Abstract
Gearbox, as the crucial transmission equipment of high-speed train drive system, bears mainly the impact of wheel-rail excitation during its application, resulting in fatigue failure of the housing structure. In order to analyze the vibration characteristics of the high-speed train gearbox housing, a test had been performed under operating condition on Wuhan-Guangzhou High-Speed Railway, where a host of vibration characteristics of different parts of housing had been obtained, and vibration signals had also been comparatively analyzed using acceleration amplitude spectrum and equivalent acceleration amplitude method. The result showed that the vibration level of the measuring point A on the joint part of the gearbox housing and axle bearing block was higher than that of the measuring point B on the upper part of the gearbox housing, both horizontally and vertically. And there existed attenuation during the transmission process of vibration from point A to Point B. Further, when a train was moving at a high speed, the gearbox vibration at the head carriage was better than that at the tail carriage. In addition, when a train slowed down from 300 km/h to 200 km/h, the horizontal equivalent acceleration amplitude dropped by 58% while the vertical one declined by 62%. Equivalent acceleration amplitude method was used to identify the vibration relations among different parts of housing, and the validity and applicability of this method were verified by data analysis. The study provided reference to ensure the operating safety of high-speed train drive system and design of new housing structure.
Highlights
Due to its high speed, large transport capacity, low energy consumption, light pollution, less land occupation, high safety performance and other technical and economic advantages, the high-speed rail has attracted universal attention from countries all over the world
As the crucial component of the drive system of high-speed train, the gearbox takes the impact of the wheel-rail excitation when the train is running at high speed
2) By performing line test, maximum acceleration and main vibrating frequency at different measuring points of the gearbox when the high-speed train was running along the Wuhan-Guangzhou Railway were obtained
Summary
Due to its high speed, large transport capacity, low energy consumption, light pollution, less land occupation, high safety performance and other technical and economic advantages, the high-speed rail has attracted universal attention from countries all over the world. Reference [6] involves an in-depth exploration of the vibration characteristics and the frequency distribution of high-speed train, based on test data collected on the Wuhan-Guangzhou Railway, which shows that the main vibration frequency of the wheel-rail excitation is within 400 - 600 Hz. Reference [7] involves a simulation analysis where dynamic responses of the gearbox housing of high-speed train under internal and external excitation are studied, and frequency of the harmonic torque of the asynchronous motor and the gear-mesh frequency are considered, with the vibration characteristics of the gearbox housing under wheel-rail excitation remaining to be further investigated. Spectrum analysis of the vibration responses is performed by applying the data processing software independently developed by the structural strength testing laboratory of Beijing Jiaotong University, based on the vibration response signals of the high-speed period which is selected randomly and the analysis of its frequency characteristics, the vibration relationship among different parts of gearbox housing is explored by defining the equivalent acceleration amplitude, and analysis and validation are carried out based on the line data
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