System for wide bandwidth damping

Details System for wide bandwidth damping System for wide bandwidth damping

1985-02-11

1987-01-06

Reger, Duane A.

Brakes

Internal-resistance motion retarder

Magnetic fluid or material

188379, 318460, F16F 1503

Patent

active

046339825

ABSTRACT:
A positive electronic feedback circuit for mechanical vibration damping. The feedback circuit is connected from an output transducer fixed to a vibratable structure to an input transducer fixed to the structure. Preferably the feedback circuit has an output signal with a phase about 90 degrees lagging its input signal. Three conditions set forth herein make this possible.

REFERENCES:
patent: 2416337 (1947-02-01), Mason
patent: 2443471 (1948-04-01), Mason
Forward, "Electronic Damping of Orthogonal Bending Modes in a Cylindrical Mast-Experiment" AIAA-81-4018.
Swigert et al., "Electronic Damping of Orthogonal Bending Modes in a Cylindrical Mast-Theory" AIAA 81-4017.
Rockwell et al., "Theoretical and Experimental Results on Active Dampers", The Journal of the Acoustical Society of America, vol. 36, #8, Aug. 84, pp. 1507-1515.
Forward et al., The Shock and Vibration Bulletin, No. 53, Part 4, May 1983.

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