Acceleration Feedback Enhanced H∞ Disturbance Attenuation Control for a Class of Nonlinear Underactuated Vehicle Systems
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摘要: 提出了一种即适用于全驱动系统, 也适用于欠驱动系统的加速度反馈控制新方法—加速度反馈增强的 H∞ 控制方法. 通过引入前置滤波器来代替传统加速度反馈控制方法中的高增益, 新的加速度反馈控制方法可以根据已知的非线性动力学项设计非线性鲁棒性增强控制器; 通过与后退算法相结合, 新的加速度反馈控制方法可以应用于欠驱动非线性系统; 通过在频率域及输入输出有限增益 L2 稳定的意义上的分析显示了新的方法具有良好的扰动抑制性能. 最后, 在一个直升机仿真模型上进行的跟踪控制仿真实验的结果验证了新方法的可行性与有效性.Abstract: In this paper, a generalized acceleration feedback control (AFC) design method, named AFC enhanced H∞ controller, is proposed for both fullactuated and underactuated nonlinear autonomous vehicle systems. The AFC is designed as a robust enhancement to the normal control based on known dynamics. First, in order to reject the uncertainties and external disturbances, a linear prefilter is used in the new AFC design method to replace the high gain in the normal AFC. Then, backstepping algorithm is applied to the AFC design of underactuated systems. The analysis of both the disturbance attenuation in frequency domain and input-output finite gain L2 stability shows the new controller design method is applicable. In the end, simulations are conducted with respect to the tracking control of unmanned model helicopter. The results are compared with those obtained by the tracking control without AFC to verify the feasibility of the new method.
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