Wind-excited stochastic responses of super large cooling towers

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Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (4) : 180-184,.

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Wind-excited stochastic responses of super large cooling towers

XU Lin-shan, ZHAO Lin, GE Yao-jun

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Abstract

Under action of stochastic wind loading, dynamic responses of a cooling tower show small deformation and weakly nonlinear characteristics. Its natural frequencies centralize in a lower frequency band, coupling effects between various modes are obvious. With help of syrface aerodynamic pressure of a 1B200 reduced-scale cooling tower model which was measured in TJ-3wind tunnel,the stochastic response ofa full scale cooling tower was calculated using pseudo-excitation method and super position method, considering the coupling effects between modes. The contributions of background components and resonantones were quantified and the effects of different parameters, such as, modal numbers,cross terms of force spectra, damping ratio etc, were systematically studied.The numerical calculation results were in good agreement with the dynamic responses measured on the 1B200 reduced-scale cooling tower aeroelastic model.

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super large cooling tower / stochastic wind-excited responses / pseudo-excitation method / parameter analysis / wind tunnel test

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XU Lin-shan;ZHAO Lin;GE Yao-jun. Wind-excited stochastic responses of super large cooling towers[J]. Journal of Vibration and Shock, 2009, 28(4): 180-184,