2 点吊り振子と小振子の連成運動の基礎解析

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 on the wall is longer or shorter than the bar length, the barattitude may change during swinging of the bar. When it is just the same, the bar swings with keeping the attitude horizontal.These features are important in the design of seismic mitigation. When small pendulums are attached to the bar, those may workto suppress the oscillation of the whole system. This idea is examined in the present paper using a linear theory. It is found that other oscillation modes can be found due to small pendulums, and the response may be suppressed.
2010-01-31