Selecting the individual FRF measurements to maximize the overall coherence can be a very time-consuming task. To help you and speed up this step, we have developed Automatic Measurement Selection (AMS). AMS feature selects for you the most coherent FRFs, according to the settings you define.
You can find AMS in the Measure module. You can only use AMS when you are doing a measurement campaign.
AMS will automatically select the best measurements, checking a metric that we call “measurement similarity”. The similarity considers the coherence of all sensor channels of one excitation location, and picks the best impacts, according to your settings.
Simply speaking, AMS finds and selects the impacts that make a column of the coherence matrix in Analyze “as green as possible”. When you apply AMS to all excitations, it will optimize the entire coherence matrix at once. In the pictures below you can see how the coherence of the entire measurement improves when using AMS.
You can create as many AMS presets as you desire and run them separately, to check the results when using different settings.
To create a new AMS preset, click . The new AMS preset will appear at the top of the Impact location card.
You can create multiple AMS presets with different settings.
By default, AMS will always select the two best-matching measurements, no matter which settings are defined. However, you can edit each setting of your AMS preset.
When you run it, AMS will always select the two best measurements, even if they do not meet the defined settings.
When creating a preset, you can edit the following settings:
You can create multiple presets according to your needs. For example, you can create a preset for each hammer you are using in the project, each of them checking similarity in a specific frequency range.
AMS considers the filters of the hammer merge that have been set in DAQ.
You can run AMS per single excitation or for the entire measurement.
To run it for a single excitation point, you have to:
To apply AMS to all excitations in the project, you have to:
If you Star a measurement, every other measurement will be compared to the starred one.
You can also use AMS in Live mode, while you are measuring. After every impact, DIRAC will check its similarity with the others and will select the most similar ones automatically. If you are testing by yourself, you can be notified with sound feedback whether the impact meets the similarity requirement or not.
To activate the AMS live mode, double-click on the AMS preset, and it will turn orange.
Double pulses and other faulty measurements are automatically excluded from the results.
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