Adaptive surrogate modeling for high-dimensional spatio-temporal output

2026-08-17

AI Summary

本文提出了一种自适应代理建模方法，通过降维和自适应采样技术解决高维时空输出问题，提高了计算效率。

Abstract

This paper develops an adaptive surrogate modeling method for problems with very high-dimensional spatio-temporal outputs. The analysis of spatio-temporal multi-physics systems is computationally expensive and consists of a large number of inputs and outputs. Surrogate models are often constructed to replace the physics-based model to achieve computational efficiency in analyses such as uncertainty quantification and optimization that require many function calls. In order to address the challenge introduced by the high dimensionality of spatio-temporal output, a dimension reduction method is first employed to map the high-dimensional output to a low-dimensional latent space. This is followed by the construction of the surrogate model in the low-dimensional space. The prediction error in the original space, which includes both the reconstruction error and surrogate model error, is evaluated using different error metrics. Based on the prediction accuracy of the surrogate model, new training points are identified for adaptive improvement of the surrogate model. We present a novel adaptive sampling technique that combines exploration and exploitation to improve the surrogate model accuracy with the fewest possible runs of the expensive physics-based model. Thermo-mechanical analysis of a gas turbine engine blade is used to analyze the effectiveness of the proposed method.

Problem

• high-dimensional spatio-temporal output
• surrogate modeling
• dimension reduction

Innovation

• Adaptive surrogate modeling
• Dimension reduction
• Spatio-temporal output
• Adaptive sampling