Demands for higher fuel efficiency for off-highway applications motivate manufacturers to replace existing drive transmissions with more complex, high-efficiency transmissions. Increased intelligence and more advanced architectures are, however, more difficult to design and prototype. This leads to longer product development processes and a greater need for early product evaluation. The great variety of existing concepts also requires a methodology to support the choice of architecture. This paper proposes a design methodology for complex hydromechanical transmissions based on optimization. The main objective is to maximize energy efficiency and adapt the design to suit the typical operating behavior of the application. The methodology is also implemented on a multiple mode transmission concept sui for a heavy wheel loader application. It is shown that the design of the gearbox heavily influences the energy consumption and the necessity to use optimization when designing the gearbox.

  • 181.
    Pettersson, Karl
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Modular Design of Hydromechanical Transmissions for Mobile Working Machines2013In: Proceedings of the 13th Scandinavian International Conference on Fluid Power,(SICFP2013), June 3-5, 2013, Linköping, Sweden, Linköping: Linköping University Electronic Press, 2013, p. 113-119Conference paper (Refereed)
    Abstract [en]

    This paper demonstrates an optimisation-based method to design modular gearboxes scalable for a range of applications. The design is adapted to the typical operating behaviours of the reference vehicles and considers the manufacturing costs of the gearboxes. Hydromechanical continuously variable transmissions (CVTs) are today strong candidates to replace drive line transmissions based on fuel-thirsty torque converters in many mobile working machines. The advantages include wide range of torque/speed ratios, high energy efficiency throughout the speed range and decoupling of the engine speed and the vehicle speed. Advanced multiple mode CVTs, however, are difficult to evaluate early in the product development process due to the complex architectures and the great variety of possible concepts. There is consequently an increased need for methods to design, compare and evaluate the transmission concepts. To decrease the development and manufacturing costs, there is also a need for scalable transmission concepts that can be used in several applications of different classes. The results show the proficiency of the methodology compared to a manual design process and that the energy efficiency of the transmissions are heavy coupled to the designs.

  • 182.
    Pettersson, Karl
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Optimisation and Concept Sensitivity of Continuously Variable Hydromechanical Transmissions2013Conference paper (Other academic)
    Abstract [en]

    Demands for better fuel efficiency for mobile working machines motivate the manufacturers to replace existing drive transmissions with more complex, high-efficiency transmissions. Hydromechanical power-split transmissions can offer high energy efficiency throughout the speed range and allows a decoupling of the speed of the combustion engine and the vehicle speed. This paper deals with the design of complex hydromechanical power-split transmissions and suggests an optimisation-based design methodology to minimise the energy consumption and manufacturing cost of the gearbox. The methodology is applied to a multiple mode power-split transmission which is designed to suit the requirements and typical operating behaviour of a heavy wheel loader. It is shown how important the design of the transmission is to its characteristics and how manufacturing costs can be weighed against energy efficiency.

  • 183.
    Pettersson, Karl
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Volvo Construction Equipment.
    Larsson, L. Viktor
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Larsson, K. Viktor
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Simulation Aided Design and Testing of Hydromechanical Transmissions2014In: The 9th JFPS International Symposium on Fluid Power, Matsue, 2014, 2014Conference paper (Refereed)
    Abstract [en]

    This paper demonstrates the use of high-speed simulation in transmission conceptual design and presents a transmission test bed for hardware-in-the-loop simulations of hydromechanical transmission concepts. Complex transmissions, such as multiple-mode hydromechanical transmissions and hydraulic hybrid transmissions, present new difficulties and costs in the development process. There is today a greater demand for more efficient product development and more work has shifted towards simulation. The Hopsan simulation package allows robust, high-speed simulations suitable for both offline and hardware-in-the-loop simulation. New simulation models for hydromechanical transmissions are developed and used to simulate a known two-mode transmission concept. The same concept is also tested in hardware-in-the-loop simulations in the proposed transmission test bed. Results show good agreement with the hardware tests and highlight the proficiency of the simulation tools.

  • 184.
    Pettersson, Karl
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Rydberg, Karl-Erik
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Comparative Study of Multiple Mode Power Split Transmissions for Wheel Loaders2011Conference paper (Other academic)
    Abstract [en]

    To increase energy efficiency and lower emissions in construction machines, the use ofhydromechanical power split drive trains shows high potential. The possibility of usingmultiple gear speeds without losing traction force makes the power split architecture especiallysuitable for heavier wheel loaders. This paper analyses two known concepts ofmulti-mode power split transmissions suitable for the wheel loader application and comparesthe solutions based on energy efficiency. The concepts are scalable in the sense thatadditional modes can be used without necessarily adding complexity to the transmission.Simulations are made with respect to steady-state transmission losses and the relationbetween number of modes and transmission efficiency is shown for each of the proposedconcepts. The operational characteristics of the hydraulic displacement machines stronglyaffects the transmission efficiency and the design choice of number of transmissionmodes.

