Weak fault monitoring method for batch process based on multi-model SDKPCA

► A new M-SDKPCA process monitoring method is proposed. ► Hierarchical cluster is obtained through load matrix similarity among SDKPCA models. ► Multi-model structures are constructed along with the variation of cluster number. ► Selection method of the best monitoring model from multiple models is described. ► The proposed approach shows better performance than MKPCA and BDKPCA.