Suppression of Lamb wave excitation via aperture control of a transducer array for ultrasonic clamp-on flow metering

2020 ◽  
Vol 147 (4) ◽  
pp. 2670-2681
Author(s):  
Jack Massaad ◽  
Paul L. M. J. van Neer ◽  
Douwe M. van Willigen ◽  
Michiel A. P. Pertijs ◽  
Nicolaas de Jong ◽  
...  
Keyword(s):  
Lamb Wave ◽  
Wave Excitation ◽  
Transducer Array ◽  
Flow Metering ◽  
Aperture Control

Ультразвуковой контроль сварного шва тонкостенной титановой оболочки с индикатором непровара

2021 ◽  
pp. 24-32
Author(s):  
Р.Р. Исхужин ◽  
В.Н. Борисов ◽  
В.Г. Атавин ◽  
А.А. Узких ◽  
К.К. Хафизова
Keyword(s):  
Lamb Wave ◽  
Digital Filters ◽  
Ultrasonic Inspection ◽  
Study Data ◽  
Ultrasonic Waves ◽  
Incomplete Fusion ◽  
Thin Wall ◽  
Wave Excitation ◽  
Great Efficiency ◽  
Metallographic Study

The work considers the methodology of weld ultrasonic inspection of thin-wall (0.6 mm) titanium alloy shells. The paper also presents a review of publications on Lamb wave excitation and propagation, and on applications of ultrasonic inspection of thin-wall weldments. The problem of adhesion detection was successfully solved (weld zones with incomplete fusion conduct ultrasonic waves well, but do not provide mechanical strength). Angular groove is proposed as an indication of incomplete fusion in the weld. We analyzed different propagation modes of Lamb wave in the material and selected optimum inspection parameters. Wavelet analysis and precise digital filters with small increment provided great efficiency. Inspection results of corrupted weld and defect-free regions were analyzed. The results of ultrasonic scanning were compared to metallographic study data.

Influence of a delamination on Lamb wave excitation by a nearby piezoelectric transducer

2020 ◽  
pp. 1045389X2091997 ◽  
Author(s):  
Alisa N Shpak ◽  
Mikhail V Golub ◽  
Inka Mueller ◽  
Artem Eremin ◽  
Jens Kathol ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Piezoelectric Transducer ◽  
Lamb Wave ◽  
Lamb Waves ◽  
Boundary Integral ◽  
Experimental Investigations ◽  
Wave Excitation ◽  
Damage Scenarios ◽  
Active Sensor ◽  
Piezoelectric Wafer

This article presents the results of theoretical and experimental investigations of characteristic changes of Lamb wave excitation and scattering by a strip-like horizontal delamination in a layered elastic waveguide for Lamb waves induced by a piezoelectric wafer active sensor. The boundary integral equation method is used to describe wave propagation in an infinite layered waveguide with a delamination, while the frequency domain spectral element method is employed to model the dynamic behaviour of the piezoelectric wafer active sensor, which allows to simulate debonding between the piezoelectric wafer active sensor and the waveguide. Experimental investigations of the dynamic interaction of the piezoelectric wafer active sensor with a layered plate containing a horizontal delamination is conducted for several damage scenarios, showing a good agreement with the results obtained using the developed mathematical model. The obtained mathematical model is employed to analyse alteration of the piezo-induced Lamb waves including modes’ decomposition due to delamination. The conversion and/or conservation of the Lamb waves on account of a delamination is investigated. The electro-mechanical impedance of the piezoelectric transducer and the stress intensity factors of a delamination are analysed in dependence on the delamination location.

Lamb wave excitation and propagation in elastic plates with surface obstacles: proper choice of central frequencies

2010 ◽  
Vol 20 (1) ◽  
pp. 015020 ◽  
Author(s):  
Evgeny Glushkov ◽  
Natalia Glushkova ◽  
Rolf Lammering ◽  
Artem Eremin ◽  
Mirko N Neumann
Keyword(s):  
Lamb Wave ◽  
Proper Choice ◽  
Elastic Plates ◽  
Wave Excitation

Analysis and optimization of wedge transducers for Lamb wave excitation.

1996 ◽  
Vol 99 (4) ◽  
pp. 2467-2500
Author(s):  
F. Levent Degertekin ◽  
Butrus T. Khuri‐Yakub
Keyword(s):  
Lamb Wave ◽  
Wave Excitation

Lamb wave excitation with piezoelectric wafers – an analytical approach

2007 ◽  
Vol 193 (3-4) ◽  
pp. 141-150 ◽  
Author(s):  
S. von Ende ◽  
I. Schäfer ◽  
R. Lammering
Keyword(s):  
Lamb Wave ◽  
Analytical Approach ◽  
Wave Excitation ◽  
Piezoelectric Wafers

Characterization of mode selective actuator and sensor systems for Lamb wave excitation

2012 ◽  
Author(s):  
Daniel Schmidt ◽  
Christoph Heinze ◽  
Wolfgang Hillger ◽  
Artur Szewieczek ◽  
Michael Sinapius ◽  
...  
Keyword(s):  
Lamb Wave ◽  
Sensor Systems ◽  
Wave Excitation
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