Nonlinear modelling and control of helicopters

Authors:
J. C. Avila Vilchis;B. Brogliato;A. Dzul;R. Lozano
Affiliations:
Universidad Autónoma del Estado de México, Facultad de Ingenierıa 50130 Toluca, Mexico;INRIA Rhône-Alpes ZIRST Montbonnot, 655 avenue de l'Europe 38334 Saint-Ismier, France;Université de Technologie de Compiègne BP 20529, HEUDIASYC UMR CNRS 6599 60205, Compiègne cedex, France;Université de Technologie de Compiègne BP 20529, HEUDIASYC UMR CNRS 6599 60205, Compiègne cedex, France
Venue:
Automatica (Journal of IFAC)
Year:
2003

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Abstract

This paper presents the development of a nonlinear model and of a nonlinear control strategy for a VARIO scale model helicopter. Our global interest is a 7-DOF (degree-of-freedom) general model to be used for the autonomous forward-flight of helicopter drones. However, in this paper we focus on the particular case of a reduced-order model (3-DOF) representing the scale model helicopter mounted on an experimental platform. Both cases represent underactuated systems (u@?R^4 for the 7-DOF model and u@?R^2 for the 3-DOF model studied in this paper). The proposed nonlinear model possesses quite specific features which make its study an interesting challenge, even in the 3-DOF case. In particular aerodynamical forces result in input signals and matrices which significantly differ from what is usually considered in the literature on mechanical systems control. Numerical results and experiments on a scale model helicopter illustrate the theoretical developments, and robustness with respect to parameter uncertainties is studied.