Roll stabilization for fast monohulls by using passive and active lifting appendages

Roll stabilization for monohulls is an important issue in naval architecture. Several methods including roll stabilization tanks, active control fins, rudder roll stabilization systems, and bilge keels are commonly used for roll stabilization purposes and each one of them has its own advantages and disadvantages. In this thesis roll stabilization is studied by using passive and active roll stabilization configurations with hydrofoils. The main objective of this research is to identify an effective roll stabilization system for use on high- speed monohull vessels. The analysis of the performance of a passive hydrofoil configuration is used as a starting point for the development of active control mechanisms. A generic fast monohull was created for study purposes and the SWAN-2 code (ShipWaveANalysis), a state-of-the-art time domain simulation program, was used for the analysis of the linear free-surface flow around the vessel. Simulations were carried out in regular waves incident at angles ranging from 90⁰, 105⁰,120⁰,135⁰ and 150⁰ degrees relative to the ship axis, 900 being beam waves and 180⁰ degree being head waves. The ship was equipped with a hydrofoil fixed amidships, quarter to aft and aft to determine the sensitivity of roll motion on the longitudinal position of the lifting appendage.

Department dc:contributor.department

Massachusetts Institute of Technology. Dept. of Ocean Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2004

Author dc:creator

• Ulusoy, Talha

Advisor dc:contributor.advisor

• Paul D. Sclavounos.

• Ocean Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/33430

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/33430