基于损伤等效原理的并联系统相关失效可靠性分析

Dependence-Failure Reliability Analysis Based on Equivalent Damage Principle for Parallel System

在考虑零件寿命服从Weibull分布的条件下,针对两个零件的并联系统进行相关失效分析,提出了一种分析相关失效的等效损伤转换方法,并基于损伤等效转换原理及全概率公式对并联系统进行相关失效可靠性建模;应用Monte Carlo仿真验证所建立的模型的正确性.研究表明,这种基于损伤等效原理的并联系统可靠性模型能够很好地反映并联系统零件间的相关失效,并且能够满足损伤等效准则,优于等概率转换法所建立的模型;从而为零件寿命服从Weibull分布的并联系统可靠性分析提供了一种新的方法.

Considering the components whose service life accords with the Weibull distribution, the dependent failure of a parallel system comprising two components is analyzed to propose a method to transform the dependent failure into equivalent damage, thus analyzing further the dependent failure. Then, a dependence-failure reliability model based on the transform principle of equivalent damage and full probability formula is developed for the two components＇ parallel system, and it is verified by the Monte Carlo simulation. The results show that the reliability model of parallel system based on equivalent damage principle can reflect well the dependent failure of the two components and meet the equivalent damage principle. So, it is prior to the model just based on the equivalent probability transform principle and available to provide a new method for the reliability analysis of parallel system of which the service life of its components complies with the Weibull distribution