Effective control of structure under the excitation due to nonstationary natural wind force

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(1)Nonstationary, wind-induced response of a circular cylindrical tower.A wind tunnel experiment using a SDOF circular cylinder tower model was conducted to study the characteristics of the across-wind vibration. Included in this study are effects of turbulence in the flow and the critical damping ratio. Special attention is paid to the vortex-induced vibration which occurs at a wind speed higher than that of the ordinary vortex-induced vibration. Across-wind model response and the fluctuating wind velocity behind the tower at various heights were measured. Wavelet analysis was applied to the fluctuating wind velocity data behind the model. The wavelet analysis clarified that the tip-associated vortex is formed rather intermittently around the tower top and this causes the across-wind vortex-induced vibration at a high wind speed.The amplitude of the vortex-induced vibration at a high wind speed possesses a slight modulation due to the intermission of the tip-associated vortex.The research also studied(2)Nonstationary analysis of natural wind(3)Modelling TLD(4)Effective control of structure under nonstationary excitation