数字式火箭发动机涡轮泵转速测量方法研究

Research on digital measuring method of rocket engine turbopump

为解决因测量精度低、实时性差引起的液体火箭发动机工况分析困难的问题,结合某型号运载火箭发动机涡轮泵转速信号特点和遥测信号传送要求,提出了基于的CPLD周期法测量液体火箭发动机涡轮泵转速的方法,对转速信号周期的提取、传输以及在遥测系统内的波道编码进行了设计,采用Quartus II软件对转速周期的测量过程进行了仿真验证,设计的原理样机参加了该型号火箭遥测系统试验,试验结果表明,数字式发动机转速测量方法较型号现有的"分频法"在测量的精度和实时性方面均有大幅提升,能有解决目前发动机在加速启动段和减速关机段等转速急剧变化时段转速不能及时、准确测量的问题。

To solve the problem that low measuring accuracy and bad real-time caused rocket engine working condition analysis difficult.Based on the characteristics of a rocket engine turbopump rotational speed signal and telemetry signals rules this paper proposed a cycle method measuring the rotational speed of liquid rocket engine turbopump based on CPLD.Designed the speed signal cycle extraction,transmission and channel coding method in telemetry system.Using the Quartus II software simulation process of speed cycle measurement.An original products took part in the telemetry system test.The results show that digital engine speed measurement method better than lower frequency method in measurement accuracy and real-time performance.It can solve the problem that rocket engine is immeasurable In the period of Speed change quickly like accelerating period and shutdown periods.