压力矫直机液压系统的仿真研究

In order to study the pressure straightening machine further, according to mechanical structure and motion characteristics of the pressure straightening machine, hydraulic system of pressure straightening machine was designed. Mathematical model of hydraulic system of pressure straightening machine was established. Simulation research on it was carried out by MATLAB and DSHplus. The research results show: The stability margins of the amplitude and phase in the system are all large ratherish, but the system is stable generally, and further correction is needed to improve the performance of the system. When open-loop gain is less than 9.8×104, the system is stable; the open-loop gain in critical stable state is 21.6. Positively movement of the system will be stable after the time of 0.7s in the step response. The curve of pursuit has attenuation and lag in the sine response. After the fuzzy PID is introduced，dynamic response characteristics and steady state characteristics of the system are improved, and the dead zone of the proportional valve is compensated well.