An induction passage noise attenuator and a system are provided. The induction passage noise attenuator may include a series of surfaces arranged within an enclosure upstream from a clean side air duct on an induction inlet for an internal combustion engine. Each surface of the series of surfaces ma
An induction passage noise attenuator and a system are provided. The induction passage noise attenuator may include a series of surfaces arranged within an enclosure upstream from a clean side air duct on an induction inlet for an internal combustion engine. Each surface of the series of surfaces may have a diametric extent being substantially in line with an inner diameter of the clean side air duct.
대표청구항▼
1. An induction passage noise attenuator comprising: an outer first enclosure;an air filter disposed within the outer first enclosure and physically coupled on a downstream surface to an upstream surface of a surrounding surface open only on a downstream end, the surrounding surface housing a sonica
1. An induction passage noise attenuator comprising: an outer first enclosure;an air filter disposed within the outer first enclosure and physically coupled on a downstream surface to an upstream surface of a surrounding surface open only on a downstream end, the surrounding surface housing a sonically porous filler material disposed between a series of surfaces, each of the surfaces having a center hole therein, arranged within an enclosure upstream from a clean side air duct on an induction inlet of an engine, each surface of the series of surfaces being angled outward in a downstream direction and having a diametric extent being substantially in line with an inner diameter of the clean side air duct. 2. The induction passage noise attenuator of claim 1, wherein each of the surfaces in the series of surfaces is a frusto-conical member. 3. The induction passage noise attenuator of claim 2, wherein each of the frusto-conical members are substantially the same size and shape. 4. The induction passage noise attenuator of claim 1, wherein the series of surfaces are arranged to form a series of pockets in line with an induction air flow path defined within the clean side air duct. 5. The induction passage noise attenuator of claim 1, wherein the air filter is disposed within the outer first enclosure substantially adjacent to an upstream side of the first outer enclosure, and extends radially across a diametric extent of the outer first enclosure such that air through the induction passage is configured to pass through the air filter before entering an annular passage between an inside surface of the outer first enclosure and the diametric extent of the series of surfaces. 6. The induction passage noise attenuator of claim 1, wherein the series of surfaces are each arranged at an acute angle with respect to a central axis of the outer first enclosure. 7. The induction passage noise attenuator of claim 1, wherein the series of surfaces are each arranged at an angle with respect to a central axis of the outer first enclosure of approximately between 25 degrees and 65 degrees. 8. The induction passage noise attenuator of claim 1, wherein the sonically porous filler material includes fiberglass strands. 9. An induction passage noise attenuator comprising: an outer first enclosure having a central axis, the outer first enclosure having an enclosure inside surface being a second radial distance from the central axis configured to be disposed upstream from a clean side air duct, the clean side air duct having a clean side air duct inner surface being a first radial distance from the central axis;an inner second enclosure open only on a downstream end where an outer surface of the inner second enclosure is separated from the inside surface of the outer first enclosure, the inner second enclosure housing a sonically porous material positioned between a series of frusto-conical surfaces, the series of frusto-conical surfaces of the same size and shape arranged in the inner second enclosure and having centers aligned with the central axis and angled outward in a downstream direction of engine intake airflow, outer edges of each of the series of surfaces being disposed at a third radial distance from the central axis, the third radial distance being substantially equal to, or greater than, the first radial distance and less than the second radial distance; andan air filter disposed with the outer first enclosure, and physically coupled adjacent to an upstream end of the inner second enclosure. 10. The induction passage noise attenuator of claim 9, wherein the third radial distance is substantially equal to the first radial distance. 11. The induction passage noise attenuator of claim 10, further comprising an enclosure inlet for receiving intake air, an annular passage located with the outer first enclosure downstream from the air filter and between the enclosure inside surface and radially outside the series of surfaces. 12. The induction passage noise attenuator of claim 9, wherein the sonically porous material substantially fills a space in a substantially homogeneous way. 13. The induction passage noise attenuator of claim 9, wherein the sonically porous material is arranged to vary in density along the inner second enclosure as measured in an axial direction. 14. A system comprising: an intake air passage for passing intake air to an engine including an upstream passage and a downstream passage, the downstream passage having a first inner diameter;a first enclosure fluidically coupled at an upstream side thereof to receive the intake air from the upstream passage and fluidically coupled at a downstream side thereof to pass the intake air to the downstream passage, the first enclosure having a second inner diameter bigger than the first inner diameter, and having a smaller cylindrical second enclosure open only at a downstream end and positioned within the first enclosure, the second enclosure positioned with the first enclosure such that intake air passes around the second enclosure within the first enclosure through a space between an exterior of the second enclosure and an interior of the first enclosure;a series of surfaces within the second enclosure, each surface of the series of surfaces having centers aligned with a central axis and the surfaces each being angled outward in a downstream direction of engine intake airflow and having an outer diameter greater than and substantially in line with the first inner diameter, and a sonically porous material positioned between each of the series of surfaces; andan air filter physically coupled adjacent to an upstream surface of the second enclosure. 15. A system, comprising: a cylindrical duct upstream of a compressor leading to an engine, the cylindrical duct including an air filter with a cylindrical interior opening coupled around a structural element upstream of a noise attenuating section, the noise attenuating section having, with the cylindrical duct, a cylindrical enclosure open only on a downstream side, the structural element coupled to an upstream surface of the cylindrical enclosure, the cylindrical enclosure housing a plurality of plates with holes therein angled outward in a downstream direction and spaced apart from one another in series with sonically porous material positioned within the cylindrical enclosure and between adjacent surfaces of the plurality of plates, the plates coupled to an interior surface of the cylindrical enclosure, with airflow passing around an exterior of the cylindrical enclosure en route to the engine.
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이 특허에 인용된 특허 (11)
McLean Ian R.,CAX, Active noise attenuation system.
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