摘要
采用计算流体力学方法,研究峡谷地形下三维风场的空间分布特性,获得风速和风攻角随空间和地形参数的变化规律。在有限元软件中构建接触网非线性模型。考虑脉动风场的空间和时间相关性,采用四阶AR法生成山区峡谷中接触网沿线的三维随机风场,对典型峡谷下接触网的风振特性进行研究。结果表明:在“峡谷效应”的影响下,接触线在沿峡谷走向方向和竖向的振幅均大幅增加;当山高和谷宽之比达到一定数值,且来流风与谷口轴线角度较小时,风经“峡谷效应”作用后对接触网风振响应位移的增大作用十分明显。通过对西南山区某真实峡谷的研究发现,其峡谷风的空间分布特性与典型峡谷趋于一致,但是,真实峡谷的复杂地形导致峡谷内风速和攻角的空间分布特性更加复杂,从而引起更加复杂的接触网风振行为。
In this paper,the computational fluid dynamics(CFD)method was used to study the spatial distribution characteristics of three-dimensional canyon wind field,and the variation of the wind speed and the angle of wind attack along with the spatial and canyon parameters was obtained.Based on the spatial and temporal correlation of the fluctuating wind field,the fourth-order AR method was used to generate the three-dimensional random wind field along the catenary between mountain canyons.A nonlinear finite element model of the catenary was constructed to study the wind-induced vibration of the catenary in typical canyons.The results show that under the influence of channeling effect,the vibration amplitude of the catenary along the canyon direction and vertical direction increases significantly.With a certain value of the ratio of mountain height to canyon width and the small angle between the inlet air and the axis of the canyon mouth,the wind,after the action of the channeling effect,has a significant influence on the increase of wind induced vibration response displacement of the catenary.Through the study of a real-world canyon in southwest mountainous area,it is found that the spatial distribution characteristics of canyon wind are consistent with those of typical canyon.However,the complex terrain of the real-world canyon leads to more complicated spatial distribution of wind speed and angle of attack in the canyon,which results in more complicated wind vibration behaviors of the catenary.
作者
吴凡平
徐钊
刘志刚
宋洋
杨佳
WU Fanping;XU Zhao;LIU Zhigang;SONG Yang;YANG Jia(National Rail Transit Electrification and Automation Technique Research Center,Southwest Jiaotong University,Chengdu 610031,China;Department of Structural Engineering,Norwegian University of Science and Technology,Trondheim 7491,Norway;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2021年第5期47-61,共15页
Journal of the China Railway Society
基金
国家自然科学基金(U1734202)
成都国佳电气工程有限公司资助课题(NEEC-2018-A02)
西南交通大学横向课题(2019H0561)。
关键词
峡谷风
接触网
数值模拟
风振
有限元
canyon wind
catenary
CFD
wind-induced vibration
FEM
