波浪面对车桥气动特性影响下的车桥系统耦合仿真研究

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摘要为研究波浪形底面对列车-桥梁气动荷载影响下的车桥系统振动响应，选取平潭海峡元洪水道大桥为研究对象，固定列车车速和风速，采用流体动力学软件FLUENT，计算系统在横风作用及不同波浪形底面下列车和桥梁的气动荷载。基于有限元软件ANSYS和多体动力学软件SIMPACK建立三维列车-桥梁联合仿真模型，将得到的气动荷载通过时间激励方式施加到列车-桥梁系统中。研究相同车速和风速在不同波浪重现期下波浪形底面对气动荷载的影响以及车桥耦合振动问题。研究结果表明：(1)底面为平面时，风速剖面近似呈线性增长，且风速梯度显著大于底面为波浪形的工况；底面为波浪面时，各重现期下风场特性差异较小，波谷临近处速度梯度较小，向两侧波峰逐渐增大。(2)风场中不同重现期波浪面的改变会使列车和桥梁的气动荷载的频率、幅值大小发生不同程度的改变。(3)底部为平面时，桥梁的阻力、升力和力矩气动荷载峰值均小于底部为波浪面时的荷载峰值。(4)列车的安全性指标均随着波浪重现期的增大而增大，其中横向力和轮重减载率的增幅较明显，100年波浪重现期下列车头车横向力、减载率和横向加速度分别比无波浪时增大了13.45%、23.08%和37.61%。(5)桥梁跨中横向最大位移与横向最大加速度均随波浪重现期的增大而增大，竖向则变化不大。

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	郭晨
	崔圣爱
	曾慧姣
	张猛
	祝兵

关键词 ：波浪形底面, 气动荷载, 耦合, 联合仿真

Abstract：In order to study the Co-Simulation of Train-Bridge System under the aerodynamic load of the train bridge which influenced by various wave profiles. Taking the Yuanhong-channel Bridge in Pingtan Strait as the research object, the train speed and wind speed are fixed, and the hydrodynamic software FLUENT is used to calculate the aerodynamic load of the train and Bridge. A 3D train-bridge co-simulation model is established based on the FE software ANSYS and the MBD (multi-body dynamics) software SIMPACK. The aerodynamic load is obtained and applied to the train-bridge system through time excitation. Under the fixed vehicle and wind speed, dynamic indexes of train-bridge with aerodynamic load which affected by difference wave profiles were performed. The results show that: (1) when the bottom is planar, the wind speed profile increases linearly, and the wind speed gradient is significantly larger than that of the wave surface conditions; the wind field characteristics with wave profiles is small have no remarkable difference, the velocity gradient near the wave trough is small, and it gradually increase to side peaks. (2) The wave profile in different return periods will change the frequency and amplitude of train-bridge aerodynamic loads. (3) When the bottom is planar, the maximum value of resistance, lift and moment of the bridge is smaller than that of the wave profile conditions. (4) The safety indexes of train increase as the increase of wave recurrence period, in which the transverse force and wheel unload rate are more significantly. Compared with planar bottom, the transverse force, load reduction rate and transverse acceleration of 100-year wave recurrence period of the head vehicle increased by 13.45%, 23.08% and 37.61%, respectively. (5) As the increase of wave recurrence period, the maximum lateral displacement and acceleration of the mid-span become larger, while the vertical change has no significant change.

Key words： bottom of wave profile aerodynamic load coupling co-simulation

收稿日期: 2020-06-24 出版日期: 2021-12-15

引用本文:

郭晨，崔圣爱，曾慧姣，张猛，祝兵. 波浪面对车桥气动特性影响下的车桥系统耦合仿真研究[J]. 振动与冲击, 2021, 40(23): 260-268.
GUO Chen, CUI Sheng’ai, ZENG Huijiao, ZHANG Meng, ZHU Bing. Joint simulation of vehicle-bridge system with aerodynamic characteristics affected by various wave bottom surfaces. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(23): 260-268.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I23/260

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