Eccentricity-induced galloping mechanism of a vertical-torsional coupled 3-DOF system

Wen, Zhenzhen; Xu, Hengyu; Lou, Wenjuan

doi:10.1016/j.jweia.2022.105174

Cited by 10 publications

(1 citation statement)

References 35 publications

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“…For example, Guo et al [12,13] proposed an experimental method to study the galloping characteristics of an ice-coated four-split conductor. Lou et al [14][15][16] tested the aerodynamic coefficients of eight-split conductors and proposed a galloping stability criterion for the 3-DOF coupled motion of an ice-accreted conductor. Xie et al [17] tested the global drag coefficients of multi-split transmission lines with different diameters and split numbers, which were subjected to different turbulence intensities and wind attack angles.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Force and Aeroelastic Response Characteristics Analyses for the Galloping of Ice-Covered Four-Split Transmission Lines in Oblique Flows

Chen

Cai

et al. 2022

Sustainability

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In order to study the galloping mechanism of ice-covered four-split transmission lines in oblique flows, the aerodynamic forces and aero-elastic response characteristics of the crescent-shaped four-split ice-covered transmission lines are investigated through wind tunnel tests on rigid and aero-elastic models. According to Den Hartog and Nigel’s galloping theories, the damping coefficients are calculated based on the experimental data. The results show that the crescent-shaped ice-covered four-split transmission lines usually suffer from torsional galloping. Furthermore, based on the aero-elastic wind tunnel data, the galloping is characterized by an elliptical trajectory, negative damping ratio, and a negative strain at hanging position. In addition, the galloping appears to be more prone to occur under oblique flows, with a larger galloping amplitude and a lower critical wind speed. This might be because an out-of-plane vibration of the third-order mode is excited at a lower wind speed, leading to a coupled resonance between in-plane and out-of-plane vibrations at the third-order mode with a frequency ratio of 1:1. The experimental results in this paper can also be used to verify the fluid-structure interaction simulation method of ice-covered transmission lines.

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