Reliability Model of Competing Failure System with Dependent Degradation

doi:10.3969/j.issn.1000-1093.2020.07.021

Abstract

Abstract: Failure of complex systems is often affected by multiple degradation processes and external shocks, and is a competing failure process. To analyze the reliability of such systems, the influence of shock process on the degradation process, the dependency of different degradation processes, and the dependency of the sudden increments of degradation caused by shock are considered simultaneously, and the system reliability model with competing failure is derived based on Gamma process and Copula function, and then an approximate reliability model is proposed to simplify the calculation. On this basis, the parameter estimation and Copula function selection methods are presented. The approximate model of system reliability is tested by taking micro-engine as an example, and the influence of dependency parameters on system reliability is analyzed. The result verifies the accuracy of the approximate reliability model, and illustrates that the dependent degradation has direct influence on the system reliability. Thus, for the system that degradation failure is the dominant failure mode, the dependent degradation should be considered seriously in reliability analysis. Key

Key words: competingfailuresystem, reliability, dependentdegradation, stochasticdegradationprocess, degradationthresholdshockmodel

CLC Number:

TB114.33

YANG Zhiyuan, ZHAO Jianmin, CHENG Zhonghua, LI Liying, CHI Kuo. Reliability Model of Competing Failure System with Dependent Degradation[J]. Acta Armamentarii, 2020, 41(7): 1423-1433.

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第41卷第7期2020 年7月
兵工学报ACTA ARMAMENTARII
Vol.41No.7Jul.2020

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