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II. How To Use ATILA 7.
Acoustic Lens (1)
GEOMETRY/DRAWING Create Surface Create Lens Create Water Area MATERIAL
ASSIGMENT BOUNDARY CONDITIONS ![]() High voltage should be applied on the center surface of the PZT two layers, and Ground on the metal side surface. Choose the polarization direction along the electric field direction. Data -> Conditions -> Surfaces -> Geometry -> Polarization (Cartesian) -> Define Polarization (P1) (1,0) direction Choose 3PointsXZ -> Center (0,0,0) -> Define X axis by putting (0,1,0) -> Then define Z axis by putting (1,0,0) -> Escape Assign Polarization (Local-Axes P1) -> Choose the PZT surface -> Finish
Data -> Conditions -> Lines -> Potential 0.0 (or Ground in ATILA 5.2.4 or higher version) -> Assign the right-side line of the PZT -> Forced Potential 1.0 -> Assign the left-side line of the PZT (which is the center surface of the two PZT plates)
We use only 1/2 part of the whole Langevin transducer, taking into account the symmetry; the left-side line of the PZT and water should be clamped (X component is clamped) The bottom axisymmetric line of the whole system (including water) - Y component is clamped. The axisymmetric axis is taken along x axis (This is the rule in ATILA). Data -> Conditions -> Lines -> Line Constraints -> X components -> Clamped -> Assign the left-side PZT and Water lines Similarly, on the Axisymmetric X axis -> Line Contstraints -> Y & Z components -> Clamped -> Assign
Data -> Conditions -> Lines -> Line Constraints -> X components -> Clamped -> Assign the left-side PZT and Water lines Radiation boundary is applied not to reflect the water-propagating sound at this boundary (like an anechoic wall). In this sense, the radius of this water boundary is not essential. To check the assignment -> Draw -> All conditions -> Include local axes MESHING Mapped Mesh Meshing -> Structured -> Surfaces -> Select all
Surfaces -> Then Cancel the further process
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