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  • 1.
    Derelöv, Micael
    Linköpings universitet, Tekniska högskolan. Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik.
    An Approach to Verification and Evaluation of Early Conceptual Design Solutions2002Inngår i: Design 2002,2002, Zagreb: Faculty of Mechanical Engineering an dNaval Architecture, The Design Society , 2002, s. 125-Konferansepaper (Fagfellevurdert)
  • 2.
    Derelöv, Micael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    An Approach to Verification and Evaluation of Early ConceptualDesign Solutions2002Inngår i: Proceeding of 7th International Design Conference - Design, Dubrovnik, 2002, s. 125-130Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In the eartly phases of the design process the evaluation and the following decision-making are based on limited amountof information, nevertheless the decision will determine the direction of the remaining design process. The objektivewith this paper is to present a way of representing the conceptual solutions, which facilitate an enhance utilisation of theavalible information. Based on the systems theory, a widening and more nuanced definition of the conception ofrelationship is being established, which implies an increased possibility of describing properties origin from theinteraction between elements. The proposed representation should be considered as a first step towards a moreelaborated methodology.

  • 3.
    Derelöv, Micael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    Identification of Potential Failure: On Evaluation of ConceptualDesign2009Inngår i: Journal of engineering design (Print), ISSN 0954-4828, E-ISSN 1466-1837Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    ldentifying and attending to faults and shortcomings in the design before it reaches the market is crucial in order to achieve a profitable product. Letting the customer detect the shortcomings in the design is not an acceptable approach today, and will inevitably lead to unsatisfied costumers. Activities aimed at identifying faults in the product may becarried out during the entire design process, but faults identified late in the design process will require more resources to put right, and may affect the performance negatively to a higher degree than faults identified upstream in the process. This article aims to develop the theory and methodology regarding identification of potential failures in a system upstream from the design process. The result presented in this article comprises a method for modelling failuresand a process for identirying potential failures in conceptual solutions. The result is based onqualitative system modelling, where the known physical phenomena are compared to the system in order to evaluate the potential of different behaviour occurring. The effects the behaviour emits determine its impact on the system, and thus the potential for a failure. The article concludes with a comprehensive example demonstrating, and to some extend verirying, the method of identifying potential failures.

  • 4.
    Derelöv, Micael
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    On conceptual design reliability: an approach for identification of potential failures2004Licentiatavhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    This thesis is the result of research in the area of Evaluation and Decision-Making in the Design Process. It examines how to support and facilitate the evaluation activities in the design process in order to create a more solid foundation on which to base design decisions. The focus, however, is not on decision-making in general, but primarily on how the technical feasibility and reliability of a conceptual solution may be estimated with a higher degree of certainty.

    The current tools and methods for determine the feasibility and reliability are mostly passive, i.e. they prescribe how to proceed and do not actively contribute to the result. There is need for tools and methods that take a more active part in the process, and that may convey experience about feasibility and reliability from former designs.

    The objectives with this research are to acquire knowledge about how and in what ways failures occur in a product and how they may be modelled in order to increase the understanding of them; and to develop a methodology that utilises the knowledge about the failure phenomena in order to identify and avoid problems in the solutions.

    The research approach is mainly explorative and is based on several case studies and observations. In the case studies, the failure phenomena are examined both qualitatively and quantitatively from different perspectives. In the observations, insight and experience in the usability and shortcomings of prevalent evaluation and reliability methods are gathered.

    The results may be divided into two parts, one descriptive and one prescriptive part. The descriptive result consists of a phenomena model capable of explaining the appearance of failures in a system. The phenomena model is based on the results and the conclusions from the case studies and the observations, and has given rise to an enhanced system model. The main conclusion from the descriptive part is that the detection of potential failures in a system is largely a question of identifying the potentials for different physical phenomenon to occur in the system, and to determine which effects the physical phenomenon will give rise to.

    The prescriptive results consist mainly of an information model for failure identification, from which a failure identification process has been extracted. The fundamentals of the process are to describe the behaviour in the system by searching for effects from physical phenomena, and to determine how these effects affect the functionality. The process is to some extent verified by a comprehensive example.

