Effect of different wood in the acoustic isolation

Abstract

Acoustic isolation depends upon characteristics of the material, mainly on the dimensions, shape and density. The objective of this work was to evaluate the sound isolation provided by woods of different densities and verify the behavior of the isolation through spectral analysis. They were selected woods of the genera Eucalytus, Pinus and Dipteryx (Cumaru) with five groups of distinct densities. Boxes of 60 cm of internal edges were mounted. The equipment for the evaluation was mounted in a wide and grassy field. The experiment consisted in emitting a form of wave, generated in a computer by means of a loudspeaker localized inside the wooden box and picked it up by a microphone situated at a meter away. The level of sound pressure was measured with a decibelimeter. The wood which promoted the highest acoustic attenuation was E. grandis (0.880g/cm3) with an attenuation of 25.7 dB(A), but the wood of worst performance was Pinus sp with 15 dB (A). These woods presenting the highest and poorest density respectively.