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arXiv 2401.02889math.NAcs.LGcs.NAmath.DS
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能量保持的降阶算子推断用于高效设计与控制

Energy-Preserving Reduced Operator Inference for Efficient Design and Control

Georgia Institute of Technology(佐治亚理工学院)

Tomoki Koike, Elizabeth Qian

AI总结:

针对能量保持二次算子的PDE,提出能量保持算子推断(EP-OpInf)方法,通过约束优化在降阶模型中保留能量结构,实现高效准确的多查询设计与控制。

摘要:

多查询计算(即对工程系统的计算模型需多次评估)在设计与控制中至关重要。对于由偏微分方程(PDEs)控制的系统,典型的高保真数值模型是高维的,在多查询场景下计算成本过高。因此,需要高效的替代模型以实现设计与控制中的低成本计算。本文提出了一种保持物理特性的降阶模型学习方法,针对其二次算子保持能量(如许多流体问题控制方程中出现的算子)的偏微分方程。该方法基于算子推断(Operator Inference)方法,该方法通过最小二乘意义下将降阶模型算子拟合到状态快照和时间导数数据。然而,算子推断通常无法学习到具有原始偏微分方程能量保持特性的降阶二次算子。因此,我们提出了一种新的能量保持算子推断(EP-OpInf)方法,通过约束优化将这种结构施加于学习到的降阶模型。使用粘性Burgers方程和Kuramoto-Sivashinsky方程(KSE)的数值结果表明,EP-OpInf能够学习到高效且准确的降阶模型,并保留这种能量保持结构。

英文摘要:

Many-query computations, in which a computational model for an engineering system must be evaluated many times, are crucial in design and control. For systems governed by partial differential equations (PDEs), typical high-fidelity numerical models are high-dimensional and too computationally expensive for the many-query setting. Thus, efficient surrogate models are required to enable low-cost computations in design and control. This work presents a physics-preserving reduced model learning approach that targets PDEs whose quadratic operators preserve energy, such as those arising in governing equations in many fluids problems. The approach is based on the Operator Inference method, which fits reduced model operators to state snapshot and time derivative data in a least-squares sense. However, Operator Inference does not generally learn a reduced quadratic operator with the energy-preserving property of the original PDE. Thus, we propose a new energy-preserving Operator Inference (EP-OpInf) approach, which imposes this structure on the learned reduced model via constrained optimization. Numerical results using the viscous Burgers' and Kuramoto-Sivashinksy equation (KSE) demonstrate that EP-OpInf learns efficient and accurate reduced models that retain this energy-preserving structure.

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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