星载重叠天线锁紧座滑移故障分析

Fault analysis for lock seat slip of space-borne overlapping antenna

锁紧座在使用过程中常常会因振动发生接触面滑移故障,导致锁紧座锁紧状态失效。针对此问题,提出了一套锁紧座接触面力学状态的试验分析方法;首先设计加工了重叠天线试验模型并进行振动试验,得到频响曲线和动态应变曲线;然后在锁紧座接触面引入弹簧组等效模型,建立了重叠天线整体有限元模型,并根据试验结果对有限元模型进行了修正。对比分析了锁紧座发生滑移故障前后的接触力状态,评估了滑移故障对于锁紧座性能的影响。

In operation process,contact surface slip faults of antenna lock seat often happen due to vibration to cause locking state failure of the lock seat.Here,in order to solve this problem,a test analysis method for contact surface mechanical state of antenna lock seat was proposed.Firstly,an overlapped antenna test model was designed and manufactured to do vibration tests.Its frequency response curve and dynamic strain curve were obtained in vibration tests.Then,a spring set equivalent model was introduced on contact surface of the lock seat,and the whole overlapping antenna finite element(FE)model was built.According to the test results,the FE model was modified.Finally,contact force states before and after the lock seat having slip fault were analyzed contrastively to evaluate effects of slip fault on the lock seat performance.