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http://dx.doi.org/10.17661/jkiiect.2021.14.1.22

Fault Detection Method for Multivariate Process using Mahalanobis Distance and ICA  

Jung, Seunghwan (Department of Electrical and Electronics Engineering, Pusan National University)
Kim, Sungshin (Department of Electrical Engineering, Pusan National University)
Publication Information
The Journal of Korea Institute of Information, Electronics, and Communication Technology / v.14, no.1, 2021 , pp. 22-28 More about this Journal
Abstract
Multivariate processes, such as chemical and mechanical process, power plants are operated in a state where several facilities are complexly connected, the fault of a particular system can also have fatal consequences for the entire process. In addition, since process data is measured in an unstable environment, outlier is likely to be include in the data. Therefore, monitoring technology is essential, which can remove outlier from measured data and detect failures in advance. In this paper, data obtained from dynamic and multivariate process models was used to detect fault in various type of processes. The dynamic process is a simulation of a process with autoregressive property, and the multivariate process is a model that describes a situation when a specific sensor fault. Mahalanobis distance was used to remove outlier contained in the data generated by dynamic process model and multivariate process model, and fault detection was performed using ICA. For comparison, we compared performance with and a conventional single ICA method. The proposed fault detection method improves performance by 0.84%p for bias data and 6.82%p for drift data in the dynamic process. In the case of the multivariate process, the performance was improves by 3.78%p, therefore, the proposed method showed better fault detection performance.
Keywords
fault detection; ICA; Mahalanobis distance; multivariate process; outlier removal;
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