Dynamic Characteristic Analysis of Racked Railway Vehicle-track Coupling System with Considering the Dynamic Excitation of Gear-rack Transmission

doi:10.3901/JME.2023.08.163

Abstract

Abstract: Based on the theory of vehicle-track coupled dynamics and gear system dynamics, a complete racked railway vehicle-track coupled dynamics model which considers the dynamic excitation from the gear-rack mesh is established.Especially, the analytical calculation method of the gear-rack mesh stiffness is proposed based on potential energy principle,and the received results are compared with the calculation results from models using the 225 force element in Simpack and the finite element method, respectively. The results show that the proposed method has good accuracy and efficiency. Based on the established model, the dynamic characteristics of the gear-rack mesh force, gear angular acceleration, wheel-rail vertical force and car body acceleration are analyzed. At the same time, influence of the rack flexibility on the dynamic response of the racked railway system is investigated, and the influence law of the slope gradient and vehicle operation speed is also revealed. The results indicate that the finite element method and the proposed analytical method can reflect the influence of the rack flexible deformation on the system dynamic response characteristics at low frequency range. And the dynamic responses such as the gear-rack mesh force and the angular accelerations increase with the growth of slope gradient or the vehicle running speed. Besides, the root mean square of the wheel-rail vertical force and lateral force also increases with the vehicle running speed. It can be also observed that in the speed range of 10-35 km/h analyzed, the derailment coefficient of each wheelset is less than 0.8(allowable limit), and the vertical and lateral sperling indexes of the car body are less than 2.5(excellent), which meet the requirements of relevant standards for driving safety and stability.

Key words: racked railway train, gear-rack transmission, dynamic analysis, time-varying mesh stiffness, axle load transfer

CLC Number:

U234

CHEN Zai-gang, TANG Liang, YANG Ji-zhong, CHEN Zhi-hui, ZHAI Wan-ming. Dynamic Characteristic Analysis of Racked Railway Vehicle-track Coupling System with Considering the Dynamic Excitation of Gear-rack Transmission[J]. Journal of Mechanical Engineering, 2023, 59(8): 163-173.

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