Article
Geochemistry & Geophysics
Josue G. Gonzalez, Pratap N. Sahay, Tobias M. Muller
Summary: The missing fluid vorticity in Biot theory leads to the prediction of only one shear wave, with a noticeable filtration field at high frequencies that contradicts the no-slip condition. By incorporating the fluid viscous stress tensor, a second shear wave can be predicted, satisfying the no-slip condition and making the S-wave reflection/transmission across a discontinuity physically meaningful.
Article
Engineering, Multidisciplinary
Xiaoming Zhang, Zhi Li, Xianhui Wang, Jiangong Yu
Summary: In this study, the propagation of guided waves in a fractional order derivative viscoelastic model is investigated, with a novel mathematical approach used to simplify the solution of wave equations. The influence of different parameters on guided waves is discussed, providing a deeper understanding of the dispersive characteristics of the model.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Geochemistry & Geophysics
Ziqi Jin, Zhishui Liu, Ying Shi, Weihong Wang
Summary: Although seismic wave attenuation is frequency-dependent, most existing Q estimation methods assume that Q is constant. This limits the effective application of rock-physics Q models to link frequency-dependent Q estimations and rock properties. By employing suitable rock-physics modeling and scaling, a new frequency-dependent Q estimation method, called the two-parameters spectral ratio method, is developed. This method provides more accurate and reliable Q results by establishing a connection between rock-physic models, logging, and seismic data for better interpretation of subsurface properties.
Article
Geochemistry & Geophysics
Junxin Guo, Boris Gurevich, Xiaofei Chen
Summary: In this study, we analyze the dynamic SV-wave signatures of fluid-saturated porous rocks containing intersecting fractures. We found that the dispersion and attenuation of SV-waves have similar dependence on properties of intersecting fractures and fluid as those of P-waves, but the influence of FB-WIFF is smaller for SV-waves. In addition, WIFF and elastic scattering greatly affect the anisotropy properties of both SV- and P- waves, which are sensitive to fracture intersection angles and differ between the two types of waves. The complementary features of SV- and P- waves provide a basis for fracture intersection detection.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Materials Science, Characterization & Testing
Guangjian Gao, Caibin Xu, Han Chen, Mingxi Deng
Summary: The feasibility of characterizing the surface properties of circular tubes using the nonlinear effect of primary circumferential guided wave (CGW) propagation was investigated. The study showed that changes in the surface properties significantly affected the efficiency of second harmonic generation (SHG) in CGW propagation. The consistency of theoretical predictions, finite element simulations, and experimental results validated the feasibility of using SHG of CGW propagation to characterize changes in the surface properties of circular tubes.
NDT & E INTERNATIONAL
(2022)
Article
Mechanics
Hui Qiao, Jiangong Yu, Xiaoming Zhang, Yanwei Liu
Summary: In this paper, the propagation characteristics of guided waves in nematic elastomer hollow cylinders are investigated. The effects of circumferential order and radius-thickness ratio on dispersion and attenuation curves are discussed, and it is found that the existence of the director results in mode conversions between adjacent flexural longitudinal modes and flexural torsional modes. These results provide important guidance for the dynamic design and device analysis of cylinder-shaped nematic elastomer devices.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Geochemistry & Geophysics
Nianqi Li, Wubing Deng, Li-Yun Fu, Jose M. Carcione, Tongcheng Han
Summary: The Lord-Shulman thermoporoelasticity theory is extended to the case of double porosity, considering the effects of local heat flow and local fluid flow. Multiple slow waves are identified and their relationships with heat and fluid flow mechanisms are analyzed. The study also explores the influence of thermophysical properties on wave velocity and attenuation.
Article
Multidisciplinary Sciences
Giacomo De Carolis, Piero Olla, Francesca De Santi
Summary: This study examines the rheological properties of grease and pancake ice (GPI), the most common form of sea ice fringing Antarctica and now becoming prevalent in the Arctic. By comparing two viscous wave propagation models with observed wave attenuation, the study concludes that describing GPI as a viscous medium requires an ice viscosity that increases with thickness. Through remote sensing data and SAR image techniques, the study successfully estimates GPI thicknesses, which are validated with concurrent SMOS measurements and local samplings.
