Abstract:
Piezoelectric coefficient and dielectric constant of
PZT-5H vary with electric field. In this work, variations of
these coefficients with electric field are included in finite
element modelling of a cantilevered plate instrumented with
piezoelectric patches. Finite element model is reduced using
modal truncation and then converted into state-space. First
three modal displacements and velocities are estimated using
Kalman observer. Negative first modal velocity feedback is
used to control the vibrations of the smart plate. Two cases are
considered: 1. In which variation of piezoelectric coefficient
and dielectric constant is considered in Kalman observer 2. In
which variation of piezoelectric coefficient and dielectric
constant is not considered in Kalman observer. Simulation
results show that appreciable amount of error in simulation
would be present if variation of these coefficients with r.m.s.
value of electric field is ignored.
