Fault diagnosis of continuous annealing processes using a reconstruction-based method

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• 作者：Qiang Liu^a ; Tianyou Chai^a ; ^{tychai@mail.neu.edu.cn} ; S. Joe Qin^b ; ¹ ; ^sqin@usc.edu
• 关键词：Fault diagnosis ; Reconstruction-based block contribution ; Reconstructed index ; Continuous annealing processes
• 刊名：Control Engineering Practice
• 出版年：2012
• 出版时间：May, 2012
• 年：2012
• 卷：20
• 期：5
• 页码：511-518
• 全文大小：654 K

文摘

The continuous annealing process line (CAPL) has complex process characteristics, such as strong correlation of a large number of process variables and interconnected multi-subsystems and multiple operation zones. Practitioners are concerned with typical process faults, such as strip-break and roll-slippage, whose effects are often confined in a specific zone. Considering the large-scale process characteristics and fault characteristics, a multi-block fault diagnosis method is proposed. A novel reconstruction-based block contribution (RBBC) is first proposed in order to diagnose the faulty block. The reconstruction-based variable contribution (RBVC) within a block is also proposed to determine the faulty variables. The proposed RBBC-RBVC hierarchical scheme is applied successfully to a real CAPL on two fault cases. A finite state machine is utilized to diagnose strip-break and reconstructed combined index is studied to diagnose roll-slippage.