Journal
JOURNAL OF CENTRAL SOUTH UNIVERSITY
Volume 21, Issue 6, Pages 2273-2281Publisher
JOURNAL OF CENTRAL SOUTH UNIV
DOI: 10.1007/s11771-014-2178-y
Keywords
fault diagnosis; nonlinear principal component analysis; auto-associative neural networks
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Funding
- Khuzestan Gas Company, Iran [1390/2]
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Fault diagnostics is an important research area including different techniques. Principal component analysis (PCA) is a linear technique which has been widely used. For nonlinear processes, however, the nonlinear principal component analysis (NLPCA) should be applied. In this work, NLPCA based on auto-associative neural network (AANN) was applied to model a chemical process using historical data. First, the residuals generated by the AANN were used for fault detection and then a reconstruction based approach called enhanced AANN (E-AANN) was presented to isolate and reconstruct the faulty sensor simultaneously. The proposed method was implemented on a continuous stirred tank heater (CSTH) and used to detect and isolate two types of faults (drift and offset) for a sensor. The results show that the proposed method can detect, isolate and reconstruct the occurred fault properly.
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