| In this paper, a wind tunnel test is carried out on the aeroelastic model for a500kVtransmission tower, in which the non-contact precision measurement technology is applied tomeasure the displacement. The research work of this paper is mainly focused on the followingaspects:1. The non-contact precision measurement technology is applied to the dynamicdisplacement measurement of transmission tower. Base on this technology, the follow-upstudies are carried out.2. The ANSYS software is applied to the design of the aeroelastic model and a methodof simulating shape and rigidity simultaneously is applied to the formation of the experimentmodel. Also, the model frequency and vibration model are identified.3. The dynamic responses of the model in turbulence flow are measured for a widerange of wind velocity and wind attack angle. The mean and RMS of responses in along winddirection and across wind direction are calculated, and the rules by which they vary with windvelocity and wind direction angle are got. Also, the wind-induced vibration coefficient iscalculated and the analysis conclusions can be used for reference to practical engineering. Avibration coefficient correction factor for damping and mode is defined and the vibrationcoefficient after being modified is presented in this paper.4. Through the combination of RDT method and hilbert transform, this article realizestotal damping identification of the aeroelastic model in turbulent wind field and it do notappear negative aerodynamic damping value in test wind speed.5. Standard method to determine equivalent wind load is proposed. The results showthat the peak displacement responses determined by the ESWL approach are in agreementwith those from the wind tunnel test. The center track of the tower top got by the wind tunneltest illustrates the rationality of the ESWL. In addition, the comparison of mean andbackground wind loads between high frequency force balance result and ESWL, show the effectiveness of the proposed methodology. |
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