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Underactuated ships follow smooth paths with Integral actions and without velocity measurements for feedback: theory and experiments

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2 Author(s)
Do, K.D. ; School of Mech. Eng., Univ. of Western Australia, Crawley, WA, Australia ; Pan, J.

Steering a ship along a desired path with a prescribed forward speed is a vitally important issue in many offshore applications. This paper presents a global controller that forces a ship without a sway actuator to follow a reference path and without velocity measurements for feedback. Nonlinear damping terms are also included to cover both low- and high-speed applications. Integral actions are added to the controller to compensate for a constant bias of environmental disturbances. Experimental results on a model ship illustrate the effectiveness of the proposed method.

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Control Systems Technology, IEEE Transactions on  (Volume:14 ,  Issue: 2 )