II. How To Use ATILA

3.4 Cymbal (2)
BOUNDARY CONDITIONS MESHING


PROBLEM - Cymbal 12 mm f x 2.4 mm t (Metal thickness 0.2 mm, PZT thickness 0.5 mm x two layer, Cavity hight 0.5 mm)


BOUNDARY CONDITIONS
Polarization/Local Axes

High voltage should be applied on the center surface of the PZT two layers, and Ground on the metal endcap. Choose the polarization direction along the electric field direction.

Data -> Conditions -> Volumes -> 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 volume -> Finish

Potential

Data -> Conditions -> Surfaces -> Potential 0.0 (or Ground in ATILA 5.2.4 or higher version) -> Assign the top surface of the PZT -> Forced Potential 1.0 -> Assign the bottom surface

Surface Contraints (1/8 part of the whole Cymbal)

We use only 1/8 part of the whole Cymbal, taking into account the symmetry; the bottom surface of the PZT disk - Z compoent is clamped, while X and Y components are free.

Data -> Conditions -> Surfaces -> Surface Constraints -> Z components -> Clamped -> Assign the bottom PZT surfaces

Similarly, the edge on the X axis -> Surface Contstraints -> Y components -> Clamped -> Assign

The edge on the Y axis -> Surface Contraints -> X components -> Clamped -> Assign

To check the assignment -> Draw -> All conditions -> Include local axes

MESHING

Cant view is not very suitable to Meshing -> View -> Rotate -> Plane xy (original)

Mapped Mesh

Meshing -> Structured -> Volumes -> Select all volumes -> Then Cancel the further process
Meshing -> Structured -> Lines -> Enter number to divide line -> Choose "1" for the lines -> Generate

Use the higher number such as 2 or 4 for the higher accurate calculation.