Energy flux imaging method for time reversal in elastic media.

2009 ◽  
Vol 125 (4) ◽  
pp. 2521-2521
Author(s):  
Brian E. Anderson ◽  
Robert A. Guyer ◽  
Timothy J. Ulrich ◽  
Pierre‐Yves Le Bas ◽  
Carene Larmat ◽  
...  
Keyword(s):  
Energy Flux ◽  
Time Reversal ◽  
Imaging Method ◽  
Elastic Media

scholarly journals Energy current imaging method for time reversal in elastic media

2009 ◽  
Vol 95 (2) ◽  
pp. 021907 ◽  
Author(s):  
Brian E. Anderson ◽  
Robert A. Guyer ◽  
Timothy J. Ulrich ◽  
Pierre-Yves Le Bas ◽  
Carène Larmat ◽  
...  
Keyword(s):  
Time Reversal ◽  
Imaging Method ◽  
Elastic Media ◽  
Energy Current

An imaging method for the covered damage region of strand wire based on dual time reversal using piezoceramic transducers

2017 ◽  
Vol 26 (10) ◽  
pp. 104005 ◽  
Author(s):  
Hong Xiaobin ◽  
Zhou Jianxi ◽  
Lin Peisong ◽  
Huang Guojian
Keyword(s):  
Time Reversal ◽  
Imaging Method

Hybrid multiplicative time-reversal imaging reveals the evolution of microseismic events: Theory and field-data tests

Geophysics ◽  
2019 ◽  
Vol 84 (3) ◽  
pp. KS71-KS83 ◽  
Author(s):  
Tieyuan Zhu ◽  
Junzhe Sun ◽  
Davide Gei ◽  
José M. Carcione ◽  
Philippe Cance ◽  
...  
Keyword(s):  
High Resolution ◽  
Time Reversal ◽  
Field Data ◽  
Source Area ◽  
Spatiotemporal Distribution ◽  
Source Image ◽  
Imaging Method ◽  
Source Imaging ◽  
Receiver Array ◽  
Microseismic Events

The generation of microseismic events is often associated with induced fractures/faults during the extraction/injection of fluids. A full characterization of the spatiotemporal distribution of microseismic events provides constraints on fluid migration paths in the formations. We have developed a high-resolution source imaging method — a hybrid multiplicative time-reversal imaging (HyM-TRI) algorithm, for automatically tracking the spatiotemporal distribution of microseismic events. HyM-TRI back propagates the data traces from groups of receivers (in space and time) as receiver wavefields, multiplies receiver wavefields between all groups, and applies a causal integration over time to obtain a source evolution image. Using synthetic and field-data examples, we revealed the capability of the HyM-TRI technique to image the spatiotemporal sequence of asynchronous microseismic events, which poses a challenge to standard TRI methods. Moreover, the HyM-TRI technique is robust enough to produce a high-resolution image of the source in the presence of noise. The aperture of the 2D receiver array (azimuth coverage in 3D) with respect to the microseismic source area plays an important role on the horizontal and vertical resolution of the source image. The HyM-TRI results of the field data with 3D azimuthal coverage further verify our argument by producing a superior resolution of the source than TRI.

scholarly journals Time reversal of continuous-wave, steady-state signals in elastic media

2009 ◽  
Vol 94 (11) ◽  
pp. 111908 ◽  
Author(s):  
Brian E. Anderson ◽  
Robert A. Guyer ◽  
Timothy J. Ulrich ◽  
Paul A. Johnson
Keyword(s):  
Steady State ◽  
Time Reversal ◽  
Continuous Wave ◽  
Elastic Media

A Time Reversal Imaging Method without Relying on Transfer Function for Impact and Damage Monitoring of Composite Structures

2013 ◽  
Vol 330 ◽  
pp. 542-548
Author(s):  
Lei Qiu ◽  
Shen Fang Yuan ◽  
Tian Xiang Huang
Keyword(s):  
Transfer Function ◽  
Time Reversal ◽  
Lamb Wave ◽  
Composite Structures ◽  
Structural Damage ◽  
Composite Panel ◽  
Synthesis Process ◽  
Propagation Mechanism ◽  
Imaging Method ◽  
Phase Synthesis

Composite structures adopted in aerospace structures have attracted much interest to structural health monitoring (SHM) for localization of impact and damage positions due to their poor impact resistance properties. Propagation mechanism and frequency dispersion characteristics of Lamb wave signals on composite structures are more complicated than that on simple aluminum plates. Recently, much attention has been paid to the research of time reversal focusing method because this method shows a promising advantage to give a focusing image of the structural damage, improve the signal-to-noise ratio and compensate the dispersion of Lamb wave signals. In this paper, aiming at developing a practical method for on-line localization of impact and damage on aircraft composite structures which can take advantage of time reversal focusing and does not rely on the transfer function, a new phase synthesis based time reversal focusing method is proposed. Impact and damage images are given out directly through time reversal focusing based on phase synthesis process of the signals. A SHM demonstration system is built on a composite panel of an aircraft wing box with many bolt holes and stiffeners using the phase synthesis based time reversal focusing method. The demonstration results show that this method can estimate the positions of impact and damage efficiently with a low sensitivity of velocity errors.

A time reversal damage imaging method for structure health monitoring using Lamb waves

2010 ◽  
Vol 19 (11) ◽  
pp. 114301 ◽  
Author(s):  
Hai-Yan Zhang ◽  
Ya-Ping Cao ◽  
Xiu-Li Sun ◽  
Xian-Hua Chen ◽  
Jian-Bo Yu
Keyword(s):  
Health Monitoring ◽  
Time Reversal ◽  
Lamb Waves ◽  
Imaging Method ◽  
Structure Health Monitoring ◽  
Damage Imaging

scholarly journals Acoustic Emission Localization in a Composite Stiffened Panel Using a Time Reversal Algorithm

2011 ◽  
Vol 471-472 ◽  
pp. 910-915
Author(s):  
Francesco Ciampa ◽  
Michele Meo
Keyword(s):  
Acoustic Emission ◽  
Time Reversal ◽  
Mode Conversion ◽  
Research Work ◽  
Composite Panel ◽  
Computational Time ◽  
Stiffened Panel ◽  
Imaging Method ◽  
Impact Point ◽  
The Impact

This research work presents an in-situ imaging method for the localization of the impact point in complex anisotropic structures with diffuse field conditions, using only one passive transducer. The proposed technique is based on the time reversal approach applied to a number of waveforms stored into a database containing the experimental Green’s function of the medium. The present method exploits the benefits of multiple scattering, mode conversion and boundaries reflections to achieve the focusing of the source with high resolution. The optimal re-focusing of the back propagated wave field at the impact point is accomplished through a “virtual” imaging process, which does not require any iterative algorithms and a priori knowledge of the mechanical properties of the structure. The robustness of the time reversal method is experimentally demonstrated on a stiffened composite panel and the source position can be retrieved with a high level of accuracy (error less than 3%). The simple configuration, minimal processing requirements and computational time (less than 1 sec) make this method a valid alternative to the conventional imaging structural health monitoring systems for the acoustic emission source localization.

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