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Parametric modeling with beamspread compensation and MIMO frequency domain inversion applied to fine saturated sands
S Vandenplas1, A B Temsamani, M L Lumori
1Department of ELEC, Vrije Universiteit Brussel, B-1050, Belgium. jsvdplas@vub.ac.be
Summary
This study estimates sediment properties like absorption and dispersion using system identification. The findings offer insights into wave propagation through porous materials.
Area of Science:
- Geophysics
- Acoustics
- Materials Science
Background:
- Accurate characterization of sediment properties is crucial for understanding wave propagation.
- Traditional methods may not fully capture the complex behavior of wave interaction with porous media.
Purpose of the Study:
- To estimate the intrinsic absorption and dispersion of fine sands using a system identification technique.
- To compare the effectiveness of different porous models, including the viscoelastic constant Q and viscoelastic rational form models.
Main Methods:
- Parametric modeling of wave propagation through a sediment-filled Plexiglas tank.
- Utilizing Debye series expansions with correction coefficients for beamspread.
- Employing a multiple input multiple output (MIMO) representation with a maximum likelihood estimator (MLE).
Main Results:
- Successful estimation of absorption and dispersion curves for fine sands.
- Comparison of different viscoelastic models for describing wave propagation.
- Quantification of sediment parameters through advanced system identification.
Conclusions:
- The system identification technique provides a robust method for characterizing sediment acoustic properties.
- The study highlights the importance of considering beamspread effects in wave propagation models.
- The findings contribute to a better understanding of acoustic wave interaction with granular materials.