1.College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;
2.Huadong Engineering Corporation Limited, Hangzhou 311122, China;
3.School of Civil Engineering, Central South University, Changsha410075, China
Abstract：The large-span photovoltaic support structure is light and flexible, and is vulnerable to wind-induced aeroelastic effects. In order to study the aerodynamic damping characteristics of this structure, an aeroelastic model wind tunnel test was carried out to a typical large-span flexible photovoltaic support structure with module inclination of 0° and 10° under different wind speeds and pretensions. Based on the aeroelastic test results, empirical wavelet transform (EWT) and variational modal decomposition (VMD) combined with the improved random reduction method (RDT) were used to identify the aerodynamic damping ratio of photovoltaic structure under different wind speeds and directions, module inclinations, and cable pretensions. The study results show that the aerodynamic damping ratio is sensitive to the change of wind direction angle. When the module has an inclination of 10°, the aerodynamic damping of a large-span photovoltaic structure shows a negative value under the windward wind azimuth of 180°. Increase of pretension may lead to decrease of aerodynamic damping ratio of a horizontally installed module under a high wind speed. The aerodynamic damping ratio generally decreases with the increase of wind speed, it basically shows positive values under low wind speeds but may become negative under high wind speeds. Although the aerodynamic damping ratios identified by different methods were not the same, both of them show consistent variation pattern of aerodynamic damping.
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