A study of helical Lamb wave propagation on two hollow cylinders with imperfect contact conditions

Balvantín, A.; Baltazar, Arturo; Kim, Jin‐Yeon

doi:10.1063/1.4789032

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…The helical Lamb wave propagates along the spiral line around the pipeline which can pass through the inspected region in extra angles [29]. The contact longitudinal transducers utilizing piezoelectric effect had been applied to generate helical Lamb wave [30], [31]. The macro fibers composite sensors containing the piezoceramic fibers had been attached to the hollow cylinder with an angle to the axis to control the propagation direction of the ultrasonic signal [32].…”

Section: Introductionmentioning

confidence: 99%

Development of a Helical Lamb Wave Electromagnetic Acoustic Transducer for Pipeline Inspection

Wang

et al. 2020

IEEE Sensors J.

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The electromagnetic ultrasonic testing presents great potential in structural health monitoring due to its non-contact advantage. The electromagnetic acoustic transducers generating torsional and longitudinal guided wave have been extensively studied for pipeline structure. However, the transducer for helical wave and corresponding analysis still have not been adequately investigated. This paper proposes the novel transducer to generate helical Lame wave in pipeline. Based on the Lorentz mechanism, the developed transducer contains the fan-shaped magnetic poles and a two-layer coil. The finite element model is built to simulate the wave generation and propagation from the transducer. The displacement distribution verifies the capacity of generating helical wave. The excitation and reception of helical wave are also carried out in the experiment. The actual frequency of the transducer measured from the frequencysweeping coincides with the designed value. In addition, the defect detection experiment is conducted. The axial and circumferential location can be obtained according to the amplitude and time information. The further comparison and discussion indicate that the prior transducer with meander coil is not appropriate to generate helical wave. The developed transducer can generate wave with diverse incident angle which is superior than the transducer for torsional and longitudinal modes.

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Section: Introductionmentioning

confidence: 99%

Development of a Helical Lamb Wave Electromagnetic Acoustic Transducer for Pipeline Inspection

Wang

et al. 2020

IEEE Sensors J.

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“…Several techniques for guided wave characterization of defects using ultrasonics have been studied, such as single transducers (Ghosh et al 1998), phase array transducers (Wilcox 2003), helicoidally propagation (Balvantin et al 2012); and tomography propagation (Malyarenko and Hinders 2001). Some of these techniques have been shown to be promising for damage detection.…”

Section: Introductionmentioning

confidence: 99%

Damage detection using the signal entropy of an ultrasonic sensor network

Rojas

Baltazar

Loh

2015

Smart Mater. Struct.

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Piezoelectric ultrasonic sensors used to propagate guided waves can potentially be implemented to inspect large areas in engineering structures. However, the inherent dispersion and noise of guided acoustic signals, multiple echoes in the structure, as well as a lack of an approximate or exact model, limit their use as a continuous structural health monitoring system. In this work, the implementation of a network of piezoelectric sensors randomly placed on a plate-like structure to detect and locate artificial damage is studied. A network of macro fiber composite (MFC) sensors working in a pitch-catch configuration was set on an aluminum thin plate 1.9 mm in thickness. Signals were analyzed in the timescale domain using the discrete wavelet transform. The objectives of this work were threefold, namely to first develop a damage index based on the entropy distribution using short time wavelet entropy (STWE) of the ultrasonic waves generated by a sensor network, second to determine the performance of an array of spare macro fiber composite (MFC) sensors to detect artificial damage, and third to implement a time-of-arrival (TOA) algorithm on the gathered signals for damage location of an artificial circular discontinuity. Our preliminary test results show that the proposed methodology provides sufficient information for damage detection, which, once combined with the TOA algorithm, allows localization of the damage.

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Structural health monitoring method based on the entropy of an ultrasonic sensor network for a plate-like structure

Rojas¹,

Baltazar²

2015

AIP Conference Proceedings

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A study of helical Lamb wave propagation on two hollow cylinders with imperfect contact conditions

Cited by 4 publications

References 11 publications

Development of a Helical Lamb Wave Electromagnetic Acoustic Transducer for Pipeline Inspection

Development of a Helical Lamb Wave Electromagnetic Acoustic Transducer for Pipeline Inspection

Damage detection using the signal entropy of an ultrasonic sensor network

Structural health monitoring method based on the entropy of an ultrasonic sensor network for a plate-like structure

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