This article explains how to configure stop detection using the algorithm known as "next-generation". This approach relies on labeling vibration recordings that are representative of production or a stop (non-production). The algorithm's parameters are then calculated completely automatically using this labeled vibration data, unlike the historical "legacy" approach, where they need to be adjusted manually. This is referred to as auto-calibration through human labeling.

In addition to being simpler to set up, this approach is particularly robust when facing complex vibration scenarios not handled by the legacy approach: 

• Presence of continuous, disruptive noise (fans, smoke extractors, etc.), even during non-production
• Certain specific phases, such as warm-up, must be treated as a stop, even if their amplitude may be high
• The machine's vibration behavior varies significantly depending on the part reference

Before you start

Log in to your device's configuration interface. 

Step 1 - Choosing the algorithm

To do this

1. On the "Production detection" widget, click "Configure"

1. A page then opens
2. In the "Detection algorithm choice" section, click "Next-generation"

3. Then click the "Calibrate" button

Step 2 - Labeling vibration segments

This is the step where vibration is recorded and where you will be able to label it as corresponding to a stop or to production.

Some important information before starting the recordings

• It is strongly recommended to record several short segments of production and stops, ranging from a few dozen seconds to a few minutes each, rather than a few long segments
• It is not mandatory to record an entire production cycle
• The total duration of vibration recordings must not exceed 1h30, beyond which it becomes impossible to start new ones, and you will then need to delete some to free up space
• It is strongly recommended to clearly note what each vibration segment corresponds to: normal production, finishing, warm-up, normal stop, maintenance, etc.
• Make sure to record relevant vibration segments that are representative of the production and stop phases, taking care to avoid overlapping areas between these phases
• At least one production segment recording and one stop segment recording are required to be able to run an auto-calibration
• Adding or deleting a vibration recording will only be taken into account by the detection algorithm after (re)running an auto-calibration

Starting the recordings

• Make sure the machine is actually in production and click the corresponding button

• Confirm that production is actually taking place
• The recording then starts, you can stop it at any time by clicking the "Confirm" or "Cancel" button

• Once the recording is confirmed, you will be able to enter, if you wish, some additional information to clearly note what this production vibration segment corresponds to

• Do the same for other production and stop segments
• Once you have recorded enough relevant vibration segments, you can click "Run auto-calibration"
• A small window will appear telling you to wait until processing is complete, this can take up to a few minutes.

• Once processing is complete, you will be shown status information with the confidence level regarding the ability to correctly discriminate between production and stop, and the delay (in seconds) the algorithm will take to provide this information

• The stop detection algorithm is now configured and operational

Going further

Viewing one or more vibration segments

You can view a vibration segment by clicking the icon highlighted in the image below.

You can also view all recorded vibration segments, with a color specific to each label, production or stop. To do this, click the "global view" button to get the following result: 

Editing metadata associated with a vibration recording

You can correct or add metadata to a recording that has already been made. To do this, click the "pencil" icon to the right of the row corresponding to the recorded segment. A small window will then appear, letting you edit what you want: 

Deleting a recording

By clicking the "trash" icon to the right of the row corresponding to the recorded segment, you can delete a recording. After confirmation, it will be permanently lost. Running an auto-calibration is required for the detection algorithm to stop taking this vibration segment into account.

Iteratively refining the calibration

An initial auto-calibration provides a first level of detection. To improve it over the long term, it is recommended to take an iterative approach over several days, or even several weeks, regularly comparing the detector's results against real conditions on the ground.

Why refine over time?

A machine's vibration behavior can vary depending on the production phases, reference changes, warm-up, maintenance, or certain specific stops. An initial configuration may therefore be relevant without yet covering all the cases observed in the field.

Recommended method

After the detector's first auto-calibration:

1. Let the detection run for a representative period
2. Compare the detected stops against real conditions on the ground
3. Identify any discrepancies
4. Enrich the labeling with new vibration segments representative of the poorly covered cases
5. Run another auto-calibration to take these new recordings into account
6. Repeat this process until you achieve satisfactory detection

If this is not enough, it will be necessary to change the location of the vibration sensor.