跳车冲击力作用下车桥耦合动力学数值分析

发布时间：2018-04-19 21:43

本文选题：不平顺 + 车桥耦合　；参考：《固体力学学报》2016年06期

【摘要】：考虑到传统的Hertz弹簧模型进行车桥耦合动力学分析存在诸多问题,基于简单的车桥耦合模型,导出了车桥耦合与非耦合动力学方程.考虑轨道周期和随机不平顺情况,车辆在不平顺轨道曲线上运行时,当离心力大于车辆自重时,自动确定车辆的起跳时间和起跳高度.起跳后的车辆在重力作用下,将重新回到梁上,同时对梁有一冲击作用力.文章假设了此冲击力的作用规律,并由有限元模拟确定冲击力系数.通过自编程序,对单轴行车简支梁进行了数值计算.数值分析结果表明,考虑跳车冲击力的动力模型能够更加精准地反应车桥耦合振动特征,且本模型首次给出了跳车高度.考虑轨道具有相同幅值的周期不平顺和随机不平顺时,轨道随机不平顺将导致桥梁,尤其是车辆的响应更大,舒适性更差或结构更危险,在车桥耦合动力学分析中应重点关注.
[Abstract]:Considering that there are many problems in the traditional Hertz spring model for vehicle-bridge coupling dynamic analysis, based on the simple vehicle-bridge coupling model, the vehicle-bridge coupling and non-coupling dynamic equations are derived. Considering the track cycle and random irregularity, when the vehicle runs on the track irregularity curve, when the centrifugal force is larger than the vehicle weight, the take-off time and the take-off height of the vehicle are determined automatically. After taking off, the vehicle will return to the beam under the action of gravity and have an impact force on the beam at the same time. In this paper, the law of the impact force is assumed, and the impact force coefficient is determined by finite element simulation. Through self-compiled program, the simple beam of single axle crane is numerically calculated. The numerical results show that the dynamic model considering the impact force can reflect the coupled vibration characteristics of the vehicle and bridge more accurately, and the height of the jump is given for the first time in this model. Considering the periodic irregularity and random irregularity of track with the same amplitude, the random irregularity of track will lead to greater response, worse comfort or more dangerous structure of the bridge, especially the vehicle. Therefore, attention should be paid to the analysis of vehicle-bridge coupling dynamics.
【作者单位】：华中科技大学土木工程与力学学院;
【基金】：国家自然科学基金项目(51678264)资助
【分类号】：U441.7;U211.3

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