Uma metodologia para quantificação da contribuição sonora de fontes de ruído industrial no meio ambiente

Abstract

In the last twenty years, studies about the effect of the noise in the hearing and in the quality of life of the human being had gotten a great impulse, considering that the noise can cause disturbances during the sleep and in the health of the human being. One of the biggest sources of these studies, aims to analyze the influence of the industrial noise in the quality of the exterior environment where the people circulate or remain, being this type of noise one of the biggest causes of claims of the communities in the competent agency of its city. Once numerical-computational simulations for control of ambient noise generate errors of the order of 5 dB, a methodology consisting of the determination of Transfer Function (FT) between the noise source of interest and the receiving point, using adaptive filter LMS (Least Mean Square) and a reference source (generating of sine sweep). With the FT estimated and the acquired signal (acoustic pressure) next to the noise source, which we want to quantify, it is possible to estimate the level of noise proceeding from this source in the receiving point, which is located externally to the industrial plant. Excellent results were obtained with numerical simulations that agreed reasonably with experiments. However, the capacity of filtering of the filter is compromised when the level of energy of the reference source is reduced if compared with the energy generated for the other sources in the receiving point.