Electricity: motive power systems – Positional servo systems – Adaptive or optimizing systems including 'bang-bang' servos
Patent
1989-07-03
1990-08-21
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Adaptive or optimizing systems including 'bang-bang' servos
318640, 318649, 267136, 267225, G05B 1300
Patent
active
049509667
ABSTRACT:
A method and apparatus for cancelling vibrations caused by periodic pulsating forces acting on a rotating shaft which are synchronous with the shaft rotation. An adaptive algorithm is implemented which utilizes the sensed velocity or acceleration of the difference between the pulsting forces acting on the shaft and an applied control force to generate an estimate of the phase shift existing therebetween to adjust a pair of adaptive weighting coefficients for sine and cosine force components which are adjusted by a least mean square (LMS) algorithm. Actuating signals for the reaction mass actuator are generated from the weighted force components which applies a controlled force to the shaft to oppose the shaft pulsation force and thus cancel the vibration.
REFERENCES:
patent: 4083433 (1978-04-01), Geohegan
patent: 4232364 (1989-11-01), Bibbero
patent: 4351515 (1982-09-01), Yoshida
patent: 4643592 (1987-02-01), Lewis et al.
patent: 4796873 (1989-01-01), Schubert
"Stationary and Nonstationary Learning Characteristics of the LMS Adaptive Filter", Widrow, et al., Proceedings of the IEEE, vol. 64, No. 8, Aug. 1976, pp. 1151-1162.
Bergmann Saul M.
Shoop Jr. William M.
Westinghouse Electric Corp.
Williamson J. K.
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