Study on subway resilient wheel's influence on noise inside the vehicle and in the bogie area through the in-situ measurements

Based on a new type of resilient wheel installed on a subway train, a measurement campaign is devised to evaluate the effectiveness of the resilient wheel in reducing noise. For reference, the same series of tests are carried out on another train of the same type but fitted with conventional wheels. The measurements involve the noise of various parts of the vehicle-track system which are used to investigate the sources of wheel-rail rolling noise, the noise inside the vehicle, and the noise close to the wheels. The series of tests are conducted on the normal-conditioned and corrugated track on which the two sets of trains pass through at difference speeds. It is found that the decrease of interior noise measured on the corrugated track is within the range of 0.2~10.5 dB(A), which is greater than on normal conditioned track after using the resilient wheels. This attributes to the frequency range available for vibration reduction by using the resilient wheel covers the dominant frequency range of the excitation from corrugation.