Patent ID: 6792907
Filing Date: 2004-09-21
Classification: F01N,G10K

Abstract:
A variable tuned resonator comprising:a housing having a chamber formed therein and a neck portion adapted to provide fluid communication between the chamber and a duct; an engine speed sensor adapted to sense a speed of an associated engine; control means coupled to said engine speed sensor for controlling at least one of a volume of the chamber, a length of the neck portion, and a diameter of the neck portion responsive to the speed sensed by said engine speed sensor, wherein controlling at least one of the volume of the chamber, the length of the neck portion, and the diameter of the neck portion tunes attenuation to a desired frequency of sound in the duct; a noise sensor responsive to noise within said duct; a vibratory displacement actuator disposed in the chamber of said housing, said vibratory displacement actuator for creating a vibratory input responsive to noise parameters sensed by said noise sensor, wherein the vibratory input cancels a desired frequency of sound in the duct.