Date of Award

Spring 2006

Document Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Mechanical Engineering

Committee Director

Jen-Kuang Huang

Committee Member

Han Bao

Committee Member

Gene Hou

Committee Member

Brett A. Newman

Abstract

A U-tube water tank is first designed to roll a ship floating on still water. The 6-degree of freedom (DOF) dynamic model of U-tube tank is derived and the effects of its parameters on ship roll motion are studied. Numerical simulations show that the U-tube tank is an effective stimulator to roll the ship on still water. For a rolling ship, the U-tube tank can be used as a damper to reduce ship roll motion quickly.

Active control of ship roll motion with a proportional and derivative (PD) controller, linear quadratic regulator (LQR), generalized predictive control (GPC), and deadbeat predictive control (DPC) is studied using a U-tube water tank as actuator is studied. For the predictive control, system identification is applied to update the parameters of the linear ship roll model with a U-tube tank when the ship dynamics changes. Numerical simulations show that GPC has the best performance and the U-tube tank is effective in ship roll mitigation.

Nonlinear ship roll mitigation with passive U-tube tank, U-tube tank using feedback linearization with completely known system parameters, and U-tube tank using adaptive fuzzy feedback linearization control with unknown system parameters, are also studied. In numerical simulation, a passive U-tube tank and feedback linearization help to reduce ship roll motion and capsizing compared to a ship without the U-tube tank. Feedback linearization is the most effective means of controlling ship roll motion, and adaptive feedback linearization is more effective than a passive U-tube tank.

Rights

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

DOI

10.25777/4t78-f497

ISBN

9780542580383

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