II. How To Use ATILA

6.2 Underwater Cymbal (Homework 9)
Unipolar & Bipolar Sound Sources


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

  • Learn the underwater sound propagation- Monopole & Dipole
1.
Using the same Cymbal geometry (including the polarization configuration of the two PZT 4 disks), just applying the voltage 1 V and -1 V to the two PZT disks (180 degree phase difference), obtain the Dipole sound source.
2.

Using the following principle, simulate the situation where the sound pressure is completely cancelled. Try to use the following numbers for the simualtion: R = 2, Vb = 0.34 V and Vf = 1 V, and obtain the cardioid type contour.

HINT:

Boundary Condition

Admittance Curve
The First resonance frequency is 26400 Hz in this case.

Unipolar & Bipolar Sound Sources

Unipole
Dipole