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:
Mar. 17, 2020
Filed:
Apr. 30, 2019
Applicant:
Rolls-royce Plc, London, GB;
Inventors:
Alastair D Moore, Derby, GB;
Robert J Telling, Derby, GB;
Assignee:
ROLLS-ROYCE PLC, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01M 15/14 (2006.01); F02C 7/24 (2006.01); F02C 7/32 (2006.01); F02K 3/06 (2006.01);
U.S. Cl.
CPC ...
F02C 7/24 (2013.01); F02C 7/32 (2013.01); F02K 3/06 (2013.01); G01M 15/14 (2013.01); F05D 2260/83 (2013.01); F05D 2260/96 (2013.01);
Abstract
A gas turbine engine generates noise during use, and one particularly important flight condition for noise generation is take-off. A gas turbine engine has high efficiency together with low noise, in particular from the turbine that drives the fan. The contribution of the turbine noise emanating from the rear of the engine to the Effective Perceived Noise Level (EPNL) is in the range of from 7 EPNdB and 30 EPNdB lower at a take-off lateral reference point than at an approach reference point.