【作者】 招阳；

【导师】 魏庆朝； 许兆义；

【作者基本信息】 北京交通大学 ， 道路与铁道工程， 2009， 博士

【摘要】 在高速磁浮列车作用下,轨道梁、墩会发生较大的变形和振动,对结构的安全、车辆的运行安全以及旅客的乘坐舒适度会产生很大的影响。针对磁浮系统的车桥振动,到目前为止的研究工作,无论是对连续梁还是简支梁,鲜少考虑墩的作用。随着墩的升高,墩的刚度会影响整个结构体系的动力特性,成为不可忽略的因素。高速磁浮列车引起的梁墩体系动力问题已成为当前高速磁浮技术发展遇到的重要课题。本文结合国家自然科学基金资助项目《高速磁浮交通轨道梁动力特性研究》(项目号:50578010)的研究工作,建立了考虑墩体参振的高速磁浮列车-轨道梁系统动力分析模型,在电磁相互作用和梁墩体系自振特性分析的基础上,以磁浮线路实测不平顺作为外界激励源,对高速磁浮列车运行时所引起的车辆、轨道梁、墩的各项动力响应进行了计算分析,得出了高速磁浮列车引起的梁墩体系动力响应基本规律,从而为高速磁浮梁墩参数选取和方案选择提供理论基础与参考建议。全文具体开展了如下几方面的研究工作:(1)分析了高速磁浮列车、轨道梁、墩系统的电磁学、力学耦合关系,运用结构动力学、车辆动力学及电磁控制理论原理,采用模态综合技术,建立了考虑墩体参振的高速磁浮列车-轨道梁系统动力分析模型,给出了具体求解步骤。基于本文的分析理论以及多年的科研积累,独立编制了车-梁-墩动力分析程序。通过现场试验结果验证理论模型和分析方法的有效性。(2)分析了磁浮线路平纵横面和线路结构主要特点,介绍了磁浮系统参数、轨道梁和下部结构相关技术要求,对乘坐舒适度控制指标、轨道梁及下部结构相关技术要求和参数选定依据和影响因素进行了综合分析,并和高速铁路相关标准进行了对比研究,为梁墩体系动力性能评价提供了评判标准。(3)建立了电磁相互作用数学模型,研究了控制方案、控制参数、轨道梁参数对悬浮性能的影响规律,确定了保证高速磁浮列车稳定悬浮的磁轨参数匹配关系,提出了控制悬浮阶段过大振动的原则。(4)以工程实践为背景,建立了磁浮交通轨道梁墩体系有限元模型,采用子空间迭代法计算了梁墩体系特征值和模态,分析了不同梁型、约束、墩高、墩重、跨数等因素对梁墩体系自振特性的影响,阐明了恒载作用下轨道梁墩体系动力特性,为进一步分析高速磁浮列车作用下梁墩体系动力响应及运行安全性和舒适性奠定基础。(5)采用车-梁-墩动力相互作用模型,以磁浮线路实测不平顺作为外界激励源,对高速磁浮列车运行时所引起的车辆、轨道梁、墩的各项动力响应进行计算分析,研究了梁墩体系垂向共振和横向共振条件,对简支梁和两跨连续梁进行了动力学性能分析评估,阐明了高速磁浮列车作用下轨道梁墩体系动力特性。图119幅,表20个,参考文献138篇。更多还原

【Abstract】 Obvious deformation and vibration for guideway and piers,which influence structure safety,car running,and riding comfort of passengers directly,will appear when high-speed maglev trains run on the guideway/pier system.Studies on response of both simple and continuous guideway girders in maglev system have rarely taken account in the effect of piers until now.However,the influence of piers on dynamic characteristics of the whole structure will not be ignored with their heights getting larger and have great effect on the stiffness of the system.The dynamic interaction of maglev train and guideway/pier system has become an important problem in the course of high-speed maglev transport construction.A high-speed maglev train/guideway dynamic model considering pier vibration is established in the thesis.Based on the anlysis on the electromagnetic interaction and natural vibration of the guideway/pier system,the dynamic responses of vehicle, guideway and pier are calculated with the in-suit tested irregulaties as the outside motivation for the train-guideway-pier system.According to the simulation,the basic principle of the dynamic responses may provide theoretic foundation and refrence for parameter choice and scheme selection.The main research is as follows.(1) Based on the analysis on the electromagnetic and mechanical coupling relationship between the high-speed maglev train,guideway and pier,a dynamic model is established by means of modal analysis.The model applies theories of structure dynamics,vehicle dynamics and electromagnetic control.A programme on trainguideway -pier dynamic analysis is written,whose calculating results are validated by in-suit tested datum.(2) The characters of the horizontal,vertical,longitudinal section and structures on the maglev line are concluded.The technical requirements on system parameter, guideway and supporting structure are listed.The influence factors on the control parameters of riding comfort,guideway and supporting structure deformation are analyzed and compared with those of high-speed railway.The research here privides evaluating standard for dynamic performance of the guideway/pier system.(3) A electromagnetic interaction model is established,by means of which the influence of control scheme,control paremeters,guideway parameters on suspension performance are discussed.A series of electromagnetic parameters that ensure steady suspension are gained,the principles that may suppress oversize vibration are brought out.(4) A maglev guideway/pier system is established according to the engineering practice and calculate the eigenvalues and modes by subspace iteration method.The influence of guideway type,restraint,height and mass of pier,span numbers on natural vibration of the guideway/pier system are studied.The dynamic characteristics of the guideway/pier system provide foundation for analyzing the running safety and riding comfort when maglev trains run on the system.(5) The dynamic responses of the train,guideway and pier are simulated by the maglev train-guideway-pier model with in-suit tested irregularities as outside motivation.The vertical and horizontal resonances of the guideway/pier system are analyzed and the dynamic performance of the single and continuous guideway are evaluated.119 figures,20 tables,138 references.更多还原