| 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. |
PDF Full Text Request