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Identification of aerodynamic derivatives of self-excited forces on ice-covered suspension cables in tension cable-supported power transmission structures
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AI
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王
Z
DOI：10.1016/j.jweia.2026.106588.png)
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Abstract
En 中文
The tension cable-supported power transmission structure (TC-PTS) represents an innovative overhead transmission system specifically developed for mountainous terrain, yet it exhibits pronounced sensitivity to wind loads following ice accretion. Ice accretion transforms suspension cables from nearly circular sections into aerodynamically asymmetric bluff bodies, thereby altering their motion-induced unsteady aerodynamic forces in turbulent mountainous winds. This study identifies the aerodynamic derivatives of self-excited forces on ice-covered suspension cables in TC-PTS and examines the influence of grid-generated turbulence on these derivatives. Forced-vibration wind tunnel tests were carried out on D-shaped and fan-shaped ice-covered sectional models under uniform flow and two grid-generated turbulent flows with different turbulence intensities and integral scales. The aerodynamic derivatives associated with vertical and torsional motions were identified using a time-domain self-excited force formulation. The results show that incoming turbulence mainly changes the magnitude, rather than the overall variation trend, of most aerodynamic derivatives with reduced velocity. The D-shaped section is more sensitive to turbulence than the fan-shaped section, indicating that severe ice-induced geometric distortion increases the susceptibility of motion-induced aerodynamic forces to inflow fluctuations. The turbulence-induced changes in damping- and stiffness-related derivatives further suggest that the wind-induced stability of ice-covered suspension cables cannot be assessed reliably using quasi-steady assumptions alone. The findings provide experimental evidence for the unsteady aerodynamic behavior of ice-covered non-circular cables and support improved wind-resistant design of TC-PTS in mountainous regions.
Keywords:
Tension cable-supported power transmission structure
Ice-covered suspension cable
Grid-generated turbulence
Aerodynamic derivatives
Self-excited forces
Forced-vibration wind tunnel test
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