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:
May. 11, 1999
Filed:
Feb. 19, 1998
Kenneth D Garnjost, Buffalo, NY (US);
Gonzalo J Rey, Batavia, NY (US);
Moog Inc., East Aurora, NY (US);
Abstract
A modular vibratory force generator (10) is adapted to be mounted on a helicopter fuselage (11) and operated to selectively apply a controllable vibratory force (F.sub.R) thereto. The improved generator includes a plurality of force-generating modules (12, 12) and a closed-loop servocontroller (13). Each module has a pair of counter-rotating eccentric masses (20, 21) that are arranged to exert a fixed-amplitude variable-phase individual force at spaced locations on the fuselage. These individual forces (F.sub.1, F.sub.2) combine to exert a controllable-amplitude resultant vibratory force (F.sub.R) on the structure. The servocontroller is adapted to be supplied with a single sinusoidal control signal and is operative to cause the frequency and phase of the resultant vibratory force to be identical to the frequency and phase of the control signal and to cause the amplitude of the resultant vibratory force to be proportional to the amplitude of the control signal.