摘要
研究了应力转换时间是随机变量情况下的简单截尾步加寿命试验,并且利用应力转换时间是低应力下次序统计量的信息,给出了简单截尾步加寿命试验的试验模型.在此基础上,以设定应力下对数平均寿命的极大似然估计的渐近方差最小为优化标准,得到了试验的最优设计,最后文中给出的实例证明了该优化设计方案是有效的和可行的.
The step-stress life-testing with random stress-change times under exponential distribution is studied, when the samples are censored. We set up the model of test when the stress change times are order statistics from the lifetime distribution under the lower stress level. Moreover, an optimum test plan is explored by minimizing the asymptotic variance of the maximum likelihood estimates of the mean life at a design stress. At last, an example illustrates the feasibility and efficiency of the optimum test plan.
出处
《系统工程理论与实践》
EI
CSCD
北大核心
2004年第6期109-112,共4页
Systems Engineering-Theory & Practice
基金
国家自然科学基金(79970022)
航空科学基金(98J53125
02J53079)
关键词
步加寿命试验
指数分布
渐近方差
最优设计
step-stress life test
exponential distribution
asymptotic variance
optimum test plan
