Ensuring Certain Physical Properties in Black Box Models by Applying Fuzzy Techniques
1997 (English)Report (Other academic)
We consider the situation where a nonlinear physical system is identified from input-output data. In case no specific physical structural knowledge about the system is available, parameterized grey box models cannot be used. Identification in black-box-type of model structures is then the only alternative, and general approaches like neural nets, neuro-fuzzy models, etc., have to be applied.However, certain non-structural knowledge about the system is sometimes available. It could be known, e.g., that the step response is monotonic, or that the steady-state gain curve is monotonic. The question is then how to utilize and maintain such knowledge in a black box framework.In this paper we show how to incorporate this type of prios information in an otherwise black box environment, by applying a specific fuzzy model structure, with strict parametric constraints. The usefulness of the apporach is illustrated by experiments on real-world data.
Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 1997. , 8 p.
LiTH-ISY-R, ISSN 1400-3902 ; 1942
Fuzzy modeling and identication, nonlinear systems, monotonicity
Cybernetik och informationsteori
IdentifiersURN: urn:nbn:se:liu:diva-55385ISRN: LITH-ISY-R-1942OAI: oai:DiVA.org:liu-55385DiVA: diva2:315997