Communications Project

Document Type:Master's Thesis
Name:Christopher A. Fannin
Title:Design of an Analog Adaptive Piezoelectric Sensoriactuator
Degree:Master of Science
Department:Mechanical Engineering
Committee Chair: William R. Saunders
Committee Members:
Keywords:piezoelectric, collocated, smart structure, LMS algorithm, system ID
Date of defense:February 26, 1997
Availability:Release the entire work for Virginia Tech access only.
After one year release worldwide only with written permission of the student and the advisory committee chair.


In order for a piezoelectric transducer to be used as a sensor and actuator simultaneously, a direct charge due to the applied voltage must be removed from the total response in order to allow observation of the mechanical response alone. Earlier researchers proposed electronic compensators to remove this term by creating a reference signal which destructively interferes with the direct piezoelectric charge output, leaving only the charge related to the mechanical response signal. This research presents alternative analog LMS adaptive filtering methods which accomplish the same result. The main advantage of the proposed analog compensation scheme is its ability to more closely match the order of the adaptive filter to the assumed dynamics of the piezostructure using an adaptive first-order high-pass filter. Theoretical and experimental results are provided along with a discussion of the difficulties encountered in trying to achieve perfect compensation of the feedthrough capacitive charge on a piezoelectric wafer.

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