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A novel restraining system for a powerless advancing ship: a combined theoretical and experimental investigation

A novel restraining system for a powerless advancing ship: a combined theoretical and experimental investigation
A novel restraining system for a powerless advancing ship: a combined theoretical and experimental investigation
A novel flexible restraining system is proposed to protect a waterway crossing road, a railway, or a combined bridge when a powerless advancing ship approaches such a structure. Direct collision with principal bridge supports is not addressed under the assumption that the restraining system is located some distance upstream of the non-navigational bridge, assuming the ship cannot engage propulsive system in reverse to reduce the speed of ship advance. Ship-independent seabed-located gravity anchors are to be ultimately dragged to dissipate ship kinetic energy. A mathematical model of the proposed method of restraint is developed and the resulting movements of ship and anchors are predicted for two distinct ship forms. These ships' responses are investigated for initial ship velocity, angle of approach, and point of contact with restraining cable of different investigated spans in the presence and absence of a current. The theoretical simulations agree reasonably well with the related model measurements given the existence of ship sway and yaw motions are not addressed. The results are sufficient to demonstrate the applicability of the proposed system. Predictions and observations suggest that the smaller the restraining cable span and the closer the ship is located to the anchors (initially vertically below the ends of the restraining cable), the more effective is the retraining process.
0892-7219
1-14
Chen, Xujun
e624a41f-1406-4812-82d4-f06e6880aa5c
Liu, Junyi
7993d7d4-9623-4ab2-b26a-35dd8d19ec9a
Hearn, Grant
c1b2912b-fe5c-432c-aaa4-39c5eff75178
Xiong, Yeping
51be8714-186e-4d2f-8e03-f44c428a4a49
Wu, Guang-huai
d8c2d319-96e7-4f01-b46d-01694d86d843
Chen, Xujun
e624a41f-1406-4812-82d4-f06e6880aa5c
Liu, Junyi
7993d7d4-9623-4ab2-b26a-35dd8d19ec9a
Hearn, Grant
c1b2912b-fe5c-432c-aaa4-39c5eff75178
Xiong, Yeping
51be8714-186e-4d2f-8e03-f44c428a4a49
Wu, Guang-huai
d8c2d319-96e7-4f01-b46d-01694d86d843

Chen, Xujun, Liu, Junyi, Hearn, Grant, Xiong, Yeping and Wu, Guang-huai (2017) A novel restraining system for a powerless advancing ship: a combined theoretical and experimental investigation. Journal of Offshore Mechanics and Arctic Engineering, 139 (1), 1-14. (doi:10.1115/1.4034821).

Record type: Article

Abstract

A novel flexible restraining system is proposed to protect a waterway crossing road, a railway, or a combined bridge when a powerless advancing ship approaches such a structure. Direct collision with principal bridge supports is not addressed under the assumption that the restraining system is located some distance upstream of the non-navigational bridge, assuming the ship cannot engage propulsive system in reverse to reduce the speed of ship advance. Ship-independent seabed-located gravity anchors are to be ultimately dragged to dissipate ship kinetic energy. A mathematical model of the proposed method of restraint is developed and the resulting movements of ship and anchors are predicted for two distinct ship forms. These ships' responses are investigated for initial ship velocity, angle of approach, and point of contact with restraining cable of different investigated spans in the presence and absence of a current. The theoretical simulations agree reasonably well with the related model measurements given the existence of ship sway and yaw motions are not addressed. The results are sufficient to demonstrate the applicability of the proposed system. Predictions and observations suggest that the smaller the restraining cable span and the closer the ship is located to the anchors (initially vertically below the ends of the restraining cable), the more effective is the retraining process.

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More information

Accepted/In Press date: 21 August 2016
e-pub ahead of print date: 29 November 2016
Published date: February 2017
Organisations: Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 404276
URI: https://eprints.soton.ac.uk/id/eprint/404276
ISSN: 0892-7219
PURE UUID: 0ceae672-9e07-4ce8-86be-bd74d2c92f0b
ORCID for Yeping Xiong: ORCID iD orcid.org/0000-0002-0135-8464

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Date deposited: 05 Jan 2017 11:39
Last modified: 06 Jun 2018 12:51

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