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Seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation

Small Waterplane Area Twin Hull (SWATH) and Catamaran vessels are known to have more stable platform as compared to mono-hulls. A further advantage of SWATH as compared to Catamaran is its smaller waterplane area that provides better seakeeping qualities. However, the significant drawback of the SWA...

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Main Author: Ahmad Fitriadhy, Ahmad Fitriadhy
Format: Thesis
Language:English
Published: 2007
Subjects:
TJ Mechanical engineering and machinery
Online Access:http://eprints.utm.my/id/eprint/9682/1/AhmadFitriadhyMFKM2007.pdf
http://eprints.utm.my/id/eprint/9682/
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spelling my.utm.96822018-08-30T08:03:57Z http://eprints.utm.my/id/eprint/9682/ Seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation Ahmad Fitriadhy, Ahmad Fitriadhy TJ Mechanical engineering and machinery Small Waterplane Area Twin Hull (SWATH) and Catamaran vessels are known to have more stable platform as compared to mono-hulls. A further advantage of SWATH as compared to Catamaran is its smaller waterplane area that provides better seakeeping qualities. However, the significant drawback of the SWATH vessel is when encountering head-sea at high forward speed. Due to its low stiffness, it has a tendency for large pitch motions. Consequently, this may lead to excessive trim or even deck wetness. This phenomenon will not only degrade the comfortability but also results in structural damage with greater safety risks. In this research a modified SWATH design is proposed. The proposed design concept represents a combination of Catamaran and SWATH hull features that will lead to reduce in bow diving but still maintains good seakeeping capabilities. This is then called the Semi-SWATH vessel. In addition, the full-design of this vessel has been equipped by fixed fore fins and controllable aft fins attached on each lower hull. In the development of controllable aft fins, the PID controller system was applied to obtain an optimal vessel’s ride performance at speeds of 15 (medium) and 20 (high) knots. In this research work, the seakeeping performance of Semi-SWATH vessel was evaluated using time-domain simulation approach. The effect of fin stabilizer on the bare hull performance is considered. The validity of numerical evaluation was then compared with model experiments carried out in the Towing Tank at Marine Technology Laboratory, UTM. It was shown that the Semi-SWATH vessel with controllable fin stabilizer can have significantly reduction by about 42.57% of heave motion and 48.80% of pitch motion. 2007-01 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/9682/1/AhmadFitriadhyMFKM2007.pdf Ahmad Fitriadhy, Ahmad Fitriadhy (2007) Seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation. Masters thesis, Universiti Teknologi Malaysia, Faculty of Mechanical Engineering. http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:54868
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Ahmad Fitriadhy, Ahmad Fitriadhy
Seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation
description Small Waterplane Area Twin Hull (SWATH) and Catamaran vessels are known to have more stable platform as compared to mono-hulls. A further advantage of SWATH as compared to Catamaran is its smaller waterplane area that provides better seakeeping qualities. However, the significant drawback of the SWATH vessel is when encountering head-sea at high forward speed. Due to its low stiffness, it has a tendency for large pitch motions. Consequently, this may lead to excessive trim or even deck wetness. This phenomenon will not only degrade the comfortability but also results in structural damage with greater safety risks. In this research a modified SWATH design is proposed. The proposed design concept represents a combination of Catamaran and SWATH hull features that will lead to reduce in bow diving but still maintains good seakeeping capabilities. This is then called the Semi-SWATH vessel. In addition, the full-design of this vessel has been equipped by fixed fore fins and controllable aft fins attached on each lower hull. In the development of controllable aft fins, the PID controller system was applied to obtain an optimal vessel’s ride performance at speeds of 15 (medium) and 20 (high) knots. In this research work, the seakeeping performance of Semi-SWATH vessel was evaluated using time-domain simulation approach. The effect of fin stabilizer on the bare hull performance is considered. The validity of numerical evaluation was then compared with model experiments carried out in the Towing Tank at Marine Technology Laboratory, UTM. It was shown that the Semi-SWATH vessel with controllable fin stabilizer can have significantly reduction by about 42.57% of heave motion and 48.80% of pitch motion.
format Thesis
author Ahmad Fitriadhy, Ahmad Fitriadhy
author_facet Ahmad Fitriadhy, Ahmad Fitriadhy
author_sort Ahmad Fitriadhy, Ahmad Fitriadhy
title Seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation
title_short Seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation
title_full Seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation
title_fullStr Seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation
title_full_unstemmed Seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation
title_sort seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation
publishDate 2007
url http://eprints.utm.my/id/eprint/9682/1/AhmadFitriadhyMFKM2007.pdf
http://eprints.utm.my/id/eprint/9682/
http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:54868
_version_ 1643645225001811968
score 13.211869

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