II. How To Use ATILA

5.2 P-Shape USM (4)
PROBLEM TYPE : 2D and 3D


PROBLEM - L1B4 Type USM 2D and 3D Models :

Brass Bar L = 46 mm, t = 2.5 mm
Leg L = 10 mm, t = 2 mm
PZT 4 L = 11.5 mm, t = 1 mm

  • Learn the difference between the 2D and 3D models.
2D model
3D model

PROBLEM TYPE

Data -> Problem data -> 2D or 3D, Harmonic, Click both Compute Stress and Include Losses

Choose Class = PLSTRAIN in the 2D case.

CALCULATION

Calculate -> Calculate window -> Start

POST PROCESS/VIEW RESULTS

Click for Opening the Post Calculation (Flavia) Domain
Click Admittance/Impedance Result
2D Result: Admittance Peak Points : 64000 Hz and 76000 Hz -> These peaks corresponds to the Fourth Bending and the First Longitudinal Resonance Modes
Admittance Curve

3D Result: Admittance Peak Points : 64800 Hz and 72800 Hz -> These peaks corresponds to the Fourth Bending and the First Longitudinal Resonance Modes

Admittance Curve

Notice the almost the same spectra for the 2D and 3D simulations, except a slight deviation in the resonance frequencies.

View Animation - Vibration Mode at a Particular Frequency

64800 Hz - Resonance
72800 Hz - Resonance