Coupled Waveform Analysis in Dynamic Characterization of Lossy Solids
Publication: Journal of Engineering Mechanics
Volume 128, Issue 4
Abstract
By means of the viscoelastic wave propagation model for a homogeneous semi-infinite solid, a rational analytical and computational framework is developed for nonintrusive, wave-based characterization of lossy media. The problem of estimating the equivalent uniform material properties from surface observations is formulated in the Bayesian setting for two canonical testing configurations, one involving a vertically and the other a horizontally polarized wave field. By enhancing the treatment of the inverse problem through a fully coupled viscoelastic analysis of the observed waveforms, the method provides consistent estimates of the in situ material stiffness, damping, and density which are not available from conventional seismic interpretations. For a rigorous treatment of the gradient search technique employed by the inverse solution, the necessary derivatives of the predictive model are evaluated analytically. A set of results with noise-contaminated synthetic measurements is included to highlight several key features of the back analysis.
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Information
Published In
Journal of Engineering Mechanics
Volume 128 • Issue 4 • April 2002
Pages: 392 - 402
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Aug 10, 2000
Accepted: Jul 30, 2001
Published online: Apr 1, 2002
Published in print: Apr 2002
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