Title page for ETD etd-8897-171952

Type of Document Master's Thesis
Author Fannin, Christopher A.
Author's Email Address cfannin@vt.edu
URN etd-8897-171952
Title Design of an Analog Adaptive Piezoelectric Sensoriactuator
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Cudney, Harley H.
Wicks, Alfred L.
Saunders, William R. Committee Chair
  • piezoelectric
  • collocated
  • smart structure
  • LMS algorithm
  • system ID
Date of Defense 1997-02-26
Availability unrestricted
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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