The Effects of Particle Properties on the Parameters of Impact Sound between Two Particles [Translated]<sup>†</sup>

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The parameters of impact sound between two particles are discussed to measure the particle size and velocity of colliding particles by the analysis of that impact sound. The radiation mechanism of the impact sound is considered theoretically, and the pressure waveform of the sound is estimated on the basis of the radiation mechanism. The calculation of pressure waveform takes account of the reflection of the impact sound from the surface of the colliding spherical particle. The estimated waveform agrees well with the measured one. <br>The parameters of impact sound related closely to the particle size and impact velocity between particles. <br>The results show that it is possible to measure the particle size and velocity of flowing particles by the analysis of flow noise.<br><br>† This report was originally printed in J. Soc. Powder Technology, Japan. 24(10), 655-663 (1987) in Japanese, before being translated into English by KONA Editorial Committee with the permission of the editorial committee of the Soc. Powder Technology, Japan.

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