Two-Degrees-of-Freedom CFD Simulation of Aeolian Wind Energy Input to Conductors and Integrated Anti-Vibration Solutions

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Aeolian vibrations of overhead transmission conductors under light wind excitation can cause fatigue damage at line clamps, threatening grid safety. Accurately evaluating wind energy input is key for assessing vibration intensity and designing anti-vibration devices. This paper employs CFD overlapping mesh technology to establish a two-degrees-of-freedom fluid–structure interaction model of the conductor. Through numerical simulations at different Reynolds numbers, a cubic polynomial relationship between wind energy input power and amplitude ratio is derived, and a wind turbulence intensity correction factor is introduced. Using a long-span conductor as a case study, the fitted wind energy input is substituted into the energy balance equation to calculate dynamic bending strain under four conditions: no control, only vibration dampers, only damping wires, and a combined scheme. The results show that using either vibration dampers or damping wires alone cannot reduce dynamic bending strain below 200 με, while the combined scheme reduces the maximum strain within the critical frequency range to 113.09 με. This verifies the effectiveness of the fitted wind energy input formula in engineering anti-vibration design.