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
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id	my-utm-ep.9682
record_format	uketd_dc
spelling	my-utm-ep.96822018-08-30T08:03:57Z Seakeeping evaluation of semi-swath vessel in head-seas using time domain simulation 2007-01 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 vesselâ€™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 http://eprints.utm.my/id/eprint/9682/ http://eprints.utm.my/id/eprint/9682/1/AhmadFitriadhyMFKM2007.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:54868 masters Universiti Teknologi Malaysia, Faculty of Mechanical Engineering Faculty of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
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 vesselâ€™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
qualification_level	Master's degree
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
granting_institution	Universiti Teknologi Malaysia, Faculty of Mechanical Engineering
granting_department	Faculty of Mechanical Engineering
publishDate	2007
url	http://eprints.utm.my/id/eprint/9682/1/AhmadFitriadhyMFKM2007.pdf
_version_	1747814776176640000

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

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