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arXiv 2302.08490math.NAcs.NA
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非线性动力系统的张量参数模型降阶

Tensorial parametric model order reduction of nonlinear dynamical systems

Alexander V. Mamonov, Maxim A. Olshanskii

AI总结:

本文提出张量参数模型降阶方法(TROM),利用低秩张量近似替代SVD,结合POD-DEIM框架,实现参数化非线性系统的快速预测,降低在线成本与降阶维度。

摘要:

针对依赖于参数的非线性动力系统,本文提出了一种新颖的张量降阶模型(TROM)。该降阶模型基于投影,对于不涉及参数的系统,它类似于结合离散经验插值方法(DEIM)的本征正交分解(POD)。对于参数系统,TROM采用低秩张量近似代替截断奇异值分解(SVD),后者是POD与DEIM中的关键降维技术。为此,考虑了三种流行的低秩张量压缩格式:典型多向分解(CP)、Tucker分解和张量列(TT)。使用多重线性代数工具可以将系统参数依赖性的信息纳入降阶模型,从而产生一种POD-DEIM类型的ROM,其特点为:(i)参数特定(局部化),能够预测训练集外(未见)参数值的系统动态;(ii)减轻高维参数空间的不利影响;(iii)在线计算成本仅取决于张量压缩秩,而不取决于全阶模型规模;(iv)与传统POD-DEIM ROM相比,实现了更低的降阶空间维度。本文阐述了该方法,分析了其预测能力,并针对两个特定的参数依赖非线性动力系统评估了其性能。

英文摘要:

For a nonlinear dynamical system that depends on parameters, the paper introduces a novel tensorial reduced-order model (TROM). The reduced model is projection-based, and for systems with no parameters involved, it resembles proper orthogonal decomposition (POD) combined with the discrete empirical interpolation method (DEIM). For parametric systems, TROM employs low-rank tensor approximations in place of truncated SVD, a key dimension-reduction technique in POD with DEIM. Three popular low-rank tensor compression formats are considered for this purpose: canonical polyadic, Tucker, and tensor train. The use of multilinear algebra tools allows the incorporation of information about the parameter dependence of the system into the reduced model and leads to a POD-DEIM type ROM that (i) is parameter-specific (localized) and predicts the system dynamics for out-of-training set (unseen) parameter values, (ii) mitigates the adverse effects of high parameter space dimension, (iii) has online computational costs that depend only on tensor compression ranks but not on the full-order model size, and (iv) achieves lower reduced space dimensions compared to the conventional POD-DEIM ROM. The paper explains the method, analyzes its prediction power, and assesses its performance for two specific parameter-dependent nonlinear dynamical systems.

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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