Reliability assessment considering stress drift and shock damage caused by stress transition shocks in a dynamic environment  

作　　者：HUANG Tingting PENG Bo ZHAO Yuepu YU Zixuan 

机构地区：[1]School of Reliability and Systems Engineering, Beihang University

出　　处：《Journal of Systems Engineering and Electronics》2019年第5期1025-1034,共10页系统工程与电子技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC71601009);the Technical Foundation Program from the Ministry of Industry and Information Technology of China(JSZL2015601B010)

摘　　要：Products are often subject to dynamic environmental conditions in field use.When stress transition occurs,products may be exposed to instantaneous shocks that result in shock damages to the products,causing a permanent change of the degradation signals.Meanwhile,under some conditions,instantaneous shocks also lead to stress drift,causing a temporary change of the degradation signals.In this paper,a degradation model is proposed to assess the reliability and predict the residual lifetime of products operating in a dynamic environment considering shock damage and stress drift.The model is established based on a Wiener process which combines a stress-dependent degradation rate function,a shock damage function and a stress drift function in response to the dynamic environment.The shock damage function is established as a linear function of the stress transition start level and the stress level increment.The stress drift function is established as the difference value of a specified function at the stress transition start and end levels.A simulation study is presented to demonstrate the application of the model,and a case study for miniature light bulbs is used to validate the effectiveness of the proposed model.Products are often subject to dynamic environmental conditions in field use. When stress transition occurs, products may be exposed to instantaneous shocks that result in shock damages to the products, causing a permanent change of the degradation signals. Meanwhile, under some conditions, instantaneous shocks also lead to stress drift, causing a temporary change of the degradation signals. In this paper, a degradation model is proposed to assess the reliability and predict the residual lifetime of products operating in a dynamic environment considering shock damage and stress drift. The model is established based on a Wiener process which combines a stress-dependent degradation rate function, a shock damage function and a stress drift function in response to the dynamic environment. The shock damage function is established as a linear function of the stress transition start level and the stress level increment. The stress drift function is established as the difference value of a specified function at the stress transition start and end levels. A simulation study is presented to demonstrate the application of the model, and a case study for miniature light bulbs is used to validate the effectiveness of the proposed model.

关 键 词：degradation modeling dynamic environment STRESS DRIFT shock DAMAGE WIENER process 

分 类 号：TG1[金属学及工艺—金属学]