| Summary: | In this paper, the phenomenon of pressure servo valve system self-excited oscillation is studied, the dynamic model of the system is established, and the validity of the model is verified by experimental analysis. On this basis, it is concluded that the pressure oscillation with constant amplitude and nondecaying is caused by self-excited oscillation. Such a phenomenon comes from unreasonable structure design of pressure servo valve. Moreover, the factors affecting pressure oscillation are evaluated qualitatively. In order to suppress the pressure self-excited oscillation, this paper proposes a pressure servo valve structure optimization method based on weakening the positive feedback effect of the backpressure. The simulation results show that the method can effectively eliminate the system self-excited oscillation. The stability margin analysis shows that after the structure optimization, the pressure servo valve system has adequate stability margin.
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