QVOA techniques for fracture characterization

Sabinin, Vladimir

doi:10.1016/s0016-7169(13)71479-x

Cited by 6 publications

(8 citation statements)

References 21 publications

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“…Five numerical techniques for estimating the symmetry axis azimuth using QVOA were proposed in [8]. Three of them, the general technique (G), the truncated technique (T), and the sectored technique (S), are based on (1)- (2).…”

Section: Overview Of Qvoa Techniquesmentioning

confidence: 99%

“…Application of the least-squares method to (8) gives a nonlinear system of 12 equations, which is solved similarly to Gd (see Appendix). The improved technique thus obtained (which is an enhanced version of the generalized technique) will be called EGd-enhanced Gd.…”

Section: Qvoa Techniquesmentioning

confidence: 99%

“…They gave the values of the factor in the range of 16-26. One can see the example of calculated seismogram in [8]. Such replacement of the full 3D picture of waves by a "fan" of 2D pictures of waves is undoubtedly an approximation and should worsen the results of evaluation of 0 .…”

Section: Numerical Experiments For Comparison Of the Qvoa Techniquesmentioning

confidence: 99%

“…A number of efficient numerical QVOA techniques were proposed in [8]. The present paper proposes several additional techniques.…”

Section: Introductionmentioning

confidence: 99%

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QVOA Techniques for Estimation of Fracture Directions

Sabinin

2018

International Journal of Geophysics

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Some new computational techniques are suggested for estimating symmetry axis azimuth of fractures in the viscoelastic anisotropic target layer in the framework of QVOA analysis (Quality factor Versus Offset and Azimuth). The different QVOA techniques are compared using synthetic viscoelastic surface reflected data with and without noise. I calculated errors for these techniques which depend on different sets of azimuths and intervals of offsets. Superiority of the high-order "enhanced general" and "cubic" techniques is shown. The high-quality QVOA techniques are compared with one of the high-quality AVOA techniques (Amplitude Versus Offset and Azimuth) in the synthetic data with noise and attenuation. Results are comparable.

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Section: Overview Of Qvoa Techniquesmentioning

confidence: 99%

Section: Qvoa Techniquesmentioning

confidence: 99%

Section: Numerical Experiments For Comparison Of the Qvoa Techniquesmentioning

confidence: 99%

“…A number of efficient numerical QVOA techniques were proposed in [8]. The present paper proposes several additional techniques.…”

Section: Introductionmentioning

confidence: 99%

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QVOA Techniques for Estimation of Fracture Directions

Sabinin

2018

International Journal of Geophysics

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“…On the other hand, intrinsic attenuation or absorption is because of internal friction of the material. Attenuation of elastic waves is highly governed by the inelastic properties of the medium, while the travel time of the elastic wave depends on the elastic properties and medium density [26,27,28,29,30]. …”

Section: Tomogramsmentioning

confidence: 99%

Development of a Tomography Technique for Assessment of the Material Condition of Concrete Using Optimized Elastic Wave Parameters

et al. 2016

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Concrete is the most ubiquitous construction material. Apart from the fresh and early age properties of concrete material, its condition during the structure life span affects the overall structural performance. Therefore, development of techniques such as non-destructive testing which enable the investigation of the material condition, are in great demand. Tomography technique has become an increasingly popular non-destructive evaluation technique for civil engineers to assess the condition of concrete structures. In the present study, this technique is investigated by developing reconstruction procedures utilizing different parameters of elastic waves, namely the travel time, wave amplitude, wave frequency, and Q-value. In the development of algorithms, a ray tracing feature was adopted to take into account the actual non-linear propagation of elastic waves in concrete containing defects. Numerical simulation accompanied by experimental verifications of wave motion were conducted to obtain wave propagation profiles in concrete containing honeycomb as a defect and in assessing the tendon duct filling of pre-stressed concrete (PC) elements. The detection of defects by the developed tomography reconstruction procedures was evaluated and discussed.

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