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高速列车—轨道—路基耦合系统垂向振动特性分析
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摘要
高速铁路以运行速度快、运输能力大、能源消耗低、环境影响轻、土地占用少、安全性好、正点率高等综合优势,在世界各国得到了迅速发展。然而,列车运行速度的提高和载重的不断增加,使得车辆、轨道与路基之间的动力相互作用越来越大,行车的安全性和舒适性、轨道结构的安全性问题也越来越突出。因此,对车辆轨道路基耦合系统动力学问题的研究具有重要意义。本文主要工作和研究内容如下:
     (1)建立了车辆轨道路基耦合动力分析模型。将车辆轨道路基耦合系统分解成三个子系统:车辆子系统、轨道路基子系统和轮轨子系统。根据对车辆结构和轨道结构的假定,分别建立了车辆和轨道路基两个子系统模型,并由达朗贝尔原理建立了车辆动力学方程和轨道路基系统动力学方程。针对轮轨子系统,垂向处理采用了Hertz非线性弹性接触理论。
     (2)介绍了轨道不平顺的种类和常见的数值积分方法。本文以谐波不平顺作为系统激励,采用新型快速显式积分法对耦合系统动力学的方程进行逐步积分。并列出了对系统进行数值求解的程序流程图。
     (3)采用新型快速显式积分法对车辆轨道路基耦合系统的垂向振动响应进行数值计算,分析了不同轨道结构、列车速度、轨枕间距、轨道不平顺、车体质量以及道床厚度等参数对耦合系统结构动力响应的影响规律。
With its comprehensive advantages such as the high operating speed, largetransport capacity, low energy consumption, light pollution of the environment, lessoccupation of the land aera, high safety and high punctuality, the high-speed railwayhas been developed rapidly all the world. However, with the improving of train speedand the increasing of load, the dynamic interaction of Vehicle-Track-Subgrade isbecoming more and more serious, the safety and comfort of the running train, thereliability of tracks and subgrade structure are even more conspicuous. Therefore, theresearch of Vehicle-Track-Subgrade coupled dynamics problem is of great significantIn this paper, the main work are as follows,
     (1) The dynamic analysis model for Vehicle-Track-Subgrade coupled system isestablished. The coupled system is divided into three subsystems: the vehiclesubsystem, the track-subgrade subsystem and wheel-track subsystem. Based on theassumptions of vehicle structure and track-subgrade structure, vehicle model andtrack-subgrade model are built respectively, and the dynamic equations of vehicle andtrack-subgrade system are derived by using the D’Alembert principle. For thewheel/rail subsystem, the vertical interaction is handled as the nonlinear interactionelastic Hertz contact.
     (2) The track irregularity and the kinds of common numerical integration methodare introduced. Based on the harmonic irregularity as the excitation system, thedynamic equation of the coupling system is integrated step by step by using the newdisplay integral method. And the program flow chart of integral solution for system isgiven.
     (3) With the Vehicle-Track-Subgrade vertical vibrating response calculatingprocedure is programmed by using the new display integral method on the platformMatlab software, The coupled system dynamic response are analyzed with the effectsof different track structures, velocity, sleeper spacing, track irregularity, body mass, thickness of ballast.
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