| Bogie structural vibration is one of the main sources of high-speed train vibration.Compared with the traditional ordinary train,the high-speed wheel-rail excitation frequency is higher.When high-frequency vibration is transmitted to the bogie,local abnormal vibration may also cause structural fatigue of related parts and reduce their service life.The high-frequency vibration is further transmitted to the car body through the bogie,which intensifies the noise problem of high-speed trains and affects riding comfort.The influence of high-frequency vibration of bogie system on the driving safety and riding experience of high-speed trains cannot be ignored,and its high-frequency vibration transmission characteristics need urgent attention.In this paper,the high-frequency vibration finite element analysis model of bogie system was established,the high-frequency vibration transmission characteristics in the whole bogie system were studied,the influence of high-frequency vibration transmission characteristics and material parameters of key suspension components under different transmission paths were preliminarily explored,and the measures for controlling the high-frequency vibration of bogie were analyzed.The research results are of great significance for mastering and optimizing the high-frequency vibration characteristics of high-speed train bogie systems.The main work and conclusions of this paper are as follows:(1)Based on the three-dimensional laser vibrometer,the modal characteristics of the frame at medium and high frequencies,especially the vibration characteristics of the local structure of the frame,were tested.Based on the finite element method,the finite element modal analysis model of the frame was established.The results show that the predicted mode shapes and modal frequencies are in good agreement with the above test results(the maximum error of modal frequencies is 4.6%).(2)The high frequency vibration transmission characteristics of primary and secondary key suspension components,including a series of vertical shock absorbers,a series of inner and outer ring steel springs,swivel arm joints and traction rods,were tested.Based on the finite element method,considering the structural vibration of the suspension components,the finite element model for high frequency vibration analysis of the suspension components was established.The data comparison shows that the transfer function predicted by the suspension components simulation model is basically consistent with the test results.(3)Based on the research of the finite element model for high-frequency analysis of frame and suspension components,a high-frequency vibration transmission characteristic analysis model of bogie system was established with finite element method.The analysis frequency range is 0~1000 Hz.In the model,the flexible modes of wheel pair,axle box,frame,bolster and structural vibration of suspension components were considered.The local transfer function under the assembly state and the measured point response under the stable operation state of the same type bogie were tested,and the comparison with the prediction results shows that the prediction results of the simulation model are basically consistent with the test results.(4)Based on the above bogie system model,the transfer function and contribution under different transfer paths were calculated.The results of vibration transmission characteristics and contribution of different transmission paths in the primary suspension of bogie system show that the vibration transmission effect of the primary vertical shock absorber path is mainly reflected in two high frequency bands of 620~675Hz and 955~980Hz.The steel spring path mainly transmits high frequency vibration of 500~1000Hz.Vibration less than 290 Hz on the rotating arm path has better attenuation,and the transmission rate in the middle and high frequency bands of 290~970Hz is larger.In comparison,the most significant vibration transmission on the first system path is the rotating arm path.The prediction results in the secondary suspension show that the vibration transmission effect on the path of the secondary lateral shock absorber is mainly reflected in the middle frequency band around 300 Hz and the high frequency bands of 555 Hz and 700~770Hz,with prominent but not dense peaks and good overall attenuation.The middle frequency band of 305~415Hz is the main vibration transmission frequency band on the path of the secondary vertical shock absorber,and the high frequency bands around 555 Hz and 745 Hz also have large transmission,and the low frequency attenuation below 305 Hz is good.The transmission effect of anti-hunting shock absorber is the most significant around 300 Hz,700Hz,745 Hz and 970 Hz,with prominent peaks but discontinuous distribution.The traction rod has dense peaks in the middle and high frequency bands of 500~849Hz.The main frequency bands of anti-roll torsion bar path vibration transmission are 200~449Hz and 740~976Hz.In comparison,the most significant vibration transmission in the secondary path is the anti-roll torsion bar path.(5)In order to optimize the high-frequency vibration transmission characteristics of the transmission path,parameter optimization was carried out for the rotating arm path and the anti-roll torsion bar path,which have the most significant contribution to the vibration transmission of the primary and secondary paths,including the rubber parameters of the rotating arm node and the rubber parameters of the anti-roll torsion bar node.The results show that,within the allowable range of dynamic performance,reducing the elastic modulus and increasing the damping ratio of the rubber material at the joint of the rotating arm and the side rolling torsion bar can effectively reduce the corresponding vibration transmission. |
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