液压机械式压差伺服系统的差分进化H_(∞)优化设计方法

Differential evolution H_(∞)optimization design method for hydraulic mechanical constant pressure differential servo system

针对液压机械式压差伺服系统正向设计的难点,提出压差伺服系统的差分进化H∞优化设计方法。通过建立状态空间模型,并设计差分进化H_∞频域优化指标,提出一种压差伺服系统的动态设计方法;在此基础上,完成了压差伺服系统镇定、伺服控制规律的优化设计,并进行系统级仿真。仿真结果表明,压差伺服系统稳态特性满足0.92±0.01 MPa,静态误差小于1%,动态调节时间小于0.01 s,超调量小于10%,相角裕度大于70°,20 Hz正弦波动输入信号的干扰下具有鲁棒抗干扰性能。

In response to the difficulties in the forward design of hydraulic mechanical constant pressure dif-ferential servo systems,the differential evolution H_(∞)optimization design method for constant pressure differential servo systems is proposed.By establishing a state space model,and designing the H_(∞)frequency-domain optimiza-tion indexes of differential evolution algorithm,a dynamic design method for constant pressure differential servo systems is proposed.On this basis,the stabilization and servo control laws of a constant pressure differential ser-vo system are designed,and system level simulation is conducted.The simulation results show that the steady-state performance of the constant pressure differential servo system is 0.92±0.01 MPa,the static error is less than 1%,the dynamic settling time is less than 0.01 s,the overshoot is less than 10%,and the phase margin is great-er than 70°.The system has robust disturbance rejection performance under the interference of input signals with 20 Hz sinusoidal fluctuation.