摘要
为进一步缩短试验时间,实现对高可靠性、长寿命竞争失效产品可靠性的快速评定,在综合应力加速寿命试验优化方案设计的基础上,提出了一种基于仿真的竞争失效产品综合应力步降加速寿命试验优化设计方法。采用MonteCarlo对竞争失效产品综合应力步降加速寿命试验进行仿真模拟,以正常使用应力下的p阶分位寿命渐进方差估计最小为目标,在给定各应力组合下试验截尾数大小的条件下,以试验应力水平大小作为设计变量,采用MLE理论进行统计分析,建立了基于仿真的竞争失效产品综合应力步降加速寿命试验优化设计模型。最后通过实例分析,表明该方法的有效性、可行性,为电子装备寿命预测的加速试验方案优化设计提供技术支撑。
In order to shorten test time further and realize rapid evaluation of the reliability of high reliability,long lifetime competing risk products,based on the rules of optimum design plan of multiple stresses accelerate life test.This paper presents a method of simulation based optimal designs for multiple-step-down-stress accelerated life test with competing risks.Simulates the procedure of the test with Monte-Carlo,the asymptotic variance estimation of 100pth percentile of the lifetime distribution of the product at use condition were considered as goal function on the conditions of test censoring numbers of corresponding stress was given.With each test stress level as the design variables,make statistics of analysis with MLE theory,establish the optimal designed model of multiple-step-down-stress accelerated life test with competing risks based on simulation.Simulation results verify feasibility and the validity of this method,and provide technical support for optimal design for AT in life prediction of electronic equipment.
出处
《仪表技术与传感器》
CSCD
北大核心
2014年第3期92-95,共4页
Instrument Technique and Sensor
基金
国家自然科学基金资助项目(61271153)
关键词
竞争失效
综合应力
加速寿命试验
优化设计
competing risk
multiple-step-down-stress
accelerated life test
optimal design
