Predominance of resonance in expansion-cavity-type muffler with flow (2nd report, generalization of predominance phenomena of tail pipe rosonance)

摘要

Predominant resonance can occur in flow-induced noise from an expansion-cavity-type muffler for particular combinations of muffler configuration and flow velocity. This phenomenon is caused by self-excited oscillation based on the feedback response from acoustic resonances of the muffler to shear flow. Usually, the sound pressure level is much higher when predominance of tail pipe resonance rather than cavity resonance occurs.