Side-Lobe Suppression by Electrode Shading


Mechanical Model Execution

Model Description

This example shows a way of implementing shading on a single aperture sonar transducer which is used to suppress side-lobe levels.

Shading can be used in the design of a transducer element for different applications e.g. sonar applications. Side-lobe suppression enhances image quality and shadowing effects while minimizing the ghost images in sonar applications.

Shading can be implemented mechanically via hamming shaped electrodes (seen below) or electrically via varying voltage amplitudes. This model uses a hamming shaped electrode to produce mechanical shading.


Parametric Variables

This model allows the following variables to be modified, the thickness of the load isn't used but can be added by the user by removing a void material and adding the material water

Parametric Variable


Default Value


Thickness of the composite 

4 mm


Thickness of the load 

10 mm


  • Time Histories (XY Graphs)
    • Drive input signal
    • Voltage and charge on electrodes
    • Y Displacement on top of composite
  • Field Data
    • Maximum Y Displacement in Model
  • Mode Shapes (Harmonic Analysis) of base design
    • 0.5 MHz
    • 1.5 MHz
    • 2. MHz
    • 2.5 MHz


Runtime Statistics

Model size

171000 elements

Solve Time

 4 minutes 23s (2 CPU)

Core Hours


Memory Usage

711 MB

Recommended CPU Configuration



The following input files are required to run this model, click here to download the input files:

Download: Shading Files