在模拟勤务处理跌落过程的锤击试验中,MEMS后坐保险机构已解除对离心滑块的约束,使后坐保险实际解除。为使问题再现,利用弹塑性非线性模型对后坐保险机构在跌落过程中的运动特性进行了仿真。仿真结果表明,在半正弦加速度脉冲作用下,弹簧上端拐角处发生了较大的塑性变形,导致弹簧伸长而使后坐滑块不能恢复至原位。针对此问题,通过对后坐保险机构的结构特点进行分析,提出了相应的解决方法,即后坐滑块须运动到位后才能完全解除对离心滑块的约束。

In process of imitating impact test on MEMS setback arming device, the problem discovered was that the setback slipper released the centrifugal slipper, inducing the setback device arming actually. In order to reappear the problem, the elastoplastic nonlinearity modal was utilized to simulate the motion specific of setback arming device in process of falling motion. The simulating result indicates that the corner place of spring has big plastic deformation under the half sine acceleration pulse effect, which stretches too long to make the slipper comeback to original state. Aiming at this problem, the resolution has been put forward by analyzing the structure characteristic of setback arming device, namely the setback slipper should reach to the designated position where the restriction to the centrifugal slipper can been completely released.