Abstract
The vibration data of the gearbox on a high-speed train was measured, and the vibration characteristics were analyzed in this paper. The dynamic stress of the gearbox under the internal and external excitation was examined by a railway vehicle dynamic model with a flexible gearbox and a flexible wheelset. The ideal 20th polygonal wear was considered, and dynamic stresses of the gearbox under different polygonal wear amplitudes were calculated. The gear transmission model was established to study the dynamic stress of the gearbox under the influence of the time-varying stiffness of the gear meshing. Based on the rigid–flexible coupling model, and considering the influence of wheel polygonization, gear meshing time-varying stiffness, and wheelset elastic deformation, the dynamic stress of the gearbox was investigated with consideration of the measured polygonal wear and measured rail excitation. The results show that the dynamic stress of the gearbox is dominated by the wheel polygonization. Moreover, not only the wheel polygonization excites the resonance of the gearbox, but also the flexible deformation of the wheelset leads to the deformation of the gearbox, which also increases the dynamic stress of the gearbox. Within the resonant bandwidth of the frequency, the amplitude of the dynamic stresses in the gearbox will increase considerably compared with the normal case.
Highlights
As a critical component of a high-speed train mechanical traction drive system, the primary function of the gearbox is to transmit the power of the motor to the wheelset
It is of great engineering significance to study the dynamic response of the gearbox under the complicated internal and external excitation
This paper analyzes the vibration acceleration data of the measured gearbox, divides the main frequencies of the gearbox vibration according to the forced vibration and resonance characteristics, and investigates the causes of each main frequency vibration
Summary
As a critical component of a high-speed train mechanical traction drive system, the primary function of the gearbox is to transmit the power of the motor to the wheelset. Installation errors, and wear and tear, rigid shocks are generated between the wheels and tracks when the vehicle is running, which is the main source of excitation for high-speed train gearboxes. The internal excitation is caused by the time-varying stiffness of the gear meshing [13] It can be seen from the above analysis that the gearbox on the railway vehicle is in a nonlinear system with multi-input and high-frequency coupling. The gearbox and the wheelset were considered as flexible bodies, a rigid–flexible coupling model was established Based on this model, the excitation sources inside and outside the gearboxes were analyzed, respectively, and the influence of each excitation source on the dynamic stress of the gearbox housing was studied. The typical high-speed train model of China was established in this study, as shown, which is composed of a car body, two bogies, and four wheelsets.
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