振動体の自由減衰振動に及ぼす空気の影響

概要

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Among various vibration damping causes, the one which may be utilized for layout of damping property, necessary for dynamic earthquake-proof construction is resistance of the air. In this study, a vibration body (model) is given vibration, wherein the projection surface of vibration direction (A_n) is only changeable while height (h), specific period (T_o), weight (W), initial amplitude (A_o) and vibration curve there of are constant inside vacuum and atmospheric air of both spaces and the amplitude envelope of free damping vibration is aralized and it is found, upon investigation, that influence exercised on vibration damping of the present air resistance is the greater when W/A is the smaller. At around W/A=0.3 gr/cm^2, Amplitude ratio=[numerical formula] when W/A=0.0026 gr/cm^2, it becomes around 24.
社団法人日本建築学会の論文
1971-07-30