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Automated active fa...
Automated active fault detection in fouled dissolved oxygen sensors
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- Samuelsson, Oscar (författare)
- Uppsala universitet,Avdelningen för systemteknik,IVL Swedish Environm Res Inst, Stockholm, Sweden
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- Zambrano, Jesus (författare)
- MathWorks AB, Knarrarnasgatan 7, SE-16440 Kista, Sweden
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- Björk, Anders (författare)
- IVL Swedish Environm Res Inst, Stockholm, Sweden
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- Carlsson, Bengt (författare)
- Uppsala universitet,Reglerteknik,Avdelningen för systemteknik
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(creator_code:org_t)
- PERGAMON-ELSEVIER SCIENCE LTD, 2019
- 2019
- Engelska.
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Ingår i: Water Research. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0043-1354 .- 1879-2448. ; 166
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Biofilm formation causes bias in dissolved oxygen (DO) sensors, which hamper their usage for automatic control and thereby balancing energy- and treatment efficiency. We analysed if a dataset that was generated with deliberate perturbations, can automatically be interpreted to detect bias caused by biofilm formation. We used a challenging set-up with realistic conditions that are required for a full-scale application. This included automated training (adapting to changing normal conditions) and automated tuning (setting an alarm threshold) to assure that the fault detection (FD)-methods are accessible to the operators. The results showed that automatic usage of FD-methods is difficult, especially in terms of automatic tuning of alarm thresholds when small training datasets only represent the normal conditions, i.e. clean sensors. Despite the challenging set-up, two FD-methods successfully improved the detection limit to 0.5 mg DO/L bias caused by biofilm formation. We showed that the studied dataset could be interpreted equally well by simpler FD-methods, as by advanced machine learning algorithms. This in turn indicates that the information contained in the actively generated data was more vital than its interpretation by advanced algorithms.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)
Nyckelord
- Active fault detection
- Monitoring
- Receiver operating characteristics
- Gaussian process regression
- One-class classification
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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