경량 바닥 적층재 차음성능

Speed up of a high speed train requires weight reduction of the train body and it increases the interior noise and deteriorates the ride quality. In this study. in order to diagnose the possibility of the weight reduction of the train body, we compare the sound insulation performance and bending stiffness of layered elements of the train floor structure. As the layered elements, sound transmission losses of plywood, foamed aluminium and nomex honeycomb are measured according to ASTM E2249-02. In addition, total sound transmission losses are measured and compared on the floor layered structures, which consist of these elements and a damped aluminium extrusion panel. Finally, considering bending stiffness of each elements and a damped aluminium extrusion panel. Finally, considering bending stiffness of each element, the applicability of each element to the floor structure is comprehensively investigated.