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Identification of systems with unknown inputs using indirect input measurements
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Electrical Engineering, Automatic Control. Linköping University, Faculty of Science & Engineering.
2017 (English)In: International Journal of Control, ISSN 0020-7179, E-ISSN 1366-5820, Vol. 90, no 4, 729-745 p.Article in journal (Refereed) Published
Abstract [en]

A common issue with many system identification problems is that the true input to the system is unknown. This paper extends a previously presented indirect modelling framework that deals with identification of systems where the input is partially or fully unknown. In this framework, unknown inputs are eliminated by using additional measurements that directly or indirectly contain information about the unknown inputs. The resulting indirect predictor model is only dependent on known and measured signals and can be used to estimate the desired dynamics or properties. Since the input of the indirect model contains both known inputs and measurements that could all be correlated with the same disturbances as the output, estimation of the indirect model has similar challenges as a closed-loop estimation problem. In fact, due to the generality of the indirect modelling framework, it unifies a number of already existing system identification problems that are contained as special cases. For completeness, the paper is concluded with one method that can be used to estimate the indirect model as well as an experimental verification to show the applicability of the framework.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD , 2017. Vol. 90, no 4, 729-745 p.
Keyword [en]
System identification; model structure; physical models; instrumental variable; closed loop
National Category
Control Engineering
Identifiers
URN: urn:nbn:se:liu:diva-136198DOI: 10.1080/00207179.2016.1222557ISI: 000394644200007OAI: oai:DiVA.org:liu-136198DiVA: diva2:1086594
Note

Funding Agencies|Vinnova Industry Excellence Center LINK-SIC project [2007-02224]

Available from: 2017-04-03 Created: 2017-04-03 Last updated: 2017-05-05

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The full text will be freely available from 2017-11-03 15:46
Available from 2017-11-03 15:46

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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More languages
Output format
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  • asciidoc
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