| 超大型冷却塔随机风振响应分析 |
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| 引用本文： | 许林汕,赵林,葛耀君.超大型冷却塔随机风振响应分析[J].振动与冲击,2009,28(4):180. |
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| 作者姓名： | 许林汕 赵林 葛耀君 |
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| 作者单位： | (同济大学土木工程防灾国家重点实验室,上海 200092) |
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| 摘 要： | 冷却塔在随机风荷载激励作用下,动力响应具有小变形、弱非线性特点,固有频率在低频段密集分布,模态之间耦合效应较为明显.基于冷却塔刚体模型表面同步测压风洞试验结果,以非定常气动力作为输入荷载,考虑冷却塔多模态之间耦合效应,利用虚拟激励法和振型迭加法进行结构随机风振响应分析.定量地比较了结构风振响应中背景分量和共振分量的贡献,研究了参振模态数目、力谱交叉项和结构阻尼比等参数的作用效果,并与冷却塔气弹模型测振风洞试验结果进行了比较.
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| 关 键 词： | 超大型冷却塔 随机风振响应 虚拟激励法 参数分析 风洞试验 |
Wind-excited stochastic responses of super large cooling towers |
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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. |
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| Authors: | XU Lin-shan ZHAO Lin GE Yao-jun |
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| Affiliation: | (State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University,Shanghai 200092, China) |
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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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| Keywords: | super large cooling tower stochastic wind-excited responses pseudo-excitation method parameter analysis wind tunnel test |
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