Journal ArticleDOI
The excitation of Lamb waves in pipes using dry-coupled piezoelectric transducers
D. N. Alleyne,Peter Cawley +1 more
Reads0
Chats0
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
More filters
Journal ArticleDOI
An unsupervised learning algorithm for fatigue crack detection in waveguides
TL;DR: In this paper, an outlier analysis is used to detect fatigue cracks in structural waveguides, which can benefit from built-in transduction, moderately large inspection ranges, and high sensitivity to small flaws.
Journal ArticleDOI
Shear horizontal wave transducers for structural health monitoring and nondestructive testing: A review.
Hongchen Miao,Faxin Li +1 more
TL;DR: In this paper, a review of the state-of-the-art SH wave transducers for structural health monitoring (SHM) and nondestructive testing (NDT) is presented.
Journal ArticleDOI
Scattering of the fundamental torsional mode at an axial crack in a pipe.
TL;DR: Time-domain reflection coefficient analysis demonstrates that the trend of the reflection strength for different crack lengths, pipe diameters, and frequencies from a through-thickness crack satisfies a simple normalization.
Journal ArticleDOI
Reference-free damage detection by means of wavelet transform and empirical mode decomposition applied to Lamb waves
TL;DR: Guided ultrasonic waves are increasingly used in all those structural health monitoring applications that benefit from built-in transduction, moderately large inspection ranges, and high sensitivit... as mentioned in this paper.
Journal ArticleDOI
Guided waves for damage identification in pipeline structures: A review
TL;DR: Guided waves find their niche in cost-effective damage identification in comparison with conventional nondestructive evaluation as well as future challenge in this field is summarized at the end of this review.
References
More filters
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.
Related Papers (5)
The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves
M.G. Silk,K.F. Bainton +1 more