Applying the ICA - Based Approach to Detect Faults in Processes

To save time, cost and labor, there are many studies that have been conducted about the detection of faults in industrial processes. Most of the previous studies used only Independent Component Analysis (ICA) or Principal Component Analysis (PCA) for detection, but they cannot form close enough boundaries to reject outliers. This paper proposes an ICA-based approach to detect outliers in a process by forming close boundaries. The basic idea of the proposed method is to apply ICA to convert original data into independent components, and then apply Durbin Watson (DW) criterion to select important independent components. Hereafter, Support Vector Data Description (SVDD) has been applied for outlier detection by forming much tighter boundaries. The efficiency of proposed ICA-based approach is investigated via a simulated multivariate process example. To demonstrate the identification capability of the proposed ICA-based approach, the traditional Hotelling’s T chart is constructed for the simulated data set.