【摘要】 结合±800 kV特高压直流输电线路气弹模型的风洞试验,利用经验模态法、随机减量法及H ilbert变换法识别环境激励下气弹模型的结构参数.研究输电单塔及塔线体系在不同风速下气动阻尼及固有频率的变化特性.结果表明:在环境激励下,结构频率有随风速减小的趋势,而气动阻尼比有明显增加,特别是塔线体系较单塔更为显著;塔线体系的频率及阻尼比较单塔均有提高,阻尼比提高较为明显,随着风速的增加,气动阻尼变化明显,气动阻尼对风振响应的影响应引起重视.更多还原

【Abstract】 On the aeroelastic model tunnel test of ±800 kV UHV DC transmission lines,the structural parameters of the aeroelastic model under the ambient excitation with the empirical mode decomposition(EMD),random decrement technique(RDT) and Hilbert transform are identified.The characteristics of the aerodynamic damping and natural frequency of the transmission tower and transmission line system under the different wind speed are studied.It is found that the effect of aerodynamic damping to the wind-induced vibration in the case of transmission line system cannot be ignored.更多还原