实际运用工况下地铁车辆弹性车轮降噪效果研究OA

Resilient wheels exhibit excellent vibration damping and noise reduction performance,They have been widely applied in urban rail transit vehicles domestically and internationally.To evaluate the noise reduction effect of resilient wheels,their noise characteristics under actual metro vehicle operating conditions are studied through laboratory and on-track tests.Results of the research indicate that under the identical external excitation,the time consuming of noise decay of the resilient wheel to background levels is reduced by up to 90%compared to traditional steel wheel.Under radial excitation,the resilient wheel can significantly attenuate noise above 1 000 Hz,while under axial excitation,attenuation is noticeable above 400 Hz.During full-line ATO operations,the peak noise in the passenger compartment can be reduced by up to 7.5 dB(A),with more pronounced effects at higher speeds and greater internal noise levels.On curved section with a 450m curvature radius,the instantaneous maximum noise reduction can reach 9.8 dB(A),while on the curved section with small curvature radius in the depot,the wheel-rail noise reduction can be up to 15 dB(A).On straight tracks,the maximum noise reduction in cabin is 2.8 dB(A).Test data demonstrate that resilient wheels have significant noise reduction effect for metro vehicles.This study has a practical significance for assessment of noise reduction effect of metro vehicles with resilient wheels and the application of resilient wheels.