SCIENTIFIC REPORTS
(2021)
Article
Acoustics
Martin Ryzy, Istvan Veres, Thomas Berer, Michael Salfinger, Susanne Kreuzer, Guqi Yan, Edgar Scherleitner, Clemens Gruensteidl
Summary: This article presents a method for determining the longitudinal and transverse bulk acoustic wave attenuation by measuring the decay-rate of two independent zero-group-velocity resonances on a couple of matched plates. A linear relation is derived to connect the bulk-wave attenuation coefficients with the decay-rate of plate-resonances. The proposed approach is validated by calculating the responses to a thermoelastic source, and the accuracy of the obtained attenuation values is estimated to be within 10%.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2023)
Article
Materials Science, Characterization & Testing
Wenze Shi, Weiwei Chen, Chao Lu, Yao Chen
Summary: This paper proposes a method for detecting circumferential cracks by analysing two reflected SH0 guided waves, with a finite element model established and experimental validation conducted. The results show that the method provides accurate and reliable estimation of crack circumferential extent.
NONDESTRUCTIVE TESTING AND EVALUATION
(2021)
Article
Engineering, Civil
Surkay D. Akbarov, Mesut Negin
Summary: This paper studies the dispersion and attenuation of propagating waves in the plate+compressible viscous fluid layer system under different fluid layer face conditions. Analytical expressions for the amplitudes of the values are obtained, and the dispersion equation is derived using the corresponding boundary and compatibility conditions. Numerical results for various material pairs and fluid layer face conditions are presented, and conclusions on the influence of problem parameters on the dispersion and attenuation curves are made.
STRUCTURAL ENGINEERING AND MECHANICS
(2022)
Article
Multidisciplinary Sciences
A. Toffoli, J. P. A. Pitt, A. Alberello, L. G. Bennetts
Summary: This article discusses the utility of laboratory experiments for understanding wave attenuation in the marginal ice zone. It highlights the limitations of using results from regular wave tests to infer the attenuation of irregular waves, due to the highly nonlinear wave-floe interaction phenomena observed during experimental tests. The article presents two previously unreported experiments involving irregular wave tests and compares the transmission coefficients with regular wave tests. The results indicate that linear models overpredict the transmission spectra of irregular waves due to nonlinear dissipative processes.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2022)
Article
Engineering, Mechanical
Arindam Nath, Sudarshan Dhua
Summary: This study analytically investigates the shear wave propagation in a piezo-electro-magnetic medium (PEMM) due to a point source disturbance using the Green's function technique. The composite structure consists of a PEMM layer with a viscoelastic film coating, resting on a functionally graded half-space. By combining Green's function with Fourier transformation, the dispersion equation of the shear wave is derived, which defines the phase velocity and attenuation characteristics. Numerical simulations and graphical illustrations are used to analyze the effects of various parameters, such as functional grading, viscoelasticity, and piezo-electro-magnetic coupling, on the phase velocity and attenuation coefficient. It is concluded that the viscoelastic coating significantly affects the velocity and attenuation of the wave.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Acoustics
Xiaohu Liang, Bin Lin, Zaiwei Liu, Xiaokang Ma
Summary: The research investigates the influence of surface roughness on the dispersion and attenuation of surface acoustic wave (SAW) and finds that surface roughness has a significant impact on both dispersion and attenuation.
Article
Engineering, Civil
Anchen Ni, Zhifei Shi, Qingjuan Meng, C. W. Lim
Summary: This study proposes a novel shallow buried periodic in-filled pipe barrier for mitigating surface waves. Through complex dispersion analysis, numerical simulations, and lab-scale experiments, the effectiveness and robustness of the barrier in attenuating surface waves are verified. The energy dissipation induced by material damping and local resonance of in-filled pipes contribute to wave attenuation. The feasibility of these novel wave barriers for mitigating train-induced vibrations is also preliminarily verified.
ENGINEERING STRUCTURES
(2023)