Applied Mathematics and Mechanics >
A new maximum-a-posteriori-based gappy method for physical field reconstruction using proper orthogonal decomposition and autoencoder
Received date: 2025-04-16
Revised date: 2025-07-05
Online published: 2025-09-12
Supported by
Project supported by the National Natural Science Foundation of China (No. 12472197)
Copyright
A novel gappy technology, gappy autoencoder with proper orthogonal decomposition (Gappy POD-AE), is proposed for reconstructing physical fields from sparse data. High-dimensional data are reduced via proper orthogonal decomposition (POD), and low-dimensional data are used to train an autoencoder (AE). By integrating the POD operator with the decoder, a nonlinear solution form is established and incorporated into a new maximum-a-posteriori (MAP)-based objective for online reconstruction. The numerical results on the two-dimensional (2D) Bhatnagar-Gross-Krook-Boltzmann (BGK-Boltzmann) equation, wave equation, shallow-water equation, and satellite data show that Gappy POD-AE achieves higher accuracy than gappy proper orthogonal decomposition (Gappy POD), especially for the data with slowly decaying singular values, and is more efficient in training than gappy autoencoder (Gappy AE). The MAP-based formulation and new gappy procedure further enhance the reconstruction accuracy.
Wenwei JIANG , Chenhao TAN , Yuntao ZHOU , Kai YANG , Xiaowei GAO . A new maximum-a-posteriori-based gappy method for physical field reconstruction using proper orthogonal decomposition and autoencoder[J]. Applied Mathematics and Mechanics, 2025 , 46(9) : 1729 -1752 . DOI: 10.1007/s10483-025-3295-6
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