著者
奥平 有三 安藤 秀行 佐藤 宗武 宮南 啓
出版者
The Society of Powder Technology, Japan
雑誌
粉体工学会誌 (ISSN:03866157)
巻号頁・発行日
vol.32, no.5, pp.311-318, 1995-05-10 (Released:2010-04-30)
参考文献数
16
被引用文献数
1 2

The sound absorption coefficients and sound velocity of various powder beds were measured in the frequency range of 200Hz to 2kHz. The powder beds were comprised of classified powders having mean particle diameters from 53 to 300μm. For the powder beds consisting of smaller particles, the sound absorption coefficients showed distinct peaks due to the excitation of normal vibration modes of the powder bed. In the frequency range in which sound absorption peaks appear, the sound velocity has almost on frequency dependency, and sound energy is dissipated mainly by the interaction of vibrated particles. As particles with larger diameters were used, these peaks decreased in amplitude, but the level of sound absorption increased in the high frequency range. In this frequency range, sound velocity increases according to frequency, and sound energy is dissipated mostly by the viscosity of the air in the pores.

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ヘリウムガスで音が高くなる理由って音速の違いなんだ、初めて知った。固体とかはとても音速が速いけど砂とかはどうなのかなと思ったら逆に小さくなるみたい。 >>音速の値は各 試 料とも約30 m/sと空気中の音速や,固体中を伝わる弾性波の速度と比べて非常に小さい https://t.co/biUORloh1p

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