Wind induced vibration response analysis and vibration reduction optimization design of a frame lightning rod based on bidirectional fluid structure coupling
ZHAO Guifeng,CAO Pengyi,SHI Yuhao,ZHANG Meng,LIU Ran
School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
Abstract:Taking the lightning rod structure of a 500 kV high-voltage substation as an example, the finite element model is established to do the lightning rod wind-induced vibration response analysis. The wind-induced vibration response of the lightning rod is simulated and analyzed by the two-way fluid structure coupling method, and the vibration reduction optimization design of the lightning rod is carried out by using the method of attaching spiral guide plate. The results show that: due to the thin and flexible superstructure characteristics, the wind-induced vibration response of the lightning rod with round steel tube frame is more prominent in the along-wind direction and across-wind direction, especially the across-wind direction vibration response even occupies the dominant position in some conditions. For the frame lightning rod analyzed in this paper, when the wind speed is 12.64m/s ~ 25.30m/s, the across-wind direction vortex induced vibration "lock-in" phenomenon will occur, and its maximum resonance response (wind speed of 18.97m/s) even exceeds the along-wind direction response value of the structure under the design basic wind speed (23.83m/s). In the actual design, the spiral guide plate with pitch of 8D and coverage rate of 30% can be attached to the top of the frame lightning rod to control its across-wind direction vortex induced vibration effectively.
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