Locating the acoustic source in an anisotropic plate

Koabaz, Mahmoud; Hajzargarbashi, Talieh; Kundu, Tribikram; Deschamps, M.

doi:10.1177/1475921711419991

Cited by 50 publications

(23 citation statements)

References 17 publications

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“…Different versions of the acoustic source localization technique in an anisotropic plate with known velocity profile are available in the literature (Kundu et al [2][3][4], Hajzargerbashi et al [5], Koabaz et al [6], Nakatani et al [7]). Most of these techniques require optimization scheme such as simplex algorithm [8] and genetic algorithm [9][10].…”

Section: Introductionmentioning

confidence: 99%

Acoustic source localization in an anisotropic plate without knowing its material properties – A new approach

2017

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A number of techniques are available for acoustic source localization in isotropic plates without knowing the material properties of the plate. However, for a highly anisotropic plate acoustic source localization requires some knowledge of the plate material properties or its group velocity profile. In absence of this information one requires a large number of sensors to predict the acoustic source point in the plate. All proposed techniques for acoustic source localization with a few sensors assume the straight line propagation of waves from the source to the receiving sensor with an average group velocity when the plate material properties are not known. However, this assumption is not true for an anisotropic plate. Although the currently available techniques work well for weakly anisotropic plates since the wave path does not deviate significantly from the straight line propagation they fail miserably for highly anisotropic plates.In this paper acoustic source is localized in an anisotropic plate when non-circular wave front is generated. Direction vectors of wave fronts are obtained from the Time-Difference-Of-Arrivals (TDOA) at three sensors placed in a cluster. Four such direction vectors are then utilized in geometric vector analysis to accurately obtain the acoustic source location. The proposed technique is illustrated on an orthotropic plate that generates rhombus shaped wave front. It should be noted that the proposed technique does not require wave propagation along a straight line from the source to the sensor. It also does not need the knowledge of the material properties of the plate.

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Section: Introductionmentioning

confidence: 99%

Acoustic source localization in an anisotropic plate without knowing its material properties – A new approach

2017

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“…Various versions of the acoustic source localization technique in an anisotropic plate with known velocity profile are available in the literature (Kundu et al [2][3][4], Hajzargerbashi et al [5], Koabaz et al [6], Nakatani et al [7]). The formulation presented below is based on these publications.…”

Section: Applicable Techniques When the Velocity Profile Is Knownmentioning

confidence: 98%

“…All techniques for source localization in anisotropic structures can be classified under two categories -methods that require prior knowledge of the material properties of the structure [2][3][4][5][6][7] and methods that do not require such knowledge [8][9][10][11]. After discussing the limitations of these methods a new two-step method is proposed in this paper by combining the two techniques for efficiently and accurately predicting the acoustic source location in anisotropic structures without knowing their material properties.…”

Section: Introductionmentioning

confidence: 99%

A two-step hybrid technique for accurately localizing acoustic source in anisotropic structures without knowing their material properties

et al. 2015

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“…In this context, numerous approaches for damage detection and location have been proposed in literature [1,2]. One of the most promising damage location techniques is based on the triangulation of acoustic waves (AE) [2,[4][5][6][7]. Basically, a set of piezoelectric transducers is attached on a host structure in order to capture the acoustic waves produced by failures or cracks.…”

Section: Introductionmentioning

confidence: 99%

Structural Damage Location by Low-Cost Piezoelectric Transducer and Advanced Signal Processing Techniques

Castro

Baptista

Alves

et al. 2018

5th International Electronic Conference on Sensors and Applications

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The development of new low-cost transducers and systems has been extensively aimed at in both industry and academia to promote a correct failure diagnosis in aerospace, naval, and civil structures. In this context, structural health monitoring (SHM) engineering is focused on promoting human safety and a reduction in the maintenance costs of these components. Traditionally, SHM aims to detect structural damages at the initial stage, before it reaches a critical level of severity. Numerous approaches for damage identification and location have been proposed in the literature. One of the most common damage location techniques is based on acoustic waves triangulation, which stands out as an effective approach. This method uses a piezoelectric transducer as a sensor to capture acoustic waves emitted by cracks or other damage. Basically, the damage location is defined by calculating the difference in the time of arrival (TOA) of the signals. Although it may be simple, the detection of TOA requires complex statistical and signal processing techniques. Based on this issue, this work proposes the evaluation of a low-cost piezoelectric transducer to determine damage location in metallic structures by comparing two methodologies of TOA identification, the Hinkley criterion and the statistical Akaike criterion. The tests were conducted on an aluminum beam in which two piezoelectric transducers were attached at each end. The damage was simulated by pencil lead break (PLB) test applied at four different points of the specimen and the acoustic signals emitted by the damage were acquired and processed by Hinkley and Akaike criteria. The results indicate that, although both signal processing methodologies were able to determine the damage location, Akaike presented higher precision when compared to Hinkley approach. Moreover, the experimental results indicated that the low-cost piezoelectric sensors have a great potential to be applied in the location of structural failures.

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Locating the acoustic source in an anisotropic plate

Cited by 50 publications

References 17 publications

Acoustic source localization in an anisotropic plate without knowing its material properties – A new approach

Acoustic source localization in an anisotropic plate without knowing its material properties – A new approach

A two-step hybrid technique for accurately localizing acoustic source in anisotropic structures without knowing their material properties

Structural Damage Location by Low-Cost Piezoelectric Transducer and Advanced Signal Processing Techniques

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