空空导弹电动舵机自适应模糊滑模控制方法

摘要

针对空空导弹电动舵机系统中存在的参数摄动和外干扰问题，提出一种将非线性特性中的死区特性与自适应律相结合的改进方法。介绍电动舵机控制对象简化模型，采用传统自适应律保证系统能够快速到达滑模面；当切换函数值到达设定值时，改变自适应律，以切换函数的值作为切换增益，使得滑模控制的切换增益随着切换函数的递减而递减，最终驱使系统平稳的进入滑模态。仿真结果表明：该方法进一步提高了舵机的动态性能和的鲁棒性，有效地削弱了系统抖振。%In allusion to the characteristics of parametric uncertainties and disturbance in air-to-air missile electromechanical actuator, a novel method, which matched dead zone character in nonlinear system and adaptive regulation, is proposed. The note introduces the simple model of electromechanical actuator (EMA), uses classic adaptive control to making system arriving quirkily sliding surface. When switch function arrived, adaptive control should be changed, the value of switch function used switch value, so switch value would be descended with switch function, finally control system will arrive sliding mode steady. The simulation result proved that the methods enhance electromechanical actuator robustness and performance, and effectively restrain the system chattering.