[1]李正农,张梦宇,胡耀耀.典型风场的分形特征及分形模拟[J].地震工程与工程振动,2019,39(01):018-26.[doi:10.13197/j.eeev.2019.01.18.lizn.003]
 LI Zhengnong,ZHANG Mengyu,HU Yaoyao.Fractal characterization and fractal simulation in different wind fields[J].EARTHQUAKE ENGINEERING AND ENGINEERING DYNAMICS,2019,39(01):018-26.[doi:10.13197/j.eeev.2019.01.18.lizn.003]
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典型风场的分形特征及分形模拟
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《地震工程与工程振动》[ISSN:/CN:]

卷:
39
期数:
2019年01
页码:
018-26
栏目:
论文
出版日期:
2019-02-28

文章信息/Info

Title:
Fractal characterization and fractal simulation in different wind fields
作者:
李正农 张梦宇 胡耀耀
湖南大学 建筑安全与节能教育部重点试验室, 湖南 长沙 410000
Author(s):
LI Zhengnong ZHANG Mengyu HU Yaoyao
Key Laboratory of Building Safety and Efficiency of the Ministry of Education, Hunan University, Changsha 410000, China
关键词:
风洞试验分形模拟盒维数湍流度功率谱
Keywords:
wind tunnel testfractalsimulationbox-countingdimensionturbulencewind speed spectrum
分类号:
TU973
DOI:
10.13197/j.eeev.2019.01.18.lizn.003
摘要:
本文对于由风洞试验得出的不同风场类别的脉动风速进行了盒维数的分析,发现各类风场的盒维数明显不同,而采用传统数值模拟方法模拟的A、B、C三类风场的脉动风速的盒维数几乎没有变化。为了弥补脉动风速传统数值模拟方法的缺陷,采用包含分形维数的Weierstrass-Mandelbro函数模拟A、B、C三类风场的脉动风速,并与由风洞试验得到的各类风场的脉动风速的盒维数,湍流度,功率谱等特征进行对比。结果表明分形模拟方法所得的脉动风速的盒维数在各类风场中明显不同,且随着湍流度的增大而减小,并且分形模拟方法模拟的脉动风速谱和风洞试验的脉动风速谱更加接近。
Abstract:
This paper analyzes the box-counting dimension of wind speed in different wind fields from wind tunnel test, proving that the box-counting dimensions of wind speed in different fields are different. However, the box-counting dimensions obtained from traditional numerical simulation method are almost unchanged. In order to avoid the shortcomings of traditional numerical simulation method, the Weierstrass-Mandelbro function was adopted to simulate the wind speed in different wind fields with A, B and C types land surface roughness. And the wind speed box-counting dimension, the turbulence and power spectrum of the fractal simulated wind speed were compared with those in wind tunnel test. The results show that the box-counting dimensions of wind speed obtained from fractal simulation method are abviously different when the conditions of wind fields are different. In addition, the box-counting dimensions decrease with the increase of turbulence. Moreover, the wind speed spectrum simulated by fractal simulation method is closer to wind speed spectrum in wind tunnel test.

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备注/Memo

备注/Memo:
收稿日期:2018-04-16;改回日期:2018-07-21。
基金项目:国家自然科学基金项目(51478179)
作者简介:李正农(1962-),男,教授,博士,主要从事结构抗震抗风研究.E-mail:zhn88@263.net
更新日期/Last Update: 1900-01-01