5.1 Master channels

Table of Contents

Before doing any analysis, it is required to define some channel settings in the Channel Mapping card. The Channel Mapping card is accessible from both the Operational Data module and the FRF Data module. Only channels defined as Master Channels in the Channel Mapping card can be used for the analyses in the Analyze module.

You can create Master channels from:

  • Operational dataset channels.
  • FRF dataset channels.
  • Virtual Point channels.

We recommend setting the channels from the FRF data as Masters, for two reasons:

  • If the FRFs come from a DIRAC project, the channel types (e.g. indicator, target) can already be set ahead of time and imported directly into SOURCE;
  • For several analyses, the forces and moments from the FRFs need to be included as Master Channels, so it is convenient to just set all FRF channels (and reference channels) as the Master Channels.

Creating Master channels

When importing a DIRAC project, in the data importer you can decide whether the channels should be automatically set as Masters. You can disregard this option and set master channels manually.

To manually create the master channels, you have to:

  1. Open the Channel Mapping card.
  2. Select the desired channels on the left side.
  3. Drag and drop them to the right side.

If this step is performed correctly, the channels will turn green. Numbers will also appear in the Mapped to column.

Setting channels as master channels

Editing Master Channels

Setting the channel type

It is necessary that each channel is set to the right type to perform the analyses correctly. You can find the different channel types below.

To change the channel type you have to:

  1. Select the channel(s) you want to change.
  2. Right-click and select Set Channel Type.
  3. Select the correct type.

If you imported a DIRAC project in which you have already set the correct channel type, this is already correctly set up for SOURCE.

TypeTechnical NomenclatureDescriptionUsed for:
Response channels$$ \mathbf{u} $$any response channels used in the TPAall analyses
Internal source vibrations$$ \mathbf{{u}_1} $$located on the active side near the actual source of the vibration-
Interface vibrations$$ \mathbf{{u}_2} $$located near the interfacesfree velocity TPA
Active-side interface vibrations$$ \mathbf{{u}_{2a}} $$located near the interfaces, on the active sideinterface force TPA
Passive side interface vibrations$$ \mathbf{{u}_{2b}} $$located near the interfaces, on the passive sideinterface force TPA
Differential interface vibrations$$ \mathbf{{u}_{2a} - {u}_{2b}} $$the difference between active and passive side vibrationsinterface force TPA
Indicator responses$$ \mathbf{{u}_{4}} $$located near the interfaces, used to capture vibration due to all forcesin-situ TPA
Target responses$$ \mathbf{{u}_{3}} $$locations of interest for TPA (e.g. microphone @ driver’s ear)all analyses
On-board validation responses$$ \mathbf{{u}_{3,ov}} $$locations of interest for on-board validationall analyses
Force channels$$ \mathbf{f} $$any force channels used in the TPAall analyses
Internal forces$$ \mathbf{{f}_{1}} $$located on the active side near the actual source of the vibration-
Interface forces$$ \mathbf{{f}_{2}} $$located near the interfacesall analyses
Active-side interface forces$$ \mathbf{{f}_{2a}} $$located near the interfaces, on the active sideall analyses
Passive-side interface forces$$ \mathbf{{f}_{2b}} $$located near the interfaces, on the passive sideall analyses
Target forces$$ \mathbf{{f}_{3}} $$locations of interest for TPA (e.g. microphone @ driver’s ear)reciprocal measurements
Tracking channels-channels that contain information about the operation conditions (e.g. CAN bus, tacho, etc.)all analyses

Editing channels position and direction

If needed, you can edit the position and direction of the channels in SOURCE.

To change position and/or direction you have to:

  1. Open the Channels card.
  2. Click on the toggle to go to Edit mode.
  3. Double click on the field you want to edit and type the correct information.
  4. Press Enter to save.
  5. Exit the Edit mode.


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