Acustica Urbana e Edificios Fauusp
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Transcript of Acustica Urbana e Edificios Fauusp
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Acústica UrbanaAcústica Urbana
título 2Disciplina CONFORTO AMBIENTAL ACUSTICO – Prof.José Fernando Cremonesi
FAU
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Propagação de ruídoFAU
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nte
ptor
fon
rece
pr
fonte sonora e receptorFAU
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L = 52 + 10 log (Q/d) + cv + c% + cidB(A)
Dados da via
distância fonte/receptor d = mdistância fonte/receptor d = _______ mnúmero de veículos/hora Q = ______ veículos valores de correção pelas tabelas para:
% de veículos pesados c = _______ velocidade cv = _______ inclinação da via em % ci = _______
Tabela de Correções cv correção devido à velocidade dos veículos velocidade 33 47 53 60 67 68 80 87 93
4 2 1 0 1 2 3 4 5cv -4 -2 -1 0 +1 +2 +3 +4 +5cv correção devido à % de veículos pesados % veículos 7 20 35 47 60 73 87 100
c% 0 +1 +2 +3 +4 +5 +6 +7cv correção devido à inclinação da via em % inclinação 0% 2% 4% 6%
ci 0 +1 +2 +3
equação de JosseFAU
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propagação do som no arFAU
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Frequência nominal em Hz Frequência exata Filtro A
10 10.00 -70.4
As frequências nominais foram retiradas da norma ISO 266
2.5
16
20
25
31.5
40
50
63
12.59
15.85
19.95
25.12
31.62
39.81
50.12
63 10
-63.4
-56.7
-50.5
-44.7
-39.4
-34.6
-30.2
26 263
80
100
125
160
200
250
315
63.10
79.43
100.0
125.9
158.5
199.5
251.2
316.2
-26.2
-22.5
-19.1
-16.1
-13.4
-10.9
-8.6
-6.6
400
500
630
800
1000
1250
1600
2000
398.1
501.2
631.0
794.3
1000
1259
1585
1995
-4.8
-3.2
-1.9
-0.8
0
+0.6
+1.0
+1 22000
2500
3150
4000
5000
6300
8000
10000
1995
2512
3162
3981
5012
6310
7943
10000
+1.2
+1.3
+1.2
+1.0
+0.5
-0.1
-1.1
-2.5
12500
16000
20000
12590
15850
19950
-4.3
-6.6
-9.3
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Filtros (a) (B) e (C) de ponderação
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C d f ê i 3 000 í l /hCurva de referência para 3.000 veículos/h125 250 500 1K 2K 4K f (Hz)84 76 74 72 68 60 dB (A)
L = 78 dB(A)calculado pela eq. de Josse
curva de referênciaFAU
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amortecimento por barreiraFAU
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eficiência da barreiraFAU
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barreira acústicaFAU
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barreira acústicaFAU
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barreira acústicaFAU
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barreira com vegetaçãoFAU
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Soma em dB ou dB(A)Diferença entre Somar ao maiorç
os níveis 0 a 1 +3 2 a 3 +2 4 a 8 +1 9 0
Somando os níveis dois a dois:Somando os níveis dois a dois:
60
68
69 74 77 80
72
74
76 8584
nível de ruído externo da curva de referência = 85 dB(A)
85
soma em dB ou dB(A)FAU
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reflexão do somFAU
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Poor
Better
Best
reflexão do somFAU
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barreiras acústicasFAU
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barreiras acústicasFAU
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barreiras acústicasFAU
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barreiras acústicasFAU
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barreiras acústicasFAU
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barreiras acústicasFAU
