Vibration limiting of rotating machinery through active control

Details Vibration limiting of rotating machinery through active control Vibration limiting of rotating machinery through active control

1984-11-09

1987-02-17

Levy, Stuart S.

Bearings

Rotary bearing

Fluid bearing

384 99, 384114, 384117, 384247, 384311, 384448, F16C 2702, F16C 3206, F16C 2304, F16C 1703

Patent

active

046435921

ABSTRACT:
Unwanted vibrations in rotating machinery are controlled from an "active" point of view, meaning, that certain parameters, and thereby vibrations, can be controlled while the machine is operating. This is accomplished from the theoretical knowledge known about rotor dynamics, mechanical vibrations, automatic controls, fluid dynamics, and bearing design theory to produce an active remedy to fundamental vibration problems. From the known information about the critical speeds of a machine and while the speed transients are occuring, active controls cause these critical speeds to be made variable and always away from the actual running speed. By this means, the machine does not have to "run through" the critical speeds but rather, the critical speeds are jumped over by control of certain parameters. This approach is novel but may be accomplished by several different techniques, of which a variety are presented herein.
It is recognized that this invention is not obvious are therefore may be, at first glance, thought to circumvent certain laws of physics. This is not the case, rather, it makes use of the subtleties of the laws of physics that generally go unnoticed.

REFERENCES:
patent: 2733857 (1956-02-01), Beams
patent: 2947471 (1960-08-01), Beams et al.
patent: 2948572 (1960-08-01), Beams et al.
patent: 2961277 (1960-11-01), Sternlicht
patent: 3124395 (1964-03-01), Sternlicht
patent: 3537943 (1970-11-01), Moser et al.
patent: 3560064 (1971-02-01), Silver
patent: 3617102 (1971-11-01), Wada et al.
patent: 4119375 (1978-10-01), Kirk et al.
patent: 4193644 (1980-03-01), Miyashita
patent: 4512671 (1985-04-01), Giers et al.
patent: 4514123 (1985-04-01), Johnstone et al.
William T. Thomson, Vibration Theory and Applications, 3rd Ed., Englewood, Cliffs, N.J., Prentice Hall, Inc., 1965, pp. 86, 183, 194.
Helmut Haberman & Maurice Brunet, "The Active Magnetic Bearing Enables Optimum Damping of Flexible Rotor", Societe DeMecanique Magnetique, B.P., 431, Vernon, France, ROMAC Short Course, Un. of Virginia 1984.
R. Holms & M. Dogan, "Investigation of Squeeze Film Dampers in Flexible Support Structures", NASA Conf. Pub. 2250, May 10-12, 1982, pp. 415-433.
Jorgen Tonnesen, "Experimental Squeeze Bearing Orbit Studies", Proceedings of the Conference on the Stability and Dynamic Response of Rotors with Squeeze Film Bearings, U.S. Army Research Office, Research Triangle Park, NC, May 8-10, 1979, pp. 83-95.

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