During the operation of high-speed trains,the loads on the gearbox are very complex,and cracks often occur in the box-body.To ensure the service safety of the gearbox body,a dynamic model of high-speed trains with a gear transmission system was estab-lished based on SIMPACK.Comparative analysis of the vibration response of the gearbox rigid body at speeds of 200 km/h,250 km/h,300 km/h and 350 km/h was conducted,considering only track excitation and both gears internal excitation and track excitation.In addi-tion,a rigid-flexible coupling dynamic model of a high-speed train considering a flexible gearbox body was established to analyze its im-pact on the vibration calculation results of the gearbox body.The results indicate that the internal excitation of the gearbox has a little im-pact on the lateral vibration acceleration of the gearbox body,but at the rotational frequency of the driving gear and the engagement fre-quency of the gears,the vertical vibration acceleration of the gearbox body will exhibit a peak value,which significantly increases its root mean square value,with an average increment of 4.8 m/s2.At a speed of 200 km/h,the resonance is caused by the similarity between the rotational frequency of the driving gear and the modal frequency of the gearbox pitching,resulting in a very significant increase in the root mean square value of the vertical vibration acceleration of the gearbox body.Therefore,when analyzing the vibration of the gear-box body,the internal excitation of the gearbox cannot be ignored.The flexibility of the gearbox body has a little impact on the lateral vi-bration acceleration of the gearbox body when considering the internal excitation,but it will reduce the root mean square value of the ver-tical vibration acceleration to some extent.The average reduction after the speed reaches 300 km/h is large,reaching 2.72 m/s2.
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