The Journal of the Marine Acoustics Society of Japan
Online ISSN : 1881-6819
Print ISSN : 0916-5835
ISSN-L : 0916-5835
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Volume 19, Issue 1
Displaying 1-2 of 2 articles from this issue
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  • Investigation of parametric amplification mechanism by computer simulation-(Part 2)
    Including linear absorption.
    Akira NAKAMURA
    1992 Volume 19 Issue 1 Pages 31-37
    Published: January 01, 1992
    Released on J-STAGE: August 16, 2011
    DOIhttps://doi.org/10.3135/jmasj.19.31
    JOURNAL FREE ACCESS
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    Parametric amplification mechanism of sound is described by using computer simulation including absorption due to medium. Secondary wave with difference frequency is parametrically generated by distortion of envelop caused by finite amplitude effect of carrier which is composed of two different frequencies. In this case, shock formation at larger amplitude periods in amplitude modulated carrier is prevented by the absorption. Therefore, the difference-frequency generation is continued by desired distortion of envelop, even if propagation distance is over the shock formation distance. It is concluded that conversion efficiency from carrier energy to energy of the secondary wave with the difference frequency is improved by absorption and undesired distortion of the secondary wave is suppressed at the same time.
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  • A study for measurement of flow-induced noise
    Application of accelerometer.
    Kazumi TAKADA, Seiji NAKANO, Hironobu HASE, Minehiro KATAYAMA, Mutsuo ...
    1992 Volume 19 Issue 1 Pages 38-42
    Published: January 01, 1992
    Released on J-STAGE: March 02, 2011
    DOIhttps://doi.org/10.3135/jmasj.19.38
    JOURNAL FREE ACCESS
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