Experimental investigation on the rolling noise and train interior noise reduction effect with tuned particle impact damper

Railway noise has become a major issue and rolling noise which is generated by the surface roughness of wheel and rail plays an important role to the railway noise. In order to reduce the rolling noise, tuned particle impact damper was developed in previous study. The proposed damper has superior vibration reduction capability in a specific target frequency domain, and also has good damping in the broadband frequency range by the inelastic particle collision effect. To analyze the vibration and noise reduction performance of the tuned particle impact damper, testing samples were installed 150m long over the rail track between the Wangil and Geomdanoryu station, Inchon, South Korea. The vibration reduction effect was verified before and after the installation. The rolling noise and train interior noise were also measured during the train was in operation. The difference of equivalent noise level, frequency characteristic and sound quality index were analyzed .