Analysis of Distributed Sparse Array Configurations for Guided Wave Imaging Applications

Hall, Julie; Michaels, Jennifer E.

doi:10.1063/1.3591937

Cited by 3 publications

(2 citation statements)

References 12 publications

(19 reference statements)

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“…Croxford [13] recommended a cell of six sensors arranged as a regular hexagon to optimize a practical structure health monitoring (SHM) system. Hall and Michaels [14] explored the sensor number and the pattern of a PZT sensor array on the image performance by a conventional delay-and-sum imaging algorithm. Chen [15] proposed a scattering matrix estimation method to quantify the ability of a PZT sensor array to interrogate a specific directional scatter.…”

Section: Introductionmentioning

confidence: 99%

Influence of the PZT Sensor Array Configuration on Lamb Wave Tomography Imaging with the RAPID Algorithm for Hole and Crack Detection

Wang

Shen

et al. 2020

Sensors

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The tomography technique is an effective way to quantitatively evaluate damage from reconstruction imaging in structure health monitoring (SHM). The reconstruction algorithm for the probabilistic inspection of damage (RAPID) algorithm based on the signal difference coefficient (SDC) feature is a promising approach due to its superior performance. This paper focuses on the influence of different patterns of PZT (Lead Zirconate Titanate) sensor array configurations, i.e., the circular, square, and parallel array, on reconstruction image qualities for evaluating hole and crack damage. Variable shape parameters are applied to account for the unequal damage distances of different actuator-sensor pairs. Considering the directionality scattering fields of cracks, the angular scattering pattern of the SDC values are studied by simulation. The SDC variations for different groups of sensing paths at the same actuator are applied to predict the crack orientation. An improved RAPID algorithm is proposed by defining an additional SDC value of 1 in the path along the predicted crack orientation, which is determined by the point of the actuator causing the minimal SDC variation and the center point of the initial reconstruction image of the crack. The results show that the improved RAPID algorithm is effective for the evaluation of crack damage. Reconstruction image qualities with three PZT sensor array configurations for both holes and cracks are compared. The research is significant for selecting the PZT sensor array configuration in SHM.

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Section: Introductionmentioning

confidence: 99%

Influence of the PZT Sensor Array Configuration on Lamb Wave Tomography Imaging with the RAPID Algorithm for Hole and Crack Detection

Wang

Shen

et al. 2020

Sensors

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“…Thus, they recommended using a cell of 6 transducers arranged as a regular hexagon to optimize a practical SHM system. Hall and Michaels [5] investigated the array configuration by considering its influence on the performance of different guided wave imaging algorithms. They defined a pixel-specific performance ratio between the value of a defect indication and the maximum imaging artifact and used it to compare array configurations with different aperture sizes.…”

Section: Introductionmentioning

confidence: 99%

Design of distributed sparse arrays for Lamb wave SHM based upon estimated scattering matrices

Chen

Michaels

2014

AIP Conference Proceedings

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Model-based imaging of damage with Lamb waves via sparse reconstruction J. Acoust. Soc. Am. 133, 1525 (2013); 10.1121/1.4788984 Estimation of guided wave scattering matrices from spatially distributed transducer arrays AIP Conf. Abstract.A common practice in guided wave structural health monitoring is collecting measurements from a transducer array using the pitch-catch method. Among different array configurations, the spatially distributed array provides a costeffective solution for rapid interrogation of large, plate-like structures. Several guided wave imaging techniques have been proposed and successfully demonstrated for damage detection and localization. However, the performance of these imaging methods can be compromised by a mismatch between a particular transducer array geometry and the scattering characteristics of a defect of interest. This study proposes a method, which is based upon estimating scattering matrices, to quantify the ability of a specific array geometry to interrogate a scatterer. Several array geometries are evaluated using this method, and a Monte Carlo simulation is then performed to vary the transducer locations to find the array geometry that is best matched to a specific directional scatterer. The efficacy of the proposed method is evaluated experimentally by introducing notches of different orientations and locations on an aluminum plate specimen that is instrumented with a spatially distributed array.

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Combined two-level damage identification strategy using ultrasonic guided waves and physical knowledge assisted machine learning

Rautela

Senthilnath²,

Moll

et al. 2021

Ultrasonics

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Analysis of Distributed Sparse Array Configurations for Guided Wave Imaging Applications

Cited by 3 publications

References 12 publications

Influence of the PZT Sensor Array Configuration on Lamb Wave Tomography Imaging with the RAPID Algorithm for Hole and Crack Detection

Influence of the PZT Sensor Array Configuration on Lamb Wave Tomography Imaging with the RAPID Algorithm for Hole and Crack Detection

Design of distributed sparse arrays for Lamb wave SHM based upon estimated scattering matrices

Combined two-level damage identification strategy using ultrasonic guided waves and physical knowledge assisted machine learning

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