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  • 185.
    Pettersson, Marcus
    et al.
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Andersson (Ölvander), Johan
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Methods for Discrete Design Optimization2005In: Proceedings of ASME 31st Design Automation Conference, September 24-28, Long Beach, USA, 2005Conference paper (Other academic)
    Abstract [en]

    One area in design optimization is component based design where the designer has to choose between many different discrete alternatives. These types of problems have discrete character and in order to admit optimization an interpolation between the alternatives is often performed. However, in this paper a modified version of the non-gradient algorithm the Complex method is developed where no interpolation between alternatives is needed. Furthermore, the optimization algorithm itself is optimized using a performance metric that measures the effectiveness of the algorithm. In this way the optimal performance of the proposed discrete Complex method has been identified. Another important area in design optimization is the case of optimization based on simulations. For such problems no gradient information is available, hence non-gradient methods are therefore a natural choice. The application for this paper is the design of an industrial robot where the system performance is evaluated using comprehensive simulation models. The objective is to maximize performance with constraints on lifetime and cost, and the design variables are discrete choices of gear boxes for the different axes.

  • 186.
    Pettersson, Marcus
    et al.
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Andersson (Ölvander), Johan
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    On Optimal Drive Train Design in Industrial Robots2005In: Proceedings of IEEE International Conference on Industrial Technology, Hong Kong, December 2005, 2005, p. 254-259Conference paper (Other academic)
    Abstract [en]

    In this paper optimization is used to determine which gearboxes to use in an industrial robot. The paper also presents a procedure where tradeoff information is generated based on consecutive optimizations. Thereby the method provides the designer with information about critical tradeoffs between conflicting objectives. This type of information is very valuable when negotiating between different design alternatives. Generating these tradeoffs is traditionally a time consuming process, but by introducing optimization this process can be partly automated. The design variables studied are composed of continuous and discrete parameters, where the latter are associated with different gearbox alternatives and the continuous variables with the speed-torque limitation of the gearboxes. A non-gradient based optimization algorithm which can handle mixed variables problems is used to solve the highly non-linear problem. The outcome from an industrial point of view is minimization of cost and simultaneously balance the trade-off between lifetime and performance.

  • 187.
    Pettersson, Marcus
    et al.
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Andersson (Ölvander), Johan
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Wäppling, D.
    Feng, Xiaolong
    Linköping University, Department of Management and Engineering, Machine Design . Linköping University, The Institute of Technology.
    Industrial Robot Design Optimization in the Conceptual Design Phase2004In: Proceedings of IEEE International Conference on Mechatronics and Robotics, Aachen , Germany, 2004Conference paper (Other academic)
  • 188.
    Pohl, Jochen
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Working Principles of Variable Valve Actuation2000Report (Other academic)
  • 189.
    Pohl, Jochen
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Rydberg, Karl-Erik
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Thermal Aspects in Lubrication System Design for Internal Combustion Engines2000In: International Conference on Thermal Process Modelling Computer Simulation,2000, Shanghai: ICTPMCS , 2000, p. 332-341Conference paper (Refereed)
    Abstract [en]

      

  • 190.
    Pohl, Jochen
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Sethson, Magnus
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Modelling and Simulation of a Fast 2/2 Switching Valve for Hydraulic Valve Train Applications2000Report (Other academic)
    Abstract [en]

          

  • 191.
    Pohl, Jochen
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems .
    Sethson, Magnus
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems .
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems .
    Modelling and validation of a fast switching valve intended for combustion engine valve trains2002In: Proceedings of the Institution of mechanical engineers. Part I, journal of systems and control engineering, ISSN 0959-6518, E-ISSN 2041-3041, Vol. 216, no 2, p. 105-116Article in journal (Refereed)
    Abstract [en]

    In recent years much research has been done in the area of variable-valve actuation in order to improve the efficiency of combustion engines. Currently, a number of different concepts for variable-valve actuation are under development or at a prototype stage. Hydraulic actuation has been an obvious candidate, but the lack of sufficiently fast switching valves with appropriate flowrates has been the major shortcoming. Design of such highly dynamic systems requires accurate models of the actual included components. In this paper a model of a fast 2/2 switching valve is presented, where both the magnetic path as well as the spool assembly are modelled. The model presented here is primarily aimed at system simulations, therefore it has to be kept simple with the number of parameters low. Some of the parameters are often hard to obtain, especially when it comes to magnetic material properties. In this study, an optimization strategy has been utilized in order to parameterize the model against measured data. However, even for major deviations from the operational point used for the model adaptation, the model predicts the valve response sufficiently accurately.

