철도차량 주행 소음원의 수평 지향 특성 연구

초록

In order to evaluate the amount of railway noise pollution and make the measures for reducing noise, one needs accurate prediction of the noise from the running train, which requires a good knowledge of the source characteristics, as well as its propagation. The directivity of source should be determined for each spectral component since the noise propagation process is also dependent on the frequency. In this paper, the noise source of a moving railway vehicle was characterized using the line source models having different directivity. The horizontal directivity pattern approximating the actual source was studied by comparing the rise and decay of the measured octave-band noise levels during the passing of a train with the predicted ones. The method was applied to find the horizontal directivity pattern of noise sources from KTX and KTX-Sancheon having the speeds of 269 and 286 km/h, respectively.