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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 the traction power supply system is mainly determined by the reliability of the catenary. In the gale section, the reliability of the catenary is greatly affected by the wind load, so it is necessary to analyze the catenary’s wind effect. In order to simulate the wind field of catenary network quickly and effectively based on the premise of time-domain method of catenary wind effect, based on the basic characteristics of catenary network, taking Davenport spectrum as the target spectrum, compared with the existing simulation methods, (WAWS) is used to simulate the wind field.Through this method, we simulate the wind field of 7 different points on a 3-span 4-column contact net and compare the results of simulated wind field The power spectrum is very close to the target power spectrum; the statistical characteristics of wind speed time history can be analyzed to show that the difference between the mean and variance of the wind power spectrum is very small, which shows that this method can effectively simulate the wind field of catenary network; The synthetic method is reduced by 34 times.Finally, the dynamic response of catenary under simulated wind field is analyzed by ANSYS simulation, and the horizontal and vertical displacement of contact line span and the variation of contact line tension with time are obtained.