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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。
In order to solve the problem of multiplicative nonlinearity in the system of coordinated motion of airborne valves and the difficulty of achieving satisfactory control effect under parameter perturbation and load disturbances, a sliding mode variable structure control method based on feedback linearization is proposed. First of all, aiming at the nonlinear model of actuation system, it is transformed into a linear subsystem and non-linear part by feedback linearization. Secondly, on the premise of ensuring the zero dynamic stability of the system, a sliding mode variable structure controller is designed for the linear model. In order to improve the dynamic quality of the sliding mode and weaken the output chattering of the sliding mode control, combined with the optimal control and fuzzy Control theory, respectively, the controller’s switching function and approach to the design. Simulation using MATLAB / Simulink software. The simulation results show that the above control method improves the control effect and makes the system have better dynamic response characteristics and accuracy. Greatly improve the overall performance of airborne valve coordinated actuation system.