Faulty Sensor Detection and Reconstruction for a PVC Making Process
李元(Yuan Li)；周東華(Dong-Hua Zhou)；謝植(Zhi Xie)；S. Joe. Qin
multi-way principal component analysis ； dynamic time warping ； faulty sensor detection ； faulty sensor reconstruction
Chinese Journal of Chemical Engineering
|Volume or Term/Year and Month of Publication||
12卷2期（2004 / 04 / 01）
227 - 233
Based on principal component analysis, this paper presents an application of faulty sensor detection and reconstruction in a batch process, polyvinylchloride (PVC) making process. To deal with inconsistency in process data, it is proposed to use the dynamic time warping technique to make the historical data synchronized first, then build a consistent multi-way principal component analysis model. Fault detection is carried out based on squared prediction error statistical control plot. By defining principal component subspace, residual subspace and sensor validity index, faulty sensor can be reconstructed and identified along the fault direction. Finally, application results are illustrated in detail by use of the real data of an industrial PVC making process.