II. How To Use ATILA

5.1 L-Shape USM (2)
BOUNDARY CONDITIONS MESHING


PROBLEM - L-Shape USM

2 Legs: 8 mm L x 2 mm W x 1 mm t
Corner: 2 mm x 2 mm x 1 mm t (PZT4)
Clamped at two leg ends

 


  • Learn the ultrasonic motor principle - Generate an elliptical locus
  • Learn how to apply sine & cosine voltages simultaneously

BOUNDARY CONDITIONS
Polarization/Local Axes

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 all three volumes -> Finish

Potential

Data -> Conditions -> Surfaces -> Electric Potential -> Ground -> Assign the bottom two surfaces of the PZT

Data -> Conditions -> Forced Potential 1.0 with phase 0 -> Assign the top right-side surface
Data -> Conditions -> Forced Potential 1.0 with phase 90 -> Assign the top lest-side surface

This is the way how to apply sine & cosine on the PZT plates.

Surface Contraints (Two "Leg" ends are clampled)

Data -> Conditions -> Surfaces -> Surface Constraints -> X, Y and Z components -> Clamped -> Assign the PZT Leg End surfaces

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, 2 and 4" for the lines -> Generate