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:
Aug. 04, 2015
Filed:
Apr. 27, 2010
Applicants:
Richard V. Brooks, Derby, GB;
John Coupland, Derby, GB;
Inventors:
Richard V. Brooks, Derby, GB;
John Coupland, Derby, GB;
Assignee:
ROLLS-ROYCE PLC, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01D 25/04 (2006.01); F02C 7/045 (2006.01); F02C 7/24 (2006.01); F01D 5/26 (2006.01);
U.S. Cl.
CPC ...
F02C 7/045 (2013.01); F01D 5/26 (2013.01); F01D 25/04 (2013.01); F02C 7/24 (2013.01); F05D 2260/96 (2013.01); F05D 2260/963 (2013.01); Y02T 50/671 (2013.01); Y02T 50/673 (2013.01);
Abstract
Fan flutter attenuators are optimized so that they occupy the minimum area of the intake duct, and so can be accommodated more easily, without significantly compromising the area available for liners targeting community noise. In such circumstances resonators for flutter frequencies are typically associated with existing acoustic liner and take the form of chambers incorporating labyrinthine cores for absorption of acoustic frequency waves or utilize Helmholtz chambers with appropriate volumes and inlet pipe aperture configurations for tuning to desired flutter frequencies to be attenuated.