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

Zhaoqing Chen, Weijie Cai, Jin Su, Bo Nan (), Cong Zeng and Ning Su
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Zhaoqing Chen: School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin City 132012, China
Weijie Cai: School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin City 132012, China
Jin Su: School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin City 132012, China
Bo Nan: College of Water Conservancy, Shenyang Agricultural University, 120 Dongling Road, Shenyang 110866, China
Cong Zeng: School of Civil Engineering and Architecture, Northeast Electric Power University, Jilin City 132012, China
Ning Su: Tianjin Research Institute for Water Transport Engineering, Ministry of Transport, Tianjin 300456, China

Sustainability, 2022, vol. 14, issue 24, 1-24

Abstract: 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.

Keywords: ice-coated transmission line; galloping; aero-elastic model; wind tunnel test; oblique flows; aerodynamic coefficients (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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