Title page for ETD etd-32198-94431

Type of Document

Master's Thesis

Author

Treakle, Thomas W. III

Author's Email Address

THOMAS.W.TREAKLE.II@saic.com

URN

etd-32198-94431

Title

A Time-Domain Numerical Study of Passive and Active Anti-Roll Tanks to Reduce Ship Motions

Degree

Master of Science

Department

Ocean Engineering

Advisory Committee

Advisor Name	Title
Liapis, Stergios I.
Nayfeh, Ali H.
Neu, Wayne L.
Mook, Dean T.	Committee Chair

Keywords

Anti-Roll Tank
Roll Motion
Stabilizing Devices
Ship
Control

Date of Defense

1998-04-03

Availability

unrestricted

Abstract

Time-domain simulations were performed to investigate the influence of

passive and active anti-roll tanks and moving weights on ship motions. A

point mass moving across the ship was used to model the non-linear effects

of the tank systems in various computer simulation environments. PID

control of the mass position was used for the active tank (pump) systems

and a vibration absorber was used for the passive tank systems. A

single-degree-of-freedom non-linear code was developed to investigate the

influence of various coefficients and control strategies. The final active

and passive tank system implementations were included in the LAMP code

developed by SAIC. Results of the time-domain simulations are shown, which

indicate the effectiveness of these types of roll control systems.

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