Numerical simulation of the interaction of laser-generated Rayleigh waves with subsurface cracks

2018 ◽  
Vol 124 (9) ◽  
Author(s):  
Chuanyong Wang ◽  
Anyu Sun ◽  
Xiaoyu Yang ◽  
Bing-Feng Ju ◽  
Yongdong Pan
Keyword(s):  
Numerical Simulation ◽  
Rayleigh Waves ◽  
Subsurface Cracks

Reference free imaging of subsurface cracks in concrete using Rayleigh waves

2018 ◽  
Vol 25 (10) ◽  
pp. e2246 ◽  
Author(s):  
Debdutta Ghosh ◽  
Surendra Beniwal ◽  
Abhijit Ganguli ◽  
Abhijit Mukherjee
Keyword(s):  
Rayleigh Waves ◽  
Subsurface Cracks

scholarly journals MATHEMATICAL MODELING OF NON-STATIONARY ELASTIC WAVES STRESSES UNDER A CONCENTRATED VERTICAL EXPOSURE IN THE FORM OF DELTA FUNCTIONS ON THE SURFACE OF THE HALF-PLANE (LAMB PROBLEM)

2019 ◽  
Vol 15 (2) ◽  
pp. 111-124
Author(s):  
Vyacheslav Musayev
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Free Surface ◽  
Boundary Conditions ◽  
Half Plane ◽  
Rayleigh Waves ◽  
The Finite Element Method ◽  
Initial And Boundary Conditions ◽  
Element Method

The problem of numerical simulation of longitudinal, transverse and surface waves on the free surface of an elastic half-plane is considered. The change of the elastic contour stress on the free surface of the half­plane is given. To solve the two-dimensional unsteady dynamic problem of the mathematical theory of elasticity with initial and boundary conditions, we use the finite element method in displacements. Using the finite element method in displacements, a linear problem with initial and boundary conditions resulted in a linear Cauchy prob­lem. Some information on the numerical simulation of elastic stress waves in an elastic half-plane under concen­trated wave action in the form of a Delta function is given. The amplitude of the surface Rayleigh waves is sig­nificantly greater than the amplitudes of longitudinal, transverse and other waves with concentrated vertical ac­tion in the form of a triangular pulse on the surface of the elastic half-plane. After the surface Rayleigh waves there is a dynamic process in the form of standing waves.

Numerical simulation for recognition of coalfield fire areas by Rayleigh waves

2013 ◽  
Vol 23 (1) ◽  
pp. 27-31 ◽  
Author(s):  
Mingshun Hu ◽  
Dongming Pan ◽  
Shenen Chen ◽  
Shouhua Dong ◽  
Juanjuan Li
Keyword(s):  
Numerical Simulation ◽  
Rayleigh Waves

Analysis of Influencing Factors and Numerical Simulation of Horizontal-to-Vertical Spectral Ratio Method

2019 ◽  
Vol 14 (01) ◽  
pp. 2050004
Author(s):  
Du Qingling ◽  
Liu Zhengping ◽  
Liu Shijie
Keyword(s):  
Numerical Simulation ◽  
Rayleigh Wave ◽  
Influencing Factors ◽  
Phase Difference ◽  
Rayleigh Waves ◽  
Body Wave ◽  
Spectral Ratio ◽  
The Body ◽  
Hvsr Method ◽  
Different Sources

To improve the calculation accuracy of the horizontal-to-vertical spectral ratio (HVSR) method, this study theoretically analyzed the influencing factors of Rayleigh wave polarizability. The phase difference of the horizontal component and the phase difference of the vertical component are found to play a key role in calculating the polarizability. The influence mechanism of the superposition of body waves and different Rayleigh waves on the polarizability of the Rayleigh wave is derived. The effects of the body wave, amplitude, frequency and Rayleigh wave superposition of different sources on the polarizability are verified by numerical simulation. The results show that the body wave significantly interferes with the polarizability of the Rayleigh wave. When a signal contains more than one set of Rayleigh waves, the superposition of the same-source Rayleigh waves does not affect the ratio. However, the superposition of Rayleigh waves from different sources significantly interferes with the calculation of the polarizability. This provides a technical method and a theoretical basis for accurately extracting the Rayleigh wave polarizability dispersion curve from a seismic record signal. This would help improve the detection accuracy of the HVSR method for ground pulse signals.

Analysis of dispersion curves of Rayleigh waves in the frequency–wavenumber domain

2004 ◽  
Vol 41 (4) ◽  
pp. 583-598 ◽  
Author(s):  
Laiyu Lu ◽  
Bixing Zhang
Keyword(s):  
Numerical Simulation ◽  
Surface Waves ◽  
Key Words ◽  
Relative Error ◽  
Spectrum Analysis ◽  
Rayleigh Waves ◽  
Dispersion Curves ◽  
Propagation Characteristics ◽  
Wavenumber Domain ◽  
Analysis Of Dispersion

The method of spectrum analysis of surface waves (SASW) is discussed briefly. The analysis of the dispersion curves of Rayleigh waves in the frequency–wavenumber (f–k) domain is suggested due to the problems encountered in SASW. Three models of the layered media are considered according to typical situations in practice. All the modes that can be effectively excited are analyzed. The excitation and propagation characteristics of the Rayleigh waves are investigated by numerical simulation. The effects of some parameters such as number of channels and distance (s) between the source and the first receiver on the dispersion curves are investigated in detail for three models. Some important results about the number of receiver channels, relative error, mode jumping, and other aspects are obtained. It is found that reliable dispersion curves can be obtained by f–k analyses when the distance between the first receiver and the source is greater than one half the wavelength (0.5λ).Key words: dispersion curves, Rayleigh waves, SASW, frequency–wavenumber domain, mode jumping.

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake
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