Research On Technology Of Performance Analysis And Improvement Of The Noise-reducing Wheel Damper

Rail transit including inter-city fast train,Skytrain and subway which is within thecity has a very obvious advantages compared with other forms of transport, such aslarge volume, small footprint and less pollution. However, It brings more and moreserious noise pollution and great negative impact on people’s living and production asRail transit speed becomes faster. Wheel-rail noise is a very prominent type in railtransit noise. This paper is to study how to use the wheel dampers to reduce wheel-railnoise problems of rail transit.Establish finite element model of the wheel to carry on modal analysis usingANSYS software, and then get natural frequencies and mode shapes of the wheel. Theresult that radial vibration mode of tread and axial vibration mode of wheel plate are themain vibration mode during0~5000Hz can be obtained through this analysis. Therefore,a good vibration reduction effect can be obtained after mounting wheel damper on thewheel to mainly control the vibration of tread and wheel plate. Do the modal tests of thewheel with and without wheel damper to get natural frequency and modal damping ratioof the two type of the wheel accurately and also verify the correctness of finite elementmodal analysis of the wheel. Initially identify the action mechanism of the wheeldamper that the wheel damper is a type of damped vibration absorber.Analysis vibration characteristics and noise radiation characteristics of the wheelusing ANSYS software and Virtual.Lab Software. Analysis vibration response andmodal contribution of the wheel based on modal superposition method. A series ofconclusions obtained through this analysis, axial vibration is more significant duringlow frequency band while radial vibration is more significant during high frequencyband, the modal shape at595Hz,1051Hz,4457Hz have relatively large contributionto the overall vibration. Similarly, the modal shapes during the frequency range(500Hz~1300Hz,1800Hz~2300Hz,4300Hz~4600Hz)around these three frequency pointabove have relatively large contribution to the overall vibration. According to theprevious conclusion, focused on the modes of the three frequency band in the design ofthe damper. Get sound pressure distribution pattern on the wheel and on the outer soundfield, and also the wheel body section contribution to the noise radiation throughanalysis noise radiation characteristics of the wheel. The radiated noise in both sides inthe axial direction of the wheel is mainly from the vibration of the tread and the wheelplate, so the tread and wheel plate is the suitable mounting locations for the damper.Improve the damper according to the parameters of the preceding analysis and alsothe action mechanism of the damped dynamic vibration absorber. Determine the effective action frequency band, mounting location, analysis the effect to the noisereduction of damper mass, stiffness and damping and then, optimize the combinationof the various parameters to improve the damper. Test the vibration response and noiseradiation levels of the wheel mounted the improved damper,10dB noise reductioneffect is enhanced through the improvement of the damper.