Full parametric calculation method for anti-rail turnover performance of low vibration track
The fastener and elastic support block may increase the rail overturn angle and the rail head lateral displacement,when the train passes through the elastic support block ballast-less track,which could affect the safety and stability of the train operation.In this paper,the wheel-rail interaction relationship(including wheel-rail vertical force and its action position,wheel-rail horizontal force and its action position,rail profile,etc.),the mechanical and geometric parameters of the fastening system,and the mechanical and geometric parameters of the elastic support block were considered comprehensively.The mechanical and geometric model were established accurately,which comprehensively and clearly represented the mechanical characteristics of the elastic support block ballast-less track structure.Based on the principle of moment calculation,a fully parametric calculation method for the anti-overturning performance of the elastic support block ballast-less track rail was constructed.Combined with the residual deformation experiment of the single-node full-scale model,the calculation results were in a good agreement with the single-node full-scale model experimental results and the solid finite element model simulation results.Based on the calculation principle of moment balance,a fully parametric calculation method was proposed for the anti-overturning performance of the elastic support block type ballast-less rail track.The theoretical calculation results were revised according to the residual deformation test of the single-node full-size model.The theoretical calculation value of the expansion of the support block spacing was increased by 0.04 mm to correct when the influence of the initial assembly gap was eliminated.The gauge extension should be increased by 0.2 mm to be corrected.By comparing and analyzing the calculation results,the test results of single-node full-size model and the simulation results of traditional solid finite element model,it is proved that the data agreed satisfactorily.The conclusion shows that the analysis of multi-parameter sensitivity can be carried out efficiently and accurately by using this method,which provides the design basis for the optimization of the structure and components of the elastically supported block ballast-less track under different operation conditions.
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