粒状体の流動における音の発生機構

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タイトル別名
  • Genetrating mechanism of sound in shear flow of granular materials.
  • リュウジョウタイ ノ リュウドウ ニ オケル オト ノ ハッセイ キコウ

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The generating mechanism of sound in shear flow of a granular material was studied by applying powder mechanics and acoustic theory. In shear flow, rupture layers are formed periodically in the granular bed. The sound field generated by the formation of rupture layers was estimated on the basis of the model of sound radiation from a piston in an infinite wall. The sound pressure waveform agrees well with the measured one. This result shows that the sound parameters closely relate to the frictional properties and the formation of rupture layers.

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