Browsing by Subject "viscoelastic material"

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Access status: Open Access ,
Determination of damping properties of layered structures by means of wave-propagation-based methods
(Wydawnictwa AGH, 2005) Rak, Michał Bartosz; Ichchou, Mohamed; Holnicki-Szulc, Jan
Problem of estimation of damping parameters of a structure by analysis of wave propagation in the structure, is addressed. The task is formulated for a cantilever multi-layer beam undergoing random excitation. Since different methods of solution of the problem have been developed the need arises to discuss and compare results obtained by means of the latter ones. Stress is laid on Inhomogenous Wave Correlation method based on analysis of wave field with damping included. Experimental tests are conducted to ensure objectivity of the obtained results. Case of a single-layer beam is investigated first in order to validate the theoretical model used subsequently in studies of sandwich structures. In analysis of multi-layer beams, two arrangements of layers inducing different damping mechanisms, namely free layer damping and constrained layer damping, are taken into account. Discussion on a physical interpretation of the determined damping parameters closes the study.