考虑强度退化的车辆主动轮可靠性灵敏度分析  

Sensitivity analysis for reliability of vehicle drive wheels considering strength degradation

作　　者：刘喆 陶凤和[2] 贾长治[2] 牟鹏博 LIU Zhe;TAO Fenghe;JIA Changzhi;MOU Pengbo(68129 Army,Lanzhou 730060,China;Department of Mechanical Engineering,Mechanical Engineering College,Shijiazhuang 050003,China;Department of Equipment Apply,Armored Force Institute,Bengbu 233050,China)

机构地区：[1]68129部队 [2]军械工程学院火炮工程系 [3]装甲兵学院装备运用系

出　　处：《振动与冲击》2018年第7期199-203,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51175508);河北省自然科学基金(E2012506009);河北省科技厅计划项目(16211806D)

摘　　要：主动轮是履带车辆底盘系统的重要传动部件,其强度具有一定的不确定性,且在实际运行过程中其强度是随时间逐渐退化。采用Gamma随机过程描述机械零部件的强度退化过程,运用基于随机摄动法和四阶矩理论的可靠性数值分析法,讨论了机械系统零部件随机参数在非正态分布时的灵敏度分析问题,运用矩阵微分法推导了机械零部件随机变量均值和方差的灵敏度计算公式,进而以履带车辆的主动轮为例,运用所提方法进行计算验证,计算结果表明该方法可以有效解决机械零部件强度退化时可靠性的灵敏度分析问题。研究成果可以推广到相关机械可靠性优化设计领域,具有十分重要的实用意义。Drive wheel is an important transmission component in a tracked vehicle chassis system,its strength has a certain uncertainty and is degenerative with time in actual operation process.Here,Gamma random process was used to describe the strength degradation process of mechanical components.Matrix differential method was used to derive sensitivity calculation formulas for mean and variance of mechanical components’random variables.Taking drive wheel of a tracked vehicle as an example,the proposed method was verified.The results showed that the proposed method can effectively solve the sensitivity analysis problem for the reliability of mechanical components with strength degradation;the study results can be extended to the related machinery reliability optimal design fields with some practical significance.

关 键 词：机械系统 Gamma退化过程 四阶矩技术 灵敏度分析 

分 类 号：TB114.3[理学—概率论与数理统计]