Simulation of Lamb waves using the spectral cell method

2013 ◽  
Author(s):  
S. Duczek ◽  
M. Joulaian ◽  
A. Düster ◽  
U. Gabbert
Keyword(s):  
Lamb Waves ◽  
Cell Method ◽  
Spectral Cell Method

Finite and spectral cell method for wave propagation in heterogeneous materials

2014 ◽  
Vol 54 (3) ◽  
pp. 661-675 ◽  
Author(s):  
Meysam Joulaian ◽  
Sascha Duczek ◽  
Ulrich Gabbert ◽  
Alexander Düster
Keyword(s):  
Wave Propagation ◽  
Heterogeneous Materials ◽  
Cell Method ◽  
Spectral Cell Method

scholarly journals The spectral cell method in nonlinear earthquake modeling

2017 ◽  
Vol 60 (6) ◽  
pp. 883-903 ◽  
Author(s):  
Daniel Giraldo ◽  
Doriam Restrepo
Keyword(s):  
Cell Method ◽  
Earthquake Modeling ◽  
Spectral Cell Method

Cartesian cut-cell method for axisymmetric separating body flows

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 905-911
Author(s):  
G. Yang ◽  
D. M. Causon ◽  
D. M. Ingram
Keyword(s):  
Cell Method ◽  
Cut Cell ◽  
Cartesian Cut

USE OF LAMB WAVES TO DETECT DAMAGE TO METAL BEAMS

2017 ◽  
Author(s):  
Anorosval Pedro Leirias da Silva Jr ◽  
Paulo Rogério Novak
Keyword(s):  
Lamb Waves

Laser vibrometry of air-coupled Lamb waves

2005 ◽  
Vol 47 (3) ◽  
pp. 123-128 ◽  
Author(s):  
Igor Solodov ◽  
Klaus Pfleiderer ◽  
Gerhard Busse
Keyword(s):  
Lamb Waves ◽  
Laser Vibrometry

Warped-wigner-hough transformation of lamb waves for automatic defect detection

2011 ◽  
Author(s):  
Alessandro Perelli ◽  
Luca De Marchi ◽  
Emanuele Baravelli ◽  
Alessandro Marzani ◽  
Nicolo Speciale
Keyword(s):  
Defect Detection ◽  
Lamb Waves ◽  
Hough Transformation

scholarly journals Frequency-domain study of nonthermal gigahertz phonons reveals Fano coupling to charge carriers

2020 ◽  
Vol 6 (51) ◽  
pp. eabd4540
Author(s):  
Thomas Vasileiadis ◽  
Heng Zhang ◽  
Hai Wang ◽  
Mischa Bonn ◽  
George Fytas ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Acoustic Waves ◽  
Lamb Waves ◽  
Charge Carriers ◽  
Acoustic Phonons ◽  
Phonon Spectra ◽  
Electron Hole Plasma ◽  
Nonequilibrium Conditions ◽  
Microelectronic Components ◽  
Anti Stokes

Telecommunication devices exploit hypersonic gigahertz acoustic phonons to mediate signal processing with microwave radiation, and charge carriers to operate various microelectronic components. Potential interactions of hypersound with charge carriers can be revealed through frequency- and momentum-resolved studies of acoustic phonons in photoexcited semiconductors. Here, we present an all-optical method for excitation and frequency-, momentum-, and space-resolved detection of gigahertz acoustic waves in a spatially confined model semiconductor. Lamb waves are excited in a bare silicon membrane using femtosecond optical pulses and detected with frequency-domain micro-Brillouin light spectroscopy. The population of photoexcited gigahertz phonons displays a hundredfold enhancement as compared with thermal equilibrium. The phonon spectra reveal Stokes–anti-Stokes asymmetry due to propagation, and strongly asymmetric Fano resonances due to coupling between the electron-hole plasma and the photoexcited phonons. This work lays the foundation for studying hypersonic signals in nonequilibrium conditions and, more generally, phonon-dependent phenomena in photoexcited nanostructures.

scholarly journals Non-Invasive Testing of Physical Systems Using Topological Sensitivity

2021 ◽  
Vol 11 (3) ◽  
pp. 1341
Author(s):  
María Higuera ◽  
José M. Perales ◽  
María-Luisa Rapún ◽  
José M. Vega
Keyword(s):  
Lamb Waves ◽  
General Purpose ◽  
Mathematical Tool ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Topological Sensitivity ◽  
Physical Systems ◽  
Non Invasive ◽  
Active Infrared Thermography ◽  
Non Destructive

A review of available results on non-destructive testing of physical systems, using the concept of topological sensitivity, is presented. This mathematical tool estimates the sensitivity of a set of measurements in some given sensors, distributed along the system, to defects/flaws that produce a degradation of the system. Such degradation manifests itself on the properties of the system. The good performance of this general purpose post-processing method is reviewed and illustrated in some applications involving non-destructive testing. These applications include structural health monitoring, considering both elastodynamic ultrasonic guided Lamb waves and active infrared thermography. Related methods can also be used in other fields, such as diagnosis/prognosis of engineering devices, which is also considered.

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