双应力同步降压与双应力交叉步降压实验的数值模拟与应用  

Numerical Simulation and Application of Double-Stress SynchronousStep-Down Experiment and Double-StressCross-Step Step-Down Experiment

作　　者：张志强[1] 蔡庆秋 ZHANG Zhiqiang;CAI Qingqiu(School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学机械工程学院,上海200093

出　　处：《轻工机械》2023年第3期24-34,共11页Light Industry Machinery

摘　　要：为进一步比较可靠性工程中评估产品寿命的2种常规方法(双应力同步降压加速寿命实验和双应力交叉步降压加速寿命实验)的实验效率,课题组借助计算机仿真,并调用服从Weibull分布的产品寿命的典型算例,比较了2种实验方法的时间消耗和产品失效速率,发现在相同实验条件下双应力同步降压加速寿命实验方法提高的实验效率更显著。课题组在双应力同步降压加速寿命实验失效时间曲线的基础上,利用蒙特卡罗法研究了Weibull分布中形状参数m对不同样本数与不同应力水平下双应力同步降压加速寿命试验的失效时间和效率的影响。结果表明:在相同形状参数下,各应力水平的失效时间曲线的趋势一致;在同一应力水平下,不同形状参数的失效时间曲线稳定相交于各样本容量的63%。这一结论也适用于其他的双应力加速寿命实验。课题组基于双应力同步降压加速寿命实验方法,建立了一种绕线联轴器加速退化模型,并推导出了一种在绕线联轴器正常工作条件下预测产品可靠性寿命的数学模型。解析结果表明该预测模型能够有效预测绕线联轴器的真实寿命。In orde to compare the experimental efficiency of two conventional methods for evaluating product life in reliability engineering:double stress synchronous step-down accelerated life test and the double stress cross step step-down accelerated life test,computer simulation was used,and a typical example of product life following Weibull distribution was called.According to the comparison of the time consumption and product failure rate of the two experimental methods,it was found that under the same experimental conditions,the double stress synchronous step-down accelerated life test method improved the experimental efficiency more significantly.Based on the failure time curve of double-stress synchronous step-down accelerated life test,the influence of shape parameters in Weibull distribution on failure time and efficiency of dual stress synchronous step-down accelerated life test under different sample numbers and different stress levels was studied by using Monte-Carlo method.The results show that the failure time curves of different stress levels have the same trend under the same shape parameters.Under the same stress level,the failure time curves of different shape parameters intersect stably at 63%of each sample size.This conclusion is also applicable to other double-stress accelerated life tests.An accelerated degradation model of the winding coupling was established,and a mathematical model was derived to predict the reliability life of the product under the normal working condition of the winding coupling,based on the accelerated life experiment method of double stress synchronous depressurization.The analytical results show that the reliability life prediction model based on the accelerated life experiment data can effectively predict the real life of the winding coupling.

关 键 词：可靠性评估 双应力 加速寿命实验 WEIBULL分布 效率比 形状参数 

分 类 号：TH123.4[机械工程—机械设计及理论]