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ÎÄÕ±àºÅ£º1006-0316 (2023) 03-0027-07

Effects of Harmonic Torque on Dynamic Characteristics of Locomotive Transmission System

JIN Xiao1£¬LIU Lin1£¬HUANG Shan1£¬ZHOU Ziwei2

( 1.National Innovation Center of High Speed Train, Qingdao 266111, China;2.State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China )

Abstract£ºThe harmonic torque of traction motor has a vital effect on dynamic load, vibration noise and other dynamic characteristics of the locomotive transmission system which is composed of traction motor, gear transmission, wheel-rail contact, etc. In this paper, based on the structure parameters and functional characteristics of the traction motor of an AC electric locomotive in China, a vehicle-track vertical-longitudinal coupled dynamics model considering the dynamic meshing of gear transmission system is established. And by using the void displacement principle, the ripple harmonic torque is calculated and input into the established coupled model as an excitation to explore the effect law on the dynamic characteristics of locomotive transmission system. The results show that the harmonic torque will aggravate the fluctuation amplitude of the dynamic mesh force and dynamic transmission error, which results in more fluctuation of the dynamic interaction between the wheels and the rail, while the RMS value of wheel-rail adhesion coefficient on the load increment wheelset is less than the load reduction wheelset under the effect of the axle load transfer. In addition, the load increment wheelset is less affected by the harmonic torque, while the load reduction wheelset is more affected by the harmonic torque.

Key words£ºrailway locomotive£»gear transmission£»void displacement principle£»harmonic torque£»adhesion coefficient

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