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arXiv 2402.14716math.DS
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具有二次输出的描述系统的平衡截断

Balanced Truncation of Descriptor Systems with a Quadratic Output

Jennifer Przybilla, Igor Pontes Duff, Pawan Goyal, Peter Benner

AI总结:

本文针对具有二次输出的微分代数系统,提出基于Weierstraß标准形解耦和Gramian矩阵的平衡截断降阶方法,并给出误差量化与数值验证。

摘要:

本文讨论具有二次输出方程的微分代数系统的模型降阶问题。在温和条件下,这些系统可以转化为Weierstraß标准形,从而解耦为微分方程和代数方程。相应的解耦状态分别称为适当状态和非适当状态。由于输出是状态的二次函数,适当状态和非适当状态在输出方程中相互耦合,这从模型降阶的角度提出了挑战。考虑到这种耦合,本文的目标是找到适当状态和非适当状态的重要子空间,并据此对系统进行降阶。为此,我们首先提出系统的矩阵,即所谓的Gramian矩阵,来刻画系统的主导子空间。我们特别关注可观测性Gramian矩阵的计算,这些矩阵考虑了适当状态与非适当状态之间的非线性耦合。我们进一步证明,所提出的Gramian矩阵与某些核函数相关,这些核函数用于识别重要子空间。这使我们能够提出一种降阶算法,通过移除难以到达以及难以观测的子空间来获得降阶系统。此外,我们量化了全阶模型与降阶模型之间的误差,并通过三个数值实验验证了所提出的方法。

英文摘要:

This work discusses model reduction for differential-algebraic systems with quadratic output equations. Under mild conditions, these systems can be transformed into a Weierstraß canonical form and, thus, be decoupled into differential equations and algebraic equations. The corresponding decoupled states are referred to as proper and improper states. Due to the quadratic function of the state as an output, the proper and improper states are coupled in the output equation, which imposes a challenge from a model reduction viewpoint. Keeping the coupling in mind, our goal in this work is to find important subspaces of the proper and improper states and to reduce the system accordingly. To that end, we first propose the system's matrices, the so-called Gramians, to characterize the system's dominant subspaces. We pay particular attention to the computation of the observability Gramians that take into account the nonlinear coupling between the proper and the improper states. We furthermore show that the proposed Gramians are related to certain kernel functions, which are used to identify important subspaces. This allows us to propose a reduction algorithm to obtain reduced-order systems by removing the subspaces that are difficult to reach, as well as, difficult to observe. Moreover, we quantify the error between the full-order and reduced-order models and demonstrate the proposed methodology using three numerical experiments.

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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