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Estimation of material functions using system identification techniques
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
2012 (English)In: Control Engineering Practice, ISSN 0967-0661, E-ISSN 1873-6939, Vol. 20, no 10, 972-990 p.Article in journal (Refereed) Published
Abstract [en]

Material properties of an elastic material are characterized by the elastic modulus, which is real-valued and constant. For viscoelastic materials, such as plastics and polymers, the relationship between stress and strain is instead dynamic, and characterized by the complex-valued and frequency-dependent complex modulus. It is in this paper described how system identification techniques can be used to determine the complex modulus using strain data from wave propagation experiments on a test specimen. Modeling, derivation of estimators, and analysis of their numerical and statistical properties are included. Identifiability and experimental design are examined in some detail. Several practical examples are presented using real-world data, and a number of extensions are outlined

Place, publisher, year, edition, pages
2012. Vol. 20, no 10, 972-990 p.
Keyword [en]
material functions, complex modulus, variable projection algorithm, wave propagation, identifiability, experiment design
National Category
Control Engineering Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-184532DOI: 10.1016/j.conengprac.2011.12.009ISI: 000308683800005OAI: oai:DiVA.org:uu-184532DiVA: diva2:566487
Conference
4th Symposium on Advanced Control of Industrial Processes (ADCONIP) / Conference on Temporal and Spatial Quantization in Nonlinear Filtering, May 23-26, 2011, Hangzhou, Peoples R China
Available from: 2012-02-24 Created: 2012-11-08 Last updated: 2017-12-07Bibliographically approved

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Söderström, TorstenRensfelt, Agnes

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