Acoustic absorption of micro-perforated panels

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Acoustic absorption of micro-perforated panels Muttalip Temiz Mico Hirschberg Ines Lopez Arteaga
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    07-May-2022
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Transcript of Acoustic absorption of micro-perforated panels

Voortgang en Toekomstplannen• How does it work?
• TANGO results
• Future steps
Micro-perforated panels
Small holes (ø ~ 1 mm ), low
porosity (σ ~ 1%)
release and acoustics leads to a feedback mechanism.
Heat
Release
Oscillations
Acoustic
Oscillations
• Micro-Perforated materials are made of
metals.
• Durable,
• Non-flammable,
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Different hole diameters result with different absorption / reflection values.
dp/2 δv
Increasing frequency
Increasing Shear number
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model a single perforation.
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one sample to another*.
133 (3), 2861-2866, 2011
Example of TANGO Results
A 0.3 1.0 0.76
B 0.8 1.0 0.74
C 1.6 1.6 0.72
Sample
dimensional parameters
α and δ depend only Sh for sharp edge limit.
Limit values of both resistive and reactive end corrections for
high Sh agree with earlier results.
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• Different hole geometries,
(MPPs with slits)
• Effect of non-linearity.
(High amplitude excitation)
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