Abstract
As the number of old apartments increases, a method that reduces heavy weight floor impact sound during remodeling or repair work needs to be developed. Generally, apartment ceilings are constructed using gypsum boards with an air layer approximately 170 mm to 200 mm from the bottom slab. This air layer causes amplification of heavy impact sound in the 63 Hz ~ 125 Hz frequency band. In this study, to reduce amplification of sound, a ceiling structure composed of sound-absorbing material and perforated gypsum boards is used. For optimal design, the sound-absorbing performance of ceiling constructs are tested. Moreover, the selected ceiling structure is constructed for a laboratory similar to an apartment house to verify heavy-weight impact sound insulation performance. The experimental results show that sound was reduced by 2.6 dB at 63 Hz and by 0.7 dB at 125 Hz. For a rubber ball, it was reduced by 1.8 dB at 63 Hz and by 1.6 dB at 125 Hz. Single number quantity(LSUBi,Fmax,AW/SUB) is reduced bang machine by 1 dB and rubber ball by 2 dB.
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