The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 2000
Filed:
Sep. 24, 1998
Applicant:
Inventors:
Ricardo A Burdisso, Blacksburg, VA (US);
Jerome P Smith, Blacksburg, VA (US);
Assignee:
Virginia Tech Intellectual Properties, Inc., Blacksburg, VA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02K / ;
U.S. Cl.
CPC ...
602261 ; 181250 ; 181213 ;
Abstract
An array of adaptive or fixed Herschel-Quincke tubes aligned in a circumferential or helical array about an inlet of a turbofan engine. The array of tubes effectively divide the acoustic energy generated by the engine. One of the energy components propagates within the tubes while the other propagates within the engine compartment. At some time certain, the acoustic energy in the tubes is reintroduced into the engine compartment to cancel the acoustic energy remaining in the engine as it propagates from the fan towards the inlet and outlet openings.