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On Evaluation of Design Concepts: Modelling Approaches for Enhancing the Understanding of Design Solutions
Linköping University, Department of Management and Engineering, Assembly technology . Linköping University, The Institute of Technology.
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press , 2009. , 80 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1273
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-21085ISBN: 978-91-7393-536-4 (print)OAI: oai:DiVA.org:liu-21085DiVA: diva2:240538
Public defence
2009-10-23, C3, C-huset, Campus Valla, Linköpings universitet, Linköping, 13:15 (English)
Opponent
Supervisors
Available from: 2009-09-28 Created: 2009-09-28 Last updated: 2009-09-28Bibliographically approved
List of papers
1. Engineering Design Methodology for Bio-Mechatronic Products
Open this publication in new window or tab >>Engineering Design Methodology for Bio-Mechatronic Products
2008 (English)In: Biotechnology progress (Print), ISSN 8756-7938, E-ISSN 1520-6033, Vol. 4, no 1, 232-244 p.Article in journal (Refereed) 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.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-21068 (URN)10.1021/bp0701822 (DOI)
Available from: 2009-09-28 Created: 2009-09-28 Last updated: 2017-12-13Bibliographically approved
2. PAT and design science
Open this publication in new window or tab >>PAT and design science
2007 (English)In: European Pharmaceutical Review, no 3, 74-80 p.Article in journal (Refereed) 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.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-21073 (URN)
Available from: 2009-09-28 Created: 2009-09-28 Last updated: 2009-09-29Bibliographically approved
3. Supporting concept synthesis by use of genetic algorithms
Open this publication in new window or tab >>Supporting concept synthesis by use of genetic algorithms
2004 (English)In: 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, 255-266 p.Conference paper, Published paper (Other academic)
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.

Place, publisher, year, edition, pages
Rotterdam: Milpress, 2004
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-21078 (URN)90-5966-018-8 (ISBN)
Conference
Fifth International Symposium on Tools and Methods of Competitive Engineering, Lausanne, Switzerland, April 13 - 17, 2004
Available from: 2009-09-28 Created: 2009-09-28 Last updated: 2012-11-30Bibliographically approved
4. An Approach to Verification and Evaluation of Early ConceptualDesign Solutions
Open this publication in new window or tab >>An Approach to Verification and Evaluation of Early ConceptualDesign Solutions
2002 (English)In: Proceeding of 7th International Design Conference - Design, Dubrovnik, 2002, 125-130 p.Conference paper, Published paper (Refereed)
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.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-21081 (URN)
Available from: 2009-09-28 Created: 2009-09-28 Last updated: 2009-09-28Bibliographically approved
5. Qualitative Modelling of Potential Failure: On Evaluation ofConceptual Design
Open this publication in new window or tab >>Qualitative Modelling of Potential Failure: On Evaluation ofConceptual Design
2008 (English)In: Journal of engineering design (Print), ISSN 0954-4828, E-ISSN 1466-1837, Vol. 19, no 3, 201-225 p.Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
Abingdon, Oxfordshire, United Kingdom: Taylor & Francis, 2008
Keyword
Concept; Evaluation; Failure; Methodology; Reliability
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-21082 (URN)10.1080/09544820701255858 (DOI)000254947400002 ()
Available from: 2009-09-28 Created: 2009-09-28 Last updated: 2017-12-13Bibliographically approved
6. Identification of Potential Failure: On Evaluation of ConceptualDesign
Open this publication in new window or tab >>Identification of Potential Failure: On Evaluation of ConceptualDesign
2009 (English)In: Journal of engineering design (Print), ISSN 0954-4828, E-ISSN 1466-1837Article in journal (Other academic) 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.

Keyword
Concept, Evaluation, Failure, Methodology, Reliability
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-21083 (URN)
Available from: 2009-09-28 Created: 2009-09-28 Last updated: 2017-12-13Bibliographically approved

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Derelöv, Micael

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