  • 5.
    Derelöv, Micael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    On Evaluation of Design Concepts: Modelling Approaches for Enhancing the Understanding of Design Solutions2009Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This dissertation embraces the issue of evaluating design concepts. Being able to sort out the potential“best solutions” from a set of solutions is a central and important part of the design process. The subjectdiscussed in this dissertation has its origins in the lack of knowledge about design concepts, somethingwhich is characteristic of the initial part of the design process and which frequently causes problems whenit comes to evaluation and selection of solutions. The purpose of this dissertation is to develop aids andmethods that enhance the understanding of design concepts in the early phases of the design process.

    From deductive reasoning about the fundamental mechanisms of the evaluation activity, the work hasbeen divided into three different areas: process and system modelling, concept optimisation, andidentification of potential failures.

    The bearing of the work within the area of process and system modelling has a verifying character. Theobjective of the work has been to analyse how established design methodology, which has its commonapplications within traditional engineering industry, may be applied within an area that is characterised bymore multidisciplinary interfaces, like biotechnology. The result of a number of case studies, in whichdifferent types of biotechnical systems where analysed and modelled, shows that the methodology isapplicable even for biotechnical products. During the work the methodology has also been furtherelaborated on in order to better suit the distinguishing characteristics exhibited in the development ofbiotechnical systems.

    Within the area of concept optimisation, an approach for optimising the concept generation has beenelaborated. By formalising the step in both concept generation and evaluation, it has been possible toapply genetic algorithms in order to optimise the process. The work has resulted in a model thatautomatically creates and sorts out a number of potential solutions from a defined solution space and adefined set of goals.

    The last area, which deals with identification of potential failures, has resulted in a rather novel way toconsider and model the behaviour of a system. The approach is an elaboration of the modellingtechniques within system theory, and deduces the system’s behaviour from known physical phenomenaand the system’s ability to effectuate them. The way the different behaviours interact with one another, byaffecting the properties of the system, determines the potential for a failure to occur. A “failure”,according to the model, is described as an unintended behaviour which obstructs the system’sfunctionality, i.e. which affects the conditions of a desired behaviour.

    The dissertation has resulted in three different means for approaching the difficulties associated with theevaluation of design concepts. The means are applicable during different parts of the design process, butthey all address the same issue, viz. to enhance the understanding of the design solutions.

    Delarbeid
    1. Engineering Design Methodology for Bio-Mechatronic Products
    Åpne denne publikasjonen i ny fane eller vindu >>Engineering Design Methodology for Bio-Mechatronic Products
    2008 (engelsk)Inngår i: Biotechnology progress (Print), ISSN 8756-7938, E-ISSN 1520-6033, Vol. 4, nr 1, s. 232-244Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Four complex biotechnology products/product systems (a protein purification system, a bioreactor system, a surface plasmon resonance biosensor, and an enzymatic glucose analyzer) are analyzed using conceptual design principles. A design model well-known in mechanical system design, the Hubka-Eder (HE) model, is adapted to biotechnology products that exemplify combined technical systems of mechanical, electronic, and biological components, here referred to as bio-mechatronic systems. The analysis concludes that an extension of the previous HE model with a separate biological systems entity significantly contributes to facilitating the functional and systematic analyses of bio-mechatronic systems.

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-21068 (URN)10.1021/bp0701822 (DOI)
    Tilgjengelig fra: 2009-09-28 Laget: 2009-09-28 Sist oppdatert: 2019-01-22bibliografisk kontrollert
    2. PAT and design science
    Åpne denne publikasjonen i ny fane eller vindu >>PAT and design science
    2007 (engelsk)Inngår i: European Pharmaceutical Review, nr 3, s. 74-80Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Process analyties. technology (PAT) and mechanical design science are interconnected. This article describes how a well-established design modelling approach. The Hubka-Eder model, is applied to the concepis of PAT end quality by design (QBD). The model connects PAT With quality management concepts as defined for PAT by lhe ICH guldelines for quaiity issues. Examples are taken fom biopharmaceutical applications. but lhese are also applicable to other pharmaceutical ingredients (API). Benefits of using a conceptual design modelling approach on PAT and related subjects are discussed and suggestecl as a complementary functionality analysis tool in PAT and quality design pharmaceutical processes.

