用深度学习构建参数化动态模态分解框架,加速复杂系统仿真。
A parametric framework for kernel-based dynamic mode decomposition using deep learning
- 分离线与在线两阶段,用LANDO算法建模系统动态
- 结合降维技术降低高维系统训练成本,提升效率
- 适合需快速模拟的工程优化与不确定性量化场景
代理建模广泛应用于计算科学与工程中,以缓解复杂大规模计算模型或大量查询场景(如不确定性量化与设计优化)中的计算效率问题。本文提出一种基于线性与非线性解耦优化(LANDO)算法的核基动态模态分解参数化框架。该框架包含离线与在线两个阶段:离线阶段从训练数据中构建一系列LANDO模型,用于模拟特定参数下的系统动力学;在线阶段利用这些模型生成目标时间点的新数据,并通过深度学习近似参数与状态之间的映射关系。此外,对高维动力系统应用降维技术,以降低训练计算成本。通过三个数值算例——洛特卡-沃尔泰拉模型、热方程和反应-扩散方程——验证了该框架在效率与有效性上的优势。
原文摘要 · Abstract (English)
Surrogate modelling is widely applied in computational science and engineering to mitigate computational efficiency issues for the real-time simulations of complex and large-scale computational models or for many-query scenarios, such as uncertainty quantification and design optimisation. In this work, we propose a parametric framework for kernel-based dynamic mode decomposition method based on the linear and nonlinear disambiguation optimization (LANDO) algorithm. The proposed parametric framework consists of two stages, offline and online. The offline stage prepares the essential component for prediction, namely a series of LANDO models that emulate the dynamics of the system with particular parameters from a training dataset. The online stage leverages those LANDO models to generate new data at a desired time instant, and approximate the mapping between parameters and the state with the data using deep learning techniques. Moreover, dimensionality reduction technique is applied to high-dimensional dynamical systems to reduce the computational cost of training. Three numerical examples including Lotka-Volterra model, heat equation and reaction-diffusion equation are presented to demonstrate the efficiency and effectiveness of the proposed framework.
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