Research on the Influence of Seamless Rack on the Lateral Stability of the Rack Railway
Research purposes:The traditional rack railway adopts a jointed rack,which has a high requirement for the deformation of the lower foundation,and is easy to increase the vehicle vibration and increase the maintenance cost,for this reason,a seamless rack railway is proposed.To investigate the effect of the seamless rack on the lateral stability of a rack railway,considering the seamless rack,an analytical model of lateral stability of a rack railway was established by finite element software,and the permissible temperature rise of continuous welded rail(CWR)of rack railway was investigated under the factors of with or without rack,seamless rack type,line gradient,initial bending wavelength and bending vector,lateral resistance of the rack railway ballast and curve radius.Research conclusions:(1)The seamless rack will reduce the lateral stability of the CWR of rack railway compared with the traditional CWR,and the larger the cross-sectional area of the rack,the smaller the permissible temperature rise of the rail,it is recommended that the seamless rack is manufactured based on the 50 kg/m rail.(2)The permissible temperature rise of rail for CWR of rack railway decreases with the increase of line gradient and increases with the increase of curve radius and the lateral resistance of the rack railway ballast.(3)The permissible temperature rises of rail for CWR of rack railway decrease with the increase of the initial bending vector,and with the increase of the initial bending wavelength,the permissible temperature rise of rail for CWR of rack railway decreases first and then increases,the most unfavorable bending wavelength is about 5 m.(4)In order to ensure the lateral stability of CWR of rack railway,it is recommended to adopt measures such as using small cross-section racks,increasing curve radius and lateral resistance of the rack railway ballast,avoiding the most unfavorable initial bending wavelength and the bending vector.(5)The research results could provide a reference for the design of continuous welded rail of rack railway.
seamless rackrack railwayfinite element analysislateral stabilitypermissible temperature
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