소형 시험체 설치조건에 따른 음향감쇠계수 고찰

The minimum size of specimen for measuring sound reduction index on KS F 2860(ISO 140-1) should be at least 10㎡. However, it takes many time and efforts to install full size specimen. Therefore, it is valuable to study the sound reduction index with a small sized specimen. The purpose of this study is to investigate the sound reduction index of small sized specimen and to compare with that of full size specimen. Measurement were carried out in acoustic chamber according to change of specimen setup condition, shape of aperture and structure of filler element. As a specimen, lightweight panel and gypsum board were used. The result shows that it is valuable to use small sized specimen in the case of the specimen with a low sound reduction index such as single panel structure or reinforced filler element with a high sound reduction index.