Non-parametric identification of viscoelastic materials from wave propagation experiments
2001 (English)In: Automatica, ISSN 0005-1098, Vol. 37, no 4, 511-521 p.Article in journal (Refereed) Published
We investigate how the frequency-dependent wave propagation coefficient and complex modulus for a linearly viscoelastic material can be estimated from wave propagation experiments. The strains at different sections of a bar specimen are measured as functions of time. The time series are transformed into the frequency domain, where a non-parametric identification is made. A thorough analysis of the quality of the non-parametric estimate is made, in which approximate expressions for the covariance matrices of the wave propagation coefficient and the complex modulus are derived. The validity of these expressions are confirmed by numerical studies and real experiments.
Place, publisher, year, edition, pages
2001. Vol. 37, no 4, 511-521 p.
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject Electrical Engineering
IdentifiersURN: urn:nbn:se:kau:diva-21826DOI: 10.1016/S0005-1098(00)00188-6OAI: oai:DiVA.org:kau-21826DiVA: diva2:595502