Research On Real-time Monitoring System Of Bearing Health Status Of High-speed Train

As the main force of Chinese postcards and intercity transportation,high-speed railway has been injecting new vitality into China’s social and economic development while enhancing our international influence.Safety is the precondition of speeding up the train.With the accumulation of train mileage in China,the overall safety and reliability test of high-speed trains have put forward higher requirements.Bearing is one of the important components of high speed train bogie.The detection and study of its running state can not only prevent catastrophic accidents caused by sudden faults and guarantee the normal operation of trains,but also prevent the gradual faults and effectively improve the maintenance method of highspeed train bearings.Taking high-speed train gearbox bearings as the research object,this paper analyzes and sorts out the types,installation positions,operating conditions,failure modes,vibration mechanism and sources of bogie bearings.Based on the analysis of the existing diagnostic technology and domestic research status,the fault diagnosis method based on vibration signal is explored,and the fault feature extraction method is mainly studied.Based on this,the timedomain analysis is established to quickly analyze the vibration signal through the characteristic value and probability density coefficient.On the basis of wavelet denoising,the vibration signal is analyzed in frequency domain by combining with the characteristic frequency,and then the signal is extracted and analyzed in time and frequency domain by means of wavelet packet decomposition,standardized entropy,hilbert huang transform and correlation analysis.After that,the above methods are analyzed and verified by the fault data of the Bearing Data Center of Western Reserve University,so as to ensure the stability and effectiveness of the method.The research of fault diagnosis method based on vibration signal,the portable prototype of high-speed train bearing safety detection system is designed and implemented.Through the analysis and investigation of vibration sensor and the vibration analysis of gearbox bearing,the design and integration of system hardware such as sensor,signal acquisition card and industrial control computer are carried out.Whereafter,the requirements of the monitoring system were analyzed,and the functional modules were divided into signal acquisition module,time-domain analysis module,frequency-domain analysis module,time-frequency analysis module and rapid diagnosis module.The design and implementation of each functional module were carried out to complete the construction of portable vibration monitoring platform.In the embodiment,based on the running-together test platform factory of CRRC,three sets of test data of the gear box’s active end and driven end were analyzed in time domain.Then the signal is analyzed in frequency domain and time and frequency domain on the basis of fast analysis by wavelet denoising,and the running state of gearbox bearing is further analyzed.Finally,the system is improved and optimized on the basis of the analysis of gear box bearing running-and-closing test.