Sound quality evaluation for transient noise characteristics of high-speed railway interior

초록

This study presents interior noise characteristics of Korean high-speed train under different operating conditions. The in-terior noise was measured for various sound environments such as different speeds, concrete and ballast track, open and tunneled track, passing by another moving train. The transient variation of the sound pressure was recorded. The objective and subjective sound quality evaluation of the interior noise was performed. For quasi-static sounds measured for open lands and in tunnel, Zwicker’s loudness has dominant impact on the annoyance. When there is transient variations in the sound pressure encountered during entrance, exit and passing by, the sharpness and roughness also has significant impact on the perceived annoyance. The sound quality index was obtained using gradient values versus time for sound quality parameters. The obtained data is useful for design of interior of the train since the transient variation of the sound pressure level is influenced also by the sound environment in the room.