Generation of subharmonic and difference frequency acoustic waves in a water-saturated sandy sediment

Title
Generation of subharmonic and difference frequency acoustic waves in a water-saturated sandy sediment
Author(s)
김병남; 이강일; 윤석왕; 최복경
KIOST Author(s)
Choi, Bok Kyoung(최복경)
Publication Year
2004-05-27
Abstract
Generation of subharmonic and difference frequency acoustic waves in a water-saturated sandy sediment was investigated. Subharmonic frequency acoustic wave was observed to be generated due to the nonlinearity of water-saturated sandy sediment when the fundamental frequency acoustic wave exceeded a certain threshold pressure amplitude. Pressure spectrum level of the subharmonic frequency acoustic wave linearly increased as the driving acoustic pressure amplitude increased. The pressure level was 10 dB higher than the background noise level. Generation of the difference frequency acoustic wave was also observed by the collinear acoustic waves with two different fundamental frequencies. The pressure level of the difference frequency acoustic wave was 5 dB higher than the background noise level. It seems very useful to evaluate the nonlinear parameter of water-saturated sandy sediment without disturbing the sediment. Such nonlinear acoustic responses of water-saturated sandy sediment can be utilized for the diagnosis of marine gassy sandy sediment.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/31847
Bibliographic Citation
2004 미국음향학 학술발표대회(J. Acoust. Soc. Am.), pp.2625, 2004
Publisher
미국음향학회
Type
Conference
Language
English
Publisher
미국음향학회
Related Researcher
Research Interests

Underwater Acoustics,Bubble Acoustics,Marine Defense & Safety,수중음향,기포음향,해양방위·안전

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