Adaptive piezoelectric sensoriactuator

Details Adaptive piezoelectric sensoriactuator Adaptive piezoelectric sensoriactuator

1995-08-25

1996-11-26

Raevis, Robert

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specified electrical sensor or system

310319, G01B 716

Patent

active

055787614

ABSTRACT:
An adaptive algorithm implemented in digital or analog form is used in conjunction with a voltage controlled amplifier to compensate for the feedthrough capacitance of piezoelectric sensoriactuator. The mechanical response of the piezoelectric sensoriactuator is resolved from the electrical response by adaptively altering the gain imposed on the electrical circuit used for compensation. For wideband, stochastic input disturbances, the feedthrough capacitance of the sensoriactuator can be identified on-line, providing a means of implementing direct-rate-feedback control in analog hardware. The device is capable of on-line system health monitoring since a quasi-stable dynamic capacitance is indicative of sustained health of the piezoelectric element.

REFERENCES:
patent: 5347870 (1994-09-01), Dosch et al.
Cole, D. G., et al., "Adaptive Compensation of Piezoelectric Sensoriactuators," Journal of Intelligent Material Systems and Structures, vol. 5:665-671 (Sep. 1994).
Vipperman, J. S., et al., "Hybrid Analog and Digital Adaptive Compensation of Piezoelectric Sensoriactuators," Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina, pp. 1-8 (Sep. 1995).

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