Acoustic source localization in anisotropic plates with "Z" shaped sensor clusters.
TL;DR: A new sensor cluster orientation is proposed to localize an acoustic source in a plate from the time difference of arrival (TDOA) with the help of only four to eight sensors, reducing the number of sensors required for acoustic source localization in an anisotropic plate.
About: This article is published in Ultrasonics.The article was published on 2018-03-01. It has received 44 citations till now. The article focuses on the topics: Acoustic source localization.
Citations
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TL;DR: This study considers different shapes of the wave front generated during an acoustic event and develops a methodology to localize the acoustic source in an anisotropic plate from those wave front shapes.
51 citations
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TL;DR: It was shown that by using the proposed method for TOA extraction, the trained ANN is able to better predict the location of impacts compared to an ANN trained with data from common ToA extraction methods.
46 citations
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TL;DR: In this article, a uniaxial compression test of brick masonry specimens based on acoustic emission (AE) technology was conducted to monitor and assess the dynamic damage and failure mechanisms of masonry structures under load in real time.
28 citations
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TL;DR: A numerical study illustrates how the modified new techniques can localize the acoustic source with sufficient accuracy in an anisotropic plate with unknown orientation of the axes of symmetry and its material properties.
28 citations
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TL;DR: In this article, a square-shaped cluster composed of four densely-spaced sensors forming the four vertices of a square is proposed to improve the estimation accuracy of the incidence angle.
17 citations
References
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TL;DR: In this article, a general method of calculating the location of defects in two dimensions from the arrival times at the sensors is presented. But the ACEMAN system, which uses this method can derive the resolution properties of a sensor array in about 7.5 min.
Abstract: Sensors on the surface of a material under stress can detect acoustic emissions from a defect within the material. The difference in time of detection of an emission from the defect at different sensors gives a way of finding where it is. This paper shows a general method of calculating the location of defects in two dimensions from the arrival times at the sensors. The ACEMAN system, which uses this method can derive the resolution properties of a sensor array in about 7.5 min.
260 citations
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TL;DR: After reviewing various techniques the paper concludes which source localization technique should be most effective for what type of structure and what the current research needs are.
250 citations
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TL;DR: For the first time a technique is proposed to locate the acoustic source in large anisotropic plates with the help of only six sensors without knowing the direction dependent velocity profile in the plate.
207 citations
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TL;DR: An alternative approach based on an optimization scheme is proposed to locate the point of impact in isotropic and anisotropic plates and it is investigated how the prediction would change if the plate is assumed to have some anisotropy.
Abstract: It is shown in this paper that the conventional triangulation technique is not very reliable for locating the impact point even in isotropic plates when the sensors are placed close to the point of strike for two reasons: First, it is difficult to pinpoint the exact time of arrival of the signal and, second, the Lamb modes in a plate are dispersive. Dispersive signals attenuate differently at various frequencies and propagate with different speeds causing distortions in the received signals, and thus introduce error in the time of flight measurement. The triangulation technique assumes that wave speeds in all directions are the same, which is not true for anisotropic plates. Here an alternative approach based on an optimization scheme is proposed to locate the point of impact in isotropic and anisotropic plates. A formulation is presented for the general anisotropic case. Experiments are carried out with an aluminum plate by dropping balls on the plate and picking up acoustic signals at different locations. The impact points predicted by the conventional triangulation technique and the proposed modified method are compared for this isotropic plate. Then it is investigated how the prediction would change if the plate is assumed to have some anisotropy.
127 citations