Global Responses of Struck Ships in Collision With Emphasis on Hydrodynamic EffectsSource: Journal of Offshore Mechanics and Arctic Engineering:;2015:;volume( 137 ):;issue: 004::page 41601DOI: 10.1115/1.4030343Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Hydrodynamic effects in ship collisions are usually considered by increased inertia force in the form of the equivalent added mass. It is necessary to reasonably estimate the equivalent added mass to calculate energy absorbed by ships in collisions. In this paper, motion equations in the horizontal plane for the struck rigid ship are first established considering hydrodynamic effects in the form of added mass, linear, and quadratic damping. The equivalent added mass are obtained in three ways and analyzed. It is shown that the equivalent added mass for the sway motion depends on not only the duration of collision impact, impact force, but also the collision position, while the equivalent added mass for the yaw motion could be assumed to be independent of the collision position. In addition, a simple formula is proposed to relate the equivalent added mass for part of the vessel to that of the whole vessel, provided that the underwater area of the transverse section is known. As a consequence, it is possible to estimate rigid hull girder responses based on the simplified methodology, which could be used in design and probabilistic collision analyses. In the end, the hull girder responses are estimated considering both a flexible and rigid vessel. Comparisons are made between rigid and flexible hull girder responses.
|
Show full item record
contributor author | Jia, Huirong | |
contributor author | Moan, Torgeir | |
date accessioned | 2017-05-09T01:22:45Z | |
date available | 2017-05-09T01:22:45Z | |
date issued | 2015 | |
identifier issn | 0892-7219 | |
identifier other | omae_137_04_041601.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/159383 | |
description abstract | Hydrodynamic effects in ship collisions are usually considered by increased inertia force in the form of the equivalent added mass. It is necessary to reasonably estimate the equivalent added mass to calculate energy absorbed by ships in collisions. In this paper, motion equations in the horizontal plane for the struck rigid ship are first established considering hydrodynamic effects in the form of added mass, linear, and quadratic damping. The equivalent added mass are obtained in three ways and analyzed. It is shown that the equivalent added mass for the sway motion depends on not only the duration of collision impact, impact force, but also the collision position, while the equivalent added mass for the yaw motion could be assumed to be independent of the collision position. In addition, a simple formula is proposed to relate the equivalent added mass for part of the vessel to that of the whole vessel, provided that the underwater area of the transverse section is known. As a consequence, it is possible to estimate rigid hull girder responses based on the simplified methodology, which could be used in design and probabilistic collision analyses. In the end, the hull girder responses are estimated considering both a flexible and rigid vessel. Comparisons are made between rigid and flexible hull girder responses. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Global Responses of Struck Ships in Collision With Emphasis on Hydrodynamic Effects | |
type | Journal Paper | |
journal volume | 137 | |
journal issue | 4 | |
journal title | Journal of Offshore Mechanics and Arctic Engineering | |
identifier doi | 10.1115/1.4030343 | |
journal fristpage | 41601 | |
journal lastpage | 41601 | |
identifier eissn | 1528-896X | |
tree | Journal of Offshore Mechanics and Arctic Engineering:;2015:;volume( 137 ):;issue: 004 | |
contenttype | Fulltext |