多变量三维风场的简化及应用
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摘要
三维空间风场在三个方向上相关性很小,可认为各个方向是相互独立的。对于输电线路的影响而言顺风向脉动作用是主要的,远大于其它两个方向,可简化为一维风场计算。以小波为分析工具,实现由风载荷功率谱到风速-时间历程的转变,并对模拟结果进行了比较。研究结果表明:小波分析在风载荷模拟中可靠性较高,可为输电线路风响应的进一步研究提供参考。
The correlation in three directions of the three-dimensional wind field is very small,it can be thought as independent in every direction.The along wind direction which is much more important than the other two directions for transmission line can be simplified as the only calculated direction.The wavelet analysis is used as the tool to simulate the wind velocity by the change from the power spectrum of the wind to the wind-time history,and the simulated results are compared.The results show that: the wavelet analysis has an ideal reliability on the wind load simulation,so it can provide the basis for further study for transmission lines’ responses to the wind load.
The correlation in three directions of the three-dimensional wind field is very small,it can be thought as independent in every direction.The along wind direction which is much more important than the other two directions for transmission line can be simplified as the only calculated direction.The wavelet analysis is used as the tool to simulate the wind velocity by the change from the power spectrum of the wind to the wind-time history,and the simulated results are compared.The results show that: the wavelet analysis has an ideal reliability on the wind load simulation,so it can provide the basis for further study for transmission lines’ responses to the wind load.
引文
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[7]Gurley K R,Kareem A.Analysis and simulation tools for wind engineering[J].Eng Mech,1997,12:9-31.
[8]李晓飞.基于小波分析的疲劳应力历程模拟和疲劳损伤研究[D].上海:上海交通大学,2002.
[2]李宏男,白海峰.高压输电塔-线体系抗灾研究的现状与发展趋势[J].土木工程学报,2007,40(2):39-46.
[3]Miha B,JankoS.Enhancements to the continuous wavelet transform for damping identifications on short signals[J].Mechanical Systems and Signal Processing,2004,(18):1065-1076.
[4]张希黔,葛勇,严春风,等.脉动风场模拟技术的研究与进展[J].地震工程与工程振动,2008,28(6):206-211.
[5]白海峰,李宏男.大跨越输电塔线体系随机脉动风场模拟研究[J].工程力学,2007,24(7):146-151.
[6]Li Hongnan,Wang Qianxin.Dynamic characteristics of long-span transmission lines and their supporting towers[J].China Civil Eng J,1997,30(5):28-36.
[7]Gurley K R,Kareem A.Analysis and simulation tools for wind engineering[J].Eng Mech,1997,12:9-31.
[8]李晓飞.基于小波分析的疲劳应力历程模拟和疲劳损伤研究[D].上海:上海交通大学,2002.
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