The measurement of A[sub 0] and S[sub 0] Lamb wave attenuation to determine the normal and shear stiffnesses of a compressively loaded interface

2003 ◽  
Vol 113 (6) ◽  
pp. 3161 ◽  
Author(s):  
Bruce W. Drinkwater ◽  
Michel Castaings ◽  
Bernard Hosten
Keyword(s):  
Lamb Wave ◽  
Wave Attenuation

scholarly journals Integrated Structural Health Assessment Using Piezoelectric Active Sensors

2005 ◽  
Vol 12 (6) ◽  
pp. 389-405 ◽  
Author(s):  
Jeannette R. Wait ◽  
Gyuhae Park ◽  
Charles R. Farrar
Keyword(s):  
Lamb Wave ◽  
Structural Damage ◽  
Structural Integrity ◽  
Damage Identification ◽  
Wave Attenuation ◽  
Health Assessment ◽  
Mechanical Impedance ◽  
Integrated Approach ◽  
Impedance Method ◽  
Sensing Technology

This paper illustrates an integrated approach for identifying structural damage. The method presented utilizes piezoelectric (PZT) materials to actuate/sense the dynamic response of the structures. Two damage identification techniques are integrated in this study, including impedance methods and Lamb wave propagations. The impedance method monitors the variations in structural mechanical impedance, which is coupled with the electrical impedance of the PZT patch. In Lamb wave propagations, one PZT patch acting as an actuator launches an elastic wave through the structure, and responses are measured by an array of PZT sensors. The changes in both wave attenuation and reflection are used to detect and locate the damage. Both the Lamb wave and impedance methods operate in high frequency ranges at which there are measurable changes in structural responses even for incipient damage such as small cracks, debonding, or loose connections. The combination of the local impedance method with the wave propagation based approach allows a better characterization of the system’s structural integrity. The paper concludes with experimental results to demonstrate the feasibility of this integrated active sensing technology.

Lamb wave attenuation in a rough plate. I. Analytical and experimental results in an anisotropic plate

2008 ◽  
Vol 104 (7) ◽  
pp. 074908 ◽  
Author(s):  
Catherine Potel ◽  
Damien Leduc ◽  
Bruno Morvan ◽  
Claude Depollier ◽  
Anne-Christine Hladky-Hennion ◽  
...  
Keyword(s):  
Lamb Wave ◽  
Anisotropic Plate ◽  
Wave Attenuation ◽  
Experimental Results ◽  
Rough Plate

Lamb wave attenuation in a rough plate. II. Analytical and numerical results in a fluid plate

2008 ◽  
Vol 104 (7) ◽  
pp. 074909 ◽  
Author(s):  
Catherine Potel ◽  
Damien Leduc ◽  
Bruno Morvan ◽  
Claude Depollier ◽  
Anne-Christine Hladky-Hennion ◽  
...  
Keyword(s):  
Lamb Wave ◽  
Wave Attenuation ◽  
Numerical Results ◽  
Rough Plate

Characterization of Lamb wave attenuation mechanisms

2013 ◽  
Author(s):  
Daniel Schmidt ◽  
Hossein Sadri ◽  
Artur Szewieczek ◽  
Michael Sinapius ◽  
Peter Wierach ◽  
...  
Keyword(s):  
Lamb Wave ◽  
Wave Attenuation

Lamb Wave Tomography and Its Application in Pipe Erosion/Corrosion Monitoring

1996 ◽  
Vol 8 (1) ◽  
pp. 189-197
Author(s):  
J. Pei ◽  
M. I. Yousuf ◽  
F. L. Degertekin ◽  
B. V. Honein ◽  
B. T. Khuri-Yakub
Keyword(s):  
Lamb Wave ◽  
Corrosion Monitoring ◽  
Erosion Corrosion ◽  
Wave Tomography

THE ANALYSIS OF ULTRASONIC WAVE ATTENUATION SPECTRA IN STEELS

1983 ◽  
Vol 44 (C9) ◽  
pp. C9-337-C9-340 ◽  
Author(s):  
R. L. Smith ◽  
W. N. Reynolds ◽  
S. Perring
Keyword(s):  
Ultrasonic Wave ◽  
Wave Attenuation

Bulk drag coefficient of a subaquatic vegetation subjected to irregular waves: Influence of Reynolds and Keulegan-Carpenter numbers

2020 ◽  
pp. 34-42
Author(s):  
Thibault Chastel ◽  
Kevin Botten ◽  
Nathalie Durand ◽  
Nicole Goutal
Keyword(s):  
Drag Coefficient ◽  
Wave Height ◽  
Wave Attenuation ◽  
Empirical Relationship ◽  
Breaking Waves ◽  
Irregular Waves ◽  
Geometrical Parameters ◽  
Flume Experiments ◽  
Seagrass Meadows ◽  
Artificial Vegetation

Seagrass meadows are essential for protection of coastal erosion by damping wave and stabilizing the seabed. Seagrass are considered as a source of water resistance which modifies strongly the wave dynamics. As a part of EDF R & D seagrass restoration project in the Berre lagoon, we quantify the wave attenuation due to artificial vegetation distributed in a flume. Experiments have been conducted at Saint-Venant Hydraulics Laboratory wave flume (Chatou, France). We measure the wave damping with 13 resistive waves gauges along a distance L = 22.5 m for the “low” density and L = 12.15 m for the “high” density of vegetation mimics. A JONSWAP spectrum is used for the generation of irregular waves with significant wave height Hs ranging from 0.10 to 0.23 m and peak period Tp ranging from 1 to 3 s. Artificial vegetation is a model of Posidonia oceanica seagrass species represented by slightly flexible polypropylene shoots with 8 artificial leaves of 0.28 and 0.16 m height. Different hydrodynamics conditions (Hs, Tp, water depth hw) and geometrical parameters (submergence ratio α, shoot density N) have been tested to see their influence on wave attenuation. For a high submergence ratio (typically 0.7), the wave attenuation can reach 67% of the incident wave height whereas for a low submergence ratio (< 0.2) the wave attenuation is negligible. From each experiment, a bulk drag coefficient has been extracted following the energy dissipation model for irregular non-breaking waves developed by Mendez and Losada (2004). This model, based on the assumption that the energy loss over the species meadow is essentially due to the drag force, takes into account both wave and vegetation parameter. Finally, we found an empirical relationship for Cd depending on 2 dimensionless parameters: the Reynolds and Keulegan-Carpenter numbers. These relationships are compared with other similar studies.

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