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Author Kamakura, Tomoo ♦ Hasegawa, Manabu ♦ Kumamoto, Yoshiro
Source J-STAGE
Content type Text
Publisher Acoustical Society of Japan
Language English
Abstract Parabolic approximation is effectively used to analyze the nonlinear acoustic field generated by a directive sound source in layered media. Quasi-linear approach and linear boundary condition are applied to obtain the fundamental and second harmonic waves transmitting through a plane interface that separates two media. The interface is placed in nearfield for the harmonic. The spectral contents of sound pressure are measured and compared with the theoretical prediction. Both the results are in good agreement for propagation curves and beam patterns. Transmission loss by insertion of a thick layer across an acoustic beam is also investigated. It is shown that unlike the fundamental wave loss the harmonic loss varies with source-layer distance. All experiments are conducted in water, methanol and castor oil.
ISSN 03882861
Learning Resource Type Article
Publisher Date 1988-01-01
e-ISSN 21853509
Journal Journal of the Acoustical Society of Japan (E)(ast1980)
Volume Number 9
Issue Number 2
Page Count 8
Starting Page 89
Ending Page 96


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