Transmission towers with steel tubes or so-called tubular towers are widely used for ultra-high voltage (UHV) transmission because of their overall higher strength and stability, and better wind resistant capability. However, within a specific wind velocity range, tubular members with a high slenderness ratio are susceptible to joint fatigue failure under the vortex-induced vibration (VIV). To thoroughly unveil the mechanism of VIV of tubular members in UHV transmission towers, this paper first measures the acceleration and corresponding wind velocity of a tubular member under the VIV, followed by an identification of the first-order frequency. Then, a simulation framework for the tubular members subjected to the VIV is proposed. The system considered is simplified as a mass–spring–damping system with the non-linear coupling effect between the tubular member and wind field taken into account. Based on the analysis, the lock-in region and maximum displacement amplitudes in the cross-wind direction are calculated, while the simulation accuracy is verified via comparison with the on-site measured data. Meanwhile, the influence of damping ratio on the VIV is studied. Finally, a new type of radial spoiler is proposed to suppress the VIV of the tubular members. The results of the 3D simulation show that the proposed radial spoiler can effectively suppress the vortex generation, and there is no noticeable vibration after the installation of the countermeasure. In effect, it was demonstrated that the proposed countermeasure can effectively suppress the VIV of the tubular tower. The parametric analysis reveals that the distance between two adjacent spoilers has a significant impact on the control efficiency and should be carefully designed for each project.

中文翻译：

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管状输电塔涡激振动及对策

钢管输电塔或所谓的管状铁塔因其整体更高的强度和稳定性以及更好的抗风能力而被广泛用于超高压（UHV）输电。然而，在特定风速范围内，长细比高的管状构件在涡激振动（VIV）作用下容易发生关节疲劳破坏。为彻底揭示特高压输电铁塔管状构件VIV的机理，本文首先测量了VIV下管状构件的加速度和相应的风速，然后确定了一次频率。然后，提出了一种受VIV影响的管状构件的仿真框架。考虑的系统被简化为质量-弹簧-阻尼系统，其中考虑了管状构件和风场之间的非线性耦合效应。在分析的基础上，计算了侧风方向的锁定区域和最大位移幅值，并通过与现场实测数据的对比验证了仿真的准确性。同时研究了阻尼比对VIV的影响。最后，提出了一种新型径向扰流板来抑制管状构件的VIV。3D仿真结果表明，所提出的径向扰流板能够有效抑制涡流的产生，并且在安装对抗装置后没有明显的振动。实际上，证明了所提出的对策可以有效地抑制管状塔的VIV。