Adding Loads

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Now let's add two loads to our model, which will represent electrodes at the top and bottom of the PZT disk.

Adding the Loads

First off, let's add the two loads. We'll set their properties afterwards.

  1. In the Model Tree, expand Boundary Conditions and then click beside Loads. The Load Definition window shows.
  2. For Creation Mode, select Geometry Interface. This allows us to create our loads between the water and the PZT.

    load-definition.png

  3. In your model, click the PZT to select it for Geometry.

    Note: Alternatively, use the Geometry dropdown select primitive_2 (pmt3).

  4. In your model, click the water to select it for Interfacing Item.

    Note: Alternatively, use the Interfacing Item dropdown to select primitive_1 (watr).

  5. Click Create Load. This creates our first load.
  6. Repeat steps 3–5 to create the second load.

Limiting the Application of the Loads

By default the load is applied on all sides of the PZT. We need to change this to limit the application of our first load to the top of the PZT and the application of the second load to the bottom of the PZT.

  1. In the Model Tree, click load_1.
  2. In the Properties window, change Interface Definition > Minimum > Y to 6.0. The load changes to a line along the top of the PZT

    limiting-application-of-load.gif

  3. In the Model Tree, click load_2.
  4. In the Properties window, change Interface Definition > Maximum > Y to 4.0. The load changes to a line along the bottom of the PZT.

Setting the Other Properties of the Loads

We now need to set the properties of the loads to make them electrodes.

load_1

  1. In the Model Tree, click load_1.
  2. In the Properties window, for Load Type, select Voltage.
  3. For Area Scaling, type 2.

    Note: We're using area scaling to take into account the fact that the disk geometry in 2D is just a half model. We're applying an area scaling of 2 to consider the "half surface" loading.

  4. For Termination, select timefunc_1.
  5. For Amplitude Scale Factor, type 1.

load_2

  1. In the Model Tree, click load_2.
  2. In the Properties window, for Load Type, select Voltage.
  3. For Area Scaling, type 2.
  4. For Termination, select Ground.

What Next?

We're almost there! Next we need to set the domain boundaries.

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