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重庆交通大学学报（自然科学版）

重庆交通大学学报（自然科学版） ›› 2023, Vol. 42 ›› Issue (9): 137-144.DOI: 10.3969/j.issn.1674-0696.2023.09.19

• 交通装备 • 上一篇    

大跨斜拉桥温度变形下轨道车辆动态特性研究

陈兆玮1，龙权明1，蒲前华1，尚婷2   

  1. (1. 重庆交通大学 机电与车辆工程学院，重庆 400074； 2. 重庆交通大学 交通运输学院，重庆 400074)
  • 收稿日期:2022-04-28 修回日期:2023-06-22 发布日期:2023-10-16
  • 作者简介:陈兆玮(1988—)，男，河南濮阳人，博士，副教授，主要从事车桥耦合振动方面的研究。E-mail:chenzhaowei_cq@163.com 通信作者：龙权明(1996—)，男，四川广安人，硕士，主要从事车桥耦合振动方面的研究。E-mail:lqm_cqjtu@163.com
  • 基金资助:
    国家自然科学基金项目(52008067)；重庆市自然科学基金项目(CSTB2022NSCQ-MSX1193)；重庆市教育委员会科学技术研究项目(KJZD-M202300701)

Dynamic Characteristics of Rail Vehicle under Thermal Deformation of Long-Span Cable-Stayed Bridge

CHEN Zhaowei1, LONG Quanming1, PU Qianhua1, SHANG Ting2   

  1. (1. School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing 400074, China; 2. College of Traffic and Transportation, Chongqing Jiaotong University, Chongqing 400074, China)
  • Received:2022-04-28 Revised:2023-06-22 Published:2023-10-16

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摘要： 为研究大跨斜拉桥温度变形对桥上轨道车辆动态特性的影响，基于车辆-轨道耦合动力学理论，采用有限元法和多刚体动力学建立了地铁车辆-轨道-大跨斜拉桥刚柔耦合动力学模型。借助该模型，首先，分析整体升降温情况下大跨斜拉桥的变形规律；然后，考虑轨道随机不平顺与温度载荷下钢轨变形的综合作用，研究轨道车辆过桥时的动态特性；最后，研究温度载荷和车速对车辆各项动力指标的影响规律。研究结果表明：大跨斜拉桥在温度载荷作用下发生变形，整体表现为升温下挠、降温上拱，且形变量与温度载荷几乎呈线性变化关系；针对研究参数，温度载荷引起的钢轨变形使轮轨垂向力、车辆脱轨系数和轮重减载率分别增大了1.5%、3.1%和5.0%，降温工况下车体垂向加速度减小了2.4%，升温工况下增大了3.7%，车体垂向加速度在升降温情况下的主频主要集中在0~5 Hz，与常温条件下相差很小；脱轨系数和车体垂向加速度受温度载荷影响更大，轮重减载率和轮轨垂向力受速度的影响更为明显。论文结果为后续学者研究温度载荷对大跨斜拉桥上车辆动力响应影响提供一定的参考作用。

关键词: 车辆工程；车-轨-桥耦合振动；大跨斜拉桥；温度载荷；动态特性

Abstract: In order to study the influence of thermal deformation of long-span cable-stayed bridge on the dynamic characteristics of rail vehicles on the bridge, based on the theory of vehicle-track coupling dynamics, the rigid flexible coupling dynamic model of rail vehicle-track-long-span cable-stayed bridge was established by using finite element method and multi-rigid body dynamics. With the help of the proposed model, firstly, the deformation law of long-span cable-stayed bridge under the rise and fall condition of overall temperature was analyzed; then, the comprehensive effect of track random irregularity and rail deformation under temperature load was considered to study the dynamic characteristics of rail vehicles crossing the bridge; finally, the influence law of temperature load and speed on various dynamic indexes of vehicles was studied. The research results show that the long-span cable-stayed bridge deforms under the action of temperature load, and the overall performance is as follows: heating up and bending down, cooling down and arching up, and the deformation changes almost linearly with the temperature load. According to the studied parameters, the rail deformation caused by temperature load increases the wheel rail vertical force, vehicle derailment coefficient and wheel load reduction rate by 1.5%, 3.1% and 5% respectively. The vertical acceleration of the vehicle body decreases by 2.4% under the cooling condition and increases by 3.7% under the heating condition. The main frequency of the vertical acceleration of the vehicle body under the rising and falling temperature conditions is mainly concentrated in the range from 0 to 5 Hz, whose difference is very small compared to normal temperature conditions. The derailment coefficient and vertical acceleration of vehicle body are more affected by temperature load, and the wheel load reduction rate and wheel rail vertical force are more affected by speed. The conclusion provides a certain reference for subsequent scholars to study the influence of temperature load on the dynamic response of vehicles on long-span cable-stayed bridges.

Key words: vehicle engineering; vehicle-rail-bridge coupling vibration; long-span cable-stayed bridge; temperature load; dynamic characteristics

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