Patent ID: 7992676

Claim:
A compact tuned acoustic attenuation device for an air induction system, comprising: a housing enclosing and defining a housing chamber within, said housing including a first end wall of said housing; a second end wall of said housing arranged on an opposing side of said chamber relative to said first end wall; a tubular air inlet channel arranged on and extending through said first end wall into said chamber with an open mouth of said air inlet channel protruding into said chamber at a first distance from said first end wall; an air outlet channel opening through said second end wall, said air outlet channel having an open mouth within said housing positioned to substantially face said open mouth of said air inlet channel, said inlet channel open mouth spaced at a second distance from said outlet channel to form an air gap therebetween, said second distance spacing placing said housing chamber in air flow communication with said inlet and outlet channels; and at least one acoustic chamber arranged within said housing chamber and positioned in a substantially lateral parallel relationship to said inlet channel at a position proximate to said first end wall, said at least one acoustic chamber enclosed by at least one side wall and a bottom wall defining an acoustic volume therein, said at least one acoustic chamber having an open end portion arranged facing said air gap in communication with said housing chamber, said at least one acoustic chamber having a depth defined by a distance between said bottom wall and said open end; wherein each of said at least one acoustic chambers has at least one of its volume and depth selected to provide a desired acoustic attenuation at a selected frequency and bandwidth of noise entering said housing chamber; and wherein at least a portion of said at least one acoustic chambers are configured to operate as quarter wave tuners.