1.4 System requirements & release notes

Recommended computer specifications

  • 64-bit Windows version 7 or later
  • 16 GB RAM
  • Dedicated GPU
  • Full-HD (1920*1080) resolution or more

DAQ compatibility

  • PAK MKII G2 frontend (generation 2 required)
  • PAK live firmware

Release notes

DIRAC version 3.2.2

4 February 2022


  • Changes have been made to the way the impact and response spectrum is shown in Measure. The doubling of frequency lines above 0 Hz is now omitted. This way, the 0 Hz value is better in-line with the spectral amplitudes of the other frequency lines. This has no impact on any FRF data, just on how the frequency spectra are shown in Measure.


  • Upgrades to the License Manager. This now keeps the settings centrally in the folder %localappdata%\VIBES.technology\Licensing, and shares these with other VIBES software. Upon the first start, you may need to reload the license server settings once.


DIRAC version 3.2.1

20 December 2021

This version of DIRAC brings the following 3 main features. A video showing all the new functionalities can be found here.

Matrix post-processing options in Analyze
Matrix post-processing options have been added to the Analyze module. These options serve to perform additional calculations on the selected subset of the FRF matrix, specified as matrix presets. The options apply to so-called Custom Matrix Presets, as can be defined using the controls in the top-left corner. Options are available for:

  • Converting the measured accelerance to another representation, such as receptance or dynamic stiffness. As a result, time-integration and matrix inversion is applied depending on the chosen representation. Note that only kinematic quantities such as Acceleration (m/s^2) and Rotational Acceleration (rad/s^2) are time-integrated; other quantities such as Sound Pressure (Pa) are unaffected.
  • Transposing the matrix to obtain the reciprocal representation. This can be useful to get a reciprocal matrix, where the excitation positions become response positions and vise versa. The resulting quantities and units can be observed in the information panel.
  • Element-wise inversion, as an alternative to the default option which uses full matrix inversion.

The panel to the right shows the effective post-processing steps to clarify what is processed, and which quantities are resulted as channels (rows) and reference channels (columns). The processing steps are applied to the FRF subset specified by the channel and reference channel selection for this particular matrix preset.

The post-processing options serve various purposes. A typical use case with direct engineering value is the calculation of Dynamic Stiffness of the Virtual Point transformed FRF Matrix. This can for instance be used for (rubber) mount characterization: the cross-diagonal reveals the dynamic stiffness in all 6 translational and rotational directions. It is further recommended to activate the Reciprocity matrix quality type in this case to assess the quality of the results.

As this type of post-processing is a common choice, a direct preset VP Dynamic Stiffness has been made available under the matrix preset dropdown menu. This preset will always apply to the Virtual Point FRF Matrix.


Undo and redo functionality in Prepare
Actions in the Prepare module can now be reversed and/or redone. When working on a design of experiment, actions such as positioning the sensors, aligning the Virtual Points or setting the impacts can be undone and redone in a user-friendly manner. Undo and redo actions are available in the renewed title bar as two buttons; the on-hover tooltip reveals the action that can be undone/redone. One may also use the key commands CTRL-Z and CTRL-Y.

The Undo/redo features include the following:

  • Moving/rotating any object in the 3D viewer
  • Changing properties in the Property widget
  • Changing properties in List Mode
  • Adding objects
  • Removing objects
  • Editing multiple objects at once


Improved UFF export
The option to export FRF matrices in UFF format has been extended. This feature works in a similar manner to the other exporters in DIRAC. Any sensor names that are longer than 10 characters will have their names shortened using the following logic:

  • For excitations, the word “Excitation” will be replaced with “Exc”. For example, “Excitation 11” to “Exc 11”
  • Channel names (Response Entity Name or Reference Entity Name) which are longer than 10 characters will be converted to Pascal Case where the spaces are removed and only the first letter of each word is capitalized. For example, “VP1 Force X” will be converted to “Vp1ForceX”
  • Channel names that are still too long in Pascal Case, will be shortened to 10 characters and the Channel-ID will be added to the end to guarantee uniqueness. e.g. “EPS CP1 Right” will be converted to “EpsCp1Ri#7”


Other changes
Multiple objects can be moved as a group. If the selection contains impacts or mountable sensors, only XYZ translations are allowed.

