A novel multi-label classification deep learning method for hybrid fault diagnosis in complex industrial processes

Hybrid Fault Detection and Diagnosis, encompassing both individual and simultaneous faults, is an important solution needed in chemical process safety practice. We systematically examine the two perspectives of simultaneous faults in previous studies: multi-class and multi-label classification, and highlight the limitations of the former while demonstrating the efficacy of the latter. Then, a novel multi-label classification Hybrid Fault Transformer (mcHFT) model was put forward to address hybrid faults. Our model is capable of learning not only intrinsic features of individual faults but also their coupled relationships. Importantly, this work constitutes the first comprehensive evaluation of Hybrid FDD on the Tennessee Eastman (TE) process to our knowledge. The mcHFT model significantly enhances key performance indicators over existing models and introduces an adaptive strategy to reduce false positives. The dataset developed for this research is made available under an MIT license, contributing a valuable resource for future exploration in this field.