空気抵抗を考慮した板の自由落下と振動性状

概要

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The purpose of this study is to explain the influence of air resistance against a board when in free fall, free vibration, and stationary vibration through experimental studies in which the parameters are the presences or absences of air resistance and a gap between the board and a wall. The board is a substitution of a hanging ceiling here. The influence of air resistance is clarified by an attenuation coefficient obtained when in free fall and free vibration, and by an acceleration occurred in a hang bolt. From the experiments and numerical analyses, the followings are clarified: (i) when in free fall, the influence of the force of inertia is larger, sensitivities of initial condition are not small, and the force of inertia is in inverse proportion to the square of the gap length (ii) when in free vibration, the air resistance is working as the force of inertia, and the influence of the force becomes large when the gap is less and equal to 5cm. (iii) when in stationary vibration, the air resistance becomes large when the frequency or the amplitude becomes large. The high acceleration in which the bolt may buckle lets the ceiling float and slide, And the gap length of 5cm or more does not generate air resistance.
一般社団法人日本建築学会の論文
2010-03-27