大跨空间结构风模拟的改进方法及其小波识别  

THE IMPROVED SIMULATION AND WAVELET IDENTIFICATION OF WIND SPEED TIME SERIES FOR LARGE-SPAN SPATIAL STRUCTURES

作　　者：柳杰[1] 周岱[1] 黄剑伟[1] 马骏[1] 

机构地区：[1]上海交通大学船舶海洋与建工学院,上海200030

出　　处：《振动与冲击》2006年第4期21-24,共4页Journal of Vibration and Shock

基　　金：高等学校博士学科点专项科研基金项目(20040248002);上海市基础研究重点项目(04JC14059)资助

摘　　要：大跨空间结构风速时程模拟需考虑风的时间相关性和空间相关性。利用线性滤波器法并结合快速Fou-rier变换(FFT)对球面网壳结构进行多点脉动风速时程模拟,较好地解决风速时程的模拟精度、模拟速度和计算稳定性问题。利用小波变换良好的时频局部化性质和可变的聚焦特性,针对模拟的风速时程低频含量较少的特点,利用haar小波对风速时程进行小波分解和识别,修正分解后的低频含量。计算显示,重构修正后的风速时程在时域和频域上均更逼近目标风速时程。In wind speed time history simulation of large-span spatial structures,both time and spatial correlation should be considered.In this paper,linear filter and fast Fourier transform(FFT) are used to simulate multi-nodal wind speed time process for a spatial shell structure.The computation indicates that better simulating precision,efficiency and computational stability for artificial wind speed time process can be gotten by means of this method.Furthermore,with the excellent time-frequency localization trait and alterable focusing characteristic,Haar wavelet is adopted to decompose,identify and modify artificial wind speed time process.It is clear that artificial wind speed time process through wavelet reconstruction and modification is closer to the target wind speed process both in time-domain and in frequency-domain.

关 键 词：风模拟 小波分析 大跨空间结构 

分 类 号：TU311.3[建筑科学—结构工程]