| Summary: | 碩士 === 國立中興大學 === 森林學系 === 83 === The purpose of this study was to investigate the sound
insulation performances of woody panel walls and floors, and
understand the improvement effect by filling with other
insulation materials or the different constructure methods.
The sound intensity method ( the sound transmission loss (TL)
tested on woody walls ) and the measurement of floor impact
sound level ( the sound pressure level and vibration
acceleration level tested on woody floor ). The important
results are summarized as the followings: Regarding the woody
panel wall, the panels that were made from higher specific
gravity showed better sound insulation performance, the TL
values for red oak 39.3 dB and china fir 36.2 dB. The values
of sandwich structure panel walls was more excellent than
single panel. All of the samples, the improved effect of
filling with insulation materials for red oak panel walls
showed that the soundproof carpet with glassfiber (7.2 dB)
was the best, and the coated metal sheet (4.2 dB) was the
worst.With respect to the woody floors, the floor which
made from different wood species showed the higher hardness
and MOE, this could increase the floor impact vibration
characteristics. The floor made of the lumber frame type of
the red oak floor panel showed the light-weight impact
characteristics,it was better than the flat type. Filling with
the glass fiber can improve the resonance of floor panel.
All of the samples, the best improvement of sound pressure
level (SPL) in light- weight impact panel which filling
up the vibration- resistant pad with the glassfiber
(9.9 dB), the improved value was 13.1 dB and the improved
extent was 14%. The highest improved effects on the SPL in
heavy-weight impact was red oak panel filling up the
vibration- resistant pad with the vibration-resistant
cushion (9.7 dB). Regarding about the VAL, the panel filling
up vibration-resistant lining with glassfiber and floating
lumber
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