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A multi-objective reliability-redundancy allocation problem with active redundancy and interval type-2 fuzzy parameters

  • Pradip KunduEmail author
Original paper
  • 28 Downloads

Abstract

This paper considers a multi-objective reliability-redundancy allocation problem (MORRAP) of a series-parallel system, where system reliability and system cost are to be optimized simultaneously subject to limits on weight, volume, and redundancy level. Precise computation of component reliability is very difficult as the estimation of a single number for the probabilities and performance levels are not always possible, because it is affected by many factors such as inaccuracy and insufficiency of data, manufacturing process, environment in which the system is running, evaluation done by multiple experts, etc. To cope with impreciseness, we model component reliabilities as interval type-2 fuzzy numbers (IT2 FNs), which is more suitable to represent uncertainties than usual or type-1 fuzzy numbers. To solve the problem with interval type-2 fuzzy parameters, we first apply various type-reduction and defuzzification techniques, and obtain corresponding defuzzified values. As maximization of system reliability and minimization of system cost are conflicting to each other, so to obtain compromise solution of the MORRAP with defuzzified parameters, we apply five different multi-objective optimization methods, and then corresponding solutions are analyzed. The problem is illustrated numerically for a real-world MORRAP on pharmaceutical plant, and solutions are obtained by standard optimization solver LINGO, which is based on gradient-based optimization—Generalized Reduced Gradient technique.

Keywords

Multi-objective optimization Reliability Redundancy allocation Interval type-2 fuzzy set 

Notes

Acknowledgements

The authors are thankful to the Editor and the anonymous Reviewers for valuable suggestions which lead to an improved version of the manuscript.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Decision Science and Operations Management, School of ManagementBirla Global UniversityBhubaneswarIndia

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