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arXiv 2108.08646math.DS
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参数化微分代数系统的平衡截断模型降阶

Model Reduction of Parametric Differential-Algebraic Systems by Balanced Truncation

Jennifer Przybilla, Matthias Voigt

AI总结:

本文提出一种结合平衡截断与 reduced basis method 的参数化微分代数系统模型降阶方法,通过求解投影 Lyapunov 方程并利用残差误差估计器验证近似质量,在流体力学和力学模型上展示了高效性。

摘要:

我们推导了一种将平衡截断应用于参数依赖微分代数系统的程序。为此,我们针对不同的参数值求解多个投影 Lyapunov 方程,以计算截断程序所需的 Gramians。由于对大量参数执行此过程会导致高昂的计算成本,我们将该方法与 reduced basis method 相结合,后者确定感兴趣的参数对应的 Lyapunov 方程解的降阶表示。随后使用基于残差的误差估计器来评估近似的质量。在介绍了一般微分代数系统类的程序后,我们将重点转向具有特定结构的系统,对于这些系统,该方法可以特别高效地应用。我们通过流体力学和力学领域的多个模型说明了该方法的有效性。

英文摘要:

We deduce a procedure to apply balanced truncation to parameter-dependent differential-algebraic systems. For that we solve multiple projected Lyapunov equations for different parameter values to compute the Gramians that are required for the truncation procedure. As this process would lead to high computational costs if we perform it for a large number of parameters, we combine this approach with the reduced basis method that determines a reduced representation of the Lyapunov equation solutions for the parameters of interest. Residual-based error estimators are then used to evaluate the quality of the approximations. After introducing the procedure for a general class of differential-algebraic systems we turn our focus to systems with a specific structure, for which the method can be applied particularly efficiently. We illustrate the efficiency of our approach on several models from fluid dynamics and mechanics.

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