Results 111 to 120 of about 6,744 (161)
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Ultrasonic Lamb wave diffraction tomography
Ultrasonics, 2001Ultrasonic guided waves, Lamb waves, allow large sections of aircraft structures to be rapidly inspected. Unlike conventional ultrasonic C-scan imaging that requires access to the whole inspected area, tomographic algorithms work with data collected over the perimeter.
E V, Malyarenko, M K, Hinders
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Journal of Applied Mathematics and Mechanics, 2009
The author presents results of an analysis of the velocity and the polarization of acoustic Lamb waves propagating in the directions of elastic symmetry of one- and two-layer anisotropic media at small vanishing frequencies (soliton-like waves). The method of fundamental matrices is used for the construction of a solution.
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The author presents results of an analysis of the velocity and the polarization of acoustic Lamb waves propagating in the directions of elastic symmetry of one- and two-layer anisotropic media at small vanishing frequencies (soliton-like waves). The method of fundamental matrices is used for the construction of a solution.
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Scattering of Lamb waves by a circular cylinder
The Journal of the Acoustical Society of America, 2001Following our previous attempt at the scattering from a cylinder in a slab to the incidence of a guided shear wave, we hereby discuss the scattering by an elastic cylinder embedded in an isotropic plate for a variety of bonding states to incidence of the fundamental Lamb wave modes S0 and A0 at the low-frequency regime.
X M, Wang, C F, Ying
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Efficient laser generation of Lamb waves
Optics Letters, 2014We report about the efficient generation of Lamb waves for nondestructive testing (NDT) of carbon fiber reinforced plastics (CFRP) with spatially formed laser beams. Therefore we describe the successful introduction of a liquid crystal on silicon (LCoS)-based spatial light modulator (SLM) to create predetermined spatial laser light distributions for a ...
Philipp, Huke +4 more
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Wideband dispersion reversal of lamb waves
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2014Ultrasonic guided waves have been widely acknowledged as the most promising tools for nondestructive evaluation (NDE). However, because of the multimodal dispersion, the received guided modes usually overlap in both time and frequency, which highly complicates the mode separation and signal interpretation.
Kailiang, Xu +4 more
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Material interface inspection by lamb waves
International Journal of Solids and Structures, 1997zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Kundu, T., Maslov, K.
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Lamb Wave Multitouch Ultrasonic Touchscreen
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2016Touchscreen sensors are widely used in many devices such as smart phones, tablets, and laptops with diverse applications. We present the design, analysis, and implementation of an ultrasonic touchscreen system that utilizes the interaction of transient Lamb waves with objects in contact with the screen. It attempts to improve on the existing ultrasound
Kamyar Firouzi +3 more
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Decoherence of lamb waves by rough interface
IEEE Ultrasonics Symposium, 2005., 2006Propagation of Lamb waves in elastic plate with a periodic grating on one interface has shown an attenuation which can be interpreted as a phenomenon of decoherence. In order to verify this hypothesis, a simplified model is considered, where a fluid plate with a limited periodic grating on one interface is studied by the finite element method (ATILA ...
Bavencoffe, M. +4 more
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Internal Antisymmetric Lamb Waves
Акустический журнал, 2023A class of antisymmetric solutions of Lamb wave equations with zero strains and stresses on the surface, so-called internal Lamb waves, is studied. Two types of such solutions are found: the first corresponds to the Lamé phase velocity; the second, to phase velocities exceeding the velocity of the expansion wave in an unbounded medium.
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Time-frequency representations of Lamb waves
The Journal of the Acoustical Society of America, 2001The objective of this study is to establish the effectiveness of four different time-frequency representations (TFRs)—the reassigned spectrogram, the reassigned scalogram, the smoothed Wigner–Ville distribution, and the Hilbert spectrum—by comparing their ability to resolve the dispersion relationships for Lamb waves generated and detected with optical
M, Niethammer +3 more
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