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barreiras acústicasFAU
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barreiras acústicas
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barreiras acústicasFAU
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barreiras acústicasFAU
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barreiras acústicasFAU
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barreiras acústicasFAU
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AbsorçãoFAU
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AbsorçãoFAU
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AbsorçãoFAU
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AbsorçãoFAU
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AbsorçãoFAU
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AbsorçãoFAU
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AbsorçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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Isolação
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Lei das MassasFAU
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Massa Mola MassaFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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a. Carpet on concrete
b. Carpet on concrete with suspended ceiling p p g
IsolaçãoFAU
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c. Carpet on floated concrete slab
d. Floated slab plus suspended ceiling
IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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IsolaçãoFAU
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Ex :01 ACÚSTICA URBANA
1) ESTABELECER O NÍVEL SONORO EM dB(POR OITAVA) QUE CHEGA EM UMA FACHADA SITUADA A 220m DE UMA VIA EXPRESSA COM AS SEGUINTES CARACTERÍSTICAS.:
18.000 VEÍCULOS/HORA; 80 km/h VELOCIDADE; VIA PLANA; 60% VEÍCULOS PESADOS K/h 33 47 53 60 67 73 80 87 93 CORREÇÃO / VELOCIDADE -4 –2 –1 0 +1 +2 +3 +4 +5 % 7 20 35 47 60 73 87 100 CORREÇÃO VEICULOS PESADOS 0 +1 +2 +3 +4 +5 +6 +7CORREÇÃO VEICULOS PESADOS 0 +1 +2 +3 +4 +5 +6 +7
Hz 125 250 500 1000 2000 4000 C d f ê i dB(A) 75 74 72 70 68 64Curva de referência dB(A) 75 74 72 70 68 64
FILTRO (A) -16 -9 -3 0 +1 +1
Fórmula : 52+ 10 Log . Q / d + correções
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Ex: 2 ACÚSTICA URBANA 1) ESTABELECER QUAL A ABSORÇÃO DO RECINTO QUE MEDE 3,0 X 4 ,0 ALTURA 2,7 COM JANELA MEDINDO 2,0X 1,2 (A JANELA ESTÁ NA PAREDE DE 3,0m) TENDO: ABSORÇÃO
Hz 125 250 500 1000 2000 4000 VIDRO 0.18 0.06 0.04 0.03 0.02 0.02 CARPETE 16 mm PISO 0 20 0 04 0 35 0 40 0 37 0 75CARPETE 16 mm PISO 0.20 0.04 0.35 0.40 0.37 0.75 ALVENARIA PINTADA 0.12 0.01 0.02 0.02 0.02 0.02 GESSO PINTADO TETO 0.12 0.09 0.07 0.05 0.05 0.04 MADEIRA PORTA 2.1X.80m 0.01 0.04 0.05 0.05 0.04 0.04 Fórmula: A=∑.α.s
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E 03Ex :03
ACÚSTICA URBANAACÚSTICA URBANA CONHECENDO A CURVA DO RUÍDO EXTERNO (Le) E A ABSORÇÃO INTERNA (A) ( ) Ç ( )ESTABELECER O NÍVEL DE RUÍDO EM dB(A) QUE CHEGA AO OUVIDO DO OBSERVADOR, NO INTERIOR DO QUARTO CUJA FACHADA É COMPOSTA DE ALVENARIA E VIDRO, SENDO A FACE QUE RECEBE O RUÍDO MEDINDO 3,0 x 2,7m E A JANELA MEDINDO 2,0 x 1,2m.
Hz 125 250 500 1000 2000 4000Hz 125 250 500 1000 2000 4000 CURVA DO RUÍDO Le dB 90 82 74 69 67 62 R do VIDRO LAMINADO dB 26 29 33 36 35 39 R da ALVENARIA dB 27 30 35 39 43 45 ABSORÇÃO ACÚSTICA – A 22.15 15.76 16.08 16.08 19.45 27.54
Formula : Li = (Le - R) + 10 Log S /A
Ex: 04 CONHECENDO OS DADOS DOS EXERCICIOS ANTERIORES, SUBISTITUIR O FORRO DE GESSO POE FORRO PACOTE DE LÃ DE VIDRODE GESSO POE FORRO PACOTE DE LÃ DE VIDRO. Hz: 125 250 500 1000 2000 4000 FORROVID 0,57 0,81 0,64 0,66 0,43 0,25