脉动风速互随机Fourier谱函数  

Cross Stochastic Fourier Spectrum Function of Turbulence Wind Velocity

作　　者：张琳琳[1] 李杰[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《建筑科学与工程学报》2006年第2期57-61,共5页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(50321803)

摘　　要：为了在随机Fourier谱中考虑风场的空间相关性,首先在经验物理关系的意义上定义了互随机Fourier谱,其表达式由两个随机过程的随机Fourier谱和一个可以反映风场空间相关性的随机相干函数组成;然后,利用现场实测风速资料,研究并建立了实际风场的随机相干函数的经验物理模型;最后,基于假设检验理论,确定了互随机Fourier谱函数中基本随机参数及其概率密度信息。实例表明,建立的互随机Fourier谱函数可以在概率的意义上很好地表征实际风场的空间相关性。In order to consider the spatial correlation of wind field within the stochastic Fourier spectrum, cross stochastic Fourier spectrum was defined on the basis of the meaning of empirical physical relationship. The formula of the cross stochastic Fourier spectrum consisted of two stochastic Fourier spectrum functions of two stochastic processes and their stochastic coherence function, which could be used to reflect the spatial correlation of wind field. Then, the empirical physical model of the stochastic coherence function of real wind field was researched and established by means of the real wind field data. Finally, the basic parameters and their probability density functions within the stochastic coherence function were determined based on the hypothesis testing theory. It is demonstrated that the proposed cross stochastic Fourier spectrum function can represent the spatial correlation very well in terms of probability.

关 键 词：互随机Fourier谱 相干函数 地面粗糙度 基本风速 

分 类 号：TU973.32[建筑科学—结构工程]