Mesh-independent ray-trace algorithm for concrete structure

Kobayashi, Yoshikazu

doi:10.1016/j.conbuildmat.2013.07.003

Cited by 17 publications

(12 citation statements)

References 6 publications

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“…The core idea behind the implementation of ray tracing for AE waves is to trace the physical path of the wave. 29,30 To do this, the first step toward path reconstruction is to discretize the material into smaller grids. Within the grid, nodes corresponding to the sensor and source are assigned.…”

Section: Tomographic Reconstruction With Aementioning

confidence: 99%

Fast Tomography: A greedy, heuristic, mesh size–independent methodology for local velocity reconstruction for AE waves in distance decaying environment in semi real-time

Das

Leung

2021

Structural Health Monitoring

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Tomographic reconstruction is an important step toward visualization, identification and quantification of local damage through of structural elements. We have developed mathematical guiding principles for passive wave tomography. We have then utilized these guiding principles to develop a novel technique: Fast Tomography for computational and information efficiency in tomographic reconstruction with passive stress waves in a distance decaying (sensing) environment. In fast tomography, (i) a node-independent travel path is developed for computational efficiency and (ii) Apriori ranking of AE events using power spectral entropy (PSE) of the AE waveform to distinguish waveforms with high information content for tomographic reconstruction for information efficiency are proposed. Fast Tomography was studied theoretically and experimentally to benchmark the proposed method in terms of computational and information efficiency. Our algorithm provides a significant (>100x) improvement of computational efficiency over an existing approach. And a PSE-based ranking system for AE events enhances information efficiency by 50% as compared to a non-ranked system. Finally, we have validated the application of our method with intractably generated AE events in an accelerated damage test of a steel fiber–reinforced concrete beam.

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Section: Tomographic Reconstruction With Aementioning

confidence: 99%

Fast Tomography: A greedy, heuristic, mesh size–independent methodology for local velocity reconstruction for AE waves in distance decaying environment in semi real-time

Das

Leung

2021

Structural Health Monitoring

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“…The prior art of acoustic emission (AE) testing is a wellestablished nondestructive method for the above purpose [18] and has been widely applied to study the deterioration and failure of stressed materials [19][20][21][22][23][24][25][26][27]. An acoustic wave in granular soils generally stems from particle interactions such as particle sliding or crushing.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Behavior of Granular Soils Characterized by Acoustic Emission

et al. 2021

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The study of failure mechanisms from a microperspective demands a comprehensive understanding of the initiation and evolution of shear banding within granular materials. However, this topic is not fully understood due to the technical constraints in continuous quantification of the failure degree and visualization of particle interactions within soil specimens due to their inherent opacity. This paper reports the possibility of acoustic emission (AE) technique in characterizing the micromechanical behavior of saturated coral sands subjected to drained triaxial shearing. Results show that coral sand is less emissive than silica sands, while its AE rate forms concrete mathematic relations with soil mechanical parameters, which agrees with those revealed for silica sands. This allows soil mechanical parameters of coral sands that are difficult to be assessed in the field to be back-evaluated by acoustic measuring. The traced AE source locations confirm their spatiotemporal correspondence with the photographed appearance of deformed specimens, in which complex shear banding process, regarding the initiation and evolution, is traced. Three acoustic precursors are observed before the complete soil failure and are considered resulting from the structural variation that affects the emission and propagation of AEs, which hence could be used as indicators for early warning of soil’s instability.

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“…Each of the above mentioned techniques can be used for specific conditions. For example, IE can be used to find out the thickness of different layers of medium, or PEC can be utilized for surface crack detection, whereas the EWT technique uniquely facilitates visualization inspection so that anomalous regions or distribution of physical properties in the measured object can be visualized [ 9 ]. Therefore, it can be utilized to evaluate the soundness of a concrete medium by analyzing the changes in stress wave propagation.…”

Section: Introductionmentioning

confidence: 99%

“…The techniques iteratively update the velocity distribution to minimize the difference between theoretical and observed travel time, for obtaining the optimum wave velocity distribution. To obtain the theoretical velocity, the ray trace technique is employed to acquire the travel time and distance of the wave [ 9 , 14 ]. Apart from those studies dedicated to the development of identification techniques [ 9 ], there are other imperative concerns which have been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…To obtain the theoretical velocity, the ray trace technique is employed to acquire the travel time and distance of the wave [ 9 , 14 ]. Apart from those studies dedicated to the development of identification techniques [ 9 ], there are other imperative concerns which have been investigated. For instance, the excitation source characteristic showed a significant influence on the waves’ velocity distribution tomogram.…”

Section: Introductionmentioning

confidence: 99%

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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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Mesh-independent ray-trace algorithm for concrete structure

Cited by 17 publications

References 6 publications

Fast Tomography: A greedy, heuristic, mesh size–independent methodology for local velocity reconstruction for AE waves in distance decaying environment in semi real-time

Fast Tomography: A greedy, heuristic, mesh size–independent methodology for local velocity reconstruction for AE waves in distance decaying environment in semi real-time

Micromechanical Behavior of Granular Soils Characterized by Acoustic Emission

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

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