Sound insulation of wooden three-layered material, 1: Sound transmission loss of wooden three-layered walls
2010
Nakamura, T., Kumamoto Univ. (Japan) | Yano, T. | Murakami, K. | Hasegawa, A. | Etoh, T. | Takahashi, Y. | Kitahara, R.
In the present study the sound insulation of three-layered walls composed of cedar timber and plywood was measured and evaluated in accordance with JIS A 1416 and JIS A 1419-1, and compared with that of conventionally constructed walls. The results were as follows: (1) The three-layered walls have higher sound insulation over all frequency ranges than conventionally constructed walls; (2) They have no clear coincidence effect in the range from 2000 to 4000 Hz; (3) The center board is efficient in that there was no sound insulation reduction by the outlet holes which are usually found in two-layered walls; (4) Though three-layered walls which bond plasterboards to both sides of reinforced concrete walls have sound insulation reduction in the frequency range from 200 to 400 Hz by lower frequency resonance, the developed three-layered walls have little insulation reduction by that resonance.
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