Study on Abnormal Interior Noise of High-Speed Trains

Field experiments were carried out to investigate abnormal interior noise generation in a coach used as a dining car of a high-speed train, including field measurements to investigate the interior noise conditions of another passenger coach under the same operating conditions. Sound quality indexes at each interior noise measuring point were analyzed to determine the characteristics of the abnormal interior noise. The differences of vibration and noise in the two coaches were then compared to show the effect of the interior structure of the coach on the abnormal interior noise. In addition, the differences of vibration and noise in the dining coach before and after the wheel re-profiling were compared to examine the effect of the wheel roughness on the abnormal interior noise. The present work has identified mechanisms of abnormal interior noise generation in the dining car.