8.3 Mapping channels

Next, the corresponding Operational Data channels should be mapped to the Master Channels. Within the Operational Data module, select the desired dataset in the Operational Data card and open the Channel Mapping card; the channels of this selected dataset will be displayed in the left table of the Channel Mapping card. To map the channels, simply select the desired channels (using the CTRL and SHIFT keys as needed) in the left table and drag them to the corresponding channels in the right table of Master Channels. If this step is performed correctly, the corresponding rows for the selected channels will turn green in both the left table (selected dataset channels) and right table (Master channels). Numbers will also appear in the “Mapped to” column in the left-hand table containing channels for the selected dataset (see Figure 8‑1).

Alternatively, a simpler method for channel mapping exists for cases where the operational data channels have the same names as the FRF data channels. In this case, we can simply “copy” the channel mapping from the FRF dataset.

To do this, in the Operational Data card, right click on the desired operational run, select “Copy Channel Mapping From”, “FRF Data Channels” and select the correct one, as shown in Figure 8‑2. If the mapping is performed cor­rectly, again the channels will turn green and the “Mapped to” column will be filled in with the correct indices.

Figure 8-2: Mapping channels from another dataset

When analyzing sequences, they will automatically copy the channel mapping from the operational dataset they were generated from. Thus, it is necessary to map the channels of the “parent” operational dataset, and the channels of the sequences will be automatically mapped.

 

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

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