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TECHNICAL PAPERS

Experimental Investigation of the Shipping of Water on the Bow of a Containership

[+] Author and Article Information
Nuno Fonseca, C. Guedes Soares

Unit of Marine Technology and Engineering, Technical University of Lisbon, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa, Portugal

J. Offshore Mech. Arct. Eng 127(4), 322-330 (Mar 25, 2005) (9 pages) doi:10.1115/1.2087527 History: Received September 27, 2004; Revised March 25, 2005

The paper presents the results of an experimental investigation of the shipping of water on the bow of a containership. Model tests were carried out in head regular and irregular waves of large amplitude, and measurements were taken of: the absolute and relative motions, the structural loads, the height of water and the impact pressure on the deck, and the horizontal impact pressure and total force on the first line of containers on the bow.

Copyright © 2005 by American Society of Mechanical Engineers
Topics: Force , Motion , Waves , Water , Ships
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Figures

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Figure 1

Containership bodylines

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Figure 2

Detail of the box installed on the deck and position of the pressure transducers

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Figure 3

Heave and pitch amplitudes of the transfer function

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Figure 4

Comparison of heave first harmonic amplitudes for the S175 containership and the present ship, as a function of the wave steepness

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Figure 5

Comparison of the bodylines of the present containership (dashed lines) and the S175 containership (continuous lines). For comparative purposes, one of the hulls was scaled such that both ships have the same breadth.

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Figure 6

Amplitudes of the relative motion at stations 20 and 18

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Figure 7

Second harmonic amplitudes of the relative motions at stations 20 and 18

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Figure 8

Time record of the relative motion at station 20 and the first harmonic of the same time signal. Head regular waves with λ∕Lpp=1.2 and kζa=0.106.

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Figure 19

Correlation between the height of water on deck at point A and the freeboard exceedance at station 20

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Figure 9

Peaks and mean values of the relative motion at stations 20 and 19

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Figure 10

Correlation between the height of water on deck and the pressure on the deck (regular waves)

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Figure 11

Correlation between the height of water on deck and the pressure on the box (regular waves)

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Figure 12

Correlation between the height of water on deck and the impact force on the box (regular waves)

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Figure 13

Time records of wave elevation, heave, pitch, relative motion at station 20, and height of water on deck at point A. Head regular waves with λ∕Lpp=1.2 and kζa=0.106.

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Figure 14

Record of the ship responses in irregular waves (Hs=8.0m and Tp=12s)

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Figure 15

Detail of the shipping of water and impact pressures and forces on deck

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Figure 16

Correlation between the height of water on deck and the pressure on the deck (irregular waves)

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Figure 17

Correlation between the height of water on deck and the pressure on the box (irregular waves)

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Figure 18

Correlation between the height of water on deck and the impact force on the box (irregular waves)

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