运载火箭压力信号器振动环境下误触发抑制研究

Suppression Study on Mistake Trigger of Pressure Annunciator in Vibration Environment

对运载火箭压力信号器振动环境下误触发动抑制进行了研究。建立基于单微动开关压力信号器的试验系统,在正弦振动条件下复现了误触发现象。构建了振动工况下压力信号器动态仿真模型,分析了采用增加滤波器和双微动开关结构对压力信号器误触发的影响,发现滤波后贮箱压力仍在未达到设计值时发出接通断开信号但开关次数明显减小;采用双微动开关结构后,控制贮箱压力变化范围变大,虽单个微动开关仍有误触发但消除了多次误触发,断开后不会立即再接通,反之亦然。试验结果验证了双微动开关结构对抑制压力信号器多次误触发的有效性。

The suppression of mistake trigger of pressure annunciator of launch vehicle in vibration environment was studied in this paper.The experimental system was set up based on pressure annunciator with one microswitch.The phenomenon of mistake trigger was reappeared under the sine vibration.The dynamic simulation model of pressure annunciator was built.The effects of filter and two microswitch structure on the mistake trigger were analyzed.It was found that the mistake turn-on and turn-off would still happen but the times decreased while the tank pressure was smaller than the normal value after filtering,and the control range of tank pressure would be enlarged after using two microswitch structure.In the later,the multi-mistake trigger was eliminated although the mistake trigger of one microswitch existed.It would not be turn-off immediately after turn-on and vice versa.The experimental result proved that the effectiveness of two microswtich on suppression of multi-mistake trigger of pressure annunciator.