機械の衝突音の研究 : 第1報,円板から発生する衝突音

概要

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The problem of the impact noise of machines is investigated experimentally and analytically. A sphere is struck at the center of a circular plate, and the displacement of the plate, the sound pressure radiated from the plate, and the directivity were measured. The impact noise is composed of three stages, that is, the initial stage, which shows sometimes the initial peak, the transient stage, and the free-vibration noise stage. At the early stage of the impact noise, the measured impact noise agreed well with the calculated results. The directivity of the first mode of the impact noise was not observed, but the directivity of the higher mode was observed. From the directivity of the maximum value of the impact noise, it was found that the radiated sound pressure are concentrated within the cone with about 65 degree of the conical half angle, whose apex is located in the center of the plate.
一般社団法人日本機械学会の論文
1985-07-25