コイルばねの縦衝撃

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タイトル別名
  • The Longitudinal Impact of Coil Springs
  • コイルバネ ノ タテ ショウゲキ

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抄録

The impact problems of an elastic body treated by Saint Venant, Bousinessq and Donnel are only about the transient state in the shocked surface of the body. Pipes transformed a shocked system into the equivalent electric circuit and solved it with the operative method. In this paper the authors introduce Dirac's δ(t)-function into the boundary condition in the parallel system of a coil spring and a damper, and solved it with the method of Laplace transformation. The results are summarized as follows : (1) The condition that a falling body separates from a spring after impact is obtained. (2) The maximum stress of the fixed end of a spring and the approximate equation for it are found. (3) The effects of a damping coefficient on the restitution coefficient are made clear. (4) The spring stress due to impact decreases as a damping coefficient increases, and the transmission force at the fixed end of the spring takes the minimum value when a damping coefficient is optimum.

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