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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