电动飞机大功率泵阀协调作动优化控制仿真

摘要

Due to multiplicative nonlinearity,parameter perturbation and load disturbance,airborne pump and valve coordinated actuation system is difficult to achieve satisfactory control effect.A sliding mode control method based on feedback linearization is proposed.Firstly,the nonlinear model is transformed to a linear subsystem and nonlinear part by using feedback linearization.Then,under the premise of ensuring the zero dynamic stability,a sliding mode controller is designed for the linear model.To improve the dynamic quality of sliding mode and reduce output chattering of the sliding mode control,the switching function and reaching law are designed by combining optimum control and fuzzy control theory.The simulation results through MATLAB/Simulink software show that the control method can effectively improve the control effect with good dynamic response and precision.%为解决机载泵阀协调作动系统存在相乘非线性,在参数摄动与负载干扰下很难达到满意的控制效果的问题,提出了一种基于反馈线性化的滑模变结构控制方法.首先,针对作动系统的非线性模型,利用反馈线性化将其变换为一个线性子系统和非线性部分.其次,在保证系统零动态稳定性的前提下,对线性模型设计了滑模变结构控制器,为了提高滑动模态的动态品质,并削弱滑模控制的输出抖振,结合最优控制与模糊控制理论,分别对控制器的切换函数与趋近律进行了设计.利用MATLAB/Simulink软件进行仿真验证.仿真结果表明,上述控制方法提高了控制效果,使系统具有更好的动态响应特性与精度.极大改善了机载泵阀协调作动系统的综合性能.