计及风沙流影响的接触线振动响应研究
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摘要
基于风沙荷载的协同激励会加剧接触线的摆动幅度、增大事故发生概率,为了加深对接触网风沙荷载致振机理的认识,利用有限元软件ANSYS建立兰新高铁接触网模型,采用谐波叠加法模拟脉动风场,通过流体力学软件Fluent获得接触线气动系数并计算风沙荷载,仿真分析风沙流对接触线振动的影响。研究结果表明:风沙流作用下接触线气动系数随攻角的变化趋势与净风基本一致;接触线横向、垂向振动位移随携沙量的增大而变大,风速20 m/s攻角0°沙粒体积分数取0.000 100时,横向、垂向最大振动位移分别比净风增大21.9%和12.0%;接触线的横向、垂向振动位移增长率与沙粒体积分数之间均符合高度线性相关关系,相关系数都近似等于1。
The cooperative excitation of wind and sand load can intensify the fluctuation amplitude of contact wire and increase the probability of the accident. In order to deepen the understanding of the vibration mechanism when the wind and sand load act on the catenary, the catenary model of Lan-Xin high speed railway was established with the finite element software ANSYS. The weighted amplitude wave superposition method was adopted to simulate the fluctuating wind field. The load of wind and sand was calculated by the aerodynamic parameters of the contact wire which was obtained by the computational fluid dynamics software Fluent. The influence of wind sand flow on the vibration of contact line was analyzed by simulation. The results showed that the variation of aerodynamic parameters of contact wire under the action of wind sand flow was consistent with pure wind along with the change of attack angles; the transverse and vertical displacements of the contact line become larger with the increase of sand carrying capacity. In the case of 20 m/s wind speed and 0° attack angle,when the volume fraction of sand grains is 0.000 100, the transverse and vertical maximum vibration displacements are increased by 21.9% and 12.0%, respectively, compared with the pure wind. The relationship between the growth rate of transverse and vertical vibration displacements and the sand volume fraction is highly linear, and the correlation coefficients are approximately equal to 1.
The cooperative excitation of wind and sand load can intensify the fluctuation amplitude of contact wire and increase the probability of the accident. In order to deepen the understanding of the vibration mechanism when the wind and sand load act on the catenary, the catenary model of Lan-Xin high speed railway was established with the finite element software ANSYS. The weighted amplitude wave superposition method was adopted to simulate the fluctuating wind field. The load of wind and sand was calculated by the aerodynamic parameters of the contact wire which was obtained by the computational fluid dynamics software Fluent. The influence of wind sand flow on the vibration of contact line was analyzed by simulation. The results showed that the variation of aerodynamic parameters of contact wire under the action of wind sand flow was consistent with pure wind along with the change of attack angles; the transverse and vertical displacements of the contact line become larger with the increase of sand carrying capacity. In the case of 20 m/s wind speed and 0° attack angle,when the volume fraction of sand grains is 0.000 100, the transverse and vertical maximum vibration displacements are increased by 21.9% and 12.0%, respectively, compared with the pure wind. The relationship between the growth rate of transverse and vertical vibration displacements and the sand volume fraction is highly linear, and the correlation coefficients are approximately equal to 1.
引文
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[13]尹永顺.砾漠大风地区风沙流研究[J].中国沙漠, 1989,9(4):27-36.YIN Yongshun. Study on sand drift in strong wind region in gravel desert[J]. Journal of Desert Research, 1989, 9(4):27-36.
[2]曹树森.电气化铁路接触网体系环境荷载下动力可靠性研究[D].成都:西南交通大学, 2011.CAO Shusen. Research on the dynamic reliability of electrified railway catenary system subjected to environmental loads[D]. Chengdu:Southwest Jiaotong University, 2011.
[3] Stickland M T, Scanlon T J. An investigation into the aerodynamic characteristics of catenary contact wires in a cross-wind[J]. Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail&Rapid Transit, 2001, 215(4):311-318.
[4] Stickland M T, Scanlon T J, Craighead I A, et al. An investigation into the mechanical damping characteristics of catenary contact wires and their effect on aerodynamic galloping instability[J]. Proceedings of the Institution of Mechanical Engineers Part F Journal of Rail&RapidTransit, 2003, 217(2):63-71.
[5]刘煜铖,刘志刚,宋洋,等.高速铁路接触线静态气动力参数仿真计算研究与风洞试验[J].铁道学报, 2014,36(5):33-38.LIU Yucheng, LIU Zhigang, SONG Yang, et al.Simulation calculation and wind tunnel test of static aerodynamic parameters of high-speed railway contact line[J]. Journal of the China Railway Society, 2014, 36(5):33-38.
[6]汪宏睿,刘志刚,宋洋,等.高速铁路接触线气动参数仿真及风振响应研究[J].振动与冲击, 2015, 34(6):6-12.WANG Hongrui, LIU Zhigang, SONG Yang, et al.Aerodynamic parameters simulation and wind-induced vibration responses of contact wire of high-speed railway[J]. Journal of Vibration and Shock, 2015, 34(6):6-12.
[7]宋洋,刘志刚,汪宏睿.高速铁路覆冰接触线气动系数研究与风振响应分析[J].铁道学报, 2014, 36(9):20-27.SONG Yang, LIU Zhigang, WANG Hongrui. Study on aerodynamic parameters and wind vibration responses of iced contact wires of high-speed railways[J]. Journal of the China Railway Society, 2014, 36(9):20-27.
[8]谢强,王巍,李海若.高速铁路接触线气动力特性的风洞试验研究[J].中国铁道科学, 2012, 33(6):75-81.XIE Qiang, WANG Wei, LI Hairuo. Wind tunnel test on the aerodynamic characteristics of contact wire for high-speed railway[J]. China Railway Science, 2012,33(6):75-81.
[9] Muscolino G, Sofi A. Bounds for the stationary stochastic response of truss structures with uncertain-but-bounded parameters[J]. Mechanical Systems&Signal Processing,2013, 37(1/2):163-181.
[10] Aas K. Time domain buffeting response calculations of slender structures[J]. Journal of Wind Engineering&Industrial Aerodynamics, 2001, 89(5):341-364.
[11]谢将剑,王毅,苑玉超,等.基于DIT-FFT优化WAWS法的接触网风致响应分析[J].空间结构, 2013, 19(2):63-69.XIE Jiangjian, WANG Yi, YUAN Yuchao, et al.Wind-induced dynamic response analysis of catenary based on DIT-FFT optimized WAWS method[J]. Spatial Structures, 2013, 19(2):63-69.
[12]翟之平,杨忠义,高博,等.基于Mixture模型的叶片式抛送装置内气固两相流模拟[J].农业工程学报,2013, 29(22):50-58.ZHAI Zhiping, YANG Zhongyi, GAO Bo, et al.Simulation of solid-gas two-phase flow in an impeller blower based on Mixture model[J]. Transactions of the Chinese Society of Agricultural Engineering, 2013,29(22):50-58.
[13]尹永顺.砾漠大风地区风沙流研究[J].中国沙漠, 1989,9(4):27-36.YIN Yongshun. Study on sand drift in strong wind region in gravel desert[J]. Journal of Desert Research, 1989, 9(4):27-36.