机电产品加速贮存寿命试验评估方法

摘要

Objective To study the method to evaluate storage life for long-term storage products. Methods With the preprocessed data from the step stress accelerated storage life test, performance degradation path was built to obtain the pseudo life. After estimating parameters of the life distribution at high stress levels, storage life distribution in normal stress level was extrapolated by the acceleration equation. Results Storage life under normal storage condition was deduced. Conclusion The method proposed in this paper could avoid complicated performance degradation modeling and effectively evaluate the storage life of products with small sample volume and little failure information.%目的：研究长期贮存产品的贮存寿命评估方法。方法采用步进应力加速贮存寿命试验，对原始试验数据进行预处理后建立性能退化轨道，得到产品伪寿命值，然后对高加速应力水平下的贮存寿命分布进行假设检验及参数估计，最后根据加速方程外推到常应力水平下的贮存寿命分布。结果推测出正常贮存条件下的产品贮存寿命。结论该方法避免了复杂的性能退化模型分析和建模工作，能有效地对样本量少、无失效信息的贮存产品进行贮存寿命评估。