基于流体主动控制的液体火箭 Pogo 抑制方法仿真研究

The conventional Pogo suppression method uses the installation of accumulators in the fluid system，however，the improvement of the carrying capacity of new launch vehicles is a challenge to the conventional passive accumulator， since it is unable to meet the suppression needs of larger flow pulsations. Therefore， the scheme and control method of Pogo active suppression were studied， and simulation validation was achieved. Firstly， a closed-loop coupling model of propulsion system and structural system of liquid rocket was established by using software MATLAB/Simulink， and the Pogo vibration was reproduced in the time domain. Secondly，two active suppression schemes，including piston type control for low-pressure pulsation and relief type control for high pressure pulsation，were proposed. The control method of adaptive filtering algorithm based on secondary path online identification was studied. The simulation validation was modelled with software AMESim and MATLAB/Simulink， and active suppression of Pogo was achieved. The simulation results showed that both relief scheme for high-pressure pulsation and piston scheme for low-pressure pulsation can achieve more than 90% amplitude attenuation， and eliminate the Pogo vibration of liquid rocket， verifying the effectiveness of the active suppression scheme.