4.6 Virtual Point Transformation

The virtual Point Transformation card, helps you during the preparation phase of a measurement to verify the quality of the test setup.

In the following video, the quality indicators of the Prepare module of DIRAC are explained.

Virtual Point conditioning

The overall number represents the condition number of the VP-Transformation matrix. It expresses the sensitivity of the VP Transformation to errors in the placement and measurement of the forces or responses. It should thus be as low as possible.

If the overall conditioning is red, your setup does not allow to identify all the VP-DoFs.

Good VP setups usually have an overall conditioning below 100.

Visualizing the relative conditioning of each VP-DoF

To visualize the relative VP-DoF conditioning, complete the next steps:

  1. Click the expansion button .
  2. Click the condition number button .

If VP-DoFs are deactivated, the matrix entries are grey.

After doing changes to the setup, press the refresh button to update the results.

Virtual Point contribution matrix

The Virtual Point contribution matrices show how much each sensor channel and excitation contributes to the description of the DoFs of the selected Virtual Point. This is a visualization of the R-Matrix of the VP setup (more theory here).

To visualize the desired contribution matrix, complete the next steps:

  1. Select the correct VP from the drop-down.
  2. Click the Response or Reference button.

Red matrix entries indicate that one sensor channel or excitation dominates the contribution to the VP DoF.

If VP-DoFs are deactivated, these matrix columns are grey.

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