Abstract:
Piezoelectric coefficient and permittivity of piezoelectric material varies
with variation in electric field. In this work, variation of piezoelectric
coefficient and permittivity of piezoelectric material with change in applied
electric field is considered while actively controlling vibrations of a plate
instrumented with piezoelectric patches. Variation of piezoelectric
coefficient and permittivity of piezoelectric material with electric field is
considered in finite element model of the smart plate. Kalman estimator is
used to estimate first three modal displacements and velocities of the
smart plate. Experiments are performed using Labview software for two
cases: In case 1 effect of electric field on piezoelectric coefficient and
permittivity of piezoelectric material is not included in Kalman estimator
and in case 2 this effect is considered in Kalman estimator. For the same
control gain, more control voltages get applied on the piezoelectric
actuator in case 1 as compared to case 2.
