【作者】 罗健；

【导师】 莫继良；

【作者基本信息】 西南交通大学 ， 机械工程（专业学位）， 2017， 硕士

【摘要】 在电气化铁路运营系统中,接触网系统为整个动车组提供着电力能量,是必不可少的重要系统之一。列车运行所需的电能通过列车顶部的受电弓与接触网系统中的接触线相对滑动而产生电接触获取。接触网和受电弓(以下简称弓网)间产生的电接触表现,以及接触网装置的服役状态直接影响着动车组受电弓的受流质量、稳定性和安全性,最终决定列车的运行速度与安全。因此,设计并提出中国统一的能够提升弓网间电接触性能的接触网系统参数配置方案,以及适应新时代中国接触网系统要求的新型结构的腕臂定位装置方案,对高速铁路接触网系统的设计具有现实指导意义。本文在综合考虑了广泛调研成果、现行规范及弓网基础理论后,提出了 350 km/h、400 km/h等级高速铁路接触网系统参数优化配置方案。此外,对现有接触网腕臂结构及定位装置的优缺点进行分析,在此基础上初步设计了三种新形式的腕臂和定位装置方案。最终在多方面综合考虑分析后,从中选出了新型腕臂和定位装置的推荐方案。本文主要结论如下:1.根据弓网关系理论、《高速铁路设计规范》以及国内外调研成果制订系统参数方案设计的参数评价标准,具体包括以下几个方面:静态弹性不均匀度、接触力、接触线波动传播速度、离线率、多普勒因数、增强因数和反射因数;基于以上参数评价标准,针对几个主要项目制订了 350 km/h等级接触网系统参数的配置方案,最后从系统安全裕度、装备配套、实际应用情况等几方面再进一步分析,得到推荐配置方案。并通过同样的研究过程,得到400 km/h等级接触网系统参数推荐配置方案。2.利用ABAQUS软件对现有接触网腕臂结构(三种钢结构,一种铝合金结构)及定位装置进行静力学分析,发现各结构在该受力情况下都能满足铁路标准中规定的挠度要求;三种钢腕臂结构挠度相当,铝合金腕臂挠度稍大,材质不同是造成腕臂刚度不同的主要原因,和腕臂结构关系不大;腕臂支撑处应力较小,可以适当减小,但需要考虑压杆稳定性。3.基于对安全性、简便性、稳定性、匹配性和环境适应性等方面的综合考虑,制定了新型腕臂定位装置的设计原则;并在设计原则指导下,根据其具体功能需要、结构型式、连接方式、型材截面型式、承力索固定方式,初步设计了三种新形式的腕臂定位装置方案。利用ANSYS对三种方案进行校验,发现所提出的几种方案在应力和应变方面都符合要求,且裕量较大。最后从技术合理性、经济性、感观适宜性几方面综合考虑分析后,推荐了一种新型腕臂定位装置方案。更多还原

【Abstract】 In the systems of electrified railway,the overhead contact system(OCS)plays the important role in providing the energy for the whole high-speed train.The electrical energy required for the running of the train is obtained by the sliding electric contact between the pantograph on the top of the train and the contact line of the OCS.The electric contact performance between the pantograph and OCS(hereinafter referred to as the pantograph-OCS)and the service status of the OCS devices directly affect the current-receiving quality,stability and safety of the pantograph,which finally determine the running speed and safety of the train.Given all these factors,the raise of the scheme of unified OCS parameter configuration which can improve the electric contact performance of pantograph-OCS,and the scheme of cantilever,positioning device with new structure which can adapt to the requirements of OCS in the new era are of significant importance.It is with practical guiding significance for the design of OCS of high-speed railway.After considering the widespread research results,the current specification and the basic theory of pantograph-OCS,the 350 km/h level and the 400 km/h level optimized scheme of the high-speed railway OCS parameter configuration was proposed.In this paper,the advantages and disadvantages of the structure of cantilever,positioning device of the existing OCS were analyzed,and three kinds of structures of cantilever,positioning device were designed.Finally,the optimal recommendation scheme of the new cantilever,positioning device was put forward after comprehensive consideration.The main conclusions of this paper are as follows:1.The evaluation parameters of the system parameters configuration were selected according to pantograph-OCS theory,current specification and research results from inland and abroad,including static elastic inhomogeneity,contact force,off-line rate,wave propagation speed of contact line,enhancement factor,doppler factor and reflection factor.Based on these evaluation parameters,recommended configuration scheme of OCS parameters of 350 km/h level railway were proposed taking into account of several key parameters.Eventually,the optimized configuration scheme was obtained by further analysis of the aspect of the system security margin,equipment support and the actual application.Besides,the best configuration scheme of OCS parameters of 400 km/h level was obtained by the same methods.2.The structure of cantilever,positioning device of the existing OCS system were analyzed by utilizing ABAQUS software.It was found that all the structures met the deflection requirements from the railway standard under loading,that the deflections of the three kinds of steel cantilevers were similar,the deflection of the cantilever of the aluminum alloy was slightly larger than others,which was attributed to the difference of the cantilever material.And the stress of the support of cantilever could be appropriately reduced after considering the stability of the strut was relatively small.3.The design principles of the new cantilever,positioning device was formulated by the comprehensive consideration of safety,simplicity,stability,matching and environmental adaptability.Under the guidance of the design principles,three kinds of new cantilever,positioning device were designed according to the specific functional requirements,structural style,connection type,type of material section,fixture type of the messenger wire.The schemes were checked by using the ANSYS software,in terms of stress and strain,all the schemes were conform to the requirements,and the margin was big.After the comprehensive consideration of technical rationality,economy,sensory suitability,one project of new cantilever positioning device was proposed.更多还原