Acoustic insertion loss by a bubble layer for the application to air bubble curtain and air masker

Cheolsoo Park; So Won Jeong; Gun Do Kim; Ilsung Moon; Geuntae Yim

doi:10.7776/ASK.2020.39.4.227

All Issue

2020 Vol.39, Issue 4 Next Page

Research Article

Acoustic insertion loss by a bubble layer for the application to air bubble curtain and air masker 기포층 음향 삽입손실 연구: 기포커튼과 에어마스커

31 July 2020. pp. 227-236

PDF XML

Abstract

This paper derives the insertion loss for the bubble layer of an air bubble curtain and an air masker which are used to reduce ocean anthropogenic noise such as the piling noise and the ship noise. The air bubble curtain is considered as a ‘fluid-air bubble layer-fluid’ model and the environment for the air masker is simplified as an ‘vacuum-thin plate-fluid-air bubble layer-fluid’ model. The air bubble layer in each model is assumed as the effective medium which has the complex wavenumber and the complex impedance corresponding to the bubble population distribution. The numerical simulations are performed to examine the insertion loss depending on the bubble population, the void fraction, and the thickness of the layer.

Keywords

Insertion loss

Bubble layer

Effective medium

Air bubble curtain

Air masker

해양구조물의 파일링 소음을 줄이기 위한 기포커튼과 선체 진동에 의한 수중방사소음 차단을 위한 에어마스커에 대하여 각각의 삽입손실 해석해를 유도하였다. 해석해를 구하기 위해 기포커튼과 에어마스커를 각각 ‘유체-기포층-유체’ 그리고 ‘진공-평판-유체-기포층-유체’의 단순 모델로 가정하였고, 각 모델에서 해당 기포층을 복소수 형태의 파수와 임피던스로 규정된 유효매질로 치환하였다. 수치 모의를 통해 기포의 분포, 기포율, 그리고 기포층의 두께에 따른 삽입손실의 특성을 살펴보았다.

키워드

삽입손실

기포층

유효매질

기포커튼

에어마스커

References

IFAW (International Fund for Animal Welfare), "Ocean noise: Turn it down: A report on ocean noise pollution," IFAW, Tech. Rep., 2008.

W. J. Richardson, C. R. Greene, Jr., C. I. Malme, and D. H. Thomson, Marine Mammals and Noise (Academic Press, New York, 1995), pp. 101-158.

10.1016/B978-0-08-057303-8.50009-47799009

B. Würsig, C. R. Greene, and T. A. Jefferson, "Development of an air bubble curtain to reduce underwater noise of percussive piling," Marine Environmental Research, 49, 79-93 (2000).

10.1016/S0141-1136(99)00050-1

J. C. Kim, B. H. Heo, and D. S. Cho, "Noise reduction effect of an air bubble layer on an infinite flat plate considering the noise of multi-bubbles" (in Korean), Trans. Korean Soc. Noise Vib. Eng. 19, 1222-1230 (2009).

10.5050/KSNVN.2009.19.11.1222

S.-H. Ko, S. Pyo, and W. Seong, Structure-Borne and Flow Noise Reductions (Mathematical Modeling) (Seoul National University Press, Seoul, 2001), pp. 53-94.

L. L. Foldy, "The multiple scattering of waves," Phys. Rev. 67, 107-119 (1945).

10.1103/PhysRev.67.107

K. W. Commander and A. Prosperetti, "Linear pressure waves in bubbly liquids: Comparison between theory and experiments," J. Acoust. Soc. Am. 85, 732-746 (1989).

10.1121/1.397599

M. C. Junger and J. E. Cole, "Bubble swarm acoustics: Insertion loss of a layer on a plate," J. Acoust. Soc. Am. 68, 241-247 (1980).

10.1121/1.384631

K. M. Göttsche, P. M. Juhl, and U. Steinhagen, "Numerical prediction of underwater noise reduction during offshore pile driving by a small bubble curtain," Proc. Inter-Noise, 1-10 (2013).

A. Tsouvalas and A. V. Metrikine, "Noise reduction by the application of an air-bubble curtain in offshore pile driving," J. Sound Vib. 371, 150-170 (2016).

10.1016/j.jsv.2016.02.025

J. Rustemeier, T. Grießmann, and R. Rolfes, "Underwater sound mitigation of bubble curtains with different bubble size distributions," Proc. Meetings on Acoustics ECUA2012, 1895-1902 (2012).

10.1121/1.4772936

L. M. Brekhovskikh, Waves in Layered Media (Academic Press, New York, 1980), pp. 234-241.

Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 39
No :4
Pages :227-236
Received Date : 2020-04-08
Accepted Date : 2020-05-21
DOI :https://doi.org/10.7776/ASK.2020.39.4.227

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

All Issue