This paper deals with the quenching problem of vortex-induced vibrations by using devices composed of Hula-Hoops and generators. These devices are also able to generate electricity. The experiment was made concerning the quenching problem of the vortex-induced vibrations of towering structures with the devices. Moreover, a numerical analysis was also carried Out using the Runge-Kutta-Gill method. An optimum approach for quenching the vortex-induced vibrations of low and high flexural rigidity directions are discussed. As a result, the following was made clear: (1) The vortex-induced vibrations of both flexural rigidity directions were well quenched for a wide range of wind velocities and the different wind directions by using four devices simultaneously. (2) The optimally quenched vibration was a chaos of intermittency. (3) A condition of maximum power generation was not equal to that of the optimum vibration quenching of the main system. (4) The experimental and the analytical results were in good qualitative agreement with each other. (C) 2003 Elsevier Ltd. All rights reserved.
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