Experimental Analysis of Factors Affecting Vehicle Interior Noise during the Curve Operation of Metro Vehicles

Objective In view of the high vehicle interior noise problem when running on curved lines, it is necessary to carry out in-depth research on its influencing factors. Method Roughness test and analysis of the wheel-rail surface of the tested vehicles in the track straight and curved sections are carried out. At the same time, the corresponding vehicle bogie area noise and vehicle interior noise at the curved track position before and after rail grinding are collected. Result & Conclusion The study reveals that the wheel roughness exceeds the standard ISO 3095:2013 Acoustics—Railway applications—Measurement of noise emitted by railbound vehicles by approximately 3 dB (A) in certain wavelength ranges, while the roughness of the inner rail of the curved section exceeds by more than 20 dB (A), the rail roughness of the straight section could meet the standard. After grinding, the bogie area noise and vehicle interior noise are significantly reduced. In addition, rail top friction adjustment devices are installed in two S-curve sections with a radius of 300 m. Research results of the comparative tests indicates that the device improves the lubrication conditions between the wheel and rail surfaces when passing the curve, reduces the wheel-rail vibration noise. The vehicle interior noise is also reduced to a certain extent by 3 dB(A) at the second curve. Therefore, in the small curve position of the track, the comprehensive strategy of rail grinding and wheel-rail lubrication state improving can reduce the vehicle interior noise when passing curves.