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Discrete-time low-gain control of uncertain infinite-dimensionalsystems

机译:不确定无穷维系统的离散低增益控制

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Using a frequency-domain analysis, it is shown that the application of a feedback controller of the form k/(z-1) or kz/(z-1), where k∈R, to a power-stable infinite-dimensional discrete-time system with square transfer-function matrix G(z) will result in a power-stable closed-loop system which achieves asymptotic tracking of arbitrary constant reference signals, provided that i) all the eigenvalues of G(1) have positive real parts, and ii) the gain parameter k is positive and sufficiently small, Moreover, if G(1) is positive definite, we show how the gain parameter gain X can be tuned adaptively. The resulting adaptive tracking controllers are universal in the sense that they apply to any power-stable system with G(1)>0; in particular, they are not based on system identification or plant parameter estimation algorithms, nor is the injection of probing signals required. Finally, we apply these discrete-time results to obtain adaptive sampled-data low-gain controllers for the class of regular systems, a rather general class of infinite-dimensional continuous-time systems for which convenient representations are known to exist, both in state space and in frequency domain. We emphasize that our results guarantee not only asymptotic tracking at the sampling instants but also in the sampling interval
机译:使用频域分析表明,将形式为k /(z-1)或kz /(z-1)(其中k∈R)的反馈控制器应用于功率稳定的无穷大离散量平方传递函数矩阵G(z)的时间系统将产生功率稳定的闭环系统,只要i)G(1)的所有特征值都具有正实部,就可以实现任意常数参考信号的渐近跟踪ii)增益参数k为正且足够小,此外,如果G(1)为正定,我们将说明如何自适应地调整增益参数增益X。由此产生的自适应跟踪控制器具有通用性,因为它们适用于G(1)> 0的任何功率稳定系统;特别是,它们不是基于系统识别或工厂参数估计算法,也不是需要注入探测信号。最后,我们将这些离散时间结果应用于常规系统类别的自适应采样数据低增益控制器,这是一种相当普遍的无限维连续时间系统类别,已知存在便利表示形式,且都处于状态空间和频域。我们强调,我们的结果不仅保证了采样时刻的渐近跟踪,而且还保证了采样间隔

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