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-21073 (URN)
    Tilgjengelig fra: 2009-09-28 Laget: 2009-09-28 Sist oppdatert: 2019-01-22bibliografisk kontrollert
    3. Supporting concept synthesis by use of genetic algorithms
    Åpne denne publikasjonen i ny fane eller vindu >>Supporting concept synthesis by use of genetic algorithms
    2004 (engelsk)Inngår i: Tools and Methods of Competitive Engineering, Proceedings Fifth International Symposium on Tools and Methods of Competitive Engineering / [ed] Horvath, I; Xirouchakis, P, Rotterdam: Milpress , 2004, s. 255-266Konferansepaper, Publicerat paper (Annet vitenskapelig)
    Abstract [en]

    Evolutionary algorithms are common in parameter optimisation of a given solution. Conceptual design, however, initially involves finding a principle solution, and a bad principle choice can hardly be compensated by even the best detail design and parameter optimisation. This article therefore describes an approach to apply agenetic algorithm for concept synthesis by modelling principle choices as weil as their parameter values and treating both asoptimisation variables. The results are three alternative genome representations (of which a tree genome finally was chosen), algorithms for crossover and mutation operating on the tree genome and an evaluation strategy including weighted sum assessment over multiple criteria (conjunctive selection) as weil as meclhanisms that favour (disjunctive selection) or penalise (disjunctive elimination) concepts performing well or bad in one criterion respectively. The first task was to develop the method, which is also the focus of this article. Testing it in case studies in order to assess the effectiveness and practical applicability remains as a subsequent task. It can though be concluded that the presented approach fulfils its purpose, as it is capable of modelling the choice of the right principle solution during conceptual design.

    sted, utgiver, år, opplag, sider
    Rotterdam: Milpress, 2004
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-21078 (URN)90-5966-018-8 (ISBN)
    Konferanse
    Fifth International Symposium on Tools and Methods of Competitive Engineering, Lausanne, Switzerland, April 13 - 17, 2004
    Tilgjengelig fra: 2009-09-28 Laget: 2009-09-28 Sist oppdatert: 2012-11-30bibliografisk kontrollert
    4. An Approach to Verification and Evaluation of Early ConceptualDesign Solutions
    Åpne denne publikasjonen i ny fane eller vindu >>An Approach to Verification and Evaluation of Early ConceptualDesign Solutions
    2002 (engelsk)Inngår i: Proceeding of 7th International Design Conference - Design, Dubrovnik, 2002, s. 125-130Konferansepaper, Publicerat paper (Fagfellevurdert)
    Abstract [en]

    In the eartly phases of the design process the evaluation and the following decision-making are based on limited amountof information, nevertheless the decision will determine the direction of the remaining design process. The objektivewith this paper is to present a way of representing the conceptual solutions, which facilitate an enhance utilisation of theavalible information. Based on the systems theory, a widening and more nuanced definition of the conception ofrelationship is being established, which implies an increased possibility of describing properties origin from theinteraction between elements. The proposed representation should be considered as a first step towards a moreelaborated methodology.

    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-21081 (URN)
    Tilgjengelig fra: 2009-09-28 Laget: 2009-09-28 Sist oppdatert: 2009-09-28bibliografisk kontrollert
    5. Qualitative Modelling of Potential Failure: On Evaluation ofConceptual Design
    Åpne denne publikasjonen i ny fane eller vindu >>Qualitative Modelling of Potential Failure: On Evaluation ofConceptual Design
    2008 (engelsk)Inngår i: Journal of engineering design (Print), ISSN 0954-4828, E-ISSN 1466-1837, Vol. 19, nr 3, s. 201-225Artikkel i tidsskrift (Fagfellevurdert) Published
    Abstract [en]

    Decisions made during the conceptual phase of the design process are crucial for long-term economic success. The correction of late-identified failure is often both difficult and time consuming, and may have a negative effect on performance. In the prevalent design methodologies, there are shortages concerning systematic and objective methods to evaluate solutions with respect to weak spots and errors, especially early in the design process. The objective of this article is to strengthen the evaluation methodology by examining the possibilities to identify potential problems within conceptual solutions, and to develop a means that facilitates the evaluation regarding this matter. The results presented in this article may be divided into two parts: a descriptive part where a generic approach of modelling the failure behaviour is proposed and a prescriptive part where a foundation of a methodology for identification of potential failure is outlined.