  • 192.
    Pohl, Jochen
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Warell, Anders
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Palmberg, Jan-Ove
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    The use of Simulation Driven Experiments for the Conceptual Design of a Variable Valve Train2000Report (Other academic)
    Abstract [en]

         

  • 193.
    Raduenz, Henrique
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Ericson, Liselott
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Heybroek, Kim
    Volvo Construction Equipment.
    De Negri, Victor J.
    Universidade Federal de Santa Catarina.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Improving the efficiency of valve-controlled systems by using multi-chamber actuators2021In: Proceedings of the 17:th Scandinavian International Conference on Fluid Power, SICFP’21, June 1-2, 2021, Linköping, Sweden, 2021, p. 224-236Conference paper (Refereed)
    Abstract [en]

    This paper outlines how multi-chamber actuatorscan improve the efficiency of valve-controlled systems.Resistive control is a major source of energy losses invalve-controlled systemsthat share the same pumpto drive multiple loads. In the proposed concept, by selectingdifferent chambers,the load on the multi-chamber actuator can be transformed into different pressure and flow rate levels, allowingthe adaptation of its load to the loads on otheractuators. Thiscan lead to a reduction of resistive control energy losses that occur between pump and actuatorswhen driven simultaneously.Suchsystemsareseen as an intermediate solution between resistive conventionalhydraulics and throttle-less digital hydraulics. As a casestudyto highlight the possible efficiency improvement, a concept of a load sensing system with a conventional and a multi-chamber actuatoris analysed. To determine itsefficiency,the equations that describe its static behaviour are presented. Evaluating them for a set ofload forces and speeds demonstrates how the load transformation occursand how it canimprove efficiency.

  • 194.
    Raduenz, Henrique
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Ericson, Liselott
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Uebel, Karl
    Volvo Construction Equipment.
    Heybroek, Kim
    Volvo Construction Equipment.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    De Negri, Victor J.
    Universidade Federal de Santa Catarina.
    Energy Management Based on Neural Networks for a Hydraulic Hybrid Wheel Loader2020In: 2020 IEEE Global Fluid Power Society PhD Symposium, 2020Conference paper (Refereed)
    Abstract [en]

    This paper presents a method to derive optimized energy management strategies for a hydraulic hybrid wheel loader. Energy efficiency is a key aspect for the sustainability of off-road mobile machines. Energy management strategies for on-road hybrid vehicles cannot be directly applied to off-road hybrid machines. One significant reason is that there are added degrees of freedom with respect to how power can be recovered, exchanged and reused in the different functions, such as drivetrain or work functions. This results in more complex energy management strategies being derived. This paper presents an analysis and preliminary conclusions for a proposed method to derive optimised online energy management strategies for a hydraulic hybrid wheel loader. Dynamic programming is used to obtain optimal offline energy management strategies for a series of drive cycles. The results are used as examples to train a neural network. The trained neural network then implements the energy management strategy and is used to make optimised control decisions. Through simulation, the neural network’s ability to learn the dynamic programming decision-making process is shown, resulting in the machine operating with fuel consumption similar to that of the offline optimal energy management strategy. Aspects of simplicity to model these machines for dynamic programming optimisation, the data necessary to train the network, the training process, variables used to learn the dynamic programming decision-making process and the robustness of the network when facing unseen operational conditions are discussed. The paper demonstrates the simplicity of the method for taking into account variables that affect the control decisions, therefore achieving optimised solutions.

  • 195.
    Raduenz, Henrique
    et al.
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Uebel, Karl
    Volvo Construction Equipment, Eskilstuna, Sweden.
    Heybroek, Kim
    Volvo Construction Equipment, Eskilstuna, Sweden.
    Ericson, Liselott
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    De Negri, Victor
    Federal University of Santa Catarina, Laboratory of Hydraulic and Pneumatic Systems, Florianópolis, Brazil.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Rule- and Neural Network-based Energy Management for a Hydraulic HybridWheel Loader2022In: 13th International Fluid Power Conference AachenFluid Power: Digital, Reliable, Sustainable / [ed] Katharina Schmitz, 2022, p. 828-841Conference paper (Refereed)
    Abstract [en]

    This paper highlights the importance of considering required control rules from the real-world implementation inoffline optimal control optimisations used to generate online energy management strategies (EMS). The controlrules are constraints on the optimal control problem. If not considered, the control optimisation results do notrepresent the reality and the EMS will have poor performance. In this paper, a neural network predicts the optimalcontrol decisions whenever the rules are not taking place. It is a rule- and neural network-based energymanagement strategy. A limitation to the use of neural networks as part of the EMS is that they do not ensurestable behaviour outside the region they were trained for. In the real application – in this case, a hybrid wheelloader – they will be deployed alongside control rules to ensure safety and reasonable operation. Hence theimportance of implementing the rules in the optimal control problem. Results show that better performance of theEMS is achieved if the rules from the application are considered in the optimal control problem.

