NARMAX model identification using a randomised approach Online publication date: Tue, 02-Apr-2019
by Pedro Felipe Leite Retes; Luis Antonio Aguirre
International Journal of Modelling, Identification and Control (IJMIC), Vol. 31, No. 3, 2019
Abstract: Structure selection is one of the most critical steps in nonlinear system identification. A large family of methods, based on model prediction error, use concepts and tools from linear algebra. Other methods, based on model simulation error, have to deal with non-convex optimisation problems. More recently a family of methods have been put forward that has probabilistic setting. The randomised algorithm for model structure selection (RaMSS) belongs to this family and it has been shown to be effective to select regressors for NARX models. In the present paper, such a method is extended to cope with NARMAX models. The performance of the proposed method is illustrated using simulated and experimental data. It is shown that the proposed method is capable of correctly selecting model structures from simulation data. The method was also applied to experimental data with successful results.
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