scholarly journals Interaction of elastic waves with ice layer in shelf zone

2019 ◽  
Vol 127 ◽  
pp. 02013 ◽  
Author(s):  
Vladimir Korochentsev ◽  
Jingwei Yin ◽  
Anastasiya Viland ◽  
Tatyana Lobova ◽  
Natalia Soshina
Keyword(s):  
Theoretical Model ◽  
Elastic Wave ◽  
Helmholtz Equation ◽  
Elastic Waves ◽  
Function Theory ◽  
Shelf Zone ◽  
Wave Interactions ◽  
Wave Fields ◽  
Calculation Algorithms ◽  
Propagation Of Elastic Waves

A theoretical model for the propagation of elastic waves of arbitrary wave sizes from 0.5 to 20 units in an ice layer has been developed. The calculation was based on Green’s function theory for Helmholtz equation. Special “directed” Green’s functions were introduced. They make it possible to anayze wave fields in closes volumes limited by different-angle impedances. The developed calculation algorithms allow one to anayze fields on medium-powered computers for 15 minutes. The suggested methods are capable of estimating elastic wave interactions with different impedances in bays, lakes and other volumes with limited wave sizes.

Identification of the interface between acoustic and elastic waves from internal measurements

2020 ◽  
Vol 28 (3) ◽  
pp. 313-322
Author(s):  
Yanli Cui ◽  
Fenglong Qu
Keyword(s):  
Boundary Conditions ◽  
Elastic Wave ◽  
Uniqueness Theorem ◽  
Elastic Waves ◽  
Wave Fields ◽  
Fluid Solid Interaction ◽  
Interaction Problem ◽  
Penetrable Boundary ◽  
Interior Transmission Problem

AbstractConsider the fluid-solid interaction problem for a two-layered non-penetrable cavity. We provide a novel fundamental proof for a uniqueness theorem on the determination of the interface between acoustic and elastic waves from many internal measurements, disregarding the boundary conditions imposed on the exterior non-penetrable boundary. The proof depends on a uniform {H^{1}}-norm boundedness for the elastic wave fields and the construction of the coupled interior transmission problem related to the acoustic and elastic wave fields.

PROPAGATION OF ELASTIC WAVES IN THE EARTH

Geophysics ◽  
1940 ◽  
Vol 5 (1) ◽  
pp. 1-14 ◽  
Author(s):  
L. G. Howell ◽  
C. H. Kean ◽  
R. R. Thompson
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
Elastic Waves ◽  
Single Frequency ◽  
Near Surface ◽  
Proper Understanding ◽  
The Earth ◽  
Considerable Research ◽  
Continuous Waves ◽  
Propagation Of Elastic Waves

An investigation of elastic‐wave propagation in near‐surface materials using single‐frequency continuous waves and pulses, over a range of 20 to 1400 cycles, is described. While only touching upon the diverse problems involved in a study of this kind the results indicate a complexity requiring considerable research if a proper understanding, commensurate with the importance of the problem, is to be attained.

scholarly journals Numerical Modelling and Optimization of Two-Dimensional Phononic Band Gaps in Elastic Metamaterials with Square Inclusions

2021 ◽  
Vol 11 (7) ◽  
pp. 3124
Author(s):  
Alya Alhammadi ◽  
Jin-You Lu ◽  
Mahra Almheiri ◽  
Fatima Alzaabi ◽  
Zineb Matouk ◽  
...  
Keyword(s):  
Elastic Wave ◽  
Tungsten Carbide ◽  
Composite Structure ◽  
Elastic Waves ◽  
Wave Attenuation ◽  
Low Frequency ◽  
Filling Fraction ◽  
Carbide Composite ◽  
Elastic Metamaterials ◽  
Tungsten Carbide Composite

A numerical simulation study on elastic wave propagation of a phononic composite structure consisting of epoxy and tungsten carbide is presented for low-frequency elastic wave attenuation applications. The calculated dispersion curves of the epoxy/tungsten carbide composite show that the propagation of elastic waves is prohibited inside the periodic structure over a frequency range. To achieve a wide bandgap, the elastic composite structure can be optimized by changing its dimensions and arrangement, including size, number, and rotation angle of square inclusions. The simulation results show that increasing the number of inclusions and the filling fraction of the unit cell significantly broaden the phononic bandgap compared to other geometric tunings. Additionally, a nonmonotonic relationship between the bandwidth and filling fraction of the composite was found, and this relationship results from spacing among inclusions and inclusion sizes causing different effects on Bragg scatterings and localized resonances of elastic waves. Moreover, the calculated transmission spectra of the epoxy/tungsten carbide composite structure verify its low-frequency bandgap behavior.

A CALIBRATED MODEL SEISMIC SYSTEM

Geophysics ◽  
1972 ◽  
Vol 37 (3) ◽  
pp. 445-455 ◽  
Author(s):  
C. N. G. Dampney ◽  
B. B. Mohanty ◽  
G. F. West
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
Elastic Waves ◽  
Critical Examination ◽  
Two Dimensional ◽  
Linear Filtering ◽  
Analog Model ◽  
Basic Assumptions ◽  
Electronic Circuitry ◽  
Seismic System

Simple electronic circuitry and axially polarized ceramic transducers are employed to generate and detect elastic waves in a two‐dimensional analog model. The absence of reverberation and the basic simplicity. of construction underlie the advantages of this system. If the form of the fundamental wavelet in the model itself, as modified by the linear filtering effects of the remainder of the system, can be found, then calibration is achieved. This permits direct comparison of theoretical and experimental seismograms for a given model if its impulse response is known. A technique is developed for calibration and verified by comparing Lamb’s theoretical and experimental seismograms for elastic wave propagation over the edge of a half plate. This comparison also allows a critical examination of the basic assumptions inherent in a model seismic system.

scholarly journals Propagation of Elastic Waves in Prestressed Media

2010 ◽  
Vol 2010 ◽  
pp. 1-11 ◽  
Author(s):  
Inder Singh ◽  
Dinesh Kumar Madan ◽  
Manish Gupta
Keyword(s):  
Elastic Waves ◽  
Plane Waves ◽  
Dynamical Equations ◽  
P Waves ◽  
General Solutions ◽  
External Forces ◽  
Propagation Of Elastic Waves

3D solutions of the dynamical equations in the presence of external forces are derived for a homogeneous, prestressed medium. 2D plane waves solutions are obtained from general solutions and show that there exist two types of plane waves, namely, quasi-P waves and quasi-SV waves. Expressions for slowness surfaces and apparent velocities for these waves are derived analytically as well as numerically and represented graphically.

Parametrization of the Propagation of Elastic Waves in a Medium with Ensembles of Disc-Shaped Inclusions

2018 ◽  
Vol 54 (1) ◽  
pp. 130-137 ◽  
Author(s):  
V. V. Mykhas’kiv ◽  
Ya. І. Kunets’ ◽  
V. V. Маtus ◽  
О. V. Burchak ◽  
О. К. Balalaev
Keyword(s):  
Elastic Waves ◽  
Propagation Of Elastic Waves
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