arXiv:2411.11497cs.LGcs.RO2024-11中稿 · Machine Learning被引 8

将物理规律嵌入神经网络,让模型用更少数据学得更准。

Physics Encoded Blocks in Residual Neural Network Architectures for Digital Twin Models

  • 用可微分物理模块与神经网络残差结构结合,自动遵循物理规律。
  • 在自动驾驶和气候建模中,用少量数据即超越传统神经网络和先进物理学习方法。
  • 适合需要低数据依赖和强物理一致性建模的工程与科学场景。

物理信息机器学习已成为数字孪生建模与仿真的热门方法,能准确模拟真实系统的动态行为。然而现有方法或依赖简单损失正则化(物理融合有限),或采用高度专用架构(泛化性差)。本文提出一种通用框架——物理编码残差神经网络(PERNN),通过可微分物理模块(实现物理模型中的数学算子)与前馈学习模块相结合,并利用中间残差块保证训练时梯度稳定流动。该模型即使在物理先验知识不完整时,仍自然遵循底层物理规律,从而在低数据需求下提升泛化能力并降低模型复杂度。我们在两个应用领域验证该方法:一是自动驾驶仿真中的转向建模,二是基于常微分方程(ODE)的净生态系统交换(NEE)模型,用于填补通量塔观测数据空白。结果表明,该方法在两项任务中均优于常规神经网络及当前最优物理信息机器学习方法。

原文摘要 · Abstract (English)

Physics Informed Machine Learning has emerged as a popular approach for modeling and simulation in digital twins, enabling the generation of accurate models of processes and behaviors in real-world systems. However, existing methods either rely on simple loss regularizations that offer limited physics integration or employ highly specialized architectures that are difficult to generalize across diverse physical systems. This paper presents a generic approach based on a novel physics-encoded residual neural network (PERNN) architecture that seamlessly combines data-driven and physics-based analytical models to overcome these limitations. Our method integrates differentiable physics blocks-implementing mathematical operators from physics-based models with feed-forward learning blocks, while intermediate residual blocks ensure stable gradient flow during training. Consequently, the model naturally adheres to the underlying physical principles even when prior physics knowledge is incomplete, thereby improving generalizability with low data requirements and reduced model complexity. We investigate our approach in two application domains. The first is a steering model for autonomous vehicles in a simulation environment, and the second is a digital twin for climate modeling using an ordinary differential equation (ODE)-based model of Net Ecosystem Exchange (NEE) to enable gap-filling in flux tower data. In both cases, our method outperforms conventional neural network approaches as well as state-of-the-art Physics Informed Machine Learning methods.

数字孪生物理信息神经网络低数据建模

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