ACOUSTIC QUARTER WAVE TUBE ABSORBER

摘要

An intake system for an internal combustion engine is disclosed having an intake air duct for transferring intake air to the engine. The inlet air duct has a quarter-wave acoustical tuner in operable communication with the intake air flow to attenuate sound frequencies in the duct. The quarter-wave tuner has a first, opened end which communicates with the air flow, a tubular body and a second end which is closed by a moveable diaphragm. The diaphragm is moveable under the force of a sound wave traversing the tuner and is operable to extend the attenuation range of the tuner.