II. How To Use ATILA

6.1 Langevin Type Transducer (1)
GEOMETRY/DRAWING MATERIAL ASSIGNMENT


PROBLEM - Langevin Transducer 50 mm f x 40 mm t (Two PZT 8 disks with 50 mm f x 1 mm t are sandwiched by two Steel 1 blocks with 50 mm f x 19 mm thickness ); 2D Axisymmetric with 1/2 portion

  • Simplest underwater transducer
  • Learn how to use a small sample to a low frequency applicaiton
  • Learn the underwater sound propagation

GEOMETRY/DRAWING

Create Surface
Geometry -> Create -> Object -> Rectangle -> Enter First and Second Corner Points -> 0,0 ; 20,25
Divide Surface
Geometry -> Edit -> Divide -> Surface -> Near point -> Select Surface to Divide -> Choose NURBS sense -> VSense -> Near point 1,0

Create Water Area
Geometry -> Create -> Arc -> First, Second and Third points -> 80,0; 0,80; -80,0
Geometry -> Edit -> Divide -> Num Divisions -> Select line -> Num Divisions 2
Delete -> Line and point
Then, Geometry -> Create -> Line

Divide the Water Surface

In order to simplify the meshing in the Water area (small number of mesh), we will use the water surface area division technique.

Geometry -> Edit -> Divide -> Num Divisions -> Select line -> Num Divisions 3
Then, Geometry -> Create -> Line
Geometry -> Create -> NUEBS surface -> Automatic -> 4-sided lines

MATERIAL ASSIGMENT
Piezoelectric Materials

Data -> Materials -> Piezoelectric -> PZT8 -> Assign -> Pick Surface

Elastic Materials

Data -> Materials -> Elastic -> Steel 1-> Assign -> Pick Surface

Fluid Materials

Data -> Materials -> Fluid -> Water-> Assign -> Pick Surface

Click Draw -> All materials -> Check the material are assigned as PZT8, Steel 1 and Water

  • Note that this 1/2 part is enough for the simulation, as long as we will consider the symmetrical mode.