Study on performance enhancement of noise barriers in consideration of noise characteristics of korean high-speed railways

초록

This study deals with the reinforcement technique for the noise barriers along the korean high-speed railway lines. Korea Train Express (KTX) with the maximum speed of 300 km/h have started revenue services since April 2004 and Korean High Speed Train (KHST) designed to operate at 350km/h is under on-line test. Due to the special noise source distribution characteristics of the high speed train which depend on the train speed, assiduous research on noise reduction technique along the railway lines is in demand. In this paper in consideration of noise characteristics under various speed conditions, sound incidence directions and environmental conditions acoustical effects of various acoustic impedances of the upper section of noise barrier on the shadow zone creating performance is investigated. The numerical study shows the possibility of enhancing the performance of existing barriers by efficient acoustical impedance control of the upper sections.