2 点吊り振子と小振子の連成運動の実験と線形運動解析

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. When small pendulums areattached to the bar, those may work to suppress the oscillation of the whole system. To examine this idea, experiment dataand the response by a linear theory are compared in the present paper. It is found that the resonant frequency is very closeto the expected and the response may be suppressed. These typical results may be applied for the mitigation in EarthquakeEngineering and Seismic Design.
2011-01-31