地铁轨道扣件系统动刚度对轮轨噪声的影响OA

To investigate the effect of fastener system dynamic stiffness on wheel-rail noise,a frequency-domain wheel-rail rolling noise prediction model considering the frequency-dependent characteristics of fasteners is established.The surface roughness of the wheel-rail was used as the input to the prediction model of the rolling noise,and contact patch filtering was considered to obtain the high-frequency vibration characteristics of the wheel and rail.The sound radiation power spectra of the wheel and rail under different fastener dynamic stiffness conditions were analyzed.Additionally,the rail components were discretized into a series of coherent point sound sources to study the influence of fastener dynamic stiffness on wheel-rail noise propagation.The results show that the dynamic stiffness of fasteners affects wheel-rail noise differently across frequency bands:the storage stiffness of fasteners primarily influences noise below 630 Hz,while the damping coefficient mainly affects noise below 800 Hz.For frequencies above 100 Hz,the dynamic parameters of fasteners predominantly affect the propagation range of wheel-rail noise,with minimal impact on the maximum instantaneous sound pressure generated by the wheel-rail interaction.