2 点吊り振子の3 つの線形振動mode の実験と解析

概要

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A bifilar suspension pendulum, a uniform density bar suspended at its two ends by two strings of same length,may swing in a vertical plane or rotate about a vertical axis. The period and pattern of swinging depend upon the ratios ofthe bar length and of the distance of the supporting points to the distance between two end points of the strings attached toan upper wall. The swinging in a co-plane of the strings and the bar is called Mode 1, and the swinging in a vertical planeperpendicular to the bar is Mode 2. Mode 3 is the torsional oscillation about a vertical axis. In view of these modes ofbifilar suspension pendulum, we propose here an education device to measure two swinging modes and one torsional mode.As its feasibility study, the oscillation experiments are made to compare the theoretical period. The results are evaluatedwell and then further improvements are suggested.
2011-01-31