Floor Impact Sound and Vibration Characteristics with Types of Ceiling Structure and Finishing Material in Wall Structure Testing Facility of Slab Thickness 120mm

This study investigated the characteristics of floor impact sound and vibration by finishing structures and materials on ceiling. Floor impact sound and vibration measurements in a wall structure testing facility of slab thickness 150mm were conducted using heavy and light weight impact sources, with and without several finishing structures and materials on the ceiling. The gypsum boards were suspended by steel hangers or supported by brackets on the wall with and without sound absorbing materials. The ceiling structures covered 7 types according to slab thickness(120mm, 210mm), ceiling heights(180mm, 270mm), hanging type, structures(flat ceiling, coffered ceiling), and materials(steel, wood). The finishing materials included gypsum boards(9.5mm, 12.5mm), perforated gypsum board(12.5mm), resonant sound absorber, and absorbing material as glasswool 24k(50mm). Results showed that for all types of ceiling structure, absorbing materials reduced 3~5 dB in single number quantity for heavy-weight. The types of ceiling structure had no reduction in single number quantity for heavy-weight. It was also found that the direct structure-borne noise governed the noise by vibration of ceiling structure and finishing materials in low frequency range below 100 Hz for heavy-weight floor impact sound.