2 点吊り振子の基礎運動解析

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, some device for seismic mitigation has been proposed. In this connection, wemake analysis from linear to nonlinear stage of various modes of oscillations, and some exact mechanical equations are derivedfor free swinging mode. Fundamental results are discussed here and some of them will be solved in the following papers.
2010-01-31