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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 |
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- 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.
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HINT:
Boundary
Condition
Admittance
Curve The First resonance frequency is 26400
Hz in this case.
Unipolar & Bipolar
Sound Sources
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