摘要
牵引供电系统的可靠性主要决定于接触网的可靠性,在大风区段,接触网的可靠性受风荷载作用影响较大,有必要对接触网风效应进行分析.接触网风场的模拟是时域法研究接触网风效应的前提,为了快速有效地模拟接触网的风场.基于接触网的基本特性,以Davenport谱为目标谱,对比目前已有的不同模拟方法,选取按时间抽取的快速傅里叶变换(DIT-FFT)优化的谐波合成法(WAWS)来模拟风场.通过该方法模拟一段3跨4柱接触网上7个不同点的风场,对比模拟得到的风场的功率谱和目标功率谱十分接近;分析风速时程的统计特性可得两者的均值和方差相差都很小,说明该方法能够有效模拟接触网的风场;计算时间比未经优化的谐波合成法减少34倍.最后利用ANSYS仿真分析了接触网在模拟风场作用下的动态响应,得到了接触线跨中的横向和竖向位移以及接触线张力随时间变化的规律.
The reliability of traction power supply system mainly depends on the reliability of catenary system. In strong wind area, the reliability of catenary system is severely affected by wind load. It is imperative to analyze the wind effects on catenary. Wind field simulation is the premise of time domain method researching wind effects on catenary. To simulate wind field of catenary fast and effectively, based on basic features of catenary, used Davenport spectrum as objective spectrum, decimation-in-time fast Fourier transform（DIT-FFT） optimized weighted amplitude wave superposition（WAWS） method was chosen to simulate wind field. The wind field of a three-span four-post catenary was simulated. The power spectral of simulated wind field are very close with objective power spectrum. The statistical character analysis shows there is little difference between average value and variance. It indicates that this method can simulate catenary wind field effectively and the computing time reduced 34 times than that of non- optimized WAWS method. At last, dynamic response of catenary under simulated wind field was analyzed by ANSYS simulation. Variations of lateral and vertical displacements of middle of contact wire, also the contact wire tension were obtained.
出处
《空间结构》
CSCD
北大核心
2013年第2期63-69,共7页
Spatial Structures
基金
科技部科技支撑项目(E10B300010)
北京交通大学校基本科研业务费资助项目(E11JB00110)
