II. How To Use ATILA

7. Acoustic Lens (2)
PROBLEM TYPE VIEW RESULTS


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 ) with an Rubber Acoustic Lens; 2D Axisymmetric with 1/2 portion

  • Learn how to use an acoustic lens
  • Check the Beam Patter / Directivitiy
PROBLEM TYPE
Data -> Problem data -> 2D, Axisymmetric, Harmonic, Click both Compute Stress and Include Losses

FREQUENCY


Data -> Harmonic -> Interval 1 (20000-100000 Hz), Interval 2 (45000-55000 Hz), Interval 3 (80000-90000 Hz)

CALCULATION
Calculate -> Calculate window -> Start

POST PROCESS/VIEW RESULTS
Click for Opening the Post Calculation (Flavia) Domain
Click Admittance/Impedance Result
Admittance Peak Point : 50 kHz -> These peak corresponds to the First split Resonances

Admittance Curve with a lens (50000 Hz): Damped compared to the pure Langevin Transducer.
Admittance Curve without a lens (51000 Hz)

View Animation - Vibration Mode at a Particular Frequency

View results -> Default Analysis/Step -> Harmonic-Magnitude -> Set a Frequency
(Peak Point : 50000 Hz for the Resonance Mode)
Double Click Loading frequency: 50000 Hz Harmonic Case -> Click OK (Single Click and Wait for a while!)

Set Deformation -> Displacement
View results -> Deformation -> Displacement

Other parameter than Displacement
Set Results View -> View results -> Contour Fill -> Von Mises Stress
After setting both “Results view” and “Deformation” -> Click to see the Animation

50000 Hz

Wider Beam

52000 Hz

Narrower Beam

51000 Hz - First Lower Resonance