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Quality-relevant fault monitoring based on efficient projection to latent structures with application to hot strip mill process

Quality-relevant fault monitoring based on efficient projection to latent structures with application to hot strip mill process

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In this study, a new statistical monitoring technique based on efficient projection to latent structures (EPLS) is proposed for quality-relevant fault detection in multivariate processes that exhibit collinear measurements. The algorithm decomposes process variables into three subspaces according to singular value decomposition (SVD) and principal component analysis. This method effectively solves the problems of real-time and effectiveness in the quality-relevant fault diagnosis of industrial processes. EPLS takes full advantage of good nature of SVD. As a result, the calculation of the projection process is greatly reduced. It is reasonable that the process data space was projected to three subspaces, a quality-relevant subspace, a quality-irrelevant subspace and a residual subspace. EPLS algorithm not only effectively avoids the tedious iterative calculation, but also makes more explicit spatial resolution. The framework of quality-relevant fault monitoring based on EPLS algorithm was proposed as well in this study. A challenging problem, real industrial hot strip mill process, is used to illustrate the effectiveness of the proposed method.

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