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Multicriteria optimisation in design for reliability

Twum, Stephen Boakye (2009)
Ph.D. thesis, University of Birmingham.

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A novel methodology for series-parallel systems’ reliability optimisation has been proposed developed and tested. It formulates the problem as a multi-criteria optimisation, to maximise the subsystem reliabilities while minimising the system cost modelled as a penalty function of component reliabilities, with lower bound constraints on the subsystems’ reliabilities. The goal was to find the Pareto optimal component reliability values that at least yielded a system reliability target. This problem usually occurs at the system design stage. The resultant continuous optimisation model was solved by the Weighted Sum method. The methodology was applied to hypothetical problems and to cases derived from published work concerned with life support and electricity transmission systems’ reliability. It was also tested on a gas transmission system. A comparison of the results with those for a single criterion optimisation model of the life support system indicated that higher reliability could be generated for the components/system under the methodology. The relative levels of the component reliability values were consistent with those achieved under the single criterion formulation. The reliability values allocated to a component was also consistent with their importance. The cost/penalty increased with increase in component reliabilities, becoming indeterminate as component reliability approached its maximum value.

Type of Work:Ph.D. thesis.
Supervisor(s):Aspinwall, Elaine and Fliege, Jorge
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Mechanical Engineering
Subjects:TJ Mechanical engineering and machinery
Institution:University of Birmingham
ID Code:500
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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