Results 221 to 230 of about 2,905,814 (268)

Numerical and Experimental Investigation of Nonlinear Lamb Wave Mixing at Low Frequency

, 2020
The nonlinear ultrasonic Lamb wave has attracted great attention recently due to its likelihood for microcrack detection in plate-like structures.
Mohammed Aslam, C. R. Bijudas, P. Nagarajan, Mini Remanan   +3 more
semanticscholar   +1 more source

Generalized Lamb-wave multisensor

IEEE 1988 Ultrasonics Symposium Proceedings., 2003
Integrated-circuit fabrication techniques were used to make a versatile silicon-based sensor that uses elastic wave propagation in a plate that is thin compared with the wavelength. In-plane tension raises the velocity of the lowest antisymmetric flexural wave (474 m/s) above that predicted for a pure Lamb wave (422 m/s).
S.W. Wenzel, B.A. Martin, R.M. White
openaire   +1 more source

An enhanced Lamb wave virtual time reversal technique for damage detection with transducer transfer function compensation

Smart materials and structures (Print), 2019
The Lamb wave time reversal method has widely been investigated as a baseline-free damage detection technique for structural health monitoring. Due to the mode tuning effects from the transducer-wave interactions, even for a pristine wave path, the ...
Junzhen Wang, Yanfeng Shen
semanticscholar   +1 more source

Ultrasonic Lamb wave tomography

Inverse Problems, 2002
The ultrasonic Lamb wave tomography is considered in the frame of the pressing nondestructive evaluation (NDE) technology need. The work focuses on tomographic reconstruction to produce quantitative maps that can be easily interpreted by technicians or fed directly into structural integrity and lifetime prediction codes.
Leonard, Kevin R., Malyarenko, Eugene V., Hinders, Mark K.   +2 more
openaire   +1 more source

Efficient laser generation of Lamb waves

Optics Letters, 2014
We 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, Martin, Schröder, Sandra, Hellmers, Michael, Kalms, Ralf B, Bergmann   +4 more
openaire   +2 more sources

Lamb wave propagation in anisotropic multilayered piezoelectric laminates made of PVDF-θ° with initial stresses

, 2020
In this paper, the influence of an initial stresses on the Lamb waves propagation in an anisotropic multilayered piezoelectric laminates is investigated.
Cherif Othmani, He Zhang
semanticscholar   +1 more source

Time-frequency representations of Lamb waves

The Journal of the Acoustical Society of America, 2001
The 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, L J, Jacobs, J, Qu, J, Jarzynski   +3 more
openaire   +2 more sources

Localization of notches with Lamb waves

The Journal of the Acoustical Society of America, 2003
A time–frequency representation (TFR) is used to analyze the interaction of a multimode and dispersive Lamb wave with a notch, and then serves as the basis for a correlation technique to locate the notch. The experimental procedure uses a laser source and a dual-probe laser interferometer to generate and detect Lamb waves in a notched plate.
Rüdiger, Benz, Marc, Niethammer, Stefan, Hurlebaus, Laurence J, Jacobs   +3 more
openaire   +2 more sources

Wideband dispersion reversal of lamb waves

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2014
Ultrasonic 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, Dean, Ta, Bo, Hu, Pascal, Laugier, Weiqi, Wang   +4 more
openaire   +2 more sources

Estimation of the Lamb wave phase velocity dispersion curves using only two adjacent signals

, 2020
Lamb waves are used in various non-destructive testing (NDT) and structural health monitoring (SHM) applications due to their velocity sensitivity to the properties of the material and their propagation over the entire thickness of the object over a long
L. Draudvilienė, O. Tumšys, L. Mazeika, E. Žukauskas   +3 more
semanticscholar   +1 more source