An Adaptive Spatiotemporal Decouple Graph Convolutional Network Based Quality-Related Fault Detection Method for Complex Industrial Processes

With the rapid development of industrial technology, industrial processes become increasingly complex, presenting characteristics of large-scale and multi-unit collaboration. However, most current fault detection methods focus on nonlinearity, dynamics, and other characteristics, while neglecting spatiotemporal information. To address this issue, an adaptive spatiotemporal decouple graph convolutional network based quality-related fault detection method is proposed in this article. First, the temporal graph convolutional network and spatial graph convolutional network are combined organically in the form of joint training. Second, considering that fixed graph structures cannot reflect the dynamic relationships among nodes, we proposed an adaptive weighted mask mechanism to construct dynamic correlation graph embedded with priori knowledge. Multi-attention mechanism is used to integrate spatiotemporal information, besides, we designed a decoupling layer to avoid information redundancy. Finally, the proposed spatiotemporal graph convolutional network is used to establish a regression model, the quality-related latent variables are extracted by the decoupling layer, and the statistic is constructed based on Kullback-Leibler divergence. The effectiveness and feasibility of the proposed method are illustrated with the hot strip mill process and the Tennessee Eastman process. First, collecting data in complex industrial processes, after data processing, an adaptive weighted mask mechanism is proposed to construct dynamic correlation graph embedded with priori knowledge. Second, to fully extract spatiotemporal imformation, the temporal graph convolutional network and spatial graph convolutional network are combined organically in the form of joint training, the quality-related latent variables are extracted by the decoupling layer. Finally, online fault detection is completed in a real hot strip mill process and the Tennessee Eastman process. image