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:
Jul. 15, 2008
Filed:
Apr. 13, 2005
Ian C D Care, Derby, GB;
Alison J Mcmillan, Uttoxeter, GB;
Seamus Garvey, Notttingham, GB;
Rolls-Royce plc, London, GB;
Abstract
A blade arrangementincludes an array of radially extending blades, which may for example comprise a fan of a gas turbine engine for an aircraft. The bladesare mounted for rotation about a central axis X-X. The blade arrangementfurther includes a damping arrangementcomprising meansfor inducing an axi-symmetric magnetic field whose axis of symmetry coincides with the central axis X-X of rotation of the blades. The damping arrangementis configured such that when the magnetic field is induced, any movement of the bladeother than pure rotation about the central axis results in the magnetic field causing a force to be exerted on the blade, the force resisting such movement. The damping arrangement may be provided with means for inducing the magnetic field only when there is an increased likelihood of vibration of the blades, for example when a foreign body has entered the air intake of the engine.