Slow feature analysis based on online feature reordering and feature selection for dynamic chemical process monitoring

- SFA is employed to extract the slowly varying features embedded in the dynamic process data.
- An online feature reordering and feature selection strategy is proposed to take full advantages of online fault information.
- The proposed algorithm has better monitoring performance than traditional methods.

This study considers the insufficiency of traditional monitoring methods to eliminate dynamics, and proposes a novel online feature reordering- and feature selection-based slow feature analysis (SFA) algorithm. The SFA algorithm explores the process dynamics from the view of inner variation of data to extract the slowly varying features. The extracted SFs are considered as the representations of steady- and dynamic-state processes. Online feature reordering and feature selection strategies maximize online fault information and can be used to perform fault detection operation. The proposed method is applied to two simulated processes. Monitoring results show that the proposed method has better monitoring results than those of traditional methods.