基于试验数据与使用数据融合的产品寿命可靠性分析方法

可靠性数据分析作为描述、评价产品可靠性的理论方法,已经成为可靠性工程的重要组成部分。针对产品在实际使用中存在未失效数据且数量较多的情况,提出一种将试验数据与使用数据相融合的产品寿命可靠性分析方法。在产品寿命服从典型分布时,利用试验数据与使用数据融合后的数据,采用随机右截尾情形下的极大似然估计方法估算产品寿命分布函数中的参数,进而对产品寿命的可靠性进行分析计算。结果表明:在相同的可靠度和置信水平下,利用试验数据与使用数据融合后增大了样本容量,提高了产品可靠性分析的准确性。

Method of Reliability Life Analysis for Product based on the Fusion of Test Data and Usage Data

As a method of describing and evaluating the reliability of product, analysis of reliability data has been an important component of reliability engineering. The idea is put forward that the usage environment can be transformed into the test environment to fusion the test data and usage data based on the equal damage principle and then the reliability of product life can be analyzed by using the data fusion. After the data fusion, the technique states of usage product and test product are assumed to be the same and they come from the same matrix. The parameters of distribution function can be estimated by the maximum likelihood estimate method when the product life obeys some typical distributions, then the reliability of product life is analyzed by using the data fusion. The examples indicate that the sample capacity is increased after the data fusion, and the analysis accuracy of product life reliability can be improved under the same reliability and confidence level.