Actively controlled sound field on the top edge of noise barriers for railway noise reduction

철도소음 저감 향상을 위한 방음벽 상단의 능동제어장치

In this study the sound field on the surface of the top edge of noise barriers is actively minimized to enhance the shielding effect without increasing the hight of the barrier. First the results of a numerical study are shown; the sound field reduction in the far field due to a cylindrical active headpiece attached to a semi-infinite screen and the related control parameters are investigated. The results of a model experiment in an anechoic chamber and optimal control parameters for noise control on the railway side are shown and discussed.