An accelerated life test model for harmonic drives under a segmental stress history and its parameter optimization  

作　　者：Zhang Chao Wang Shaoping Wang Zimeng Wang Xingjian 

机构地区：[1]School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China [2]Science and Technology on Aircraft Control Laboratory, Beihang University, Beo'ing 100191, China

出　　处：《Chinese Journal of Aeronautics》2015年第6期1758-1765,共8页中国航空学报（英文版）

基　　金：co-supported by National Natural Science Foundation of China(Grant No.51505015,51575019);the National Basic Research Program of China(No.2014CB046402);CAST-BISEE Innovation Foundation of China

摘　　要：Harmonic drives have various distinctive advantages and are widely used in space drive mechanisms. Accelerated life test （ALT） is commonly conducted to shorten test time and reduce associated costs. An appropriate ALT modet is needed to predict the lifetime of harmonic drives with ALT data. However, harmonic drives which are used in space usually work under a segmental stress history, and traditional ALT models can hardly be used in this situation. This paper proposes a dedicated ALT model for harmonic drives applied in space systems. A comprehensive ALT model is established and genetic algorithm （GA） is adopted to obtain optimal parameters in the model using the Manson fatigue damage rule to describe the fatigue failure process and a cumulative dam- age method to calculate and accumulate the damage caused by each segment in the stress history. An ALT of harmonic drives was carried out and experimental results show that this model is acceptable and effective.Harmonic drives have various distinctive advantages and are widely used in space drive mechanisms. Accelerated life test （ALT） is commonly conducted to shorten test time and reduce associated costs. An appropriate ALT modet is needed to predict the lifetime of harmonic drives with ALT data. However, harmonic drives which are used in space usually work under a segmental stress history, and traditional ALT models can hardly be used in this situation. This paper proposes a dedicated ALT model for harmonic drives applied in space systems. A comprehensive ALT model is established and genetic algorithm （GA） is adopted to obtain optimal parameters in the model using the Manson fatigue damage rule to describe the fatigue failure process and a cumulative dam- age method to calculate and accumulate the damage caused by each segment in the stress history. An ALT of harmonic drives was carried out and experimental results show that this model is acceptable and effective.

关 键 词：Accelerated life testing Cumulative fatigue damagelaw Genetic algorithm Harmonic drive Segmental stress history 

分 类 号：TH132.43[机械工程—机械制造及自动化]