| Keywords |
Apartment building ; Heavy-weighted floor impact sound ; Floor impact sound isolator ; Dynamic stiffness |
| Abstract |
This study investigated the effects of material properties of floor impact sound isolators on heavy-weighted floor impact sound level. The materials of sound isolators were EPS (Expanded Poly-Styrene) and EVA (Ethylene Vinyl Acetate), and their thickness were 20 and 30 mm. Floor impact sounds excited by bang-machine and rubber ball were measured in both conditions with and without floor finishing including the sound isolators on the structural slab. Reduced heavy-weighted floor impact sound levels by sound isolators were then analyzed. Result showed that embossed shape and composite materials such as PE (Poly-Ethylene) mesh and absorbent cloth of sound isolator were effective for reduced floor impact sound level for EPS and EVA, respectively. Dynamic stiffness among properties of the sound isolator was highly correlated with the reduced heavy-weighted floor impact sound level in the 63 Hz octave band. It was found that the reduced floor impact sound level by rubber ball was smaller in the 63 octave band, but was lager in the bands over 125 Hz and single number quantity than that by bang-machine. |