    sted, utgiver, år, opplag, sider
    Abingdon, Oxfordshire, United Kingdom: Taylor & Francis, 2008
    Emneord
    Concept; Evaluation; Failure; Methodology; Reliability
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-21082 (URN)10.1080/09544820701255858 (DOI)000254947400002 ()
    Tilgjengelig fra: 2009-09-28 Laget: 2009-09-28 Sist oppdatert: 2017-12-13bibliografisk kontrollert
    6. Identification of Potential Failure: On Evaluation of ConceptualDesign
    Åpne denne publikasjonen i ny fane eller vindu >>Identification of Potential Failure: On Evaluation of ConceptualDesign
    2009 (engelsk)Inngår i: Journal of engineering design (Print), ISSN 0954-4828, E-ISSN 1466-1837Artikkel i tidsskrift (Annet vitenskapelig) Submitted
    Abstract [en]

    ldentifying and attending to faults and shortcomings in the design before it reaches the market is crucial in order to achieve a profitable product. Letting the customer detect the shortcomings in the design is not an acceptable approach today, and will inevitably lead to unsatisfied costumers. Activities aimed at identifying faults in the product may becarried out during the entire design process, but faults identified late in the design process will require more resources to put right, and may affect the performance negatively to a higher degree than faults identified upstream in the process. This article aims to develop the theory and methodology regarding identification of potential failures in a system upstream from the design process. The result presented in this article comprises a method for modelling failuresand a process for identirying potential failures in conceptual solutions. The result is based onqualitative system modelling, where the known physical phenomena are compared to the system in order to evaluate the potential of different behaviour occurring. The effects the behaviour emits determine its impact on the system, and thus the potential for a failure. The article concludes with a comprehensive example demonstrating, and to some extend verirying, the method of identifying potential failures.

    Emneord
    Concept, Evaluation, Failure, Methodology, Reliability
    HSV kategori
    Identifikatorer
    urn:nbn:se:liu:diva-21083 (URN)
    Tilgjengelig fra: 2009-09-28 Laget: 2009-09-28 Sist oppdatert: 2017-12-13bibliografisk kontrollert
  • 6.
    Derelöv, Micael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    Qualitative Modelling of Potential Failure: On Evaluation ofConceptual Design2008Inngår i: Journal of engineering design (Print), ISSN 0954-4828, E-ISSN 1466-1837, Vol. 19, nr 3, s. 201-225Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Decisions made during the conceptual phase of the design process are crucial for long-term economic success. The correction of late-identified failure is often both difficult and time consuming, and may have a negative effect on performance. In the prevalent design methodologies, there are shortages concerning systematic and objective methods to evaluate solutions with respect to weak spots and errors, especially early in the design process. The objective of this article is to strengthen the evaluation methodology by examining the possibilities to identify potential problems within conceptual solutions, and to develop a means that facilitates the evaluation regarding this matter. The results presented in this article may be divided into two parts: a descriptive part where a generic approach of modelling the failure behaviour is proposed and a prescriptive part where a foundation of a methodology for identification of potential failure is outlined.

  • 7.
    Derelöv, Micael
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    Detterfelt, Jonas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    Björkman, Mats
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    Mandenius, Carl-Fredrik
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Engineering Design Methodology for Bio-Mechatronic Products2008Inngår i: Biotechnology progress (Print), ISSN 8756-7938, E-ISSN 1520-6033, Vol. 4, nr 1, s. 232-244Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Four complex biotechnology products/product systems (a protein purification system, a bioreactor system, a surface plasmon resonance biosensor, and an enzymatic glucose analyzer) are analyzed using conceptual design principles. A design model well-known in mechanical system design, the Hubka-Eder (HE) model, is adapted to biotechnology products that exemplify combined technical systems of mechanical, electronic, and biological components, here referred to as bio-mechatronic systems. The analysis concludes that an extension of the previous HE model with a separate biological systems entity significantly contributes to facilitating the functional and systematic analyses of bio-mechatronic systems.

