機械の衝突音の研究 : 第2報,音圧波形の形成過程

概要

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The dynamic response of a plate and the impact noise are considered experimentally and analytically, when a steel sphere strikes a polymethyl methacrylate circular plate. The experimental results are compared with the calculated results, and the formative process of the sound pressure is studied by the calculation. At the initial stage of the impact noise measured on the central axis of the plate, the initial peak and the plateau are observed, and afterward the sound pressure attains the maximum value. The calculated results agreed with the characteristics of these results. By calculation it is found that the formation of the plateau at the initial stage is based on the response of the acceleration in the central area, r/a<le>0.6 of the plate, and the formation of the positive maximum sound pressure is based on the response of the acceleration in the lap area, r/a<le>0.7 of the plate. The wave form of the impact noise outside the central axis of the plate becomes simpler by decreasing the higher modes.
一般社団法人日本機械学会の論文
1986-11-25