摘要
针对综合应力加速寿命试验设计问题,就恒定应力加速寿命试验方法。在应用均匀正交试验理论确定了试验应力组合方式和试验次数的基础上,根据所提出的加速寿命试验方案优化设计的准则和方法,以产品在正常工作应力水平时寿命估计值的方差最小为目标,以各加速因子试验应力水平和各次试验试样分配比例为设计变量,应用极大似然估计理论,建立综合应力加速寿命试验方案优化设计的数学模型。对航天电连接器的综合应力加速寿命试验方案优化设计的结果表明,经过优化以后的试验方案不仅可以提高试验数据的估计精度、减少试验次数,而且还可以在相同置信度下减少试验所需的样本数量,并能够缩短试验时间。
For problems of accelerated life test design under multiple stresses, aiming at constant stresses accelerated life test method, by using uniformly orthogonal test theory, the combined mode of different stresses and testing times are determined. According to the proposed rule of accelerated life test plans optimum design, minimum variance of product＇s life estimated value at normal working stresses is taken as design target, test stress levels of each accelerated factor and distribution proportion of test samples are adopted as design variables, the optimum design mathematic model of accelerated life test plan under multiple stresses is built by using maximum likelihood estimation theory. The result about the optimum design of accelerated life test plan under multiple stresses of electrical connectors shows that the optimized test plan can raise estimation precision of test data, reduce test times, also cut down the numbers of test samples and shorten the test time under the same degree of confidence.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2006年第12期101-105,共5页
Journal of Mechanical Engineering
基金
国家自然科学基金(50375142)
航天支撑技术基金
航天科技创新基金。
关键词
综合应力
加速寿命试验
优化设计
Multiple stresses Accelerated life test Optimum design
