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Identification of Potential Failure: On Evaluation of ConceptualDesign
Linköping University, Department of Management and Engineering, Assembly technology . Linköping University, The Institute of Technology.
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.

Place, publisher, year, edition, pages
2009.
Keyword [en]
Concept, Evaluation, Failure, Methodology, Reliability
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-21083OAI: oai:DiVA.org:liu-21083DiVA: diva2:240529
Available from: 2009-09-28 Created: 2009-09-28 Last updated: 2017-12-13Bibliographically approved
In thesis
1. On Evaluation of Design Concepts: Modelling Approaches for Enhancing the Understanding of Design Solutions
Open this publication in new window or tab >>On Evaluation of Design Concepts: Modelling Approaches for Enhancing the Understanding of Design Solutions
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:nbn:se:liu:diva-21085 (URN)978-91-7393-536-4 (ISBN)
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

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Derelöv, Micael

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