Patent ID: 6752240
Filing Date: 2004-06-22
Classification: F01N,F02B,F02M

Abstract:
A sound attenuating system, comprising:an airflow conduit having an inlet end and an outlet end; a first chamber disposed proximate a first portion of said airflow conduit, said first chamber having a first length; a first plurality of holes formed through said first portion of said airflow conduit, said first plurality of holes being in fluid communication between said airflow conduit and said first chamber, wherein said first length and the size of each of said first plurality of holes are selected to be compatible with each other in attenuating a first range of frequencies of sound, which are passing through said airflow conduit; a second chamber disposed proximate a second portion of said airflow conduit, said second chamber having a second length; and a second plurality of holes formed through said second portion of said airflow conduit, said second plurality of holes being in fluid communication between said airflow conduit and said second chamber, wherein said second length and the size of each of said second plurality of holes are selected to be compatible with each other in attenuating a second range of frequencies of sound, which are passing through said airflow conduit.