A Study on Determination of Damping Layer Thickness to Reduce Heavy Impact Noise in Apartment Building Floors

공동주택 층간 중량충격소음의 효율적 저감을 위한 바닥구조 감쇠층 두께 선정에 관한 연구

Apartment building floor with a damping layer can be modeled as a sandwich plate. In order to reduce low frequency noise more efficiently due to heavy impact on such a floor, thickness of the damping layer needs to be optimized at the design stage. Modal loss factors are determined in this paper by RKU equation which is popular In sandwich plate theories. Optimum damping layer thickness determined at each mode is weighted so that several modes in the frequency range of interest can be included in a more systematic way. Furthermore, to reflect frequency-dependent characteristics of complex stiffness of the damping layer, an iteration method is proposed in finding modal frequencies.