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The Effect of Nonlinearity Measure on Model Order Selection in Identification of Chemical Processes

International Journal of Computer Applications
© 2011 by IJCA Journal
Number 1 - Article 1
Year of Publication: 2011
Mohammad Rezaee Yazdi
Hooshang Jazayerirad

Mohammad Rezaee Yazdi and Hooshang Jazayerirad. Article:The Effect of Nonlinearity Measure on Model Order Selection in Identification of Chemical Processes. International Journal of Computer Applications 32(8):1-5, October 2011. Full text available. BibTeX

	author = {Mohammad Rezaee Yazdi and Hooshang Jazayerirad},
	title = {Article:The Effect of Nonlinearity Measure on Model Order Selection in Identification of Chemical Processes},
	journal = {International Journal of Computer Applications},
	year = {2011},
	volume = {32},
	number = {8},
	pages = {1-5},
	month = {October},
	note = {Full text available}


Most processes in chemical industry reveal nonlinear behavior. A key requirement for many advanced process control is the availability of an accurate dynamic model, with lowest order, for process. This paper handles the problem of model order selection in non-linearity chemical processes identification procedure. In this respect a ‘nonlinearity test’ method and four model order selection criteria known as the Aikaike Information Criterion (AIC), the Minimum Description Length (MDL), the Exponentially Embedded Family (EEF) and Unmodeled Output Variation (UOV) are considered. The abilities of these criteria in determining the order of the model subjected to different levels of nonlinearity are compared. For this purpose, two chemical processes: a two-tank system and a continuous stirred tank reactor (CSTR) with different levels of nonlinearity are employed. It has been shown that in a system with high level of nonlinearity, the UOV criterion is able to select the lowest order model compared to the other criteria.


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