andrei ioana adriana_acustica.pdf
TRANSCRIPT
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2. CALCULUL ACUSTIC 1. Analiza zona de zi etaj V= volumul incaperii
T= timpul de reverberatie masurat conform stas 6691/1-70 [s]
S= suprafata fiecarui element de constructie a incaperii [mp]
A= coefficient de absorbtie al materialelor utilizate la finisaje
Si=30.50m2
V=85.40 m3
H=2.80 m
Calculul duratei de reverberatie T in zona de zi
T=0.161*V/A [s]
Unde:
V=volumul incaperii [m3]
A= aria de absorbtie echivalenta [m2]
A= ii S* j
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1. Date generale: L=6.36m
l= 4.81m
S=30.50 m2
H=2.80m
V=85.40 m3
2. Calculul suprafetelor (finisate) Stencuiala=(6.36*2.8-1.10*2.20)+4.81*2.8-(2.00*1.70+3.76)+(4.81+6.36)*2.8= 55.17m
2
Spardoseala-parchet=30.50
Susi=2.1*0.90=1.89 m2
Sfereastra=1.05*1.70+2.00*1.70=5.12m2
Sdulap=2*(1.2*3+1.1+0.40)=10.20m2
S draperie =(2.4+2.4)*2.4=11.52m2
S canapele =2.4*0.9+4*0.43*0.43*3.1415=4.48m2
S masa =1.2*0.7=0.84m2
S sezlong =1.80*0.65=1.17m2
S plafon =30.50
Denumire
material
S
[m2]
125 250 500 1000 2000 4000
*S *S *S *S *S *S
Tencuiala 55.17 0,02 1,103 0,02 1,103 0,03 1,655 0,04 2,207 0,05 2,758 0,05 2,758
Pardoseala
parchet
30.50 0,04 1.22 0,04 1.22 0,06 1.83 0,08 2.44 0,08 2.44 0,1 3.05
Usa pvc 1.89 0.02 0.038 0.02 0.038 0.03 0.057 0.04 0.077 0.04 0.077 0.05 0.094
Fereastra 5.12 0.35 1.792 0.25 1.28 0.18 0.921 0.12 0.614 0.07 0.358 0.04 0.205
Dulap lemn 10.20 0.02 0.204 0.02 0.204 0.03 0.306 0.04 0.408 0.04 0.408 0.05 0.51
Draperie 11.52 0.06 0.691 0.27 3.11 0.44 5.07 0.5 5.76 0.4 4.61 0.35 4.032
Canapele
stofa
5.65 0.1 0.565 0.23 1.30 0.23 1.30 0.22 1.243 0.19 1.07 0.18 1.02
Masa lemn 0.84 0.02 0.017 0.02 0.017 0.03 0.025 0.04 0.035 0.04 0.035 0.05 0.042
Suprafata
plafon
30.50 0.02 0.61 0.02 0.61 0.03 0.915 0.04 1.22 0.05 1.525 0.05 1.525
Oameni 4 0.35 1.4 0.41 1.64 0.42 1.68 0.46 1.84 0.49 1.96 0.50 2
)*( Si
7.64 10.52 13.76 15.84 15.241 15.236
T=0.161*V/A
[s]
1.79 1.30 0.99 0.87 0.90 0.90
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Izolarea la zgomot aerian a unui perete interior IA(EA)
1. Date generale Peretele are rol de perete despartitor living si livingul vecin si este alcatuit din beton celular autoclavizat de
25cm grosime, finisat cu tencuiala din mortar de var pe ambele fete.
Sperete=4.8*2.8 =13.44m2
2. Determinarea curbei indicilor de atenuare Rf Tab II 4/pag 102
a) Masa pe unitatea de suprafata m=0.04*1700+0.25*650=230.50kg/m
2
b) Frecventele fB si fC
fB=
=29.07 41Hz
fc=
=186.55 260Hz
RB=RC= 29dB
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Frecv f Hz Valori ale indicelui de
atenuare R pe: Abateri ale curbei
Curba etalon
dB
Curba reala
calculata
Curba etalon
dB
Deplasata in
jos cu 11 dB
100 33 29 -4/2 +5/2
125 36 29 -7 +4
160 39 29 -10 +1
200 42 29 -13 -2
250 45 29 -16 -5
315 48 31 -17 -6
400 51 34 -17 -6
500 52 38 -14 -3
630 53 40 -13 -2
800 54 42 -12 -1
1000 55 44 -11 0
1250 56 47 -9 +2
1600 56 48 -8 +3
2000 56 51 -5 +6
2500 56 53 -3 +8
3150 56 55 -1 +10
158)( 25)( Vom avea: Tab II. 2 Pereti BCA 32(-20)
E A= - 11 dB
I A= E A +52 = -11+52 = 41dB .