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:
Aug. 21, 1990
Filed:
Jul. 03, 1989
Clinton W Moulds, III, Millersville, MD (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A method and apparatus for cancelling vibrations caused by periodic pulsating forces acting on a rotating shaft which are synchronous with the shaft rotation. An adaptive algorithm is implemented which utilizes the sensed velocity or acceleration of the difference between the pulsting forces acting on the shaft and an applied control force to generate an estimate of the phase shift existing therebetween to adjust a pair of adaptive weighting coefficients for sine and cosine force components which are adjusted by a least mean square (LMS) algorithm. Actuating signals for the reaction mass actuator are generated from the weighted force components which applies a controlled force to the shaft to oppose the shaft pulsation force and thus cancel the vibration.