FRF Geometry visual control is used to visualize transfer function calculation. It can be found on custom control drop down menu in design mode. If the icon does not appear, the visual control FRFGeometry.vc must be added to Addons folder of Dewesoft.
- Left click: rotate structure
- Right click: translate structure
- Left+Right click: zoom
- Mouse wheel: zoom
There are several options which can be set for the geometry:
- Load UNV - Loads structure data from external UNV (universal file format) file
- Editor - Opens FRF Geometry editor
Here you can select mouse left button behavior. It can be set to rotate, translate or scale the object.
Button Reset view will return back to default position.
Scale and Speed values define how much fast and how much nodes should move. Default value for both fields is 1.
Icons in the View section are used to enable/disable view options.
- From cursor channel - animated frequency is taken from yellow cursor on 2D graph
- Manual - manually define animated frequency
FRF Geometry Editor
Explanation of terms
For easier understanding, main terms are explained here.
- Node - Node is point where sensor is positioned on object. Node is defined with location (X, Y, Z) and rotation around axes (X angle, Y angle, Z angle).
- Trace line - Trace line connects two nodes together. Triangle - Surface defined with 3 nodes
- Quad - Surface defined with 4 nodes.
- Cartesian coordinate system - Usually nodes are presented with Cartesian coordinate system. This means you have X, Y, Z position and rotation around all three axes. Coordinate system can be used for grouping nodes, because you can later rotate or translate them with Center point.
- Cylindrical coordinate system - Cylindrical coordinate system is used for easier creation of round objects. Points are defined with radius, angle and z (height) around coordinate systems center point.
- Creation of structure - If structure data is already loaded and we want to make a new one, we click on File -> Clear structure.
Creation of structure always begins with nodes, so we have to switch to Nodes tab. Now we have to create coordinate system in which we will define our nodes. This can either be Cartesian or cylindrical.
After coordinate system is created, we can add nodes with Plus button.
In the picture below, you can see Cartesian coordinate system with 12 nodes.
After nodes are created we can change their rotation (according to how sensor is rotated on object) with all three axes. Node can be selected with selection in node table or with right mouse click on structure preview window. When node is selected rotation is shown with small coordinate system located directly on node. In the picture below you can see selected and rotated node.
When node is selected, we can remove it by pressing the Minus button on nodes tab.
When basic nodes are defined we can go ahead and add trace lines. Easiest way to create trace lines is with Line strip button. After Line strip button is enabled, we can add trace lines automatically with right clicking on nodes in preview window. With each click, new trace line will be created connecting new node with previous one. When line strip is finished, click on Line strip button again to disable it – with that we come back to normal behavior.
If we don’t want to draw connected line strip, we can also manually add trace line by pressing on the Plus button in Trace lines tab.
With that new trace line is added and we have to select nodes which connect them – we can do that either with selecting nodes in the left table or by right clicking in preview window.
In the picture below we can see object with some trace lines added.
Currently selected trace line is marked with red color in the preview window. This helps selecting nodes trough table since we always see what is selected in 3d preview window.
To improve object preview we can also add surfaces (triangles and quads). Both are added in the same way.
For example, to add a quad, we select Quads tab, press on the Plus button and then select 4 nodes with selecting them in the left table.
Below you can see the same object as in previous screenshots with added surfaces.
After structure is defined we can store it in external UNV file by clicking on File -> Save UNV…«. If structure is stored in external file, we can later use it another project by selecting File -> Open UNV…. If we need structure just for one setup, we can also just click on Save and exit button in the lower right corner. With that, structure is stored within Dewesoft setup and data file.
If you want to have structure stored just in setup, don’t forget to press Save setup later in Dewesoft channel setup screen.