Journal
RELIABILITY ENGINEERING & SYSTEM SAFETY
Volume 96, Issue 5, Pages 569-580Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ress.2010.12.016
Keywords
Multiobjective decision making; Redundancy allocation; Reliability; Availability; Pareto Front; Pareto Set; Level Diagrams
Funding
- Foundation pour une Culture de Securite Industrielle of Toulouse, France [AO2009-04]
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Reliability-based and risk-informed design, operation, maintenance and regulation lead to multiobjective (multicriteria) optimization problems. In this context, the Pareto Front and Set found in a multiobjective optimality search provide a family of solutions among which the decision maker has to look for the best choice according to his or her preferences. Efficient visualization techniques for Pareto Front and Set analyses are needed for helping decision makers in the selection task. In this paper, we consider the multiobjective optimization of system redundancy allocation and use the recently introduced Level Diagrams technique for graphically representing the resulting Pareto Front and Set. Each objective and decision variable is represented on separate diagrams where the points of the Pareto Front and Set are positioned according to their proximity to ideally optimal points, as measured by a metric of normalized objective values. All diagrams are synchronized across all objectives and decision variables. On the basis of the analysis of the Level Diagrams, we introduce a procedure for reducing the number of solutions in the Pareto Front: from the reduced set of solutions, the decision maker can more easily identify his or her preferred solution. (C) 2011 Elsevier Ltd. All rights reserved.
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