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Research Papers: Offshore Technology

Numerical Simulation for the Motion of the Flexible Floating Collision-Prevention System

[+] Author and Article Information
Xu-jun Chen

e-mail: cxjbox213@sohu.com

Xue-feng Tang

Engineering Institute of Corps of Engineers,
PLA University of Science and Technology,
Nanjing 210007, China

1Corresponding author.

Contributed by the Ocean Offshore and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received February 15, 2011; final manuscript received February 20, 2012; published online February 22, 2013. Assoc. Editor: Thomas E. Schellin.

J. Offshore Mech. Arct. Eng 135(1), 011303 (Feb 22, 2013) (9 pages) Paper No: OMAE-11-1014; doi: 10.1115/1.4006763 History: Received February 15, 2011; Revised February 20, 2012

The flexible floating collision-prevention system (FFSCS) is a valuable floating engineering structure that can be used to prevent the uncontrolled ships to collide with the non-navigational bridge of a large sea-crossing bridge. The system is composed of buoys, block chains, mooring chains and gravity anchors. The deformation of the system under the acting of an uncontrolled ship as well as the movement distance of the gravity anchors are important factors that should be considered by the system designers. Based on the analysis of the relationship between the forces and the deformation of each part of the system, the approximately static equations are solved by a new numerical iterative calculation method. The position changes of the buoys, the movements of the anchors and the history of the inner forces of the block chains when a ship collides with the FFSCS are obtained by iterative calculation. The good agreement between the numerical value and the results of the model test indicate that the small balance method is a validation on the motion response simulation of the FFSCS under the acting of the uncontrolled ship. The results validate that FFSCS can stop the uncontrolled ship before it arrives at the place of the bridge.

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Figures

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Fig. 2

Drafts of the mechanical analysis of FFSCS (forehead collision)

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Fig. 3

Drafts of the mechanical analysis of FFSCS (transverse collision)

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Fig. 4

Mechanics analysis draft of the buoys

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Fig. 5

Three types of chains acted on buoy and the mechanical analysis draft

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Fig. 6

Mechanic analysis draft of the anchor

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Fig. 7

Drafts of the collision ship for the two cases

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Fig. 8

Photo of model FFSCS in the test

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Fig. 9

Deformation of the system of the selected cases

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Fig. 10

Displacement comparisons of the anchors moving of forehead collision

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Fig. 11

Displacement comparisons of the anchors moving of transverse collision

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Fig. 12

Time histories of the block forces of 4 forehead collision cases

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