2 点吊り振子と小振子の連成振動の制振評価:静岡県の「プロジェクトTOUKAI (東海・倒壊)-0 (ゼロ)」による教材の開発(3)

概要

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A uniform density bar is suspended at its two ends by two strings whose two end points are attached to an upper staticwall. The bar may swing or make torsional oscillation in a vertical plane from its equilibrium rest state, which is called bifilarsuspension pendulum. When the distance between the two points is longer or shorter than the bar length, the bar attitude maychange during swinging of the bar. When it is just the same, the bar swings with keeping the attitude horizontal. Taking intoaccount this particular property of the pendulum and the attachment of small pendulums as tuned mass dampers, some devicesfor seismic mitigation may be proposed to give rise to stable oscillation or unstable growing in time. Based upon the fixed pointtheory, we may evaluate the pendulum system to suppress effectively the response to the external excitation.
2010-01-31