Nonlinear process monitoring using a mixture of probabilistic PCA with clusterings

Motivated by mixture of probabilistic principal component analysis (PCA), which is time-consumingdue to expectation maximization, this paper investigates a novel mixture of probabilistic PCA withclusterings for process monitoring. The significant features are extracted by singular vector decom-position (SVD) or kernel PCA, and k-means is subsequently utilized as a clustering algorithm. Then, parameters of local PCA models are determined under each clustering model. Compared with PCA clustering, SVD based clustering only utilizes the nature basis for the components of the data instead of principal components of the data. Three clustering approaches are adopted and the effectiveness of the proposed approach is demonstrated by a practical coal pulverizing system