Patent ID: 6427815
Filing Date: 2002-08-06
Classification: B64C

Abstract:
A device for reducing vibrations of a. structure along a vibration propagation axis comprising an elongate spring having a central region with a connection for a structure for reducing vibration of said structure, two vibrating bodies each disposed at one of two opposite end portions of the spring, means for measuring movements of each of the vibrating bodies with respect to the central region of the spring, phase detectors for measuring phase difference between the movements of each of the vibrating bodies and the central region of the spring respectively, an amplitude controller for measuring amplitude difference between the movements of the vibrating bodies at the end portions of the spring and means for modifying resonance characteristics of an assembly of the spring and the vibrating bodies to reduce vibrations in the structure as a function (1) of a measured phase difference between the respective movements at the vibrating bodies and the movement at the central region of the spring and (2) of the amplitude difference between the movements of the vibrating bodies at the end portions of the spring.