关键词: 性能退化, 可靠性评估, 伪寿命值, 寿命分布, 极大似然估计

Abstract:

Traditional reliability assessment methods,which are based on failure lifetime data,cannot evaluate the reliabilities of electrical connectors with long-lifetime and highreliability characters.A reliability assessment method based on performance degradation analysis is proposed, the general steps which are used to implement evaluation are given and an accelerated degradation test is designed by taking temperature as accelerated stress.By analyzing the degradation failure mechanism of electrical connectors,its degradation model is deduced and then the pseudolifetime evaluations of the samples are obtained.Lognorm distribution is chosen as the best lifetime distribution by means of Anderson-Darling,and parameters of lifetime distribution function and Arrhenius equation are calculated by MLE.Eventually,the reliability function of the electrical connectors working in operational temperature is deduced and t0.9 is 244240 hours.

Key words: performance degradation;reliability assessment;pseudo-lifetime;lifetime distribution;MLE