Title :
Underactuated ship global tracking without measurement of velocities
Author :
Do, K.D. ; Pan, J.
Author_Institution :
Sch. of Mech. Eng., Western Australia Univ., Nedlands, WA, Australia
Abstract :
A new global output-feedback controller for tracking control of an underactuated surface ship with only surge force and yaw moment available and without measurements of velocities. The reference trajectory to be tracked is allowed to be a curve including a straight-line. A global nonlinear coordinate change is introduced to transform the ship dynamics to a system affine in the ship velocities. A global nonlinear exponential observer is proposed to estimate unmeasured velocities. The controller development is based on the Lyapunov direct method and backstepping technique, and utilizes the passive property of ship dynamics and their interconnected structure.
Keywords :
Lyapunov methods; feedback; nonlinear control systems; observers; position control; ships; tracking; velocity control; backstepping technique; interconnected structure; nonlinear exponential observer; output feedback controller; reference trajectory; ship dynamics; ship velocity; surge force; tracking control; underactuated ship global tracking; underactuated surface ship; velocity measurement; yaw moment; Backstepping; Force control; Force measurement; Lagrangian functions; Marine vehicles; Nonlinear dynamical systems; Sea surface; Surges; Trajectory; Velocity measurement;
Conference_Titel :
American Control Conference, 2003. Proceedings of the 2003
Print_ISBN :
0-7803-7896-2
DOI :
10.1109/ACC.2003.1243370
