文档介绍：同济大学汽车学院硕士学位论文轮轨垂向耦合振动下车辆的响应研究姓名:江翁申请学位级别:硕士专业:车辆工程指导教师:胡用生 20080301 摘要摘要铁路作为我国的大动脉,承担着货运与客运的两大重要任务。在货运方面. 我国不断研制高轴重、快运货车以满足对货运量不断增长的要求;而客运方面, 不断对现有客运车辆进行提速和引用并发展新型高速轨道车辆。货运重载化以及客运高速化无疑会加剧车辆与轨道问相互作用。本文采用基于Timoshenko粱的有限元轨道一车辆垂向耦合模型分析高速、重载下的轮轨间相互作用力问题。本文详细介绍了基于Timoshenko梁的有限元轨道振动推导过程、轮轨问相互关系的两种模拟方法、钢轨扣件的模拟等数学建模过程以及擦伤、波浪型磨耗、焊接凸台、轨枕悬空等典型轮轨间激扰的数学模型。采用Matlab开发了有限元轨道一车辆垂向耦合模型的仿真软件。轮轨耦合振动的求解则采用隐式 Newmark法,同时鉴于有限元轨道形成的大型刚度、阻尼、质量矩阵特点,在程序开发中采用窄带宽稀疏矩阵存储方式并采用高斯消去法求解大型线性矩阵。采用有限元轨道一车辆垂向耦合模型研究了旧车轮擦伤、波浪型磨耗、轨枕悬空等的动力学效应。针对目前的高轴重情形,研究了轮轨问相互作用影响因素并对降低轮轨间相互作用的措施进行了探讨。最后针对无缝焊接长钢轨上普遍存在的焊接凸台以及焊接区域短波不平顺研究了高速列车与轨道间相互作用问题。最后,关于进一步工作方向进行了简要的讨论。关键词:Timoshenko梁,有限元,垂向耦合,重载, 高速 ABSTR ACT 越the main artery ofwhole national economy,railway takes on two important tasks:freight and passenger order tomeet therequirement offeight and passenger transportation,we try our best todevelop heavy load freight car and high speed passenger are doubtless tobring new vitalforce forrailway research the dynamic interactions between track and railway vehicle,especially heavy load freight car and high speed passenger car,based on track with Timoshenko beam on discrete support and vehicle coupling model. Firstly,according tOtheenergy method andTimoshenko beam theory,the FEM tfackwas introduce two methods about how tocalculate the vertical fbrce between vehicle and track ware introduced and how tosimulate theproperty of lastintroduce some classical irregularity such aswheel fiatand SO program was developed based on Matlab tosimulate theverticalcoupIing interaction between vehicle and integration adopted famous Newmark method· According thecharacter ofstiffness、damping、mass matrix,the normalmemory and solvemethod used inFEM tostore thesparse band matrix. As theengineering application,the interaction between vehicle and trackdue tovafious wheel/rail excitations such aswheel fiat,railcorrugation,the condition clearan