Controle por modos deslizantes aplicado a sistema de posicionamento dinâmico. / Sliding mode control applied to dynamic positioning systems.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This paper presents the application of the robust and nonlinear sliding mode control theory to the dynamic positioning systems for floating vessel, with experimental validation. The objective of the control system designed is to keep the vessel next a specific position (set-point) or follow a pre-defined trajectory (pathfollowing) through the action of propellers, in the presence of wind, waves and current external disturbances. In principle numerical simulations were carried out with the system designed to verify its performance. The simulator used was implemented in a Matlab / Simulink, considering the dynamics of the vessel and environmental agents. The simulations consisted of maneuvers carried out in nominal condition and in the absence of environmental efforts, with the vessel full and empty (ballasted). In order to validate the algorithm, small scale experiments were done, considering maneuvers in both calm and windy conditions, with the vessel at full or ballasted load. The tests were conducted at the laboratory of the Naval and Ocean Engineering Department (DENO) of the University of São Paulo. The sliding mode control was robust to variations in environmental conditions (wind), keeping the performance and stability. It was verified that the adjustment of controller parameters can be easily done, using mathematical equations. Moreover, the nonlinear structure of the controller and its robustness properties ensure the performance and stability for a large range of environmental conditions and maneuvers carried out with the vessel.

ASSUNTO(S)

embarcações nonlinear control sistemas de controle (aplicações) dynamic positioning sistemas de posicionamento dinâmico sliding mode control

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