II. How To Use ATILA

1.1 Rectangular Plate (Homework 1)
Second-Order Harmonic Vibration Mode


PROBLEM - 3D Rectangular Plat, k31 Mode, PZT4 = 40mm x 6mm x 1mm


  • Notice that the second resonance frequency is three times of the first resonance frequency.
1.
Loading the frequency range around 120 kHz, calculate the admittance spectrum for the 2nd Higher Order Harmonic vibration.
2.
Loading the maximum frequency, obtain the 2nd Order Harmonic vibration mode.
3.
Compare the maximum strain and stress levels (under 1 V applied) among the 1st and 2nd modes.
You are requested to use a different mesh, and more calculation frequency points (21 points minimum).
The admittance spectrum, vibration mode animation and the maximum strain/stress table (comaparing the 1st and 2nd modes) should be submitted in a Power Point Presentation file.

HINT:
View Results – Higher Order Harmonic
Loading frequency: 122000 Hz -> Harmonic Case -> OK
Set Deformation -> Displacement
Set Results -> View -> View results -> Contour Fill -> Stress - > XX-stress

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