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:
Dec. 10, 2019
Filed:
Nov. 23, 2015
Snecma, Paris, FR;
Laurent Louis Robert Baudoin, Paris, FR;
Georges Jean Xavier Riou, Melun, FR;
SAFRAN AIRCRAFT ENGINES, Paris, FR;
Abstract
The invention relates to an aircraft turbofan type engine () comprising an air intake duct () having an inner face provided with an acoustic attenuation shroud () located upstream from a fan () of this engine (). This acoustic attenuation shroud () comprises a regular alternation of first portions and second portions with different first and second thicknesses along the radial direction, the number of alternations being greater than twice the number of passing azimuth acoustic vibration modes occurring in the engine () without the acoustic attenuation shroud () operating under conditions corresponding to a landing phase and a take-off phase.