Characteristic Analysis on Gear Tooth Meshing Noise of Rack Railway Vehicle
Based on the mechanism of vibration radiation noise generated by stiffness excitation from gear teeth,COMSOL Multiphysics was used to establish a simplified prediction model of gear tooth meshing vibration and noise of rack railway vehicle.The prediction analysis of time-varying stiffness of gear-rack meshing,gear-rack meshing contact force,gear-rack meshing vibration radiation noise was carried out,and the formation mechanism and characteristics of gear-rack meshing vibration radiation noise of rack railway vehicles were revealed.The research results show that the number of pairs of teeth engaged at the same time in the process of gear-rack meshing changes periodically with time,which forms the stiffness excitation of gear-rack meshing.Therefore,the frequency spectrum of contact force of gear-rack meshing and the noise spectrum of gear and rack show obvious harmonic frequency vibration characteristics,and the harmonic frequency is an integral multiple of the meshing frequency of a single gear tooth (about 56Hz).In addition to the noise peak caused by harmonic vibration,there are also very significant peaks in the gear noise spectrum at frequencies 720Hz,2040Hz,3650Hz,and 4410Hz,which mainly come from the significant gear modal vibration.The rack noise is more significant in the frequency range of 2200～3000Hz,which is possibly due to the presence of dense vibration modes in the rack within this frequency range.
万方数据
维普
