Effect of Drag-Reducing Air Lubrication on Underwater Noise Radiation From Ship Hulls

[+] Author and Article Information
Konstantin I. Matveev

 Art Anderson Associates, 202 Pacific Avenue, Bremerton, WA 98337matveev@hydrofoils.org

J. Vib. Acoust 127(4), 420-422 (Nov 22, 2004) (3 pages) doi:10.1115/1.1924646 History: Received June 02, 2004; Revised November 22, 2004

As the speed and power of surface ships rise, the reduction of ship acoustic signature and self-noise is becoming an important task of naval engineering. A significant decrease in underwater noise can be achieved by using gaseous layers on the ship hull. Two mechanisms for sound radiation from low-drag air-lubricated hulls are discussed.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Displacement-type air cavity ship. 1 air cavity, 2 air blower, 3 gas pipeline, and 4 waterline

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Figure 2

Airborne noise transmission into water through the air-lubricated hull

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Figure 3

Transmission loss of airborne noise through the hull with air cavity. Thickness of air layer: 5cm, solid line; 30cm, dotted line; no air cavity, dashed line.

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Figure 4

Transmission loss of airborne noise through the hull with bubbly layer. Bubble radius: 500μm, solid line; 50μm, dotted line; no bubbles, dashed line.

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Figure 5

A schematic of underwater sound radiation by flexural waves

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Figure 6

Power loss of sound emitted by flexural waves in the presence of (a) air cavity and (b) bubbly layer




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