摘要
针对傅里叶变换的谐波合成脉动风的理论不足,提出一种小波重构合成脉动风方法,以控制频带能量为标准推导脉动风合成公式。通过计算机仿真分析,结果表明小波重构合成的脉动风具有良好的时频非平稳性,能够反映脉动风特性;同时,分析了在合成脉动风时小波函数基的选取方法和分层数的选取。
Because of the shortage of synthesis of fluctuating wind theory by using Fourier transformation,one method of wavelet reconstruction for fluctuating wind synthesis is proposed based on standard of controlling frequency band energy,the formula of fluctuating wind synthesis is deduced.Using computer simulation,the results show that fluctuating wind synthesis with time frequency nonstationarity can reflect normal characteristic of fluctuating wind.At the same time,the selection method of Wavelet bases and hierarchy number is also analyzed here.
出处
《振动与冲击》
EI
CSCD
北大核心
2008年第6期140-143,共4页
Journal of Vibration and Shock
基金
兰州交通大学“青蓝”人才工程基金
甘肃省建设科技攻关项目资助
关键词
脉动风
小波重构
风速度功率谱
时频非平稳性
小波基
fluctuation wind
wavelet reconstruction
power spectra of wind speed
nonstationarity
wavelet bases