  • When attempting to delete sensors or impacts that are used in the campaign, a warning is issued. When continuing, the channel mappings and/or measurement data are removed and cannot be restored using undo.
  • The main user interface has been revamped with a DIRAC-specific blue color. The new title bar provides quick action buttons for opening and saving the project, as well as the undo and redo actions in Prepare.
  • The default color for excitations (impacts) has been changed to blue.
  • Several smaller bug fixes for working in the Prepare module.


DIRAC version 3.1.6

17 October 2021


  • The speed of calculation and use of memory has been improved.
  • An issue was addressed where units were not correctly shown for rotational FRFs.


DIRAC version 3.1.5

01 October 2021

Support for CHS42x module for the MK2
Support was added for the CHS42x module on an MK2. This new module can measure in both ICP and charge mode. One can change the mode by setting the channel mode in the DAQ wizard and pushing these settings to the DAQ.

Bulk-replacing data in an Import Campaign
When working with a so-called Import Campaign to import FRF data from ATFX, MAT, or DIRAC format, it is now possible to bulk-replace datasets and leave the channel mapping intact.

Upgrades to the VIBES License Manager
Several issues have been addressed to improve the useability and stability.

  • The connection to a Cloud Licensing Server (CLS) will now work properly on the first start when working behind a proxy server.
  • An issue was resolved where borrowed licenses may disappear for a certain amount of days.
  • When using different CLS servers for various products, the License Manager now correctly shows the one you are currently connected to. It also prohibits returning licenses to the wrong CLS server.
  • More user feedback has been added to inform on any connection errors.
  • A yellow or red color now highlights soon-to-expire licenses.

DIRAC manual to online VIBES Academy page
The manual is now replaced by a link to the new online VIBES Academy page.


DIRAC version

28 July 2021

Version 3.1 adds new features in the so-called imported campaign, i.e. campaigns that use pre-measured FRF data.

Important note before installing
Before installing version 3.1, make sure to push back any server or network licenses that you have currently borrowed. This version includes an update on the VIBES License Manager; this now uses the lower-case Window login name in the user identification key. This user identification key is now shown on the top-right of the VIBES License Manager.

Project version upgrade
Projects saved in DIRAC 3.1 can not be opened in older versions. Please advise other users to upgrade to this version if you are sharing DIRAC project files.

Import campaign
The Data wizard in the import campaign has been improved to provide a quicker experience in mapping sensors/excitations with imported channels and reference channels.

  • The tables on the right side can be sorted and filtered on all present columns. When dragging multiple channels from the left side, this sorting is respected. This might help in certain scenarios where sorting of channels hinders quick matching and information in, for instance, the description displays a more accurate representation of the ordering on your DAQ.
  • Right-clicking on the tables on the left, you have an option to auto-map the channels. This will look for unique name matches between the selected channels on the left (DIRAC) side and the unmapped channels on the right (data) side. If needed, one could already specify the desired channel names in PrepareList Mode to ensure name matches.
  • As odd as may sound, you can now also import from DIRAC project files. If you drop in a DIRAC project, you will get access to the predefined matrix presets, e.g. Measured, VP and All. This can be useful for roving sensor setups, where one DIRAC measurement project contains half of the channels and another project the second half.

Other changes:

  • The excitation source channels, i.e. the channels used for your impact hammer(s), are now also shown in the sensor channel list in PrepareList Mode.
  • Several fixes in UI inconsistencies.


DIRAC version

25 May 2021


  • To prevent a potential overflow issue on some MK2 systems, DIRAC does not push the serial numbers of the sensors anymore.
  • An issue was fixed where one could not map sensors after a re-connection of the MK2.


DIRAC version

21 May 2021


  • Support for importing FRF and coherence data from MAT-files that are exported from HEAD acoustics. The MAT-files should contain the customary “shdf” structure.
  • Released restriction in import campaigns to have a matching number of channels and reference channels throughout different imported files. This now allows having FRF matrices that are partially zero, in the case that not all channels and reference channels match.


  • Matrix presets in Analyze can now be edited again by right-clicking on them and choosing one of the options to edit, delete or duplicate.

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