INDUCTION SYSTEM DUCT WITH NOISE ATTENUATING HOLES
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United States of America Patent
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Issued Date -
Oct 2, 2008
app pub date -
Mar 30, 2007
filing date -
Mar 30, 2007
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A duct for an induction system is provided that has an effective length between an inlet and outlet. An aperture is provided a wall of the duct at a location corresponding to a pipe resonance for attenuating noise at the pipe resonance frequency. In one example, the aperture is provided using a cluster of holes arranged at the location. Multiple apertures are arranged about a circumference of the duct, for example, at opposing sides of the duct. In one example, an aperture is provided at a distance of approximately one quarter the effective length from both the inlet and the outlet. A porous non-woven structure is arranged over the aperture to minimize pressure losses associated with the aperture.
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