Abstract
The traction motor is the power source of the locomotive. If the surface waviness occurs on the races of the motor bearing, it will cause abnormal vibration and noise, accelerate fatigue and wear, and seriously affect the stability and safety of the traction power transmission. In this paper, an excitation model coupling the time-varying displacement and contact stiffness excitations is adopted to investigate the effect of the surface waviness of the motor bearing on the traction motor under the excitation from the locomotive-track coupled system. The detailed mechanical power transmission path and the internal/external excitations (e.g., wheel–rail interaction, gear mesh, and internal interactions of the rolling bearing) of the locomotive are comprehensively considered to provide accurate dynamic loads for the traction motor. Effects of the wavenumber and amplitude of the surface waviness on the traction motor and its neighbor components of the locomotive are investigated. The results indicate that controlling the amplitude of the waviness and avoiding the wavenumber being an integer multiple of the number of the rollers are helpful for reducing the abnormal vibration and noise of the traction motor.
Highlights
The powerful electric locomotive has become an inevitable choice for meeting the demands of high-speed passenger and heavy-haul freight transportation in the rail transit industry
An excitation model coupling the time-varying displacement and contact stiffness excitations is adopted to investigate the effect of the surface waviness of the motor bearing on the traction motor under the excitation from the locomotive-track coupled system
The results indicate that controlling the amplitude of the waviness and avoiding the wavenumber being an integer multiple of the number of the rollers are helpful for reducing the abnormal vibration and noise of the traction motor
Summary
The powerful electric locomotive has become an inevitable choice for meeting the demands of high-speed passenger and heavy-haul freight transportation in the rail transit industry. Wang et al [22] and Liu et al [23] further expanded the degrees of freedom of the model in the lateral direction and established the vehicle–track spatially coupled dynamics model with gear transmissions for the high-speed train and the locomotive, respectively These works provide a good theoretical foundation for the modeling of the locomotive– track system and are helpful to simulate the actual working conditions of the traction motor in a locomotive with intensified vibrations excited by the track random irregularity and the time-varying mesh forces from the gear transmission. Interactions between the components of the rolling bearing (e.g., roller–race/cage/ribs contact forces and the corresponding friction forces) and the time-varying displacement and contact stiffness induced by the surface waviness are comprehensively considered in the dynamics model of the rolling bearing Using this coupled dynamics model, more accurate vibration responses of the traction motor under the effect of the surface waviness in the motor bearing and the track random irregularity can be extracted from the dynamic simulations.
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