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thread248-75316

Challenge !

Challenge !

(OP)
I have a 0.5 liter volume available to take off 6dB (or more) from a noisy source (motor+fan)with the following constraints/environnement.
-Noise to be taken off at air inlet
-Pressure drop < 2hPa for 1L/s
-noisy source : 42 dBA of broadband noise + F0 + 2xF0 (not dominant)
-F0 can be anywhere from 250Hz up to 450 Hz
-The small available space doesnot easily allow any Hellmoltz or 1/4 wavelength based design.
So far,I have tried a perforated panel design with only a 4dB absorbtion coefficient.
Any tips or litterature that could help will be welcomed.
Many thanks.
 
 

 
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