Analysis Of Vibration And Noise Of A Rail Gearbox

The adoption of urban rail vehicle in the progress of social and economic development of domestic cities demands a better system design. With stable transmission ratio, smooth transmission and large bearing capacity,100% low floor gearbox is an important and common transmission device for rail transit systems. During the drive process, the gearbox bears great load,deformation and stress, and makes vibration noise in the gear with internal incentives. As the distance between the floor and the device is between 35-38 centimeters that the low-floor gearbox system has to be arranged on the sides of the bogie. This requires a new design of the gearbox with improved reliability, bearing capacity and less noise.In this paper, the performance of a 100% low-floor gearbox system was evaluated with finite element analysis and dynamic simulation method for its multi-flexible body dynamic response and structure noise. The corresponding results were used to optimize the design. The main works are as follows:1. Firstly, the main components of the gearbox were simplified according to the characteristics of various components of the low-floor gearbox system such as gear shaft, body and cover. The documents needed to generate flexible-body were generated by mesh generation and substructure analysis in ABAQUS.2. Based on the documents obtained from substructure analysis using ABAQUS, the flexible-body dynamics model of the low-floor gearbox was built in SIMPACK. The potential resonance point of the low-floor gearbox was identified by the static balance, dynamic balance and offline feature frequency analysis.3. By dynamic response analysis, the kinematic parameter and the deformation of the gearbox were obtained. The frequency response curve was made with FFT method. Based on the results, the gearbox in the frequency domain was evaluated.4. Using the SIMPACK post-processing module, values of 1/3 octave structure noise on selected points of all directions were calculated. Moreover, optimization schemes were proposed to improve the structure noise of low-floor gearbox, system gear modification and structure improvement.5. The research results of this project were summarized, we also prospects the work of the next stage.