Tonpilz devices are able to achieve a combination of low frequency and high sensitivity in a compact footprint which makes them ideal as projectors for sonar applications. OnScale can accept models from CAD as well as generating models from simple wizards which makes modelling a single or a multi stack array very straight-forward. With our ability to run multi-million element models in quick timescales, a variety of design can also be explored.

1. Tonpilz Transducer Simulation
CONFIDENTIAL

2. 4mm defect
15 mm plate
Tonpilz devices are able to achieve a combination of
low frequency and high sensitivity in a compact
package
OnScale is capable of simulating a wide range of
tonpilz devices, from simple stacks to complex multi
stack arrays
This presentation covers a range of capabilities:
– Simple wizard models
– CAD based model of a tonpilz stack
– 5x5 Array model using the same CAD design

3. 4mm defect
15 mm plate Experimental measurements can
be easily duplicated in simulation
Electrical Impedance and
conductance
Mode Shapes
Pressure and displacement levels
Beam patterns
TVR
OCV
New materials such as single crystal
and lead free PZT
Crosstalk
Rear breakthrough
Temperature rises

4. Wizards are simple graphical tools that allow models of common
devices to be constructed very quickly
There are a number of wizard models relevant to tonpilz design:
As well as producing a range of standard outputs, wizards generate
OnScale model files which can be modified by the user to customise
the design

5. Wizard interface Resulting geometry

6. Wizards allow many common outputs to be generated:
– Impedance / admittance
– Displacement / pressure output
– Virtual vibrometer
– TVR / OCV
– Virtual hydrophone
– Mode shapes
– Directivity

7. OnScale ModelSolidWorks model
CAD geometry can easily be imported into OnScale
using our CAD Import Tools

8. Main electrical
resonance at 17.3 kHz
Additional
resonances at
37.0 kHz and
43.6 kHz
In air impedance gives a clear indication of device
behaviour at different frequencies

9. Main thickness
mode at
17.3kHz
Head
mode at
43.6kHz
Modes shapes help establish the nature of each mode

10. 5x5 array in water
element impedance
The CAD model of the tonpilz stack can easily be patterned into an
array
Array geometry can be controlled parametrically, allowing different
array designs investigated rapidly

11. TVR (left) and
17.3kHz beam
pattern (below)
TVR
Frequency (Hz)
Kirchhoff extrapolation can be used to generate far field outputs

12. Cross-talk can propagate through the array structure, and can be
observed in the mode shape videos. It can also be measured on
adjacent electrodes

13. Wizard 2D 3D Stack 3D Array
OnScale is ideally suited to analysing tonpilz designs, and is
capable of handling everything from simple 2D models to large
3D array designs
Time domain outputs directly replicate experiment allowing
direct comparison
The analysis tools integrated into Flexlab make it easy to
analyse designs and understand how they are performing
Rapid execution of models makes it possible to perform large
design sweeps and design optimisation studies

14. Simulation Metrics
Model Wizard 2D 3D Stack 3D Array
Elements 4,290 212,000 2,500,000
Runtime* 6 s 2 mins 45 s 1 hr
Memory
(RAM)
5 MB 60 MB 1.5 GB
* Run on dual quad core Intel Xeon E5520