机车车辆区间故障数据置信限近似估计方法

针对机车车辆产品可靠性数据特点,在分析传统区间故障数据置信限估计方法的应用范围及其不足的基础上,依据秩统计理论,提出一种机车车辆区间故障数据置信限近似估计方法并据此开发计算软件,对机车继电器、机车柴油机水泵等相关产品可靠性数据进行计算分析,并与传统估计方法计算结果进行比较。结果表明:本文方法在小样本数据情形下,可获得满意的估计结果,克服了传统方法的大样本苛求;在相同置信水平下,本文方法给出的置信限估计结果更偏安全,适用于对可靠性要求较高的机车车辆产品。

Approximate Estimation Method for Confidence Limit of Interval Fault Data of Locomotive and Car

The characteristics of interval fault data and the point estimation method were introduced;and the application scope and the deficiencies of the traditional estimating method for interval fault data confidence limits were analyzed;on this basis,the approximate estimation method for confidence limits of interval fault data of locomotive and car products was presented with the rank statistic theory.The computing software was developed by means of this method,the reliability data of locomotive relays and locomotive diesel engine pumps were calculated and compared with the calculation results of the traditional estimation method.The results show as follows: The proposed estimation method can obtain satisfactory estimation results with small samples,thus overcoming the large sample demand of the traditional estimating method;at the same confidence level,the confidence limit estimation results are safer than those of the traditional estimating method,which are suitable for locomotive and car products with high reliability demand.