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arXiv 2108.11298eess.SYcs.SY
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基于多项式逼近的非线性系统数据驱动系统分析

Data-driven system analysis of nonlinear systems using polynomial approximation

Tim Martin, Frank Allgöwer

AI总结:

针对非线性系统数据驱动控制现有方法的缺陷,提出基于带噪样本的多项式表示方法,通过平方和松弛实现带严格保证的耗散性验证,扩展后保守性更低,经数值与实验验证有效。

摘要:

在非线性系统数据驱动控制领域,现有方法大多缺乏严格的理论保证、需要求解非凸优化问题,或是要求预先知晓包含系统动力学的函数基。为解决这些缺陷,本文基于泰勒定理的多项式扇区,结合泰勒多项式的集合隶属度,建立了非线性函数的多项式表示,其中集合隶属度由有限带噪样本计算得到。通过纳入测量噪声、多项式逼近误差,以及可能已知的系统动力学结构先验知识,本文借助平方和松弛得到了计算上易处理的条件,可严格保证地验证非线性动力系统的耗散性与增量耗散性。本文还结合多个泰勒多项式逼近对框架进行了扩展,得到了保守性更低的分段多项式系统表示。所提方法已应用于数值算例与实验案例,并与包含第一性原理知识的最小二乘误差模型进行了对比。

英文摘要:

In the context of data-driven control of nonlinear systems, many approaches lack of rigorous guarantees, call for nonconvex optimization, or require knowledge of a function basis containing the system dynamics. To tackle these drawbacks, we establish a polynomial representation of nonlinear functions based on a polynomial sector by Taylor's theorem and a set-membership for Taylor polynomials. The latter is obtained from finite noisy samples. By incorporating the measurement noise, the error of polynomial approximation, and potentially given prior knowledge on the structure of the system dynamics, we achieve computationally tractable conditions by sum of squares relaxation to verify dissipativity and incremental dissipativity of nonlinear dynamical systems with rigorous guarantees. The framework is extended by combining multiple Taylor polynomial approximations which yields a less conservative piecewise polynomial system representation. The proposed approach is applied for numerical and experimental examples. There it is compared to a least-squares-error model including knowledge from first principle.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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