THE JOURNAL OF THE ACOUSTICAL SOCIETY OF JAPAN
Online ISSN : 2432-2040
Print ISSN : 0369-4232
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Volume 18, Issue 3
Displaying 1-8 of 8 articles from this issue
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  • Design of Exhaust Gas Muffler for Marine Diesel Engine
    Kanji Uraki, Masaichi Moriuchi
    Article type: Article
    1962 Volume 18 Issue 3 Pages 109-117
    Published: May 30, 1962
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.18.3_109
    JOURNAL FREE ACCESS
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    In order to cope with the recent speeding-up of seagoing vessels, high powered engines are being installed, and among those, the diesel engines are commonly used from the economy standpoint of fuel consumption. The exhaust gas noise of the larger diesel engines are in the low frequency range, and since its sound level is pretty high, the cabines in the neighbourhood of the funnel are affected by this characteristic low frequency sound. Together with the actual analysis of the exhaust gas noise, model test of a muffler with a consideration of back pressure charactaristics was conducted, and a muffler with internal pipes was made as the result of this test as reported in this paper. In case of a low-pass filter type muffler, the cut-off frequency has to be reduced below the fundamental frequency of the exhaust gas noise which world result the length of expansion chamber becoming too long for installation in limited space of a vessel, so a muffler of combined exhaust gas boiler type is being considered at present.
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  • Distortion in Stereo Disc Record(II)
    Takeo Siga
    Article type: Article
    1962 Volume 18 Issue 3 Pages 118-131
    Published: May 30, 1962
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.18.3_118
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    In such case as the force acting on the groove-walls is circulary antisymmetrical, the deformation of a well is affected not only by the modulation of itself but also by the modulation of another wall, because the force acting on a wall also varies in accordance with the modulation of another wall. In general, F_1=F_1(q_1, q_2, S_1(t), S_2(t)) F_2=F_2(q_1, q_2, S_1(t), S_2(t)) where F is the force acting on the wall, S(t) is the displacement of stylus and q is the modulation of the wall. Then both S_1(t) and S_2(t) are function of q_1 and q_2. On account of this effect, both new harmonic distortions and cross-talk of fundamental are developed, and the latter changes the ratio of output voltage and phase shift between the right and the left channel. As examples of this; 1)Effect of pick-up-compliance which is not equal with respect to vertical and lateral direction, 2)Effect of pick-up-arm which is not infinit length, 3)Effect of tracking error, 4)Effect of the cutting wegde angle which is not 90℃ are caluculated and discussed. Experimental measurements under extreme conditions confirm with the theoretical caluculations. As the result, it is concluded that these effects are not too large as far as well designed pick-up and conventional vynilite record are used.
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  • A Method for Measurement of Hydrophone Response in the Circular Water Tank
    Hideo Takemura, hisashi Miyazawa
    Article type: Article
    1962 Volume 18 Issue 3 Pages 132-139
    Published: May 30, 1962
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.18.3_132
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    Measurements of hydrohone response over audio-frequency range are usually performed in the sea where the acoustic free field is realized. But, such measurements are not convenient for occasional tests of many hydrophones. We have tried the measurement of hydrophne response in the reverberant field using white noise source in a circular water tank concrete wall. In this tank, the acoustic presure distribution was measured in details when a sound source generating 1/3 octave band noise was placed in the neighbourhood of the tank wall. It was proved as the result of measuerments that an approximately uniform sound pressure distribution exixts near the central portion of the tank in the frequency range above 500c/s. In this field, hydrophone response was measuered with calibration technique based on comparison method. The response obtained by this method is in good agreement with the one obtained by the free field method in the sea.
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  • [title in Japanese]
    Article type: Article
    1962 Volume 18 Issue 3 Pages 140-142
    Published: May 30, 1962
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.18.3_140
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1962 Volume 18 Issue 3 Pages 143-146
    Published: May 30, 1962
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.18.3_143
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    Article type: Article
    1962 Volume 18 Issue 3 Pages 147-148
    Published: May 30, 1962
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.18.3_147
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    Article type: Article
    1962 Volume 18 Issue 3 Pages 148-165
    Published: May 30, 1962
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.18.3_148
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    Article type: Article
    1962 Volume 18 Issue 3 Pages 165-168
    Published: May 30, 1962
    Released on J-STAGE: June 02, 2017
    DOIhttps://doi.org/10.20697/jasj.18.3_165
    JOURNAL FREE ACCESS
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