Conference article

Identification Scheme for the Nonlinear Model of an Electro-Hydraulic Actuator

W.C. Leite Filho
Space Mechanics and Control Division, Instituto Nacional de Pesquisas Espaciais, Brazil

J. Guimaraes
Space Mechanics and Control Division, Instituto Nacional de Pesquisas Espaciais, Brazil

Download articlehttp://dx.doi.org/10.3384/ecp17142789

Published in: Proceedings of The 9th EUROSIM Congress on Modelling and Simulation, EUROSIM 2016, The 57th SIMS Conference on Simulation and Modelling SIMS 2016

Linköping Electronic Conference Proceedings 142:115, p. 789-793

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Published: 2018-12-19

ISBN: 978-91-7685-399-3

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

This work presents the building of a nonlinear model of an electro-hydraulic actuator in order to understand the limit cycle phenomenon that appears when it is used in a closed loop control system. Previously, a first harmonic analysis had been used to identify that system, but the results were unsatisfactory. Therefore, this work aims to build on that model with the use of Fast Fourier Transforms as a way to recognize previously unseen nonlinearities. Hardware in the loop tests are then used in order to find the proper parameters that create a particular limit cycle. Simulation results show that such approach is successful.

Keywords

nonlinear model, FFT, hardware in the loop, actuator model

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