Zero group velocity Lamb modes and edge resonance in a semi‐infinite plate.

2010 ◽  
Vol 128 (4) ◽  
pp. 2345-2345
Author(s):  
Maximin Ces ◽  
Dominique Clorennec ◽  
Daniel Royer ◽  
Claire Prada
Keyword(s):  
Group Velocity ◽  
Infinite Plate ◽  
Edge Resonance ◽  
Zero Group

Edge resonance and zero group velocity Lamb modes in a free elastic plate

2011 ◽  
Vol 130 (2) ◽  
pp. 689-694 ◽  
Author(s):  
M. Cès ◽  
D. Clorennec ◽  
D. Royer ◽  
C. Prada
Keyword(s):  
Group Velocity ◽  
Elastic Plate ◽  
Edge Resonance ◽  
Zero Group

An Analysis of Laminated Piezoelectric Infinite Plate for Broadband Biomedical Ultrasound Transducer Design

2007 ◽  
Author(s):  
Daniel H. Cortes ◽  
Sam M. Mukdadi
Keyword(s):  
Boundary Conditions ◽  
Frequency Spectrum ◽  
Infinite Plate ◽  
Ultrasound Transducers ◽  
Contrast Imaging ◽  
Element Analysis ◽  
Frequency Spectra ◽  
Waveguide Modes ◽  
Transducer Design ◽  
Zero Group

This work investigates the use of frequency spectrum analysis of waveguide propagation in multi-layered anisotropic piezoelectric transducers. A semi-analytical finite-element analysis (SAFE) is used to model the transducer as a piezoelectric infinite plate. Dispersion curves, group velocities and displacement frequency spectra can be obtained for any multilayered piezoelectric plate. Stress-free boundary conditions were assumed for all analyses. Results for open and closed circuit boundary conditions were analyzed. Zero-Group-Velocity (ZGV) frequencies of high-order waveguide modes were observed to provide multi-resonant displacement frequency spectrum. Comparison of numerical and experimental results shows a good agreement between peak and off-peak values of the displacement spectrum. Results showed that optimization of layered structure may provide an efficient means for generating multi-thickness (ZGV) waveguide modes, thus increasing the bandwidth of harmonic ultrasound transducers for contrast imaging.

scholarly journals Beam shaping to enhance zero group velocity Lamb mode generation in a composite plate and nondestructive testing application

2017 ◽  
Vol 85 ◽  
pp. 13-19 ◽  
Author(s):  
Frédéric Faëse ◽  
Samuel Raetz ◽  
Nikolay Chigarev ◽  
Charfeddine Mechri ◽  
James Blondeau ◽  
...  
Keyword(s):  
Nondestructive Testing ◽  
Group Velocity ◽  
Composite Plate ◽  
Beam Shaping ◽  
Zero Group ◽  
Mode Generation ◽  
Lamb Mode
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