Inverse estimation of the elastic and anelastic properties of the porous frame of anisotropic open-cell foams
2012 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 132, no 2, 621-629 p.Article in journal (Refereed) Published
This paper presents a method for simultaneously identifying both the elastic and anelastic properties of the porous frame of anisotropic open-cell foams. The approach is based on an inverse estimation procedure of the complex stiffness matrix of the frame by performing a model fit of a set of transfer functions of a sample of material subjected to compression excitation in vacuo. The material elastic properties are assumed to have orthotropic symmetry and the anelastic properties are described using a fractional-derivative model within the framework of an augmented Hooke's law. The inverse estimation problem is formulated as a numerical optimization procedure and solved using the globally convergent method of moving asymptotes. To show the feasibility of the approach a numerically generated target material is used here as a benchmark. It is shown that the method provides the full frequency-dependent orthotropic complex stiffness matrix within a reasonable degree of accuracy.
Place, publisher, year, edition, pages
2012. Vol. 132, no 2, 621-629 p.
Anisotropy, Estimation, Numerical methods, Stiffness matrix
IdentifiersURN: urn:nbn:se:kth:diva-103779DOI: 10.1121/1.4731222ISI: 000309079200021ScopusID: 2-s2.0-84865103489OAI: oai:DiVA.org:kth-103779DiVA: diva2:561644
FunderTrenOp, Transport Research Environment with Novel Perspectives
QC 201210192012-10-192012-10-192013-04-10Bibliographically approved