维护条件下产品寿命分布规律分析

为了掌握维护条件下产品寿命分布规律,进一步解释其失效特性,从维护条件下产品性能状态变化角度出发,结合累积失效理论,利用复合Poisson过程建立了可靠性模型,得到了该条件下产品在线寿命分布模型。在此基础上,建立了维护条件下产品总体寿命分布模型,并利用偏度-峰度系数和贴近度分析,对维护条件下产品在线寿命分布和总体寿命分布规律进行了数值计算,解释了工程产品在线往往具有集中失效,而总体又具有随机失效的特性。以水泵转子为研究对象,通过数值分析,较好地描述了其定期维护条件下的可靠度和寿命分布,进一步验证了模型的可行性。

Analysis of Life Distribution Rule for Product on Servicing

Considering the characteristics of performance deterioration,the reliability model is established from the cumulating failure mechanism by compound Poisson process. So it can get the life distribution rule for product on servicing and explain the failure characteristics. The on-line life distribution model is also built. On the basis of it, the collectivity life distribution model is developed. Through the number analysis of skewness-kurtosis and nearness, the on-line life distribution of product on servicing is approximately normal distribution, and the collectivity life distribution of product on servicing is approximatelyexponential distribution. So it explains the characteristics of centralized-failure and random-failure. Finally,it can describe the reliability and life distribution of water rotor on scheduled servicing byabove models.The applicability and accuracyof models are shown.