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arXiv 2102.02144math.DSmath.CA
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离散$k$ -正线性系的对角稳定性及其在非线性系统中的应用

Diagonal Stability of Discrete-time $k$-Positive linear Systems with Applications to Nonlinear Systems

Chengshuai Wu, Michael Margaliot

摘要:

一个线性动力系统称为$k$ -正的,如果它的动力学将具有多达$k-1$符号变化的向量集映射到它自己。对于$k=1$,这简化为正线性系的重要类。由于稳定的正线性时不变(LTI)系统总是允许对角二次李雅普诺夫函数,即它们是对角稳定的,我们可以预期这也适用于稳定的$k$正系统。我们表明,在一般情况下,这是不是在连续时间(CT)和离散时间(DT)的情况下。然后,我们专注于DT $k$ -正线性系,并介绍了DT $k$ -对角稳定性的新概念。证明了这是标准DT对角稳定的必要条件。我们证明了这一新的概念的分析的DT非线性系统的一类应用。

英文摘要:

A linear dynamical system is called $k$-positive if its dynamics maps the set of vectors with up to $k-1$ sign variations to itself. For $k=1$, this reduces to the important class of positive linear systems. Since stable positive linear time-invariant (LTI) systems always admit a diagonal quadratic Lyapunov function, i.e. they are diagonally stable, we may expect that this holds also for stable $k$-positive systems. We show that, in general, this is not the case both in the continuous-time (CT) and discrete-time (DT) case. We then focus on DT $k$-positive linear systems and introduce the new notion of DT $k$-diagonal stability. It is shown that this is a necessary condition for standard DT diagonal stability. We demonstrate an application of this new notion to the analysis of a class of DT nonlinear systems.

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