Porous material is used at the duct wall in order to reduce air resonance in the air intake duct. High frequency component in the intake noise is reduced by escaping of the air through the duct wall. The relation of attached position, the size and air permeability of the porous material to acoustic behaviors was cleared.
Acoustic Analysis of Unreflective (Non-Resonant) Duct
Sae Technical Papers
SAE 2002 World Congress & Exhibition ; 2002
2002-03-04
Aufsatz (Konferenz)
Englisch
Acoustic analysis of unreflective ( non-resonant ) duct
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