Application of uniform design in missile components accelerated life testing
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摘要: 温度和湿度是影响导弹贮存寿命的两个典型应力,用加速寿命试验的方法预测导弹贮存可靠性将成为一种新趋势.为优化试验设计并应用与之相适应的参数估计方法,将改进的"均匀设计"引入到导弹的加速试验中去,根据加速试验的组合应力大小提出了优化试验顺序的方法,将完全修复的产品继续投入试验中去,从而节约了试验样本量;应用了双应力条件下的"应力-寿命"的数学模型,应用极大似然估计和"稳健回归"相结合的方法来估计参数值,因为单纯的极大似然估计对初值要求较高,往往导致不收敛.通过案例证明了所提的试验方案和评估模型方法理论的正确性和工程的可执行性.Abstract: Temperature and humidity are typical stresses that affect the life of missile storage. Accelerated life testing is becoming a new trend to predicate the reliability of missile storage.In order to optimize the experimental design and propose corresponding parameter estimation method, the testing sequence was adjusted according to the stress level of accelerated life testing which used the improved ‘uniform design-. Thus the completely fixed sample could be reused in the following experiment to reduce the test sample size.The mathematical model ‘stress-life- was derived under the double stress. Both maximum likelihood estimation (MLE) and robust regression were used for estimating the parameters instead of maximum likelihood estimation only because of which has a high request for initial value and often does not converge. The related example verified the correctness and applicability of the design of experiment and the parameter estimation method.
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Key words:
- accelerators /
- uniform design /
- robustness /
- regression analysis
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