In some cases, a single dataset contains not only data during the operational excitation of interest, but also some other periods with noise, transition data, etc. If the unnecessary data occurs at the very beginning and/or end of the dataset, the data can simply be “trimmed” to remove the unnecessary data. However, if it is instead desired to extract several regions from a single dataset (e.g. various maneuvers with transition data in between), then segments and sequences must be used. In SOURCE it is possible to extract the data of interest by cropping the desired segments and then merge several segments into a single sequence for the analysis.
Segments can be created using two methods:
By default, the segments will be set to a 1-second duration, or to the value that is set in Preferences. This can either be changed by dragging the end-cursor of the segment to the desired position, or within the Details card when the segment is selected. The Details card allows for higher accuracy, where the specific times for the start, end, and length of the segment are entered manually.
If multiple plots have been generated using a single dataset, the segments will be shown for all plots in the Graphs card, as shown in Figure 6‑4. This allows the user to define the segments using a specific channel (e.g. a tacho or strain gauge channel) and see how the segments will be applied to the other channels (e.g. accelerometers).
After segments have been created, they must be extracted from the operational data and put into sequences to be able to do the TPA analysis. This also allows multiple segments to be put into a single sequence for the analysis, similar to a story line in video editing software.
To create a sequence, first select all desired segments in the Operational Data card by holding CTRL while selecting them. Then, right click on the selection and select “Create sequence”, or press key command CTRL-Q. A sequence will appear in the Operational Data card.
The sequence can be loaded, plotted, analyzed, etc. in the same way a full dataset is operated on. If any of the segments change in start time or length, the sequence will be updated accordingly. For changes to be reflected in a plot of the sequence, it suffices to scroll the channel in the title selector once to recalculate the data.
Figure 6-4: Extracting segments from operational data
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