  • 8.
    Gopinath, Varun
    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.
    Derelöv, Micael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Demonstrators to support research in Industrial safety - A Methodology2018Inngår i: 28TH INTERNATIONAL CONFERENCE ON FLEXIBLE AUTOMATION AND INTELLIGENT MANUFACTURING (FAIM2018): GLOBAL INTEGRATION OF INTELLIGENT MANUFACTURING AND SMART INDUSTRY FOR GOOD OF HUMANITY, ELSEVIER SCIENCE BV , 2018, Vol. 17, s. 246-253Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Activities to support manufacturing research are carried out with the intention to gain knowledge of industrial problems and provide solutions that addresses these issues. In order for solution to be viable to the industry, research activities are carried out in close collaboration with participants from the industry, academia and research institutions. Interactive research approach motivates participants with multi-disciplinary perspective to collaborate and emphasizes joint learning in the change process. This article, presents a methodology, where participants with different expertise can collaborate to develop safety solutions. The concept of a demonstrator, which represents cumulative result of a series of research activities, is presented as a tool to showcase functioning and design intent in a collaborative research environment. The results of a pilot study, where manufacturing professionals evaluated design decisions that resulted in a demonstrator, will be presented. (C) 2018 The Authors. Published by Elsevier B.V.

  • 9.
    Johansson, Cristina
    et al.
    Mendeley, Br€oderna Ugglasgatan, SE-582 54 Linköping, Sweden.
    Derelöv, Micael
    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.
    How to use an Optimization-based Method Capable of Balancing Safety, Reliability, and Weight in an Aircraft Design Process2017Inngår i: Nuclear engineering and technology : an international journal of the Korean Nuclear Society, ISSN 1738-5733, E-ISSN 2234-358X, Vol. 49, s. 404-410Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In order to help decision-makers in the early design phase to improve and make more cost-efficient system safety and reliability baselines of aircraft design concepts, a method (Multi-objective Optimization for Safety and Reliability Trade-off) that is able to handle trade-offs such as system safety, system reliability, and other characteristics, for instance weight and cost, is used. Multi-objective Optimization for Safety and Reliability Trade-off has been developed and implemented at SAAB Aeronautics. The aim of this paper is to demonstrate how the implemented method might work to aid the selection of optimal design alternatives. The method is a three-step method: step 1 involves the modelling of each considered target, step 2 is optimization, and step 3 is the visualization and selection of results (results processing). The analysis is performed within Architecture Design and Preliminary Design steps, according to the company’s Product Development Process. The lessons learned regarding the use of the implemented trade-off method in the three cases are presented. The results are a handful of solutions, a basis to aid in the selection of a design alternative. While the implementation of the trade-off method is performed for companies, there is nothing to prevent adapting this method, with minimal modifications, for use in other industrial applications.

  • 10.
    Johansson, Cristina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska fakulteten.
    Derelöv, Micael
    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.
    Bergstrom, B.
    SAAB Aeronaut, Linkoping, Sweden.
    Nilsson-Sunden, H.
    SAAB Aeronaut, Linkoping, Sweden.
    An industrial implementation of an optimization based method for balancing safety, reliability and weight of aircraft systems2017Inngår i: RISK, RELIABILITY AND SAFETY: INNOVATING THEORY AND PRACTICE, CRC PRESS-TAYLOR & FRANCIS GROUP , 2017, s. 1707-1713Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The aim of this paper is to show how a method able of trade-offs such as system safety, reliability, weight and cost can be practically implemented in industry (SAAB Aeronautics). The scope is to facilitate the decision-making on the optimal design in early design phases. The method consists of several steps guiding the user to model each objective, verify and validate the models, perform optimization and finally visualize and select the results. Within the practical implementation of this method, several challenges are addressed and solved. For example, one challenge is to implement the trade-off method using the existing programs. Another challenge is the user friendliness of the implementation. In order to solve these challenges, the analysis is started and performed in Matlab. A Graphical User Interface guides the user to select the analysis to perform, budgets/requirements for each objective and parameters with influence on end-result. Data regarding the safety and reliability objectives, exported from Reliability Workbench program to Excel, is imported to Matlab, where the analysis is performed. The results are extracted into an Excel file, where the user can work further on visualization and selection. Two small examples are used to demonstrate this practical implementation of the trade-off method. Lessons learned are presented, strengths, limitations and development potential.

