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Vessel comprising transverse skirts

A technology for lateral sides and ships, which is applied in ship construction, ship parts, special-purpose ships, etc., and can solve problems such as roll

Inactive Publication Date: 2004-02-11
SINGLE BUOY MOORINGS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adjustments due to fluctuations in the system's roll hydrostatic stability, roll instability or parametric resonance may cause roll

Method used

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  • Vessel comprising transverse skirts
  • Vessel comprising transverse skirts
  • Vessel comprising transverse skirts

Examples

Experimental program
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Embodiment Construction

[0021] The length W1 of the barge 1 of FIG. 1 is 160 m, the width of the longitudinal side edges 2 , 3 is each 15 m, so that the total length W2 of the barge at the side edges is 190 m. The height H1 of the side edges 2 and 3 is 6m, the drawn water level H2 is 22m, and the deck level H3 is 32m. Due to the large amount of displacement when rolling, the high volume side edges add a large inertia to the rolling motion of the vessel, thus providing a greater natural rolling period.

[0022] On the barge 1 a drilling rig 5 is arranged on a drilling rig support structure 6 . A drill string 7 extends from the drilling rig 5 to the sea floor 33 . The drill string 7 and production risers 8, 9 are suspended from the deck 10. Deck 10 also supports blowout protection 11 . The deck is pivotally suspended on cables 13 , 14 running along sheaves 15 , 16 . The cables 13, 14 carry counterweights 17, 18 below the liquid level. The drill string 7 and production risers 8, 9 pass through a ce...

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PUM

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Abstract

The invention relates to a vessel having an elongated shape, and being moored to the sea bed in a substantially fixed orientation. The vessel comprises at least along its longitudinal sides, near keel level, two transverse skirts having such a width that the natural roll period of the vessel is above a predetermined period, the natural roll period of the vessel without the skirts being below said predetermined period.

Description

technical field [0001] The present invention relates to a vessel having an elongated shape and anchored to the sea bottom in a substantially fixed orientation. Background technique [0002] It is known that slender vessels, especially those with an aspect ratio of 1.5 or less, may suffer from roll instability or Mathieu instability. Rolling instability or parametric resonances may result in roll due to regulation due to fluctuations in the roll hydrostatic stability of the system. Especially when the natural period of heaving is half of the natural period of rolling, the most serious state will appear. Contents of the invention [0003] The object of the present invention is to devise a slender vessel, preferably of substantially rectangular shape, with improved stability. Another object of the invention is to design a slender vessel in which the rolling motion is reduced and the natural rolling period is increased. [0004] A further object of the present invention is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B3/44B63B9/08B63B35/44B63B39/00B63B39/06
CPCB63B35/4413B63B39/06B63B1/041B63B2039/067
Inventor 杰克·波拉克伦德特·波尔德瓦尔特马蒙·纳西里
Owner SINGLE BUOY MOORINGS INC
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