Experimental Study on Vibration and Noise of the Railroad Gear Unit using ODS and Beamforming Method

<b>Trends in Recent Research on Main Circuits and Traction Systems for Railway Vehicles</b>

“…Given the above, stationary rotation tests were conducted on Shinkansen gear boxes. Using beamforming techniques, attempts were made to clarify the characteristics of vibration and noise from real gear boxes [9]. Beamforming techniques use array of microphones (four used in the rotation test) to search for sound sources in specific directions based on arrival time intervals (phase differences) between incident waves.…”