2 点吊り振子の線形運動解析

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, mayswing in a vertical plane. The period and pattern of swinging depend upon the ratio of the bar length to the distance between twoend points of the strings attached to an upper wall. When a body is put on the center of the bar, the system may become unstableor stable (in oscillation), which is specified by the height of the mass center of the body from the bar and the ratio. When theratio is unity, the system is always stable. The most typical feature is clarified in more detail by extending the proceeding work.It also turns out that the most unstable configuration may arise when the height and the ratio are both small. These typicalresults may be applied for the mitigation in Earthquake Engineering and Seismic Design.
2010-01-31