基于 Gamma模型和加速退化数据的可靠性分析方法

为了对导弹连接器进行可靠性评估,提出了基于Gamma模型的可靠性分析方法。首先,以电连接器的接触电阻作为性能参量,通过温度、湿度双应力加速退化试验获取其性能退化数据;然后,利用Gamma模型描述样品的退化过程,使用广义艾林模型,描述了样品退化量与温度、湿度之间的关系;最后,使用极大似然估计的方法,估计出了样品在正常工作条件下的模型参数,并对该型电连接器的平均寿命进行了预测。

Reliability Analysis Based on Gamma Model and Double-Stresses Accelerated Test

For predicting the lifetime of missile electrical connector, the approach of degradation data analysis based on Gamma model was accordingly proposed. Firstly, taking contact resistor as performance index, the performance degradation data was gotten through accelerated degradation test, in which temperature and relative hu- midity were accelerated stresses. Nextly, Gamma model was used to fit the degradation path, and then generalized eyring model was utilized to set up relationship between sample lifetimes and accelerated stresses. Lastly, with MLE method, the estimators of model parameters were obtained by integral statistics of all the performance degradation data. Furthermore, the lifetime of electrical connector was successfully predicted.