Research On Dynamic Simulation Analysis And Vibration Control Of Rail Grinding Vehicle By Abrasive Belt

Rail grinding technology can effectively improve the wheel-rail contact relationship,inhibit rolling contact fatigue,extend the service life of rails,improve the stability and safety of train operation,and ensure the transportation capacity of railways,thus playing an important role in the maintenance of railway lines.With the rapid development of my country’s railways,rail grinding technology and equipment are developing in the direction of high efficiency,high quality,intelligence,and diversification.The belt-type rail grinding vehicle independently developed by our school has the advantages of light weight,flexibility,high integration,energy saving and environmental protection.It is of great significance for the development of diversified rail grinding equipment and improving grinding efficiency.In order to improve the rail grinding quality and the structural reliability of the grinding Vehicle,and reduce the vibration and noise of the rail grinding Vehicle,this paper conducts a dynamic simulation analysis on the belt-type rail grinding Vehicle and conducts research on the vibration control scheme.The main research contents are as follows:According to the design requirements of the belt-type rail grinding vehicle,the internal and external excitation sources in the actual operation of the grinding vehicle are studied,and the rail corrugation excitation,wheel out-of-round excitation,belt grinding excitation and driving wheel eccentric inertial force excitation are mainly analyzed.The law of action and frequency domain characteristics.According to the three-dimensional solid assembly model of the polishing Vehicle,a finite element analysis model containing key components such as the wheel set,the underframe,the frame,and the polishing unit is established.Simulate the actual bolt hole position and the installation state at the welding position to constrain each component,and perform modal analysis to obtain the inherent characteristics of the whole vehicle and each component,determine the middle of the underframe,the main beam of the frame,the wheel-set axle,and the polishing Resonance occurs when the unit moves the support frame vertically.According to the actual acting position of the excitation source,each excitation source is individually loaded into the finite element model for frequency response analysis.The vibration characteristics of the whole vehicle at different frequencies are obtained,and the total average energy and vibration contribution degree under each single excitation are obtained by calculating the curve energy,and the excitation source with the greatest influence is determined to be the rail corrugation excitation and the overall vibration The amplitude gradually becomes larger as the frequency of the excitation source increases.Excitation sources were applied according to non-operating working conditions,symmetrical polishing operating conditions and asymmetrical polishing operating conditions,and the transient response analysis of the entire vehicle under the combined action of multiple excitations was carried out,and the vibration characteristics and vibration intensity distribution of the entire vehicle were analyzed.Make predictions and use the method of calculating the root mean square to evaluate the vibration response in the time domain.The results show that the vibration conditions of the grinding Vehicle are different under different working conditions,and the vertical vibration acceleration of the Vehicle body under the non-operating working condition and the grinding working condition does not meet the requirements of the GB/T 17426-1998 standard The limit value.According to the analysis results of the above-mentioned dynamic simulation,combined with the design requirements,the vibration control of the resonance and severe vibration parts of the belt-type rail grinding Vehicle was studied by adding vibration isolation elements,modifying the structure,and damping vibration.The improved vibration of the sanding Vehicle.The results show that the rms value of the vibration acceleration of the whole vehicle after the improvement is reduced by about 55%,indicating that the vibration control scheme can effectively reduce the vibration of the grinding vehicle.Moreover,the vibration acceleration of the vehicle body under the nonoperating conditions and the grinding operating conditions both meet the limit value specified in the GB/T 17426-1998 standard,indicating that the effect of vehicle vibration control meets the standard stability requirements.