Study on the Effect of the Sound Transmission Coefficient of a Gangway on the Train Running in Tunnel

갱웨이의 음향투과손실치가 터널주행중 전동차의 실내소음에 미치는 영향

Internal noise level of a train running in tunnel is influenced by sound transmission coefficients of floor, side door, window and gangway as well as by the sound power levels of major noise sources. The structure of a gangway should be strong enough for the safety of passengers while it should be flexible enough for the movement of a train in curves. Due to this the sound transmission coefficients of gangways are relatively low compared to those of carbody structure. The effect of the sound transmission coefficient of the gangway is studied in this paper in regards to the existence of end doors.