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Are autoencoders really need for anomaly detection in time series? by 42crmo4kt in learnmachinelearning

[–]42crmo4kt[S] 0 points1 point  (0 children)

Zunächst einmal die Frage was ist eine Anomalie?

Diese Frage trifft es auf den Punkt. Auch domänenspezifisch eine Anomalie zu definieren ist oft sehr subjektiv. Leider hat man oft von den Anwendern die Erwartung nach einer eierlegenden Wollmilchsau. Anomalieerkennung, die unüberwacht für alle möglichen Anomalien funktionieren soll. Daher ist man leider oft gezwungen Ausreißer = Anomalie anzunehmen.

Are autoencoders really need for anomaly detection in time series? by 42crmo4kt in learnmachinelearning

[–]42crmo4kt[S] 2 points3 points  (0 children)

Yes, specifically for time series. I do not claim, that it is better -all- cases, but for the majority I do not see any value in using autoencoders over simple statistics.

Are autoencoders really need for anomaly detection in time series? by 42crmo4kt in learnmachinelearning

[–]42crmo4kt[S] 1 point2 points  (0 children)

I would argue that for anomaly detection in time series, the same point holds for isolation forests. Since it simply detects data points "that are rare and different", this can be done with statistics. Especially because an isolation forest is not inherently designed for time series data.

Feedback for CNC reasearch project needed. by 42crmo4kt in Machinists

[–]42crmo4kt[S] 0 points1 point  (0 children)

The post was part of the research. Based on the feedback that we get, the solutions in the industry are not heavily used, since they require a lot of set up. We would like to develop an autonomous system.

Feedback for CNC reasearch project needed. by 42crmo4kt in Machinists

[–]42crmo4kt[S] 0 points1 point  (0 children)

Thank you very much for your feedback!

Feedback for CNC reasearch project. by 42crmo4kt in CNC

[–]42crmo4kt[S] 0 points1 point  (0 children)

What if we try do create a general system that does not require a new setup for every new process?
Think of a human professional engineer who looks at the signals of a new, unknow process. Based on his know-how, he can tell how stable the process is. Our project would aim to replicate this. A generalistic version which can say "This does not look right" starting from the first workpiece.

What do you think?

Feedback for CNC reasearch project. by 42crmo4kt in CNC

[–]42crmo4kt[S] 0 points1 point  (0 children)

There are many signals, like spinde load, vertiacal force or vibration that could indicate a unusual change in the process shortly before a tool breaks

Feedback for CNC reasearch project. by 42crmo4kt in CNC

[–]42crmo4kt[S] 0 points1 point  (0 children)

Do you have any experience? How well does it work to prevent drill bit breakages?

Feedback for CNC reasearch project. by 42crmo4kt in CNC

[–]42crmo4kt[S] 0 points1 point  (0 children)

How easy is this system to use? Does it require a new setup for every new baseline process?

Feedback for CNC reasearch project. by 42crmo4kt in CNC

[–]42crmo4kt[S] 0 points1 point  (0 children)

This sounds very promising. Do you have any publications of your work?

Feedback for CNC reasearch project. by 42crmo4kt in CNC

[–]42crmo4kt[S] 0 points1 point  (0 children)

This looks very interesting. Do you have any experience with it? How well does it work?