Introduction
The goal is to filter out background vibrations that can cause false production detections while the machine is actually stopped. These unwanted vibrations, often residual or related to external elements (such as a fan), can distort the analysis of the machine's state.
Before configuring this feature, please contact support or your usual point of contact, so that you can be guided through the preliminary steps.
This step-by-step guide explains how to configure the noise attenuator from your Keynetic device's configuration interface.
In order to configure the noise attenuator, you will need to be able to turn on your machine without producing ("machine stopped") and to be able to start production ("machine running").
Step 1: Use the device to identify the "noise"
Accessing the Machinoscope
On your device's screen, go to the "Machinoscope" view, where you will see an amplitude-frequency spectrogram:
The X axis represents frequency (in Hertz, Hz) and the Y axis represents the amplitude of the vibration signal. Each visible peak corresponds to a frequency where a vibration is present.
Identifying the noise
- Machine stopped: Turn on the machine, without starting production. Observe the visible peaks. These indicate residual vibrations or ambient noise. These are the bands that will need to be excluded. Note the start and end of the bands to exclude on paper or by taking a photo.
- Machine running: Start a production run, ideally the one where you consider the vibration to be poorly detected. Observe the spectrogram again. Newly visible or noticeably high frequencies are generally related to production.
At this stage, noise filtering may not be the most suitable solution. We recommend taking the time to consider repositioning the device or the remote sensor (housing, frame, interior...), in order to find a measurement point where you can better distinguish production moments from non-production moments, and one that is as far as possible from noise sources unrelated to production (fan, conveyor, etc.). This spectrogram view can be useful for this. If this is not possible, move on to step 2.
Step 2: Configure the noise attenuator via the web interface
Go to your Keynetic device's configuration interface.
- Log in in administrator mode using the credentials provided by support or your usual point of contact
- Then click "Configure" on the "Production detection" widget
- Then go to the "Expert" tab
- Click the "Noise attenuator" calculator
- On the page that appears, you have:
- On the left: Fields to define the frequency bands to filter in the Unwanted frequencies subsection
- On the right: The Datascope view with a frequency/time/amplitude spectrogram
Add each frequency band to filter:
- Enter the start frequency
- Enter the end frequency
Do not modify any other setting, as this could compromise the data capture by your device.
- Save the configuration by clicking the "Confirm" button at the bottom of the page
This takes effect immediately and does not require restarting the device.
Tips and best practices
Intermittent noise
Some background frequency bands can appear occasionally, for example an oil evacuation system that triggers randomly.
If these signals interfere with detection, you can add targeted filtering later on.
Only filter when necessary, so as not to mask useful frequencies.
Best practices
| Step | Action required |
|---|---|
| Initial visualization | Use the Keynetic spectrogram to identify the bands to filter |
| Sensor placement | Area sensitive to production, away from background noise |
| Analysis with machine stopped | Note the frequencies to filter (residual noise) |
| Analysis with machine running | Check the useful frequencies to keep |
| Final configuration | Only enter the bands to exclude, do not modify anything else, then confirm at the bottom of the page |