一类具有一般不确定性非线性系统的输出反馈鲁棒自适应控制
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摘要
本文考虑一类非线性系统其中m≥1,q=n-m≥0,u∈R和y∈R分别是系统的输入和输出,x=[x_1,x_2,…,x_n]~T∈R~n是系统的状态,β=[θ_1,θ_2,…,θ_p,b_1,b_2,…,b_q]~T∈R~(p+q)是未知的常数参数向量,b_0=1,和σ(y)都是已知的非线性函数,是未知非线性函数,它们表征系统状态及其变化率的不确定性。首先对此系统设计出一个稳定的状态滤波器,从而获得状态x(t)的实时估计(?)(t),然后依此设计出一种用于跟踪参考信号r(t)的输出反馈鲁棒自适应控制器。该控制器对系统参数和状态的不确定性具有鲁棒性,能保证所产生的闭环系统的全局稳定性,并解决了ε-跟踪问题:即对按段光滑的参考信号r(t)和任意给定的ε>0,在保证闭环系统全局稳定的同时能求得有限的时间t(ε),使得;还证明了跟踪绝对误差以负指数衰减速度进入“稳态”。仿真结果表明,所设计的鲁棒自适应控制系统具有良好的跟踪性能,而且控制量在容许控制范围之内。
In this paper, a class of nonlinear systems (1) with general uncertainties and unknown parameters is considered, and a robust adaptive output-feedback controller is designed for tracking reference signal. The controller is robust to the uncertainties of both the parameter and
    the state of the system, can guarantee the global stability of the closed-loop system, and can solve the ε-tracking problem. The simulations show the good track effect of the robust adaptive control system, and the used data for determining the control action are in the range of the admissible control.
引文
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