【摘要】 针对电液伺服系统模型不精确、参数时变和负载干扰大的特点,提出一种Bang-Bang+Fuzzy-PI的自适应复合控制器。为避免在不同控制方式间切换造成系统抖动,选择高斯函数作为切换曲线,并采用遗传算法对Fuzzy控制器的尺度因子和PI控制器的积分常数进行在线优化。比较复合控制器与Fuzzy控制器,Fuzzy-PI控制器和PID控制器的主要动、静态指标,仿真结果表明这种复合控制器调节时间短、稳态精度高、鲁棒性强,具有优良的控制性能。更多还原

【Abstract】 To an imprecise mathematical model of electro-hydraulic servo system with time varying parameters and strong load disturbance,an adaptive hybrid controller composed of Bang-Bang and Fuzzy-PI is presented.For avoiding disturbance results from switching between different control modes,Gauss function is used as switch curve.Furthermore,genetic algorithm is adopted to optimize scaling factors and integral coefficient of the hybrid controller.The dynamic and static indices of the controller are compared with those of Fuzzy controller,Fuzzy-PI controller and PID controller.Simulation result shows that the hybrid controller has shorter adjustment time,less steady-state error and stronger robustness,and the excellent control performance is obtained.更多还原