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
Numerical simulation of lamb wave propogation in isotropic layer
Анна Авершьева,Сергей Кузнецов +1 more
TL;DR: In this article, the propagation of Lamb waves in an elastic isotropic layer is studied by analytical and numerical methods and the influence of numerical simulation parameters on the solution stability is analyzed.
Book ChapterDOI
Characterisation of the Vibration of an Ultrasonic Transducer for Guided Waves Applications
TL;DR: In this article, a natural frequency analysis of a typical piezoelectric transducer has been performed to identify the shape of vibration in the frequency range indicated, and an experimental analysis of the vibration of the piezer element through a scanning laser Doppler Vibrometer has been conducted.
Dissertation
Advanced signal processing techniques for multimodal ultrasonic guided wave response
TL;DR: Fateri et al. as mentioned in this paper developed a technique for the measurement of time of arrival (ToA) and group velocity dispersion curves of wave modes for one dimensional structures as far as wave propagation is concerned.
Proceedings ArticleDOI
Using Neural Networks as Pipeline Defect Classifiers
TL;DR: The proposed techniques implemented on a lab scale experimental rig and tested using real-time signal showed the Neural Network was able to classify the different signal of different level of defects.
Journal ArticleDOI
Frequency Dependence of the Defect Sensitivity of Guided Wave Testing for Efficient Defect Detection at Pipe Elbows
TL;DR: Guided wave testing offers an efficient screening method for thinning of pipe walls because of its long inspection range and its ability to inspect pipes with limited access as mentioned in this paper, however, the existence of an elbow in pipes makes the interpretation of echo signals difficult.
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
M.G. Silk,K.F. Bainton +1 more