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:
Jun. 04, 2013
Filed:
Oct. 22, 2009
Peter Russhard, Nottingham, GB;
Peter Russhard, Nottingham, GB;
Rolls-Royce PLC, London, GB;
Abstract
A method for analysing blade displacements detected by circumferentially-spaced stationary timing probes associated with a rotating blade assembly, the displacements corresponding to times at which the blades pass the probes. The method includes identifying resonant vibration events in the assembly by: for detected blade displacement detected by a probe, determining an associated running average blade displacement from a predetermined number of blade displacements detected by that probe for the same blade at adjacent rotations, and subtracting the associated running average blade displacement from the blade displacement to calculate a corresponding zeroed blade displacement; determining, for successive rotations, correlation factors that quantify the degree of correlation between the zeroed blade displacements for a particular blade on a particular rotation and modelled blade displacements corresponding to possible blade vibrational deflections on that rotation; and identifying a resonant vibration event on a rotation when one or more correlation factors cross a predetermined threshold.