摘要
针对典型大跨度球面网壳结构,在同济大学TJ-3大气边界层风洞试验室进行了刚性模型测压试验.首先,利用游程分析方法验证了风力信号的非平稳特性.其次,使用离散小波变换对其1∶200的模型结构风力信号在各尺度进行分解,得到各尺度小波系数时程曲线.为量化分析风力间歇特性,对尺度能量分布,间歇因子及间歇能量分布进行了分析和比较.研究表明:风场类型对阻力系数及Z向升力系数的平稳特性,以及对高尺度区间歇能量比率及间歇因子影响较大,而对各尺度风力系数尺度能量比率的影响均较小.各尺度下,整体阻力系数与Y向升力系数呈现正相关,而与Z向升力系数呈现负相关,并且整体阻力系数与Y向升力系数的相关性随着尺度增大而增大.
The pressure measurement of rigid model for long-span spherical shells structure was con- ducted at TJ-3 wind tunnel laboratory. Firstly, the non-stationary characteristics of wind pressure signals were verified by the run theory. Secondly, the wind signals of 1 ： 200 model structures were decomposed in the different scales by discrete wavelet transform, and the time-history curves of wavelet coefficients were obtained. For the quantitative analysis of intermittent characteristics of wind, the distribution of scale energy, intermittent factors, and intermittent energy were analyzed and compared. The studies show that wind field category had great influence on the stationary characteristics of drag coefficient and Z-direc- tion lift coefficient as well as the intermittent energy ratio and intermittency factor in high scale region, but had small influence on the scale energy ratio of wind coefficients in the different scales. In the different scales, the overall drag coefficient presents positive correlation with Y-direction lift coefficient and negative correlation with Z-direction lift coefficient. In addition, the correlations between overall drag coefficient and Y-direction lift coefficient increased with the increase of scales.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第11期78-85,共8页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51378396)
中国博士后科学基金资助项目(2014M560706)~~
关键词
球面网壳
小波变换
风力系数
尺度能量比率
间歇因子
间歇能量比率
spherical shells s wavelet transforms force coefficients scale energy ratios intermittent factor
intermittent energy ration
