大跨度单层柔性光伏支架结构气动阻尼的试验研究  

Aero-elastic experiment investigation on the aerodynamic damping of large-span single-layer cable-suspended photovoltaic modules

作　　者：徐海巍[1] 李俊龙 何旭辉[3] 杜航 丁焜炀 楼文娟[1] XU Haiwei;LI Junlong;HE Xuhui;DU Hang;DING Kunyang;LOU Wenjuan(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Huadong Engineering Corporation Limited,Hangzhou 311122,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]浙江大学建筑工程学院,杭州310058 [2]中国电建集团华东勘测设计研究院有限公司,杭州311122 [3]中南大学土木工程学院,长沙410075

出　　处：《振动与冲击》2024年第10期21-29,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51978614);浙江省自然科学基金(LY19E080026)。

摘　　要：大跨光伏支架结构轻柔,在风荷载作用下易产生显著气动效应。为研究该类结构的气动阻尼特征,对不同风速和张力工况下两种典型倾角(0°和10°)的大跨度柔性光伏支架结构开展气弹风洞试验。基于气弹模型风洞试验结果,分别利用经验小波变换(empirical wavelet transform,EWT)和变分模态分解(variational modal decomposition,VMD)结合改进的随机减量方法(random decrement technique,RDT)识别得到了柔性光伏支架结构在不同风速风向、组件倾角和拉索预张力下的气动阻尼比。研究结果表明,气动阻尼对风向角的变化较为敏感。当组件倾斜铺设时(10°倾角),大跨光伏结构气动阻尼在180°迎风向时会出现负值。张力增加可能导致高风速下平铺组件的气动阻尼比显著降低。气动阻尼比随风速的增加整体呈减小趋势,低风速下基本为正值,而高风速下可能出现负气动阻尼。不同方法识别出的气动阻尼比结果存在一定的差异,但反映出的气动阻尼的变化特征具有一致性。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 kind of structure,aeroelastic model wind tunnel tests were carried out on 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 decrement technique(RDT)were used to identify the aerodynamic damping ratio of the 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 the large-span photovoltaic structure shows a negative value under the windward wind azimuth of 180°.The increase of pretension may lead to the decrease of aerodynamic damping ratio of the horizontally installed module at a high wind speed.The aerodynamic damping ratio generally decreases with the increase of wind speed,it basically shows positive values at low wind speeds but may become negative at high wind speeds.Although the aerodynamic damping ratios identified by different methods were not identical,all of them show consistent variation patterns of aerodynamic damping.

关 键 词：变分模态分解(VMD) 经验小波变换(EWT) 气弹试验 气动阻尼 柔性光伏支架结构 

分 类 号：TU399[建筑科学—结构工程]