Nonlinear SISO System Identification Applied to the Series System Power-Driver, DC-Motor and Propeller

Abstract

Consulta en la Biblioteca ETSI Industriales (Riunet)

[EN] In this report is proposed a least squares methodology to estimate the parameters of a non-linear system composed by one Power Driver, one DC Motor and one Propeller. The input of the system is the reference power and the output is the rotation speed of the two blades propeller. Two parametrizations are considered. The parametrizations differ whether the main non linear effect is associated to (i) the propeller, or (ii) the power driver. In addition, the estimation process is assessed based in a sensitivity analysis. This analysis is performed using a numerical procedure where Gaussian noise is added to the response of a simulated system, and then the system parameters are recomputed based in the noisy data. Data acquired from a real system is used to test the parameters estimation methodology. Then, the estimation results are used to assess whether the real system has a non-linear effect more, or lesser, severe in the power driving or the propeller. The sensitive analysis is performed on the best fitting model.