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:
Nov. 12, 2013
Filed:
Jul. 20, 2010
Gilles Herpin, Lan Con, FR;
Gilles Herpin, Lan Con, FR;
Eurocopter, Marignane Cedex, FR;
Abstract
The present invention relates to a method of reducing the vibration of a lift and propulsion rotor () of a rotorcraft (), the rotor having a plurality of airfoil assemblies () that perform rotary movement around a drive axis (AX) of the rotor (), each airfoil assembly () comprising a blade () extending longitudinally from a root () suitable for being fastened to hinge means () of a hub () of said rotor () to a free end (), a first distance (D) extending between said free end () and said hinge means (). In the method, said first distance (D) is caused to vary cyclically so that the projection (TR) of the center of gravity (Cg) of a blade () on a horizontal plane (P) perpendicular to said drive axis (AX) and containing said hinge means () describes a circle.