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ISBN-10: 0240812239

ISBN-13: 9780240812236

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Quando duas fontes funcionam simultaneamente o nível sonoro resultante corresponde a um acréscimo de 3 dB no nível sonoro inicial. Por exemplo, (fig. A6), dois caminhões, com um Nível de Potência Sonora (NPS) de 70 dB, cada, funcionando juntos produzirão um ruído de 73 dB (NPS total). NPS total = 73 dB NPS = 70 dB Fig. A6 Infelizmente a recíproca é verdadeira... Quando duas fontes emitem ruído simultaneamente o nível sonoro total será igual ao da fonte mais potente, acrescido do valor fornecido pela tabela abaixo: NPS total NPS1 – NPS2 0 3 1 3 2 2 3 2 4 2 5 1 6 1 7 1 8 1 9 1 10 0 Se a diferença for superior a 10 dB, o nível sonoro total será igual ao maior dos dois.

Transmissão Um ruído pode “atravessar” uma parede ainda que ela não apresente nenhuma abertura. O que ocorre é que ao ser atingida por uma onda sonora a parede vibra e passa a funcionar como uma nova fonte. Neste caso podemos dizer que o som foi transmitido pela parede. PROARQ e DTC – FAU - UFRJ 39 Conforto Ambiental 1° semestre 2005 E incidente E transmitida Fig. A9 Para obter um bom isolamento sonoro é conveniente verificar o índice de redução sonora (R) proporcionado pelo material (fig. A10).

Eref Einc – energia incidente Edis Etra Einc Edis Eref – energia refletida Etra – energia transmitida Fig. A14 Na realidade, nenhum material é totalmente absorvente (ou reflexivo), parte da energia sonora sendo sempre refletida pelo material (fig. A14). ). 3 Homenagem a Wallace Sabine PROARQ e DTC – FAU - UFRJ 42 Conforto Ambiental 1° semestre 2005 O desempenho de um material como absorvente acústico varia segundo as diversas faixas de freqüência. Dois são os principais tipos de materiais absorventes: ƒ Materiais Fibrosos e Porosos – permitem que a onda sonora penetre e se propague em seu interior.

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Biologia Mattas - Apostila Basica De Conforto Ambiental


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