Impact Sound due to an Elastic-plastic Collision between a Ram and Billet

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概要

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• In this paper, the pressre wave form of the impact sound, which is radiated from the end surfaces of a ram in the deformation process of a billet, is discussed theoretically and experimentally. The impact sound may be attributed to air pulses caused by a sudden acceleration of the ram. The impact sound wave at a field point is calculated by superimposing those emitted from the divided small elementary areas of the end surfaces. In the calculation, it is assumed that the acceleration of the ram consists of a half-sine pulse, and that the shelter effect due to the ram can be ignored when the wave of the impact sound is longer than the ram. The superimposed sound pressure wave forms agree fairly well with those measured in the laboratory experiment, and show fairly well the change of wave forms due to different points.

• 一般社団法人日本機械学会の論文

著者

• NISHIDA Kohshi

  Muroran Institute of Technology

• Yoshii Toshiaki

  The Hokkaido Electric Power Co. Inc.

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