双重近似拟合的多元件系统寿命分布缩减方法  

Life Time Distribution Reduction for Multi-Component System Via Double Approximate Fitting

作　　者：顾德亮 陈奎生[1] 钱新博 湛从昌[1] GU De-liang;CHEN Kui-sheng;QIAN Xin-bo;ZHAN Cong-chang(School of Machinery and Automation,Wuhan University of Science and Technology,Hubei Wuhan 430081,China)

机构地区：[1]武汉科技大学机械自动化学院,湖北武汉430081

出　　处：《机械设计与制造》2018年第A02期107-111,共5页Machinery Design & Manufacture

基　　金：国家自然科学基金青年项目-基于多准则场景缩减的"零停机"设备状态预测与维护方法研究(71501148)

摘　　要：当多元件串联系统中各元件寿命分布的威布尔参数不一致时,则该系统的寿命分布服从Poly-Weibull分布。随着系统中元件数量的增加,系统层的预防维护优化求解复杂度增加。因此,提出了一种双重近似拟合检验方法,将系统的寿命分布由Poly-Weibull分布缩减至Single-Weibull分布,以降低多元件系统维护优化问题的计算复杂度。其中,提出的双重近似拟合检验方法,即基于输入性能的近似分布拟合,与基于输出性能的近似检验的寿命分布双重缩减方法。通过对某特定液压系统进行算例分析,结果验证了该双重近似拟合检验方法的可行参数范围与有效性。The lifetime distribution of a multi-component series system is Poly-Weibull distribution when Weibull parameters of each component are inconsistent.Increasing of component number in system results in the increasing of computational complexity when dealing with preventive maintenance optimization.To solve this problem,it is proposed a kind of double approximate fitting method to reduce the Poly-Weibull distribution into Single-Weibull distribution.This method contains two steps,first is to make an approximate distribution fitting based-on input performance,second is to make an approximate test based-on output performance.According to the results of numerical cases study for certain hydraulic system,it is proved that the double approximate fitting method is valid in certain range of system parameters.

关 键 词：多元件系统 预防性维护 Poly-Weibull分布 近似拟合 

分 类 号：TH16[机械工程—机械制造及自动化]