基于平均寿命 MSE 的步进应力加速退化试验优化设计

摘要

To reliability prediction of products with high reliability and long life,the Step Stress Accelerated Degradation Test(SSADT)is commonly applied.With the motivation of predicting product reliability most precisely,this paper discusses the products with the degradation process of Wiener process, and proposes an optimal design method of SSADT.In order to minimize the mean square error(MSE)of product mean life,the test plans of SSADT under specified total test cost by utilizing Monte Carlo simulation.The plans can determine the optimal sample size,parameter measurement interval and measurement times of SSADT.In the end of this paper,we present an example of magnetic product to validate the effectiveness of the proposed method.%　　步进应力加速退化试验常应用于高可靠性、长寿命产品的可靠性评估。为了更加准确的评估产品的可靠性,论文针对退化过程服从Wiener过程的退化型产品,提出了步进应力加速退化试验优化设计建模与分析方法。该方法在试验总费用约束下,利用蒙特卡洛仿真估计产品平均寿命的均方误差(MSE),并通过最小化MSE,确定最优的步进应力加速退化试验应力水平、样品数、参数测量间隔及测量次数等。最后,以某磁性产品为例,对该方法的有效性进行实例验证。