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Calculate of soundproofing.

Benchmark data: density, ρ=2500 kg/m3;

wall thickness h=180 mm.

Calculate.

1. We define surface density of building envelop:

2. We define amplitude-response curve of building envelop soundproofing.

We must find coordinates of the point В on the amplitude-response curve.

 

 

X-coordinate of point (fв) is define in table of the applicable Code Design. It depend of thickness and density of construction.

We define B y-coordinate. It depend of surface density:

 

Amplitude, Hz The normal value of insulation Estimated value insulation Adverse deviations dB Offset Adverse deviations dB
100 33 36 + 29 +
125 36 36 0 32 +
160 39 36 -3 35 +
200 42 36 -6 38 -2
250 45 38 -7 41 -3
315 48 40 -8 44 -4
400 51 42 -9 47 -5
500 52 44 -8 48 -4
630 53 46 -7 49 -3
800 54 48 -6 50 -2
1000 55 50 -5 51 -1
1250 56 52 -4 52 0
1600 56 54 -2 52 +
2000 56 56 0 52 +
2500 56 58 + 52 +
3150 56 60 + 52 +
Amount of adverse deviation -65 -4 -24

If amount of adverse deviation more than 32dB, then appraisal curve shifts on 4 dB, that amount of adverse deviation was less than permissible value.

 

Index value of insulation is y-coordinate of offset appraisal curve on 500Hz.

We get the index value equal to insulation 48 dB. This reinforced panel is satisfies the requirements of sound insulation.

 


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