论文部分内容阅读
针对导弹电动舵机系统中参数摄动和外界干扰等不确定性对其性能的影响,提出一种离散自适应全程滑模控制器(AGSMC).通过设计非线性切换函数,使系统轨迹在初始时刻就落在滑模面上,大大缩短了初始到达时间.AGSMC的设计基于离散自适应趋近律,并且采用了线性外推法估计系统的不确定性,保证了系统在稳定情况下具有全程鲁棒性.通过对某电动舵机实验台的仿真表明,AGSMC方案与一般的指数趋近律法相比,不仅确保了系统对不确定性的鲁棒性以及舵机的位置跟踪精度,而且在很大程度上削弱了控制量的高频抖动现象.此外,所提出的控制方案不需要满足匹配条件,因此通用性较高.
Aiming at the influence of uncertainties such as parameter perturbation and external disturbance on its performance in missile electro-hydraulic servo system, a discrete adaptive sliding mode controller (AGSMC) is proposed. By designing nonlinear switching function, Time falls on the sliding surface, greatly reducing the initial arrival time.AGSMC design based on discrete adaptive approach law, and the use of linear extrapolation to estimate the uncertainty of the system to ensure that the system has full stability in the case Robustness.The simulation results of a test rig for an electro-hydraulic servo show that the AGSMC scheme not only ensures the robustness of the system against uncertainties and the tracking accuracy of the servo as compared with the general exponential approach, Which greatly weakens the dithering of the control volume.In addition, the proposed control scheme does not need to meet the matching conditions, so the versatility is higher.