Estimation of the impact noise level in wood constructions: choice of a global acoustic indice

This work concerns the characterization of the impact sound level in wood constructions from in situ measurements. Two global acoustic indices have been estimated and compared with each other, one associated with the excitation source that is the tapping machine, the other related to the excitation source that is the impact ball, likely to better characterize footsteps. These global acoustic indices were estimated over the frequency range [100 Hz: 3150 Hz] and over the frequency range [50 Hz: 3150 Hz], A-weighted or A-unweighted. A statistical study was then carried out on the di_erence between the global acoustic indice related to the tapping machine and that related to the impact ball. According to the choice of the frequency range and the use of the A-weighting, this statistical study made it possible to conclude on the sensitivity of these global acoustic indices with respect to the correction term normalizing the influence of the reception room and, with respect to the low frequencies [50 Hz: 100 Hz]. Finally, this statistical study concludes on the relevance of the use of a global acoustic indice compared to the other in order to characterize the impact sound level in these wood constructions.