Publications Scientifiques
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Item Improved process monitoring using PCA methods and adaptive threshold scheme(2017) Bakdi, Azzeddine; Kouadri, AbdelmalekItem An improved plant-wide fault detection scheme based on PCA and adaptive threshold for reliable process monitoring : application on the new revised model of Tennessee Eastman process(Wiley, 2017) Bakdi, Azzeddine; Kouadri, AbdelmalekItem Fault detection and diagnosis in a cement rotary kiln using PCA with EWMA-based adaptive threshold monitoring scheme(Elsevier, 2017) Bakdi, Azzeddine; Kouadri, Abdelmalek; Bensmail, AbderazakItem A new adaptive PCA based thresholding scheme for fault detection in complex systems(Elsevier, 2017) Bakdi, Azzeddine; Kouadri, AbdelmalekFor large scale and complex processes, data-driven analysis methods are receiving increasing attention for fault detection and diagnosis to improve process operation by detecting when abnormal process operations exist and diagnosing the sources of the abnormalities. Common methods based on multivariate statistical analysis are widely used and particularly principal component analysis (PCA), fault detection indices used along with PCA including the Hotelling T² statistic and the sum of squared prediction error (SPE) known as the Q statistic can be used to identify faults. This paper develops a new adaptive thresholding scheme based on a modified exponentially weighted moving average (EWMA) control chart statistic, which is effective in detecting small changes and abrupt shifts in the process operation. The aim is to enhance the performance of PCA methods for process monitoring, while maintaining a low false alarm rate with good sensitivity of anomalies. The performance of the developed scheme is compared to a conventional fixed thresholding technique by evaluating the detection performance across various types of faults that occurred in the Tennessee Eastman Process, The results demonstrate the promising capabilities of our proposed schemeItem An adaptive threshold estimation scheme for abrupt changes detection algorithm in a cement rotary kiln(Elsevier, 2014) Kouadri, Abdelmalek; Bensmail, Abderazak; Kheldoun, Aissa; Refoufi, Larbi