II. How To Use ATILA

6.2 Underwater Cymbal (3)
PROBLEM TYPE VIEW RESULTS


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); 2D Axisymmetric with a full portion

  • An underwater transducer
  • Learn the underwater sound propagation - Monopole & Dipole

PROBLEM TYPE

Data -> Problem data -> 2D, Axisymmetric, Harmonic, Click both Compute Stress and Include Losses

FREQUENCY

Data -> Harmonic -> Interval 1 (20000-30000 Hz), Interval 2 (23-25 kHz)

CALCULATION

Calculate -> Calculate window -> Start

POST PROCESS/VIEW RESULTS

Click for Opening the Post Calculation (Flavia) Domain

Click Admittance/Impedance Result

To find the exact resonance frequency, Click "Show Values".

Admittance Peak Point : 24000 Hz -> This peak corresponds to the First Resonance

Admittance Curve for Underwater Cymbal
Compared to the no-load Cymbal Impedance curve (see the right figure), water load dropps both the resonace frequency and Qm
 
Admittance Curve for Air Cymbal

View Animation - Vibration Mode at a Particular Frequency

View results -> Default Analysis/Step -> Harmonic-Magnitude -> Set a Frequency
(Peak Point : 24000 Hz for Resonance Mode)
Double Click Loading frequency: 24000 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 Lines -> Fluid Pressure
After setting both “Results view” and “Deformation” -> Click to see the Animation
24000 Hz - Resonance

Transmitting Voltage Ratio (TVR) [as a function of frequency]

Beam Pattern [as a function of angle]