Biologically inspired structural diagnostics through beamforming with phased transducer arrays

Sundararaman, Shankar; Adams, Douglas E.; Rigas, Elias J.

doi:10.1016/j.ijengsci.2004.12.008

Cited by 21 publications

(16 citation statements)

References 17 publications

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“…The transducer configuration described in [8] was also investigated and it was indicated that the star-shape array consists of L-shape arrays and these two transducer configurations should not be treated independently.…”

Section: Discussionmentioning

confidence: 99%

“…This comparison could be continued with investigation of other damage scenarios but rather than doing it, it should be pointed out that the L-shape array introduced in [8] is nothing more than a part of the star-shape array introduced in this work (Figure 3). The whole star-shape array consists of four L-shape arrays (two oriented along the x-and y-axes and two rotated by 458).…”

Section: Comparsionmentioning

confidence: 99%

“…It allows to amplify the signal to such an extent that reflection from damage may be easily identified. The concept has been used [4][5][6][7][8][9][10][11]14,15] with promising results. In this article, the idea is modified so that it removes ambiguity in damage localization.…”

mentioning

confidence: 99%

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A Phased Array-based Method for Damage Detection and Localization in Thin Plates

Malinowski

Wandowski

Trendafilova³

et al. 2008

Structural Health Monitoring

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A method for damage localization based on the phased array idea has been developed. Four arrays of transducers are used to perform a beam-forming procedure. Each array consists of nine transducers placed along a line, which are able to excite and register elastic waves. The A 0 Lamb wave mode has been chosen for the localization method. The arrays are placed in such a way that the angular difference between them is 458 and the rotation point is the middle transducer, which is common for all the arrays. The idea has been tested on a square aluminium plate modeled by the Spectral Element Method. Two types of damage were considered, namely distributed damage, which was modeled as stiffness reduction, and cracks, modeled as separation of nodes between selected spectral elements. The plate is excited by a wave packet. The whole array system is placed in the middle of the plate. Each linear phased array in the system acts independently and produces maps of a scanned field based on the beam-forming procedure. These maps are made of time signals (transferred to space domain) that represent the difference between the damaged plate signals and those from the intact plate. An algorithm was developed to join all four maps. The final map is modified by proposed signal processing algorithm to indicate the damaged area of the plate more precisely. The problem for damage localization was investigated and exemplary maps confirming the effectiveness of the proposed system were obtained. It was also shown that the response of the introduced configuration removes the ambiguity of damage localization normally present when a linear phased array is utilized. The investigation is based exclusively on numerical data.

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Section: Discussionmentioning

confidence: 99%

Section: Comparsionmentioning

confidence: 99%

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A Phased Array-based Method for Damage Detection and Localization in Thin Plates

Malinowski

Wandowski

Trendafilova³

et al. 2008

Structural Health Monitoring

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“…The associated broadband dispersive character of this waveform along with associated corrections for the cylindrical nature of the specimen and the material anisotropy were incorporated into the analysis. The work described herein represents an extension to the model and experiments described previously in [18,19]. In this prior work, phased array beamformers consisting of sensor/actuator arrays were used to locate damage in steel and composite plates.…”

Section: Vibration-basedmentioning

confidence: 99%

“…A series of ten low sensitivity, high frequency accelerometers (PCB U352C22) spaced 11 mm apart were positioned in a T-array at one end of the cylinder (opposite the actuator) and the corresponding signals were measured using the Tektronix TDS5054B-NV-T digital oscilloscope. In a previous paper [19], it was determined that more than 3 sensors and preferably 10 sensors are needed to ensure adequate resolution for beamforming method. Additional characteristics for optimizing the results obtained from a linear phased array are provided in [24].…”

Section: Beamforming Analysismentioning

confidence: 99%

Identification of Impact Damage in S-2 Glass Composite Missile Casings Using Complementary Vibration and Wave Propagation Approaches

et al. 2007

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The future United States military arsenal is transitioning from homogeneous metallic materials to stronger and lighter heterogeneous composite materials. Although these composites offer numerous advantages such as the ability to tune strength to weight ratios for each particular application, composites are susceptible to numerous damage mechanisms and environmental factors. Accidental in-field impacts resulting from mishandling or transportation loads have been identified by the U.S. Army as the primary cause of damage in composite weapon systems. This paper presents a hybrid approach to detect, locate, and quantify damage in filament wound canisters using a complementary set of vibration-based (transmissibility and embedded sensitivity) and wave propagation-based (phased array beamforming) methods. It is shown that this hybrid approach accurately detects, locates, and quantifies the damage imposed by 1.36 and 6.78 N-m impact energies. By measuring the static stiffness of the baseline canister at the mid-point, it was determined that the 1.36 N-m impact resulted in an overall 6% reduction of the tubes bending stiffness, while the 6.78 N-m impact resulted in a 28% reduction.

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Detection, Localisation and Identification of Damage by ElasticWave Propagation

Ostachowicz

Kudela

Krawczuk

et al. 2012

Guided Waves in Structures for SHM

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Biologically inspired structural diagnostics through beamforming with phased transducer arrays

Cited by 21 publications

References 17 publications

A Phased Array-based Method for Damage Detection and Localization in Thin Plates

A Phased Array-based Method for Damage Detection and Localization in Thin Plates

Identification of Impact Damage in S-2 Glass Composite Missile Casings Using Complementary Vibration and Wave Propagation Approaches

Detection, Localisation and Identification of Damage by ElasticWave Propagation

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