考虑结构多失效模式的电动舵机系统可靠性预计  

System Reliability Prediction of Electromechanical Actuator Under Structure Multi-Failure Mode

作　　者：周凌[1] 章家保[1] 李艳辉[1] 韩景壮 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033

出　　处：《电光与控制》2014年第11期75-78,105,共5页Electronics Optics & Control

基　　金：国家自然科学基金(51305421);吉林省科技发展计划(20140520137JH)

摘　　要：针对以往试验中出现多种模式的结构失效现象,在对新型舵机系统进行可靠性预计时,有必要在传统电子学预计基础上,加入多失效模式下结构可靠性预计。首先,采用专家评分分配法将系统可靠性指标分配到相应模块与组件,然后由元器件计数法、均值一次二阶矩法分别得到电子学部分与各失效模式下结构部分的可靠性指标,进而得到系统的可靠性指标。从预计结果看出,设计方案达到总体分配到舵机系统的可靠性指标要求,在考虑滚珠丝杆机构多失效模式下的可靠度要低于其他电子学部分,与以往试验中结构失效多于电子学部分的现象较为吻合。In view of the multiple structure failure modes appeared previously in experiments,we added a structure reliability prediction under multi-failure mode based on the traditional electronics prediction when implementing system reliability prediction to a new type actuator system.Firstly,the Expert Grading Allocation Method was used to allocate system reliability index to the corresponding modules and components.Then,the reliability index of electronic components was obtained by Component Counting Method,and the structure reliability index under each failure mode was obtained by FOSM method.Thus the system reliability index was obtained.The prediction results show that：1 ） The reliability indexes of design scheme achieve the requirement of reliability index allocated for the missile;and 2） The reliability index of ball bearing screw under multi-failure mode is lower than that of the other electronics modules,which is consistent with the previous failure phenomenon in experiments.

关 键 词：导弹 电动舵机 可靠性预计 多失效模式 结构可靠性 

分 类 号：V421.6[航空宇航科学与技术—飞行器设计] TB114.3[理学—概率论与数理统计]