期刊
CONTROL ENGINEERING PRACTICE
卷 124, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.conengprac.2022.105174
关键词
Root cause diagnosis; Causality analysis; Sparse normalization; R-value metric; Fault propagation path analysis
资金
- National Science Fund for Distinguished Young Scholars, China [62125306]
- State Key Laboratory of Synthetical Automation for Process Industries, China [2020-KF-2107]
- Research Project of the State Key Laboratory of Industrial Control Technology, Zhejiang University, China [ICT2021A15]
Causality analysis methods play a crucial role in revealing the mechanisms and evolution of process faults in industry. This study proposes a systematic root cause diagnosis strategy, utilizing Sparse Causal Residual Neural Network (SCRNN) to extract multi-lag linear and nonlinear causal relations simultaneously, and quantifying the root cause using an R-value metric.
Causality analysis methods play an increasingly crucial role in revealing the underlying mechanisms and evolution of process faults in industry. Indeed, in modern complex and integrated industrial systems, causation among various components usually have multi-lag and multi-type characteristics, which means that the time-delay of fault propagation between various process variables is multiple, and there exist both linear and nonlinear causal relations. Such characteristics make conventional causal inference tools ineffective. In this study, a systematic root cause diagnosis strategy is proposed. First, a modular neural network structure, termed Sparse Causal Residual Neural Network(SCRNN) is designed to concurrently extract multi-lag linear and nonlinear causal relations. By optimizing a multivariate time series forecasting objective with hierarchical sparsity constraints, the integral causal structure can be interpreted by checking the parameters of the SCRNN model. This causal structure represents the topology of fault propagation. Furthermore, an R-value metric is devised to quantify the position of each faulty variable and hence pinpoint the root cause accordingly. A numerical case, a benchmark process and a real industrial process illustrate the practicability and superiority of the proposed method.
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