BOUNDARY
CONDITIONS
Polarization/Local
Axes
Data -> Conditions -> Surfaces -> Geometry -> Polarization
(Cartesian) -> Define Polarization (P1) (0,0,-1) direction
Choose 3PointsXZ -> Center (0,0,0) -> Define X axis
by putting (1,0,0) -> Then define Z axis by putting (0,0,-1)
-> Escape
Assign Polarization (Local-Axes P1) -> Choose the PZT
all four surfaces -> Finish
Potential
Data -> Conditions -> Lines -> Electric Potential
-> Ground -> Assign the four lines of the
PZT bonded on the Brass
Data -> Conditions -> Forced Potential 1.0 with phase
0 -> Assign the top left-side and bottom right-side surfaces
Data -> Conditions -> Forced Potential 1.0 with
phase 90 -> Assign the top right-side and bottom left-side
surfaces
This is the way how to apply sine & cosine
on the PZT plates.
MESHING 
Mapped Mesh
Meshing -> Structured -> Surfaces -> Select
all surfaces -> Then Cancel the further process
Meshing -> Structured -> Lines -> Enter number to divide
line -> Choose "2,
4, 6" for
the lines -> Generate