Results 291 to 300 of about 32,268 (336)
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Guided wave nuances for ultrasonic nondestructive evaluation
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2000Recent developments in guided wave generation, reception, and mode control show that increased penetration power and sensitivity are possible. A tone burst function generator and appropriate signal processing are generally used. Variable angle beam and comb-type transducers are the key to this effort.
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Ultrasonic guided wave tomography of pipes
2010 International Conference on Audio, Language and Image Processing, 2010Ultrasonic guided wave tomography has been shown to be an effective nondestructive evaluation technique for pipe-like structures. Guided waves propagating in pipe with damage are simulated using the finite element and the first arrival times of the received signals are extracted as input data of tomography.
Zhang Haiyan +3 more
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Ice detection by ultrasonic guided waves
CEAS Aeronautical Journal, 2018This paper describes a method for inflight ice detection using ultrasonic guided waves that is little studied until now. Unlike existing systems, the proposed method can immediately detect icing at the place of formation. The detection area can also include whole structural segments and the proposed sensor can be integrated into a wing structure ...
Mendig, Christian +5 more
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Cure monitoring using ultrasonic guided waves in wires
The Journal of the Acoustical Society of America, 2003The possibility of using ultrasonic guided waves for monitoring the cure process of epoxy resins is investigated. The two techniques presented use a wire waveguide which is partly embedded in the resin. The first technique is based on the measurement of attenuation due to leakage of bulk waves into the resin surrounding the waveguide.
T, Vogt, M, Lowe, P, Cawley
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Mode repulsion of ultrasonic guided waves in rails
Ultrasonics, 2018Accurate computation of dispersion characteristics of guided waves in rails is important during the development of inspection and monitoring systems. Wavenumber versus frequency curves computed by the semi-analytical finite element method exhibit mode repulsion and mode crossing which can be difficult to distinguish.
Philip W, Loveday +2 more
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Guides “bimorphes” d'ondes ultrasoniques “bimorph” ultrasonic wave guides”
International Journal of Engineering Science, 1983Resume L'analyse de la dispersion des ondes elastiques est effectuee dans deux genres de guides ultrasoniques, longs, appeles “bimorphes”: (i) un guide “tri-laminaire” constitue par la superposition de trois couches de deux materiaux differents et (ii) un guide a “noyau rectangulaire gaine” obtenu en enveloppant une tige a section rectangulaire par ...
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Ultrasonic guided wave scattering in a plate overlap
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2005Guided wave scattering in a plate overlap is investigated by numerical calculations and experimental measurements of transmission and reflection factors from the overlap region. In the numerical study, a hybrid boundary element-finite element method is used to calculate the guided wave scattered field from the overlap region.
Won-Joon, Song +3 more
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Ultrasonics Guided Waves for Piping Inspection
1997An ultrasonic guided wave system for pipe inspection is proposed. Using guided wave experience to date on a variety of different tubing problems, feasibility experiments have already been conducted on piping under insulation in both a laboratory and chemical processing facility field environment. Several guided wave techniques are introduced, one using
Rose, Joseph, Jiao, Dale, Spanner, Jack
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COMPUTATIONAL METHODS FOR GUIDED ULTRASONIC WAVES IN PLATES
International Journal of Computational Methods, 2006Reducing the general problem of computing three-dimensional Green's function in a transversely isotropic plate to a finite summation of contributions from a series of planar problems can efficiently yield an accurate solution. Hence, solving the planar scattering problem, of the Pressure-Shear-Vertical (PSV) type or the Shear-Horizontal (SH) type, was
Shah, Arvind, Mahmoud, Abdel-Rahman
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Guided Wave Electromagnetic Ultrasonic Scattering Imaging
2019At present, there are few studies on the defect imaging using guided wave scattering method. Most of the defect detection based on guided wave scattering is limited to the location of the defects, and the defects studied are mostly artificial defects of standard contour shape. The researches on defect imaging utilized transmitted guided waves. However,
Songling Huang +4 more
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