arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.10125eess.SYcs.SY
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几类非线性动力系统的状态和未知输入集值同时观测器

Simultaneous State and Unknown Input Set-Valued Observers for Some Classes of Nonlinear Dynamical Systems

Mohammad Khajenejad, Sze Zheng Yong

摘要:

在本文中,我们提出了固定阶集值(形式为l2-范数超球)观测器的几类非线性有界误差动力系统与未知的输入信号,同时发现有界超球的状态和未知的输入,包括真实的状态和输入。针对($\mathcal{M},γ$)-二次约束(($\mathcal{M},γ$)-QC)系统,以线性矩阵不等式(LMI)的形式给出了观测器稳定(二次稳定)的充分必要条件,其中包括几类非线性系统:(I)Lipschitz连续系统,(II)($\mathcal{A},γ$)-QC* 系统和(III)线性变参数(LPV)系统.这种新的二次约束性质至少与非线性系统的增量二次约束性质一样一般,并且在本文中被证明体现了广泛的非线性。此外,我们设计了最佳的$\mathcal{H}_{\infty}$观测器,其中满足二次稳定性条件,并表明设计结果一致有界输入有界状态(UBIBS)估计半径/误差动态和一致有界序列的估计半径。此外,我们提供了封闭形式的上限序列的估计半径和充分条件,其收敛到稳定状态。最后,建议的集值观测器的有效性证明,通过说明性的例子,在那里我们比较我们的观察员与一些现有的观察员的性能。

英文摘要:

In this paper, we propose fixed-order set-valued (in the form of l2-norm hyperballs) observers for some classes of nonlinear bounded-error dynamical systems with unknown input signals that simultaneously find bounded hyperballs of states and unknown inputs that include the true states and inputs. Necessary and sufficient conditions in the form of Linear Matrix Inequalities (LMIs) for the stability (in the sense of quadratic stability) of the proposed observers are derived for ($\mathcal{M},γ$)- Quadratically Constrained (($\mathcal{M},γ$)-QC) systems, which includes several classes of nonlinear systems: (I) Lipschitz continuous, (II) ($\mathcal{A},γ$)-QC* and (III) Linear Parameter-Varying (LPV) systems. This new quadratic constraint property is at least as general as the incremental quadratic constraint property for nonlinear systems and is proven in the paper to embody a broad range of nonlinearities. In addition, we design the optimal $\mathcal{H}_{\infty}$ observer among those that satisfy the quadratic stability conditions and show that the design results in Uniformly Bounded-Input Bounded-State (UBIBS) estimate radii/error dynamics and uniformly bounded sequences of the estimate radii. Furthermore, we provide closed-form upper bound sequences for the estimate radii and sufficient condition for their convergence to steady state. Finally, the effectiveness of the proposed set-valued observers is demonstrated through illustrative examples, where we compare the performance of our observers with some existing observers.

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