Patent
Exhaust control method and apparatus
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TLDR
An exhaust control method and apparatus for controlling the exhaust flow of an internal combustion engine to increase engine efficiency and power while suppressing the sound of the exhaust by both absorbing and canceling sound waves is described in this article.Abstract:
An exhaust control method and apparatus for controlling the exhaust flow of an internal combustion engine to increase engine efficiency and power while suppressing the sound of the exhaust by both absorbing and canceling sound waves.read more
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References
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Muffler for internal combustion engine
TL;DR: In this paper, a converging-diverging nozzle and a length of perforated tubing are axially disposed in a cylindrical casing, projecting forwardly from the muffler outlet and defining alternate flow passages.
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Silencer for suction or discharge of fluids under pressure
TL;DR: In this paper, a silencer is made up of a combination of concentric outer, intermediate, and inner shells respectively having shapes of hollow truncated cones with specific divergent angles in the discharge direction and provided on both surfaces or single surfaces thereof with sound absorbing layers of specific thicknesses.
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Low backpressure straight through muffler
TL;DR: A low backpressure straight through type sound attenuating muffler as discussed by the authors was adapted particularly for use with internal combustion engines, which comprises a series of spaced annular bodies of sound deadening material, the inner diameters of which defined a gas flow path and the side faces of which define chambers within the muffler housing.