The 7th IFAC Symposium on Intelligent Autonomous Vehicles 2010

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A Path Following Controller for the Dynamic Model of a Marine Surface Vessel

Alessandro Antonio Zizzari
Centro Cultura Innovativa d'Impresa - Universita' del Salento
Italy

Paola Pedone
Dipartimento di Ingegneria dell'Innovazione - Universita' del Salento
Italy

Giovanni Indiveri
Dipartimento di Ingegneria dell'Innovazione - Universita' del Salento
Italy

Abstract:
A path following controller for the dynamic model of an underactuated marine vessel is presented. The solution extends previous results relative to the purely kinematics case and is able to cope with constant and known ocean currents. Based on kinematics, a reference linear and angular velocity is computed such that if the vehicle had such velocities the path following problem would be asymptotically solved. Then, applying feedback linearization to the dynamic model of the surface vessel, yaw torque and surge force commands are computed in order to drive the vessels total velocity on the desired reference values. The resulting control laws for the yaw and surge degrees of freedom result in nonlinear terms (from feedback linearization) and PI terms. The time derivative of the side slip angle is assumed to be slowly varying, hence the side slip acceleration is neglected. Numerical simulations are provided to validate the proposed approach.

 

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