고속차량 소음원 특성에 관한 연구

초록

In this paper the noise characteristics of KTX are analyzed in order to study the interior noise mechanism of KTX in slab tracks, which has become an issue since the commercial operating in 2004. The analysis of the interior noise of KTX in tunnel with concrete track shows sharply increased noise level in the range of 80Hz that is the natural frequency of the KTX carbody. The frequency characteristics of noise and acceleration levels of KTX in tunnels are compared to understand the interrelation between the noise inside the vehicle and outside the vehicle in the slab track tunnel. As a noise abatement method, the mud-flap was modified with intend to reduce the noise outside gangway and the interior noise inside the passenger compartment ultimately. The effect of this mud-flap modification on the interior noise is introduced and discussed.