Efficiency parameters in time reversal acoustics: Applications to dispersive media and multimode wave propagation

Núñez, I.; Negreira, Carlos

doi:10.1121/1.1856272

Cited by 17 publications

(7 citation statements)

References 13 publications

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“…Some thermoelastic techniques, involving high power laser pulses incident on the surface of the specimen, have been used in TRA experiments[55,56], especially for the generation of surface sound/ultrasound waves, but they are not feasible for all types of TRA experiments with solid media.…”

mentioning

confidence: 99%

Investigation of the robustness of time reversal acoustics in solid media through the reconstruction of temporally symmetric sources

Griffa¹,

Anderson²,

Guyer³

et al. 2008

J. Phys. D: Appl. Phys.

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We investigate some of the limitations of time reversal acoustics (TRA) in solid media with transducers attached to the surface. In particular, we consider the limitations due to the finite size of the transducers and elastic wave propagation. Using a theoretical approach, numerical simulations and validation from laboratory ultrasound experiments, we find that finite size transducers and the existence of longitudinal and shear waves play significant roles in perturbing the time reversal process. Despite these limitations, we show that TRA in solids is very robust, providing the means to reconstruct the main features of the source signal. The analysis of TRA retro-focusing properties in solid specimens is of foremost importance for the development of new non-destructive evaluation techniques.

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mentioning

confidence: 99%

Investigation of the robustness of time reversal acoustics in solid media through the reconstruction of temporally symmetric sources

Griffa¹,

Anderson²,

Guyer³

et al. 2008

J. Phys. D: Appl. Phys.

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show abstract

“…Depending on the basic time reversal theory of Lamb wave propagating on plate-like structures, the modulus value of the synthesis signal reaches the maximum at the position C because all the time reversed signals arrive at the source point at the same time and add together due to the spatial reciprocity and time reversal invariance of linear wave equations (Núñez and Negreira, 2005; Park et al, 2007, 2009; Wang et al, 2004).…”

Section: Phase Synthesis–based Time Reversal Focusing and Imaging Methodsmentioning

confidence: 99%

On research of a phase synthesis time reversal focusing method for damage imaging of complex composite structures

Zixue

Qiu

Jiang

et al. 2012

Journal of Intelligent Material Systems and Structures

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Time reversal focusing method has been proved to be an effective method for active Lamb wave–based structural health monitoring. In this article, aiming at developing a practical method for online localization of damage on aircraft composite structures that can take advantage of time reversal focusing and do not rely on the transfer function, a phase synthesis–based time reversal focusing method was proposed. In this method, damage images are given out directly through time reversal focusing, and the other imaging processes such as the delay-and-sum imaging method adopted in many researches of time reversal focusing are not needed. Based on the damage imaging method, a structural health monitoring demonstration system was built on a composite panel of an aircraft wing box with many bolt holes and stiffeners. The demonstrated results show that this method can estimate the positions of damages efficiently with a low sensitivity of group velocity errors and a high antijamming capability.

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“…The term of |H(ω, r)| 2 is a real positive even function. Depending on the basic time reversal theory of Lamb wave propagating on plate-like structure, the modulus value of the synthesis signal reaches the maximum at the position C because all the time reversed signals arrive at the source point at the same time and add together because of the spatial reciprocity and time-reversal invariance of linear wave equations [11,12,19].…”

Section: The Phase Synthesis Time Reversal Focusing Lamb Wave Source mentioning

confidence: 99%

“…The 24 PZTs are used to construct the PZTs array shown in Fig. 11 to fulfill the damage imaging task and the PZT 1,7,19,20,22,16,4 and 3 are used to fulfill the impact imaging task. The sizes of impact and damage monitoring areas constructed by the PZT layers are 410 mm × 450 mm and 460 mm × 800 mm, respectively.…”

Section: Shm Demonstartion Systemmentioning

confidence: 99%

On research of time reversal imaging method and structural health monitoring system

Qiu

Yuan

2014

International Journal of Applied Electromagnetics and Mechanics

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Structural health monitoring (SHM) technology is a reliable, efficient and economical approach to increase the safety and reduce the maintenance cost of high performance structures. Among the existing SHM methods, piezoelectric transducers (PZTs) array and Lamb wave based SHM methods are sensitive to small damage and studied by many researchers. In this paper, aiming at developing a practical method for on-line localization of damage and impact on aircraft composite structure which can take advantage of time reversal focusing and does not rely on the transfer function, a phase synthesis based time reversal focusing method is proposed and a twin-PZTs array arrangement based damage imaging method is discussed. In this method, damage and impact images are given out directly through time reversal focusing and the other imaging processes such as the delay-and-sum imaging method adopted in many researches of time reversal focusing are not needed. And then, a kind of PZTs layer (PSL) with electromagnetic shielding is developed. For real application of SHM, an integrated multi-channel scanning system (ISS) with impact and damage monitoring function is developed thirdly. The ISS can scan large numbers of actuatorsensor channels and estimate impact and damage automatically. Finally, A SHM demonstration system is built on a carbon fiber composite panel with many bolt holes and stiffeners of an aircraft wing box based on the damage and impact imaging method, the PSL and the ISS. The demonstrating results show good performance of the whole SHM system.

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Efficiency parameters in time reversal acoustics: Applications to dispersive media and multimode wave propagation

Cited by 17 publications

References 13 publications

Investigation of the robustness of time reversal acoustics in solid media through the reconstruction of temporally symmetric sources

Investigation of the robustness of time reversal acoustics in solid media through the reconstruction of temporally symmetric sources

On research of a phase synthesis time reversal focusing method for damage imaging of complex composite structures

On research of time reversal imaging method and structural health monitoring system

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