Fuzzy Bayesian system reliability assessment based on Pascal distribution

The main purpose of this paper is to provide a methodology for discussing the fuzzy. Bayesian system reliability from the fuzzy component reliabilities, actually we discuss on the Fuzzy Bayesian system reliability assessment based on Pascal distribution, because the data sometimes cannot be measured and recorded precisely. In order to apply the Bayesian approach, the fuzzy parameters are assumed as fuzzy random variables with fuzzy prior distributions. The (conventional) Bayes estimation method will be used to create the fuzzy Bayes point estimator of system reliability by invoking the well-known theorem called ‘Resolution Identity’ in fuzzy sets theory. On the other hand, we also provide the computational procedures to evaluate the membership degree of any given Bayes point estimate of system reliability. In order to achieve this purpose, we transform the original problem into a nonlinear programming problem. This nonlinear programming problem is then divided into four sub-problems for the purpose of simplifying computation. Finally, the R. Gholizadeh (B) Mashhad Islamic Azad University, Mashhad, Iran e-mail: [email protected] A. Mastani Shirazi Fars Science & Research Islamic Azad University, Shiraz, Iran e-mail: [email protected] B. S. Gildeh Mazandaran University, Sari, Iran e-mail: [email protected] E. Deiri Science & Research Islamic Azad University, Tehran, Iran e-mail: [email protected] sub problems can be solved by using any commercial optimizers, e.g. GAMS or LINGO.