Patent ID: 8617454

Claim:
A method for attaching a resonator to an airflow, comprising: (A) forming the resonator comprising: forming a sleeve insert having: a wall, a first aperture in the wall at a first axial distance, a second aperture in the wall at a second axial distance, and a rib having a proximal end at the wall of the sleeve insert and extending outwardly from the wall and terminating at a distal end vertically displaced from the wall, the rib being located between the first and second apertures; and inserting the formed sleeve insert into an outer duct; bonding the outer duct to the sleeve insert to points on the sleeve insert wall at first and second ends of the sleeve insert and at the distal end of the outwardly extending end of the rib vertically displaced from the points on the sleeve insert wall and with ends of the outer duct extending outwardly beyond ends of the sleeve insert forming the resonator with: a first toroidal cavity disposed between the sleeve insert and the outer duct at a location proximate the first aperture, the first aperture providing an entrance to an interior region of the first toroidal cavity; a second toroidal cavity disposed between the sleeve insert and the outer duct at a location proximate the second aperture, the second aperture providing an entrance to an interior region of the second toroidal cavity; and the outwardly extending rib forming a common sidewall separating the interior region of the first toroidal cavity from the interior region of the second toroidal cavity; (B) coupling the one of the outwardly extending ends of the outer duct of the resonator to the exhaust manifold.