Abstract
In recent years, the drive-system noise and vibration generating from the motor vehicle of the narrow gauge line vehicles are decreasing by adoption of the low noise traction motor, low noise coupling and a low gear ratio. However, the noise of the drive unit is expected to be further lower at present. In this paper, we explained the present situation of the drive-system noise and vibration of the narrow gauge line vehicles, and aiming at finding out effective countermeasures, we carried out several analyses. We introduced these analysis cases that included a sound source separation method of the drive system noise, the fluid acoustic analysis of the traction motor, and the analysis of a structure-sound field of the gear device.
