Abstract
In the industrial monitoring process, probabilistic principal component analysis (PPCA) is a popular algorithm for reducing the dimension. However, the principal components (PCs) are not easy to interpret and its preserved number cannot be determined automatically. In this paper, we propose a sparse PPCA (SPPCA) to improve the interpretability by adding a prior and introducing sparsification to the loading matrix of PPCA. An expectation-maximization (EM) algorithm is used to obtain the parameters of the probabilistic formulation, and the dimensionality of the latent variable space can be automatically determined during the iterative process. With the sparse representation, a process monitoring strategy is then developed with the construction of several partial PPCA models. Case studies of SPPCA to a numerical case and Tennessee Eastman (TE) benchmark process demonstrate its feasibility and efficiency.
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Zeng, J., Liu, K., Huang, W. et al. Sparse probabilistic principal component analysis model for plant-wide process monitoring. Korean J. Chem. Eng. 34, 2135–2146 (2017). https://doi.org/10.1007/s11814-017-0119-9
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DOI: https://doi.org/10.1007/s11814-017-0119-9