## 14.3. Example 3

In this example, the Monostatic RCS of two cubes is calculated, where one cube is dynamic.

Step 1

Create a new project followingSTEPS 1 to 5 in Example1 above.

Step 2

Click on Geometry→ Solid →Box.

Create box command

Create the first box by entering the following parameters from the command line as shown in the next Figure.

·         First corner of base [x y z]:   0.5   -0.5   0

·         Base size [width depth]:   1 1

·         Height:  1

Box Parameters box

Step 3

Now, let’s add the dynamic cube to the model. We want this cube to move in the direction of the positive Z-axis at 0.5 meters each step in the simulation. We will use three steps for this simulation.

First, we must define a parameter for the geometry that represents the Z coordinate of the base of the cube at each step of the simulation. To do this, select Geometry → Parameters → Define Parameters and the following window appears:

Define parameters

Define parameters panel

Press the Add parameter button, after which a row appears in the table. In the Parameter column, change the name of the created parameter to “height”, for example. Then change the values to “{0.0, 0.5, 1.0}” and left-click the Save button to save the changes.

Now, create a new box as the other.It is possible to change the parameters as desired, but the z coordinate of the first corner of base must be now the parameter “altitude”.

Creating the dynamic cube

Optional: To see a visualization of each step for the second cube, select the Geometry → Parameters → Set Step. Enable “Linear (By step)”, set the desired time delay between steps, and left-click Run to see the animation on the Geometry View.

Execute Parameters box

It is possible to see the two remaining steps for the simulation in the next Figures.

View of de dynamic cube (Step 2)

View of de dynamic cube (Step 3)

Step 4

Click on Simulation → Parameters. Enter the simulation parameters as shown in the next Figure.

Simulation parameters

Step 5

Select RCS → Parameters and enter the parameters shown in the next Figure.

RCS parameters

Step 6

Select Output → Observation Directions and enter the parameters shown in the next Figure.

Observation Directions option

Step 7

Select Meshing → Create Mesh. Select the appropriate number of processors available to run the meshing process as shown in the next Figure and left-click Mesh.

Meshing configuration

Resulting Mesh

Step 8

Select Calculate → Execute and enter the number of available processors for this simulation.

Calculate options

Step 9

Click on Show Results → Far Field → View Cuts, to show the RCS graph.

RCS graphic of the first step

The plot corresponds to the RCS of the first step (when the two boxes share the same Z coordinate). To plot the graphics for the remaining two steps, select “2” in the Step combo-box and left-click the Add Series button. Repeat this procedure to add Step 3 to the RCS graphic.

RCS graphic showing each step

Step 10

Click on Show Results → Far Field → View Text Files, to show the RCS data file. Select the step to obtain as a data file. Press OK to continue.

View Text Files options

Far Field text file

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