Design And Optimization Of High Speed Rail Closed Belt Grinding Vehicle Based On Virtual Prototype

Rail grinding is one of the key technologies to improve relationship between wheel and rail.It can improve the stability,safety and transportation-capacity of the train,It has been playing more and more important role in railway system.But with the development of high-speed railway,rail grinding technology forced towards high efficiency,high quality,environmental protection and other aspects of economic diversification;compared with the traditional rail grinding,abrasive belt grinding has a flexible contact with rail,it is not easy to damage,it has high polishing efficiency,easy recovery,environmental protection and other debris advantages.In recent years,the research and application about rail belt grinding technology have been started at home and abroad,but there is no rail abrasive belt grinding device for high-speed rail.This thesis,the virtual prototyping technology is used to design the steel belt abrasive device,and the structure is optimized based on the analysis results.The main contents are as follows:First of all,the analysis of rail grinding based on the assembly technology,high-speed rail profile,rail wave,determine the envelope scheme,abrasive belt grinding of rail grinding unit arrangement,grinding parameters such as number of units;and based on analysis of the existing rail grinding mechanism,realize the function range of grinding movement the composition,size and other aspects of the grinding trolley,to complete the three-dimensional modeling of polishing car;then analyzes the grinding motion space,structure size check car realizes grinding,preliminary optimization of the car on a rail belt,the polishing trolley satisfied by moving,deflection,pressure three movement combination and realize the function requirements of grinding.Then,the components of the important bearing force of the grinding car are analyzed,which mainly include the linear guide support frame,the grinding head frame,the tension floor,the guide wheel train and the row contact wheel assembly.The ANSYS Workbench software is used to carry on the static analysis of the important parts Based on the analysis results,the parts with large deformation are further optimized,and the total displacement of the optimized parts is verified,and the results are analyzed.The results show that the deformation and displacement of the components are analyzed.Show that the optimized parts can better meet the static requirements.Next,the ANSYS Workbench software is used to analyze the important components,including the grinding head frame,the tensioning floor,the grinding unit.substrate,the guided wheel train and the row contact wheel assembly.The first 6 order modes of the important components are analyzed,The frequency of its active frequency and a high-speed rail operation of the excitation frequency of the comparison,for the frequency close to the important components to optimize,and the optimized structure of the modal frequency and static strength were verified,verified after:After the structure to improve their own static,dynamic characteristics,making them better meet the predetermined requirements.Finally,combined with the above analysis of the grinding car model;model is established by Simpack and it's a dynamics model;model is analyzed in different lines and different grinding modes,A and B type self-propelled car in grinding and polishing the dynamics performance of the operating condition,the main analysis of dynamic mechanical properties include Y and Z direction acceleration,wheelset lateral force and derailment coefficient,the analysis of rail vehicle dynamics index with the results of GB/T17426-1998 in comparison,the final results show that the dynamic performance of the rail car with the design standard of abrasive belt grinding.