%A WANG Tian-Zhen-1, 2 , GAO Di-Ju-1, LIU Ping-1, TANG Tian-Hao-1 %T A Fault Detection Model Based on Dynamic Limit under Non-periodic Non-steady Conditions %0 Journal Article %D 2012 %J Journal of Shanghai Jiao Tong University %R %P 607-612 %V 46 %N 04 %U {https://xuebao.sjtu.edu.cn/CN/abstract/article_39982.shtml} %8 2012-04-28 %X When the system is working under nonperiodic nonsteady conditions, the traditional straight line limit is hard to detect the faults. For these problems above, this paper presented a fault detection model based on the dynamic limit. According to the need for realtime fault detection, the process data is used to segment handling. And the paper proposes the dynamic limit to substitute the straight limit line. Then slid on the test data transformation, result in subsliding line. And then achieve fault detection by determining the subtraverse line and the dynamic limit. At last, the feasibility analysis is given to the model. The experiment results verify that the model is applicable to the fault detection under the nonperiodic nonsteady conditions even if the system’s multivariate outputs are mutated and the amplitude of Hotelling T2 changes greatly. Compared with traditional methods, the model greatly reduces the system’s leakage alarm and false alarm.