Noise source identification of korean high speed train

초록

This paper deals with the noise source identification of the Korean High Speed Train (KTX) at the maximum commercial speed of 300 km/h. Typical pass-by noise sources and their frequency characteristics are investigated, it is primarily aimed at investigating the location and characteristics of the low frequency noise (60 Hz~100 Hz) related sources, however. This low frequency range noise has become an issue in the interior of the KTX, especially at passing through the tunnels with slab track system. For the purpose of identifying the main noise sources the results from the microphone array tests are analyzed in relation to the remarks from analytic studies which have been done with the intention of understanding the aerodynamic source mechanism and rolling mechanism. The acoustical image shows the low frequency noise sources mainly at the position of the under part of the train and the related source mechanism are discussed