Harris Corporation

United Technologies Corporation

Rtx Corporation

Dave Hyland

Zhongtao Dai

Lexia Kironn

Russell B Hanson

John Warner Shipley

Kristin Kopp-Vaughan

Douglas J Phillips

Gerry Edward Riveros

S Greeley

S Richter

Keith E Kessler

An active isolation device and method reduces the transmission of vibrations from interconnected elements. The device maintains a high stiffness between interconnected elements while actively reducing the transmission of relative movements, such as vibration. In one embodiment, the device uses accelerometers to measure the vibrations experienced by each of the interconnected elements and selectively operates an actuator between the two elements to maintain the position of one of the elements. In another embodiment, plural of the devices are used cooperatively to reduce the vibrations that would otherwise be transmitted from one element to a platform, permitting simultaneous control of multiple degrees of freedom of movement.

Vibration isolation system using plural signals for control

A high precision linear actuator for compensating short stroke, high frequency vibrations in a space deployed structure comprises a set of cylindrical magnetic pole pieces affixed to respective ones of a pair of graphite flexures, that are mounted to a thermally conductive cylindrical housing, which is to be affixed to the space deployed structure. Reaction against the 'proof mass' pole pieces is achieved by a magnetic field produced by set of stationary magnetic coils that surround the pole pieces and are energized by a vibration compensation reaction current supplied from a sense/control processor. Coaxial with and mounted integrally with the cylindrical pole pieces of the proof mass is an internal accelerater, which generates an output signal representative of the force to which the proof mass is subjected. This output signal is monitored by the sense/control processor to close a force feedback loop and effectively reduce both the inherent resonance imparted by the spiral support flexures and non-linearities in the magnetic field, against which the 'proof mass' cylindrical pole pieces react in the course of operation of the actuator. The vibration compensation drive signal that is supplied by the sense/control processor may be based upon the output of a second accelerometer that is mounted integrally with the cylindrical housing, but external to the flexures, by way of which the 'proof mass' pole pieces, associated drive coils and internal accelerometer are supported.

Linear precision actuator with accelerometer feedback

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Melbourne Beach, FL, United States of America

Dave Hyland