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Motion simulation of a naval vessel with forward speed in rough sea

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dc.contributor.advisor Islam, Dr. M. Rafiqul
dc.contributor.author Munir Hassan, Md.
dc.date.accessioned 2015-11-21T11:34:15Z
dc.date.available 2015-11-21T11:34:15Z
dc.date.issued 2003-09
dc.identifier.uri http://lib.buet.ac.bd:8080/xmlui/handle/123456789/1279
dc.description.abstract Solving problems of ship hydrodynamics took a lot of attention during the last few decades. In case of a floating ship, the interaction between the body of the ship and the incoming waves is quite important for designing the structure of the ship as well as during operation of the ship at sea The hydrodynamic coefficients and the wave exciting forces and moments acting on the body of the ship operating at rough sea have significant influence to the six degrees of motions of the ship. The forward speed of the ship will also have significant effcLi on those forces and moments and hence motions. Most of the research works in this field were carried out mainly on the fuller vessels. Such work on a fme shaped vessel like naval ship is limited. So in this present research work, considerable effort has been given to develop a computer program to predict and simulate the motions of a naval ship operating in a rough sea conditions at the Bay of Bengal. The behaviour of the ship at diffL'fcnt sea conditions were predicted and time domain simulation of motions were carried out. The motions were also simulated by using long crested waves having different wave height, different ship speed and the wave spectrum of the Bay of Bengal. The present research work mainly focuses on the prediction and simulation of oscillations/motions of a naval ship which is presently operating in the Bangladesh territorial water and Exclusive Economic Zone, \ I • Hydrodynamic coefficients and wave exciting forces and moments were calculated in regular waves and by utilizing these results, the six degrees of motions of the said naval ship were predicted and simulated in irregular long crested waves. [0 order to verify the accuracy of the numerical code developed in the present work, results of experimental as well as practical works of the said naval vessel was not found available in the published papers/literature. However, a Series 60 vessel of block co-efficient 0.60 was selected and hydrodynamic coefficients and wave exciting forces and moments were calculated using the same program and compared with the published results and was found in good agreement. From this research, it has been found that the ship can run smoothly up to sea state 3 with the ship speed up to 22.8 knots if both heave and pitch motions are considered at the same time. Considering the heave and pitch effect separately, the ship can run up to sea state 5 with ship speed up to 22.8 knots, up to sea state 6 with ship speed 18.2 knots and up to sea state 7 with ship speed 11.5 knots. Beyond this limit ship will face high surge/heave/pitch motion and the propeller tip may come out of the still water level. The trend of the results shows that it would be safer to increase ship speed up to certain sea state which will decrease motions but beyond that limit, with the increase of sea state, it would be better to decrease ship speed. en_US
dc.language.iso en en_US
dc.publisher Department of Naval Architecture and Marine Engineering, BUET en_US
dc.subject Hydrodynamics - Bay of Bengal en_US
dc.title Motion simulation of a naval vessel with forward speed in rough sea en_US
dc.type Thesis-MSc en_US
dc.contributor.id 100112003 en_US
dc.identifier.accessionNumber 98687
dc.contributor.callno 532.50954923/MUN/2003 en_US

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