  • 11.
    Johansson, Cristina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Derelöv, Micael
    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.
    Bergström, B.
    SAAB Aeronautics, Linköping, Sweden.
    Nilsson-Sundén, H.
    SAAB Aeronautics, Linköping, Sweden.
    An Industrial Implementation of an Optimization Based Method for Balancing Safety, Reliability and Weight of Aircraft Systems2017Inngår i: Risk, Reliability and Safety: Innovating Theory and Practice: Proceedings of ESREL 2016 (Glasgow, Scotland, 25-29 September 2016) / [ed] Lesley Walls, Matthew Revie and Tim Bedford, CRC Press, 2017, s. 1707-1713Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The aim of this paper is to show how a method able of trade-offs such as system safety, reliability, weight and cost can be practically implemented in industry (SAAB Aeronautics). The scope is to facilitate the decision-making on the optimal design in early design phases. The method consists of several steps guiding the user to model each objective, verify and validate the models, perform optimization and finally visualize and select the results. Within the practical implementation of this method, several challenges are addressed and solved. For example, one challenge is to implement the trade-off method using the existing programs. Another challenge is the user friendliness of the implementation. In order to solve these challenges, the analysis is started and performed in Matlab. A Graphical User Interface guides the user to select the analysis to perform, budgets/requirements for each objective and parameters with influence on end-result. Data regarding the safety and reliability objectives, exported from Reliability Workbench program to Excel, is imported to Matlab, where the analysis is performed. The results are extracted into an Excel file, where the user can work further on visualization and selection. Two small examples are used to demonstrate this practical implementation of the trade-off method. Lessons learned are presented, strengths, limitations and development potential.

  • 12.
    Johansson, Cristina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan. Saab Aeronautics, Linköping, Sweden.
    Persson, Per
    Saab Aeronautics, Linköping, Sweden.
    Derelöv, Michael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Choosing the reliability approach: A guideline for selecting the appropriate reliability method in the design process2013Inngår i: Proceedings of the 20th Advances in Risk and Reliability Technology Symposium 21–23 May 2013 / [ed] Lisa Jackson and John Andrews, Loughborough: Loughborough University, UK , 2013, s. 366-378Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    The main objective of a reliability study should always be to provide information as a basis for decisions, e.g. concept choice, design requirements, investment, choice of suppliers, design changes or guaranty claims. The choice of reliability method depends on the time allocated for the reliability study, the design stage, the problem at hand and the competence and resources available.

    During a reliability study the engineer focuses on providing a graphical means of evaluating the relationships between different parts of the system, gathering or assessing the reliability data for the components and interpreting the results of the analyses. Even though the commercial software tools available claim to provide answers to most reliability questions, choosing which method is best suited is not an easy task. Often several methods can be applied and none of them will fit the purpose perfectly.

    This paper presents a guideline for choosing the best suited reliability method in early design phases from two aspects: objective and system characteristics. The methods studied are the most common methods available in commercial software tools: Reliability Block Diagram (RBD), Fault Tree (FT), Event Tree (ET), Markov Analysis (MA) and Stochastic Petri Network (SPN). The guideline considers two aspects: the characteristics of the system studied and the scope of the analysis. The applicability of each of the five chosen methods is assessed for all possible combinations of system characteristics and objective. A study has been made at Saab Aeronautics to evaluate the practical use of the analysed methods and how this guideline can improve the selection of appropriate reliability methods in early design phases.

  • 13.
    Johansson, Cristina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan. Saab Aeronautics, Linköping, Sweden.
    Persson, Per
    Saab Aeronautics, Linköping, Sweden.
    Derelöv, Michael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Cost optimization with focus on reliability and system safety2013Inngår i: Safety, Reliability and Risk AnalysisBeyond the Horizon / [ed] R. D. J. M. Steenbergen , P. H. A. J. M. van Gelder , S. Miraglia and A. C. W. M. Ton. Vrouwenvelder, CRC Press, 2013, s. 2723-2730Konferansepaper (Fagfellevurdert)
    Abstract [en]

    When developing a safety critical system, there are many aspects that need to be balanced against each other in order to reach an optimal design such as safety requirements, reliability goal, performance specifications and budget constraints. In an early design stage, it is vital to be able to screen the design space for a set of promising design alternatives for further studies. This paper proposes an approach capable of investigating the trade-offs described above, combining the techniques for system safety and reliability analysis with optimization methods. Markov analysis is employed for modeling the system safety and reliability characteristics and a Genetic Algorithm is used for optimization. The proposed method is applied to the design of an electric supply system for an aircraft, involving selection of components from different suppliers. First a model is built for each objective, i.e. cost, safety, and reliability. The models are validated and optimization is performed. The obtained result is the selection of suppliers for each component in the system in order to achieve a balance between system safety, reliability, and other design objectives.

