arXiv:2508.15695cs.LGmath.OC2025-08被引 4

提出自适应惩罚更新策略,高效求解复杂偏微分方程正反问题。

Conditionally adaptive augmented Lagrangian method for physics-informed learning of forward and inverse problems

  • 引入条件自适应惩罚更新机制,动态调节约束违反较大的项。
  • 在高波数亥姆霍兹、泊松方程等难题上实现与先进方法相当的精度。
  • 适合需高精度建模的科学计算领域,如流体、热传导逆问题。

本文对物理与等式约束神经网络(PECANN)框架提出多项关键改进,显著提升其求解复杂偏微分方程(PDEs)的能力。首先,将增广拉格朗日法(ALM)推广至支持多组独立惩罚参数以处理异质约束。其次,提出约束聚合技术,缓解逐点强制带来的效率瓶颈。第三,仅用单一傅里叶特征映射即可捕捉多尺度振荡解,避免传统方法需多重映射或复杂结构。第四,设计新型时间窗策略,实现无离散时间模型的长时演化。第五,提出条件自适应惩罚更新(CAPU)策略:对约束违反较大的项加速拉格朗日乘子增长,同时协调多惩罚参数更新。该方法在跨音速稀疏化问题、涡旋反向标量输运、高波数亥姆霍兹与泊松方程、以及热源反演问题中均表现优异,精度与基于科尔莫戈罗夫-阿诺德网络的最新方法相当。整体上,该框架提升了科学计算中复杂问题的鲁棒性、效率与适用性。

原文摘要 · Abstract (English)

We present several key advances to the Physics and Equality Constrained Artificial Neural Networks (PECANN) framework, substantially improving its capacity to solve challenging partial differential equations (PDEs). Our enhancements broaden the framework's applicability and improve efficiency. First, we generalize the Augmented Lagrangian Method (ALM) to support multiple, independent penalty parameters for enforcing heterogeneous constraints. Second, we introduce a constraint aggregation technique to address inefficiencies associated with point-wise enforcement. Third, we incorporate a single Fourier feature mapping to capture highly oscillatory solutions with multi-scale features, where alternative methods often require multiple mappings or costlier architectures. Fourth, a novel time-windowing strategy enables seamless long-time evolution without relying on discrete time models. Fifth, and critically, we propose a conditionally adaptive penalty update (CAPU) strategy for ALM that accelerates the growth of Lagrange multipliers for constraints with larger violations, while enabling coordinated updates of multiple penalty parameters. CAPU accelerates the growth of Lagrange multipliers for selectively challenging constraints, enhancing constraint enforcement during training. We demonstrate the effectiveness of PECANN-CAPU across diverse problems, including the transonic rarefaction problem, reversible scalar advection by a vortex, high-wavenumber Helmholtz and Poisson's equations, and inverse heat source identification. The framework achieves competitive accuracy across all cases when compared with established methods and recent approaches based on Kolmogorov-Arnold networks. Collectively, these advances improve the robustness, computational efficiency, and applicability of PECANN to demanding problems in scientific computing.

偏微分方程物理信息学习神经网络反问题

Thank you to arXiv for use of its open access interoperability. PaperDance 不是 arXiv 官方产品;中文卡片由大模型生成,请以原文为准。