01

Measurement of sound absorption in reverberation chamber

Tipo: Test standard

Standard: UNI EN ISO 354:2003

Clienti:

This method tests the ability of an element to absorb the sound energy emitted by the source. The evaluation index expressed is the sound absorption coefficient weighted according to UNI EN ISO 11654:1998is αw, which is assigned a class as follows: Class: A / αw- Values 0.90; 0.95; 1.00 / Absorption class: highly absorbent Classe: B / αw - Valeus 0,80; 0,85 / Absorption: highly absorbent Class: C / αw - Values 0.60; 0.65; 0.70; 0.75 / Absorption class: very absorbent Class: D / αw - Values 0.30; 0.35; 0.40; 0.45; 0.50; 0.55 / Absorption class: absorbent Class: E / αw - Values 0.15; 0.20; 0.25 / Absorption class: poorly absorbent Class: not classified / αw- Values 0.05; 0.10 / Absorption class: reflective The test is carried out in the reverberation chamber, emitting and switching off the source. The reverberation time is evaluated, i.e. how long it takes to go from the emission to the detected background noise of the empty reverberation chamber. Then you install the material and test it again by checking the variation. For example, in a material that has an αwof 0.7, 100% of the sound energy emitted the material absorbs 70%.
IN DEPTH
Presentation / Maurizio Vescovi, Chemolli Fire, “Knowing the performance of the closures to design properly”
01

Measurement of sound absorption in reverberation chamber

Tipo: Test standard

Standard: UNI EN ISO 354:2003

Clienti:

This method tests the ability of an element to absorb the sound energy emitted by the source. The evaluation index expressed is the sound absorption coefficient weighted according to UNI EN ISO 11654:1998is αw, which is assigned a class as follows: Class: A / αw- Values 0.90; 0.95; 1.00 / Absorption class: highly absorbent Classe: B / αw - Valeus 0,80; 0,85 / Absorption: highly absorbent Class: C / αw - Values 0.60; 0.65; 0.70; 0.75 / Absorption class: very absorbent Class: D / αw - Values 0.30; 0.35; 0.40; 0.45; 0.50; 0.55 / Absorption class: absorbent Class: E / αw - Values 0.15; 0.20; 0.25 / Absorption class: poorly absorbent Class: not classified / αw- Values 0.05; 0.10 / Absorption class: reflective The test is carried out in the reverberation chamber, emitting and switching off the source. The reverberation time is evaluated, i.e. how long it takes to go from the emission to the detected background noise of the empty reverberation chamber. Then you install the material and test it again by checking the variation. For example, in a material that has an αwof 0.7, 100% of the sound energy emitted the material absorbs 70%.
IN DEPTH
Presentation / Maurizio Vescovi, Chemolli Fire, “Knowing the performance of the closures to design properly”

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Sound absorption

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Sound absorption