sound absorption of aluminium plates

Acoustical Application Tests of Perforated Metals - IPA

NRC stands for Noise Reduction Coefficient, a standard measure for sound absorption which is reflected in the Y Axis Scale. A material with a NRC of 1.10 is approximately 5% more efficient as a sound absorber than a material with an NRC of 1.05. The test results demonstrate, again, a high degree of transparency for the IPA #115 material.

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(PDF) Limits of perfect sound absorption in thin aluminum ...

In order to improve sound absorption in 100–1600 Hz, a compound sound absorber comprised of perforated plates with extended tubes (PPET) and a PSAM is proposed in this paper.

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Sound Absorption Of Aluminium Plates - Image Results

More Sound Absorption Of Aluminium Plates images

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sound absorbing plate - alibaba.com

Alibaba.com offers 1,527 sound absorbing plate products. About 2% of these are acoustic panels, 1% are aluminum sheets, and 1% are other auto parts. A wide variety of sound absorbing plate options are available to you, such as free samples, paid samples. There are 1,449 sound absorbing plate suppliers, mainly located in Asia.

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Development and Practical Application of a Sound Absorbing ...

General features of a microperforated aluminum panel include: 1) Acoustic performance: sound absorption efficiency can be designed using parameters including the thickness, perforation diameter, and aperture ratio of the microperforated aluminum plate and foil as well as the thickness of the air space behind.

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Underwater sound absorption characteristics of metamaterials ...

In order to study the effect of the materials of backing on sound absorption characteristics, the backing of LRSMs are set as the steel, plumbum, and aluminum plate, respectively, and the numerical results are shown as Fig. 16. It can be found that the frequency of the first absorption peak is not affected by the materials of backing, and the materials of backing mainly affect the second absorption peak.

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Sound Absorption Coefficient Chart | JCW Acoustic Supplies

Absorption coefficients of common building materials and finishes. Fiberglass board (50mm (2″) thick) 0.18 0.76 0.99 0.99 0.99 0.99 Fiberglass board (75mm (3″) thick) 0.53 0.99 0.99 0.99 0.99 0.99 Fiberglass board (100mm (4″) thick) 0.99 0.99 0.99 0.99 0.99 0.97 Open brick pattern over 75mm...

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CN201305116Y - Sound absorption and insulation ceiling ...

The absorption, sound insulation ceiling according to claim l, characterized in that the perforated aluminum plate (1) all around the hemming working downward, plastic coated aluminum plate (6) all around the hemming working upward, punching an aluminum plate (1) downwardly around the flange and plastic coated aluminum plate (6) upwardly around the flange are connected together in overlapping shape.

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Vibro-acoustic behaviour of micro-perforated plate for sound ...

As a new sound absorption material, micro-perforated aluminium thin plate has been developed, which is tough for water, oil, or heat. But thin elastic plate is easily vibrated by sound pressure.

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Sound absorption of plates with micro-slits backed with air ...

Similarly to plates with circular perforations , the sound absorption of micro-slotted plates can be controlled by the plate thickness ℓ p, the perforation rate ϕ, and the width of slits a. For a thin perforated plate backed by an air cavity, the surface impedance can be approximated as

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Normal Incidence of Sound Transmission Loss from Perforated ...

Figure 3 shows the analytical result of sound transmission loss (TL) of perforated panels having micro and macro size holes. The calculation is conducted for an aluminium plate with density 2700 kg/ and thickness 1 mm.

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