考虑使用环境差异的产品可靠性监控

Product Reliability Detection when Considering the Field Environment Difference

摘要:

在统计过程控制的研究中，产品的可靠性与产品的使用环境息息相关。当对多产品同时监控时，少有研究将各产品的不同使用环境加以考虑。传统控制图通常假设各产品的故障率服从相同参数，但现实生活中，不同的使用环境使得相同故障率的假设很难成立。本文基于似然比统计量提出了一种新的控制图。该统计量考虑了使用环境差异造成的产品故障率的个异性，用于产品总体的可靠性监控。仿真结果表明，本文提出的控制图在不同样本量及环境差异程度下均有很好的检测能力。

Abstract:

In the study of statistical process control, the reliability of products is closely related to the field environment. However, in the monitoring of multiple products, little attention has been paid to the different field environments of each product in control charts. The traditional control chart generally assumes that the data stream of each product follows certain distribution with the same parameter, while in real life, different field environments make such assumption invalid. This paper proposed a new control chart based on the likelihood ratio statistic. This statistic takes account of the variability of the product failure rate caused by the difference in the field environment, which can be used for overall reliability monitoring. Simulation results show that the control chart have good detection capability in different sample sizes and environmental differences.