High-speed Train Wheel-rail Profile Alignment And Vehicle Modal Analysis

As the measured wheel and rail surface(wheel-rail surface)reference coordinate system will be subject to a variety of factors and is different of the theoretical coordinate system,it is necessary to the measured wheel-rail surface coordinate transformation,with the standard coordinate system Alignment and contrast analysis.It is proposed to apply the method of ICP algorithm,and compared with the traditional five kinds of alignment methods.The analysis shows that the linear alignment of the ICP algorithm is better than the traditional method,can more accurately calculate the wheel and rail wear.When the measurement reference coordinates are shifted and rotated,the traditional method will no longer apply,and the ICP algorithm will still be effective,and this method can be applied to the on-line monitoring of the wheel-rail surface.China's high-speed EMU in the line operation,the occurrence of 1.0?2.5Hz within the body of the phenomenon of rocking,which is because in some boundary conditions,the body of the suspension mode and the meandering mode coupled with a meandering,Vehicle performance has a great impact.The frequency,damping ratio and vibration mode of suspension mode and meandering mode are studied by establishing classical bogie and vehicle lateral dynamic model,and the phenomenon of cross coupling coupling of vehicle suspension mode and meandering mode is analyzed.The influence of parameters on vehicle mode is studied by parametric analysis.Major jobs:(1)The ICP algorithm is applied to the alignment of the wheel and rail surface.The comparison shows that the method of line alignment is superior to the traditional point alignment method.(2)The relationship between the eigenvalues and the eigenvectors and the modal parameters is analyzed.The continuity of the modes is studied by means of velocity tracing and eigenvalue velocity tracing respectively.(3)Based on the dynamic sensitivity analysis and univariate analysis of suspension parameters,the modal frequency of the bogie is analyzed and it is found that the positioning stiffness is the most important influence factor.The modal analysis of the bogie through the multivariate parameters shows that there is only a steady state of the unsteady vibration when there is only a small positioning stiffness and a small damping.Otherwise,there are only two permanent failure modes.(4)A 17-DOF vehicle transverse model was established.The phenomenon of cross-coupling between the meandering mode and the body shape of the bogie was analyzed.It was found that under the specific conditions,when the suspension mode of the vehicle crossed the frequency of the meandering mode,the two modes Conversion,and this state often corresponds to the vehicle's a snake.Through the parametric analysis,the influence of the parameters on the three modes of the vehicle body is obtained.