A simplified Time Reversal method used to localize vibrations sources in a complex structure

Vigoureux, Dorian; Guyader, Jean‐Louis

doi:10.1016/j.apacoust.2011.12.004

Cited by 24 publications

(5 citation statements)

References 9 publications

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“…Furthermore, the CB method often makes a priori assumptions of the An alternative array processing technique is acoustic Time-Reversal (TR) which is a promising source localization method 9 . It finds application in diverse fields such as ultrasonics for medical imaging, diagnostic and non-destructive testing 9 , long-range communication in underwater acoustics 10,11 , in structural dynamics for health monitoring 12 and localizing vibration sources 13 , localizing sound sources in an outdoor urban area with many buildings 14 , in propagation of water waves 15 , source identification in electromagnetics 16 and recently, for detecting gas-leakage in pipelines 17 . The acoustic TR method typically employs the following two-step approach 9 .…”

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confidence: 99%

An experimental application of aeroacoustic time-reversal to the Aeolian tone

Mimani

Prime

Moreau

et al. 2016

The Journal of the Acoustical Society of America

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This paper presents an experimental application of the aeroacoustic Time-Reversal (TR) source localization technique for studying flow-induced noise problems and compares the TR results with those obtained using Conventional Beamforming (CB). Experiments were conducted in an Anechoic Wind Tunnel for the benchmark test-case of a full-span circular cylinder located in subsonic cross-flow wherein the far-field acoustic pressure was sampled using two Line Arrays (LAs) of microphones located above and below the cylinder. The source map obtained using the signals recorded at the two LAs without modeling the reflective surfaces of the contraction-outlet and cylinder during TR simulations revealed the lift-dipole nature of aeroacoustic source generated at the Aeolian tone; however, it indicates an error of th 3 20 of Aeolian tone wavelength in the predicted location. Modeling the reflective contraction-outlet and cylinder during TR was shown to improve the focal-resolution of the source and reduce side-lobe

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mentioning

confidence: 99%

An experimental application of aeroacoustic time-reversal to the Aeolian tone

Mimani

Prime

Moreau

et al. 2016

The Journal of the Acoustical Society of America

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“…is the complex envelop of the channel between the transducer i and the receiver situated at position m. γ (l) mi and θ (l) mi denote respectively the attenuation and delay of the path l between the transducer i and receiver m. Replacing h emi (t) in equation (14) by its expression, we obtain…”

Section: A Formalismmentioning

confidence: 99%

“…Simulation results show that a time reversal acoustic system of 20 emitters 200 m distant from the diver and having peak acoustic power of 100 W is able to disorient and divert the diver away. In [14], the authors applied the time reversal method to localize the vibration sources in a complex structure. Transducers of a time reversal mirror are placed on the structure to record the vibration.…”

Section: Introductionmentioning

confidence: 99%

A Time Reversal-Based Acoustic Indoor Localization System at the Absolute Threshold of Hearing

et al. 2015

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We present in this paper an acoustic indoor location system that allows a simultaneous localization of sources with different location precisions. This is achieved by the use of the time reversal technique and the code-division multiple-access operation. The system was evaluated in terms of accuracy, precision and location delay. Simulations and experiments were carried out while varying the number of sources and that of the precision levels. The effect of the signal-to-noise ratio on system performance was also studied. Results showed that our location system can achieve accuracy of 1.5 cm with 83% precision. Finally, we aimed to reduce the audibility of the location signal. An equalization filter based on the absolute threshold of hearing was applied to the emitted signal and a matched filter was introduced at the receiver. Results showed an improvement in location precision when compared with the location system without the equalization filter. A reduction in signal audibility was noted.Index Terms-time reversal technique, different location precisions, simultaneous localization of sources, code-division multipleaccess technique, absolute threshold of hearing.N. ALOUI is with GIPSA-lab,

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“…[12][13][14][15] An iterative TR technique was also developed to increase the scattered signal strength. 16,17 In solid media, additional linear TR methods have been developed to locate acoustic emissions, 18,19 earthquakes, [20][21][22][23] finger taps, 24,25 and linear scatterers. [26][27][28] The use of TR for the nonlinear detection of cracks was proposed by Guyer 29 and numerically verified by Delsanto et al 30 and Bou Matar et al 31 Sutin et al 6,7 were able to experimentally confirm a reciprocal TR process where a focus is placed at any location specified by a noncontact receiver, allowing an entire region to be studied without transducer rebonding.…”

Section: Introductionmentioning

confidence: 99%

Nonlinearity from stress corrosion cracking as a function of chloride exposure time using the time reversed elastic nonlinearity diagnostic

Young

Anderson

Hogg

et al. 2019

The Journal of the Acoustical Society of America

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The Time Reversed Elastic Nonlinearity Diagnostic (TREND) has a long history of successful nondestructive detection of cracks in solids using nonlinear indicators. Recent research implemented TREND to find stress corrosion cracking (SCC) in the heat-affected zone adjacent to welds in stainless steel. SCC development around welds is likely to occur due to the temperature and chemical exposure of steel canisters housing spent nuclear fuel. The ideal SCC detection technique would quantify the size and extent of the SCC, rather than just locating it, as TREND has been used for in the past. The current paper explores TREND's ability to detect an assumed increase in SCC over time using 13 samples exposed to a magnesium chloride (MgCl2) bath for different lengths of time. The samples are then scanned with TREND and nonlinearity is quantified for each scan point and each sample. The results suggest that TREND can be used to not only locate SCC in the heat-affected zone, but also track an increase in nonlinearity, and thereby an increase in damage, in samples exposed to the MgCl2 solution for a longer duration.

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A simplified Time Reversal method used to localize vibrations sources in a complex structure

Cited by 24 publications

References 9 publications

An experimental application of aeroacoustic time-reversal to the Aeolian tone

An experimental application of aeroacoustic time-reversal to the Aeolian tone

A Time Reversal-Based Acoustic Indoor Localization System at the Absolute Threshold of Hearing

Nonlinearity from stress corrosion cracking as a function of chloride exposure time using the time reversed elastic nonlinearity diagnostic

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