Apparatus and method for reducing engine noise

摘要

A side-branch resonator which has a resonator chamber connected to an air intake pipe with two necks. The necks extend into the resonator chamber and provide a conduit for sound to travel to and from the air intake pipe. The presence of two necks increases the magnitude of attenuation at the resonant frequency and the bandwidth of attenuation of other lower frequency engine noises. The two necks also effectively attenuate higher frequencies by utilizing standing waves found within the resonator chamber.