  • 196.
    Safavi, Edris
    et al.
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Chaitanya, Raghu
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Ölvander, Johan
    Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
    Multidisciplinary Optimization of Aircraft Vehicle System for Conceptual Analysis2013In: , Aerospace Research Central, ARC , 2013, p. 1-9Conference paper (Other academic)
    Abstract [en]

    An aircraft is a multifaceted product which requires cooperation between different engineering domains. Therefore, design of an aircraft is essentially a multidisciplinary activity with necessity of integrating dierent design tools to get an optimized product. At Linkoping University, a design framework is being developed to assist in the evaluation and optimization of various aircraft vehicle system architectures with the help of integrating a geometric, aerodynamic and dynamic models early in the conceptual design phase. This framework helps to identify a preliminary system concept for an energy optimized aircraft architecture with the focus on more electrical aircraft. As a case study the performance and geometrical aspects of an EMA (Electromechanical actuator) are evaluated and optimized.

  • 197.
    Schön, Sofia
    et al.
    Linköping University, Department of Management and Engineering, Product Realisation. Linköping University, Faculty of Science & Engineering.
    Knöös Franzén, Ludvig
    Linköping University, Faculty of Science & Engineering. Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems.
    Staack, Ingo
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Krus, Petter
    Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
    Marcus, Carina
    Saab Aeronautics, Linköping, Sweden.
    Amadori, Kristian
    Saab Aeronautics, Linköping, Sweden.
    Jouannet, Christopher
    Saab Aeronautics, Linköping, Sweden.
    Exploring the Impact of Model Fidelity Through Interactive Visualizations for System of Systems2022In: AIAA SciTech 2022 Forum, January 3-7, 2022, San Diego, CA & Virtual, USA: American Institute of Aeronautics and Astronautics, 2022Conference paper (Refereed)
    Abstract [en]

    Studying Systems of Systems (SoS) in relation to Measures of Effectiveness (MoE) is a difficult task. This is due to that SoSs include several system levels and operate in changing environments. There are also computational challenges related to modeling and simulation of SoSs and it is difficult to predict behaviors. Therefore, choosing model fidelity for system models and assessing their impact on MoE is of high relevance to the field. This paper illustrates an approach to modeling and simulation for SoSs that can be used to assess the impact of scenario parameters and to explore when level of fidelity on system level affects the MoE. This is made through a case study based on Search and Rescue (SAR) operations where a Design Of Experiments (DOE) of scenario parameters is performed and simulations of each scenario experiment is performed. The case study shows how Agent Based Simulations (ABS) can be used to obtain the MoE for different SAR missions and how the choice of model fidelity for one of the aircraft’s sensors has different effects for various scenarios. Additionally, a Visual Analytics (VA) approach is introduced and used to create a dashboard for visualizing the obtained simulation results in an interactive way. This allows users to make explorations on the resulting data and see how different scenarios influence the performance of each SoS. Furthermore, the results show that changes in scenario parameters impacts the MoE and that this is difficult to predict, at least using a quantitative method. The results point to the importance of exploration for both the scenario, using an interactive dashboard, but also to the importance of exploring the simulation model to study emerging phenomenon. The results of this approach have raised questions regarding if a more qualitative approach of studying SoSs could be beneficial to study MoE for SoSs and if inspiration could be transferred from a more scientific point of view of systems.

  • 198.
    Schütte, Simon
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Management and Engineering, Machine Design .
    Eklund, Jörgen
    KTH.
    Integration of Affective Engineering in Product Development Processes2008In: Second First European Conference of Kansei Engineering,2008, Helsingborg: Kansei Engineering , 2008Conference paper (Refereed)
    Abstract [en]

      

  • 199.
    Sethson, Magnus
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Karlsson, M.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Neuro-mechanical networks as an architecture for system design2004In: AAAAI-Synthesis,2003, Stanford, USA: AAAI , 2004Conference paper (Refereed)
    Abstract [en]

      

  • 200.
    Sethson, Magnus
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Fluid and Mechanical Engineering Systems.
    Krus, Petter
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Machine Design.
    Karlsson, M.
    Simulation of s, in selforganizing structures using neuro mechanical networks2004In: European Simulation Multi-Conference,2003, Nottingham, UK: ESM2003 , 2004Conference paper (Refereed)
    Abstract [en]

        

12345 151 - 200 of 217
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