Design And Research On The Test Rig Of High-speed Railway Rolling Bearings

In recent years,the high-speed rail diplomacy,as the new words frequently appear in people’s vision,high-speed railway train almost become synonymous with china.With the continuous localization of high-speed rail industry,China has mastered a series of high-speed rail core technology.But as important walking support for the high-speed railway vehicles,the localization of axle box bearing has not been achieved.SKF,FAG,NTN and other veteran bearing manufacturers firmly occupy the Chinese rail vehicle bearing market.Axle box bearing,the "small and important" short board,has become a stumbling block to the development of China’s high-speed rail.Localization of axle box bearing need to experience a relatively lengthy process,in this process needs a lot of firsthand data as necessary technical support.There is a great deal of data source come from real train test,and the other needed by the bearing test bench.Therefore,it is very meaningful to develop the test-bed which can test the comprehensive performance of axle box bearing.This paper aims to develop a test bench to test the performance of high-speed train axle bearings,by simulating the actual operation condition of high speed train axle box bearings,monitoring the vibration and temperature of the bearing.Concrete research content is as follows.Based on the actual needs of the bearing test rig,combining the development experience of domestic and foreign existing bearing test rig,to complete the design of the test bench.On the basis of determining the composition and interrelationship of the test bed system,the technical parameters of the test bench are developed.Using Solid Works to complete the 3D solid modeling of the test bench,and to determine the overall layout of the test bench.According to the system composition and the matching relationship of the test bench,the equipment selection and design calculation of each system are completed.As the main body of the test bed needs to complete the high speed,heavy load and high frequency vibration operating conditions,the test bed main body parts,especially the key parts of the main structure is put forward higher structural strength requirement.Therefore,this paper uses finite element analysis theory,respectively,using Hyper Mesh and ANSYS as pre-processing software and post-processing software,the strength analysis was carried out on the test rig key parts.In addition,in order to avoid the resonance of the test bed during high frequency vibration,the modal analysis of the relevant structure is carried out using ANSYS.The natural frequency of the bearing system is obtained by modal analysis,which provides the basis for the vibration control.Based on the results of ADAMS and finite element meshing,the model of rigid-flexible mixed multi-body dynamics was established.The relationship between the dimension parameters and the dimensionless parameters and the running conditions and bearing performance was obtained by comparing the simulation results.Compared with the measured data from the railway vehicle,the feasibility of the high-speed bearing test rig is verified from the dynamic point.It is designed for the measurement and control system of the test bed.After determining the composition and function of the measurement and control system,I/O port statistics,PLC selection and sensor selection are completed.The serial communication between the measurement and control system is established based on Lab VIEW,and the data acquisition and monitoring design is completed.