在逐步Type-Ⅰ混合截尾场合下,研究竞争失效产品简单步进应力加速寿命试验的优化设计。假定产品寿命服从双参数Weibull分布,在形状参数和尺度参数都未知的情形下,得到相应的Fisher信息矩阵,以极大似然渐近方差最小为准则结合Fisher信息矩阵,给出了步进应力加速寿命试验的最优应力转换时间。最后利用Monte-Carlo方法进行数值模拟,并对模拟结果进行了分析。
This paper considers the optimum design of stress change time for the Weibull distribution with competing causes of failure under progressive type-I hybrid censoring. In the case that shape parameter and scale parameter are unknown, the corresponding Fisher information matrix are derived. Then the optimum stress change time is obtained under asymptotic variance criterion. Some analysis of numerical results are performed by Monte-Carlo simulations for illustrative purposes.