基于步进加速退化试验的某型电连接器可靠性评估

Reliability Assessment for a Certain Type of Electrical Connector Based on Step-Stress Accelerated Degradation Test

某导弹电连接器属于高可靠性、长寿命产品,在短时间内很难获取其失效数据。为了评估其可靠性,在分析其失效机理的基础上设计了步进应力加速退化试验,通过分析加速退化数据外推出产品在正常工作应力水平下的可靠度函数。试验中,以电连接器的接触电阻作为性能参量,选取温度作为加速应力。数据分析时利用Wiener随机过程对样品退化进行建模,为了提高模型参数的估计精度,采用极大似然法对所有性能退化数据进行整体统计推断。结果表明,提出的基于加速退化数据分析的方法实用、有效,实现了某导弹电连接器的可靠性评估并可为其他高可靠性产品的可靠性评估工作提供参考。

Since a certain type of missile electrical connector is a product with high reliability and longlifetime, it is difficult to obtain failure-to-time data in a short time. For assessing the reliability of theproduct, a step-stress accelerated degradation test was designed based on analysis to its failure mechanism.Then, the reliability function at the normal use stress level was extrapolated from the accelerated degradationdata. In the test, the contact resistor was taken as the performance index and temperature was used asaccelerated stress. When analyzing degradation data, Wiener process was adopted to model the degradationprocess. A maximum likelihood function integrating all the degradation data was established for improvingthe accuracy of estimation. The results show that the proposed approach based on analyzing accelerateddegradation data is practical and effective, which can realize the reliability assessment of the missileelectrical connector and can be extended to evaluate the reliability of other highly reliable products.