  • 14.
    Johansson, Cristina
    et al.
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska fakulteten. Saab Dynam, Linkoping, Sweden.
    Ölvander, Johan
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Derelöv, Micael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Maskinkonstruktion. Linköpings universitet, Tekniska fakulteten.
    Multi-objective optimization for safety and reliability trade-off: Optimization and results processing2018Inngår i: Journal of Risk and Reliability, ISSN 1748-006X, E-ISSN 1748-0078, Vol. 232, nr 6, s. 661-676Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In early design phases, it is vital to be able to screen the design space for a set of promising design alternatives for further study. This article presents a method able to balance several objectives of different mathematical natures, with high impact on the design choices. The method (MOSART) handles multi-objective optimization for safety and reliability trade-offs. The article focuses on optimization problem approach and processing of results as a base for decision-making. The output of the optimization step is the selection of specific system elements obtaining the best balance between the targets. However, what is a good base for decision can easily transform into too much information and overloading of the decision-maker. To solve this potential issue, from a set of Pareto optimal solutions, a smaller sub-set of selected solutions are visualized and filtered out using preference levels of the objectives, yielding a solid base for decision-making and valuable information on potential solutions. Trends were observed regarding each system element and discussed while processing the results of the analysis, supporting the decision of one final best solution.

  • 15.
    Mandenius, Carl-Fredrik
    et al.
    Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska högskolan.
    Derelöv, Micael
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    Detterfelt, Jonas
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    Björkman, Mats
    Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Monteringsteknik. Linköpings universitet, Tekniska högskolan.
    PAT and design science2007Inngår i: European Pharmaceutical Review, nr 3, s. 74-80Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Process analyties. technology (PAT) and mechanical design science are interconnected. This article describes how a well-established design modelling approach. The Hubka-Eder model, is applied to the concepis of PAT end quality by design (QBD). The model connects PAT With quality management concepts as defined for PAT by lhe ICH guldelines for quaiity issues. Examples are taken fom biopharmaceutical applications. but lhese are also applicable to other pharmaceutical ingredients (API). Benefits of using a conceptual design modelling approach on PAT and related subjects are discussed and suggestecl as a complementary functionality analysis tool in PAT and quality design pharmaceutical processes.

  • 16.
    Wilhelms, Sören
    et al.
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Derelöv, Micael
    Linköpings universitet, Institutionen för konstruktions- och produktionsteknik, Maskinkonstruktion. Linköpings universitet, Tekniska högskolan.
    Supporting concept synthesis by use of genetic algorithms2004Inngår i: Tools and Methods of Competitive Engineering, Proceedings Fifth International Symposium on Tools and Methods of Competitive Engineering / [ed] Horvath, I; Xirouchakis, P, Rotterdam: Milpress , 2004, s. 255-266Konferansepaper (Annet vitenskapelig)
    Abstract [en]

    Evolutionary algorithms are common in parameter optimisation of a given solution. Conceptual design, however, initially involves finding a principle solution, and a bad principle choice can hardly be compensated by even the best detail design and parameter optimisation. This article therefore describes an approach to apply agenetic algorithm for concept synthesis by modelling principle choices as weil as their parameter values and treating both asoptimisation variables. The results are three alternative genome representations (of which a tree genome finally was chosen), algorithms for crossover and mutation operating on the tree genome and an evaluation strategy including weighted sum assessment over multiple criteria (conjunctive selection) as weil as meclhanisms that favour (disjunctive selection) or penalise (disjunctive elimination) concepts performing well or bad in one criterion respectively. The first task was to develop the method, which is also the focus of this article. Testing it in case studies in order to assess the effectiveness and practical applicability remains as a subsequent task. It can though be concluded that the presented approach fulfils its purpose, as it is capable of modelling the choice of the right principle solution during conceptual design.

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