| Citation: | LIANG Tao, HU Runsheng, LI Qinglian, et al. Thrust control scheme for electric expander cycle of variable thrust liquid rocket engine[J]. Journal of Aerospace Power, 2023, 38（12）：2957-2972 doi: 10.13224/j.cnki.jasp.20210377
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A thrust closed-loop control scheme for electric expander cycle of variable thrust liquid rocket engine was designed, and the control system simulation model was established based on AMESim platform. Besides, the simulation model of some important components was verified. Secondly, the PID (proportional-integral-derivative) controller parameters were selected based on the dynamic models of motor pump and turbopump. Finally, control simulation was carried out for the step signal and slope signal of thrust regulation. The results showed that the double PI controller was suitable for the thrust regulation control of electric expansion cycle engine within the range of thrust ratio 5∶1, and there was no steady-state error in the system, though the oscillation of thrust existed during the throttling process; secondly, for the throttling process, the proportional output oscillation of the control signal of the dual PI controller contributed much to the fluctuation of the control target, and it cannot restrain the fluctuation effectively; compared with step signal, the effect of dual PI controller tracking slope signal was better, so in practice, the slope signal should be considered for thrust throttle.
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