209 動吸振器を用いたギャロッピング現象の抑制対策(振動低減・振動制御,OS-1 振動基礎,総合テーマ「伝統を,未来へ!」)

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This paper deals experimentally and analytically with the design of a dynamic absorber to quench galloping phenomena generated in transmission lines in the condition of storong wind. Galloping phenomena are one of self-excited vibration called flow-induced vibration, and it is caused by a hydrodynamic coefficient obtained from lift force and drag having a negative damping. As a countermeasure, a dynamic absorber was experimentally applied to a simple experimental test rig composed of the main system supported by four springs. And, the simple analytical model of galloping was set up. The dynamic absorber was applied also analytically. It was found by the experiments and analysis that the natural frequency of the dynamic absorber should be tuned near the galloping frequency and the optimum damping of the dynamic absorber exists to quench the galloping. These results qualitatively agreed with experimentally and analytically.
2010-09-14