【摘要】 基于脉动风的基本特性和Davenport脉动风速谱,提出在时域内采用按时间抽取的快速傅立叶变换技术改进的谐波叠加法对输电塔随机风场进行仿真,以一大跨越输电塔的随机风场为例获得各点的风速时程样本并进行了谱和相关性校验。结果表明,模拟值与目标值吻合、脉动风空间相关特性显著、计算效率大幅提高,验证了该法的有效性和实用性。更多还原

【Abstract】 Based on basic characteristics of fluctuating wind and Davenport’s wind speed spectrum,WAWS method adopting the DIT-FFT technology of the time-domain method was presented,and stochastic wind field of transmission tower was simulated by this method.At last,according to this method,a stochastic wind field of the long-span transmission tower is simulated.Time-history of fluctuating wind speed of different points was obtained,and fluctuating wind speed spectrum and fluctuating wind correlation were checked.In a spectrum comparison,it is found that the simulated wind speed power spectrum agrees well with the target wind speed power spectrum.The spatial correlation of fluctuating wind is relatively remarkable.The calculation efficiency of improved method can be greatly improved.So it is confirmed that the method presented in this paper is valid and practical.更多还原