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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TLDR
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
The reflection of the fundamental torsional mode from cracks and notches in pipes
TL;DR: A quantitative study of the reflection of the T(0,1) mode from defects in pipes in the frequency range 10-300 kHz has been carried out, finite element predictions being validated by experiments on selected cases.
Journal ArticleDOI
Magnetostrictive sensor technology and its applications
H. Kwun,K.A. Bartels +1 more
TL;DR: A description is given of its various scientific and engineering applications, including the study of wave dispersion in structures, global and long-range inspection of steel pipes and tubes, condition monitoring of machinery such as combustion engines, and onboard sensing of crash events for vehicle safety system operations.
Journal ArticleDOI
The Mode Conversion of a Guided Wave by a Part-Circumferential Notch in a Pipe
TL;DR: In this article, a study of the reflection of mode-convertea guided waves from notches in pipes has been carried out, and the results showed excellent agreement between the measurements and the predictions for all three modes.
Journal ArticleDOI
The low-frequency reflection and scattering of the S0 Lamb mode from a circular through-thickness hole in a plate: Finite Element, analytical and experimental studies
TL;DR: A study of the interaction of the S0 Lamb wave with a circular through-thickness hole in a plate is presented, and it is found that the trends of the reflection coefficients for different hole diameters, frequencies and distances from the hole satisfy a simple normalization.
Journal ArticleDOI
Rapid, Long Range Inspection of Chemical Plant Pipework Using Guided Waves
TL;DR: Instrumentation for long range, guided wave inspection of pipework is now commercially available and as discussed by the authors discusses the principles of the method and reviews the results of site experience, which was originally designed to work on pipes that were either un-coated or covered with, for example, epoxy paint.
References
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Book
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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