A Novel Multi-Mode Bayesian Method for the Process Monitoring and Fault Diagnosis of Coal Mills

With the development of modernization, the application of seamless tube becomes widespread. As the first process of seamless tube, piercing is vital for the quality of the tube. The solid round billet will be transformed into a hollow shell after the piercing process. The defects of hollow shell cannot be cleared in the following process, so a monitoring model for the quality of the hollow shell is important. But the piercing process is very complicated, and a mechanism model is difficult to build between the qualities of the hollow shell and measurement variables. Furthermore, an intelligent model is needed. We established two piercing process monitoring and fault diagnosis models based on the multiway principal component analysis (MPCA) model and the multistage MPCA model, respectively, and furthermore we made a comparison between these two concepts. We took three ways to divide the period based on process,K-means, and GA, respectively. Simulation experiments have shown that the multistate MPCA method has advantage over the MPCA method and the model based on the genetic algorithm (GA) can monitor the process effectively and detect the faults.

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Multi-mode combustion process monitoring on a pulverised fuel combustion test facility based on flame imaging and random weight network techniques

Fuel ◽

10.1016/j.fuel.2017.03.091 ◽

2017 ◽

Vol 202 ◽

pp. 656-664 ◽

Cited By ~ 11

Author(s):

Xiaojing Bai ◽

Gang Lu ◽

Md Moinul Hossain ◽

Janos Szuhánszki ◽

Syed Sheraz Daood ◽

...

Keyword(s):

Process Monitoring ◽

Combustion Process ◽

Fuel Combustion ◽

Test Facility ◽

Random Weight ◽

Flame Imaging ◽

Multi Mode

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Process Monitoring and Fault Diagnosis of Penicillin Fermentation Based on Improved MICA

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.591-593.1783 ◽

2012 ◽

Vol 591-593 ◽

pp. 1783-1788 ◽

Cited By ~ 4

Author(s):

Zhi Yang Jia ◽

Pu Wang ◽

Xue Jin Gao

Keyword(s):

Fault Diagnosis ◽

Process Monitoring ◽

Gaussian Distribution ◽

Component Analysis ◽

Higher Order ◽

Process Variables ◽

Multivariate Gaussian Distribution ◽

Independent Components ◽

Multivariate Gaussian ◽

Penicillin Fermentation

In the process monitoring and fault diagnosis of batch processes, traditional principal component analysis (PCA) and least-squares (PLS), are assuming that the process variables are multivariate Gaussian distribution. But in the practical industrial process, the data observed of process variables do not necessarily be the multivariate Gaussian distribution. Independent component analysis (ICA), as a higher-order statistical method, is more suitable for dynamic systems. Observational data are decomposed into a linear combination of the independent components under statistical significance. The higher order statistics will be extracted and the mixed signals are decomposed into independent non-Gaussian components. Traditional method of ICA has to predefine the number of independent components. This paper proposed an improved MICA method of realizing the automatically choosing the independent components through setting the threshold value of the negentropy. The method can solve the problem of predefining the number of independent components in traditional methods and meanwhile it reduces the complexity of the monitoring model. The proposed method is used to do the process monitoring and fault diagnosis of penicillin fermentation and the results verify the feasibility and effectiveness of the method.

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