749 複数のフラフープを用いた塔状構造物の渦励振の制振と発電(自励振動)(OS.13 : 非線形現象の解明と応用)

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This paper deals with the quenching problem of vortex-induced vibrations by using devices composed of Hula-Hoops and generators. These devices are also additionally able to generate electricity. The experiment was made on the quenching problem of the vortex-induced vibrations of the towering structures with the devices. Moreover, the numerical analysis was also carried out by using the Runge-Kutta-Gill method. An optimum approach for quenching the vortex-induced vibrations of low and high flexural rigidity directions were discussed. As a result, the followings were made clear. (1) The vortex-induced vibrations of both flexural rigidity directions were well quenched for the wide range of wind velocity and for the different wind directions by using four devices simultaneously. (2) The optimally quenched vibration was chaos. (3) The condition of maximum generation of electricity was not equal to that of minimum vibration amplitude of the main system. (4) The optimal design method of Hula-Hoops reported in previous paper was useful for this quenching problem. (5) The experimental and the analytical results were in good qualitative agreement with each other.
2001-08-03