Corrections in the determination of the sound power level obtained through intensimetry technique / Correções na determinção do nivel de potencia sonora obtido atraves da tecnica da intensimetria

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Many Brazilian cities are facing noise pollution problems. Traffic noise is the main cause of inconvenience followed by noise generated by equipments used in civil construction. In order to maintain a certain life quality level in large cities it is paramount to control noise emission and propagation generated by civil construction. Sound power level is an important parameter to analyze environmental sound propagation. The sound power level can be determined through ín sítu measurement of sound intensity even in the presence of other sound sources. Therefore, it is not necessary to remove the analyzed equipment to anechoic or reverberation chambers. This work studies the corrections in the determination of the sound power level obtained through intensity technique. The state of art compilation about the subject should be pointed out. Both a standard and a measurement system, which can be used at construction sites and industries related to civil construction, were selected. Results from the sound power level measurements of an electric drill, with and without background noise, acquired through the standard ISO 9614-2 (1995) were compared to those acquired in a reverberation chambers through the standard ISO 3741(1999). This comparison allowed to study three new field indicators, the Absorption Factor, the Surface Factor and the Relation of Source to Measured Surface Area Factor which were used as base in the error analysis of the final result on sound power level, providing a reliable methodology that can be used in the control of environmental noise

ASSUNTO(S)

sound intensity intensity technique ruido - medição acustica arquitetonica poluição sonora sound power

ACESSO AO ARTIGO

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