Resistance/Reactance of porous materials for diffraction reduction

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thadman

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It is intuitively obvious that porous materials possess both a resistive component and a reactive component. Higher density materials often reflect high frequency content, but absorb more low frequency content. Lower density materials possess a lower amplitude high frequency reflection, but absorb less energy.

If we knew the specific damping capacity of the porous material, could we calculate the resistance/reactance wrt frequency?

Thanks,
Thadman
 
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bjorno

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Joined 2005
thadman said:
It is intuitively obvious that porous materials possess both a resistive component and a reactive component. Higher density materials often reflect high frequency content, but absorb more low frequency content. Lower density materials possess a lower amplitude high frequency reflection, but absorb less energy.

If we knew the specific damping capacity of the porous material, could we calculate the resistance/reactance wrt frequency?

Thanks,
Thadman
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Hi Thadman,

A good start is to investigate complex acoustic absorbtion/transmission and reflexion measurement using a Kundts tube and deduce the equations at:


http://lva.insa-lyon.fr/download/bancs_kundt_en.pdf

b
 
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