Journal ArticleDOI
The excitation of Lamb waves in pipes using dry-coupled piezoelectric transducers
D. N. Alleyne,Peter Cawley +1 more
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In this article, the development of a dry-coupled piezoelectric transducer system for the detection of corrosion in chemical plant pipework using cylindrical Lamb waves is described.Abstract:
The development of a dry-coupled piezoelectric transducer system for the detection of corrosion in chemical plant pipework using cylindrical Lamb waves is described. It is shown that the axisymmetricL(0,2) mode at a frequency of about 70 kHz is an attractive mode to use for longdistance propagation. The results show that a ring of piezoelectric length-expander elements can be used to excite theL(0,2) mode and to suppress all the nonaxisymmetric modes. Tests have been carried out both with the piezoelectric elements bonded to the pipe and fabricated into a simple transducer which was clamped against the pipe. The performance of the dry-coupled system was very similar to that of the bonded elements. In pulse echo tests, the noise floor obtained with the dry-coupled system was less than 1% of the amplitude of the propagatingL(0,2) mode. The drycoupled transducers provide a simple, light, readily detachable system for the long-range inspection of pipework.read more
Citations
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Journal ArticleDOI
An FEM Simulation for Guided Elastic Wave Generation and Reflection in Hollow Cylinders With Corrosion Defects
TL;DR: In this article, the generation and reflection of guided elastic waves in hollow cylinders with corrosion defects have been investigated numerically for the purpose of nondestructive evaluation (NDE) of tubular structures.
Journal ArticleDOI
The Sono-Hydro-Gen Process (Ultrasound Induced Hydrogen Production): Challenges and Opportunities
TL;DR: In this paper, the authors make a focus on the application of power ultrasound in hydrogen production and discuss the challenges, opportunities and future directions, and compare the Sono-Hydro-Gen technology with the most commonly used technologies.
Journal ArticleDOI
Acoustic and ultrasonic techniques for defect detection and condition monitoring in water and sewerage pipes: A review
TL;DR: In this article, the authors focus on the application of acoustic and ultrasonic techniques for the detection and assessment of leaks, blockages and defect in buried pipes, and explore the future application of autonomous robotics to deploy these sensors in water distribution and sewerage pipes.
Journal ArticleDOI
The measurement of A0 and S0 Lamb wave attenuation to determine the normal and shear stiffnesses of a compressively loaded interface
TL;DR: It is shown that the increase in attenuation is strongly dependent on the compressive load applied across the solid-solid interface, and the resulting predictions of wave propagation behavior, such as attenuation, obtained are in excellent agreement with those measured experimentally.
Journal ArticleDOI
Feasibility study of sludge and blockage detection inside pipes using guided torsional waves
TL;DR: In this article, a more realistic sludge characteristics, including irregular axial and circumferential profiles of the sludge layer, imperfect bonding state between sludge and the pipe and the material damping of sludge were investigated to identify the critical factors that influence the detection and characterization capability of the two measurements.
References
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Wave Motion in Elastic Solids
TL;DR: In this article, a comprehensive study of elastic wave propagation in solids is presented, ranging from the theory of waves and vibrations in strings to the three-dimensional theory of elastic waves in thick plates.
Journal ArticleDOI
Matrix techniques for modeling ultrasonic waves in multilayered media
TL;DR: This paper presents a review of the main developments of the matrix techniques, and their use in response and modal models, with emphasis on ultrasonics applications.
Journal ArticleDOI
Three‐Dimensional Investigation of the Propagation of Waves in Hollow Circular Cylinders. I. Analytical Foundation
TL;DR: In this paper, the propagation of free harmonic waves along a hollow circular cylinder of infinite extent is discussed within the framework of the linear theory of elasticity, and a characteristic equation appropriate to the circular hollow cylinder is obtained by use of the Helmholtz potentials for arbitrary values of the physical parameters involved.
Journal ArticleDOI
Optimization of Lamb wave inspection techniques
D. N. Alleyne,Peter Cawley +1 more
TL;DR: In this article, the authors discuss the selection of the appropriate mode and frequency range for different inspection requirements and review the possible methods of excitation, response measurement and signal processing, and show that the presence of defects can be detected reliably from changes in the shape of the received waveform.
Journal ArticleDOI
The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves
M.G. Silk,K.F. Bainton +1 more
TL;DR: In this article, it is shown that the L(0, 1) mode, which is comparable to the A0 Lamb wave mode in flat plate, can be generated with acceptable efficiency.
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The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves
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