钢缆类相关失效系统的可靠性分析

Reliability Analysis of Dependence-Failure System for Wire Cables

对钢缆进行力学性能分析及可靠性建模,能够对其在使用过程中的可靠性进行评估.首先,通过将钢缆简化为并串联模型,考虑了Weibull效应和Daniels效应对其力学性能的影响;然后,应用次序统计量推导出具有Weibull效应的串联系统强度的Weibull分布表达式;其次,分析了具有Daniels效应的并联系统的强度计算公式和分布函数;最后,在不作钢丝失效独立的假设下,通过条件概率和分步计算对钢缆进行了可靠性建模.研究表明,所建立的钢缆类并串联系统可靠性模型能够为钢缆的可靠性分析提供依据,并且能反映相关失效的影响.

The reliability of wire cables is modeled analyzing their mechanical properties during applications, thus evaluating the reliability. The cable is simplified to be a parallel-series model first, considering both Weibull effect and Danieis effect on its mechanical properties. Then, an expression of Weibull distribution of the strength of the series system with Weibull effect is deduced from order statistic, and an analysis is made to the strength computation formula of the parallel system Daniels effect and relevant distribution function. Assuming that there is no independence-failure, as a result, the reliability model of wire cables is developed by conditional probability and stepping computation. The result shows that the reliability model developed provides a reference to the reliability design of wire cables with dependence failure revealable.