On the use of flexural wave propagation experiments for identification of complex modulus
2003 (English)In: IEEE Transactions on Control Systems Technology, ISSN 1063-6536, E-ISSN 1558-0865, Vol. 11, no 6, 863-874 p.Article in journal (Refereed) Published
In this paper, we investigate the nonparametric estimation of the frequency dependent complex modulus of a viscoelastic material. The strains due to flexural wave propagation in a bar specimen are registered at different cross sections. The time domain data is transformed into frequency domain using discrete Fourier transform and a nonlinear least squares algorithm is then employed to estimate the complex modulus at each frequency. Inherent numerical problems due to associated ill-conditioned matrices are treated with special care. An analysis of the quality of the nonlinear least squares estimate is also carried out. The validity of the theoretical results are confirmed by numerical studies and experimental tests
Place, publisher, year, edition, pages
IEEE , 2003. Vol. 11, no 6, 863-874 p.
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject Electrical Engineering
IdentifiersURN: urn:nbn:se:kau:diva-22107DOI: 10.1109/TCST.2003.819589OAI: oai:DiVA.org:kau-22107DiVA: diva2:595783