NDLI: Global Responses of Struck Ships in Collision With Emphasis on Hydrodynamic Effects

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Jia, Huirong Moan, Torgeir
Copyright Year	2010
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.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	225
Ending Page	236
Page Count	12
File Format	PDF
ISBN	9780791849095
DOI	10.1115/OMAE2010-20336
e-ISBN	9780791838730
Volume Number	29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 1
Conference Proceedings	ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2010-06-06
Publisher Place	Shanghai, China
Access Restriction	Subscribed
Subject Keyword	Damping Design Collisions (physics) Inertia (mechanics) Ships Vessels Equations of motion Girders Yaw Hull
Content Type	Text
Resource Type	Article

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