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

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.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Ocean Engineering

Department dc:contributor.department

Ocean Engineering

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

1998

Author dc:creator

• Treakle, Thomas W. III

Chair dc:contributor.committeechair

• Mook, Dean T.

Committee members dc:contributor.committeemember

• Liapis, Stergios I.
• Nayfeh, Ali H.
• Neu, Wayne L.

• Anti-Roll Tank
• Roll Motion
• Stabilizing Devices
• Ship
• Control

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Dc Identifier Other

etd-32198-94431

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/36610