Thickness measurements using broadband Lamb waves
Attenuation Analysis of Lamb Waves Using the Chirplet Transform
... 2.2. Adaptive Algorithm Based on the Chirplet Transform. For ease of visualization, only subspaces of the five-dimensional parameter space of the chirplet transform are considered. In a fashion analogous to the STFT and ...
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Using Lamb Waves to Evaluate Debonding of Steel Plate Strengthened Concrete
... 2. Numerical Simulation An explicit fi nite-element program LS-DYNA is used to simulate the dynamic response of a steel ball impacting on the surface of a plate. Three types of models were constructed in the study ...
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A fault location method using Lamb waves and discrete wavelet transform
... SFEM, measurements were made using two similar aluminum beams of length ...the Lamb wave ...the Lamb wave; an Agilent 33120A arbitrary waveform generator; a homemade power and an instrument ...
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Characterisation of hidden defects using the near field ultrasonic enhancement of Lamb waves
... ultrasonic Lamb waves to detect defects propagating into a ...S0 Lamb waves with the defects are shown to give rise to a characteristic increase in the wave magnitude, which is used to ...
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Analysis of critically refracted longitudinal and Lamb waves for stress characterization
... considered Lamb wave propagation in the direction perpendicular and paral- lel to an applied ...order Lamb modes which were discovered to be more sensitive to stress than either bulk waves or ...
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A Study of Ultrasonic-Lamb-Waves Interaction with a Notch in a Bovine Cortical Tibia using Scanning Laser Vibrometry
... Keywords: Lamb waves, scanning laser vibrometry, ultrasonic bone measurement ...Introduction Lamb waves are propagating energy caused by disturbances on the surface of a material with a ...
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Condition monitoring and testing of piezo elements for the activation of guided Lamb waves & damage identification using ultrasound scanning
... More important in this test, is the coupling between the wedge and the surface. If the coupling is good, the back wall echo of the wedge decreases, while the back wall echo of the plate increases. Focal law Finally the ...
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Generation and detection of nonlinear Lamb waves for the characterization of material nonlinearities. Christian Bermes
... specimen thickness and selected propagation distance for the measurements lead to the problem that the modes have not separated sufficiently in order to be fully detached, such that no distinct “package” ...
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Evaluation of hoop residual stress variations in the thickness of dissimilar welded pipes by using the LCR ultrasonic waves
... thickness of the plates. Therefore depth of any frequencies can be exactly measured. The setup which is shown in Fig. 4 is used here to measure the depth of the L CR wave. Two transducers as sender and receiver ...
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Air-Coupled Lamb and Rayleigh Waves for Remote NDE of Defects and Material Elastic Properties
... by using acoustic mode conversion into plate and surface waves in slanted ...precise measurements of fibre directions and quantification of in-plane anisotropy in composites and natural materials, ...
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Application of a Lamb waves based technique for structural health monitoring of GFRP undercyclic loading
... Acoustic waves were generated by arbitrary waveform generator AWG-4105 with the amplitude of 10 ...with thickness of ...processed using a 10…800 kHz band-pass ...
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Cluster observations and theoretical identification of broadband waves in the auroral region
... ∼14:31:19.05 UT might be of a more nonlinear origin and it is not included in the detailed study. Repeating the procedure leading to Fig. 3, but using only the selected one-second of data results in Fig. 11. The ...
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Ansys Tutorial for Lamb Waves Propagation
... Figure 1 shows the different names that will be used when we refer to different menus or items that will be used during the modeling steps. When there is a Main menu >> submenu >> subsubmenu, it means that ...
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Harmonic Lamb Waves in Heterogeneous Anisotropic Plates
... of Lamb waves propagating in multilayered elastic anisotropic plates are ...analyzing Lamb waves in laminated plates along with the associated numerical problems are ...
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Measurements of seismic wave attenuation using multiple ScS waves
... the measurements of A and E for ScS, sScS, ScS 2 , sScS 2 , ScS 3 , and sScS 3 for our preferred twolayer model of Q: Q UM = 2000 and Q LM = ...
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Understanding broadband speed measurements
... much. Measurements of MIT's speed may be very noisy because our connections are so ...their measurements from parts of the TCP connection, potentially TCP doesn’t have time to ramp up fast enough to fully ...
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Transmission of Lamb waves and resonance at an adhesive butt joint of plates
... of Lamb waves with an adhesive butt joint of aluminum alloy plates has been investigated ...(A0) Lamb modes and the resonance at the joint have been evaluated when subjected to the S0 mode ...the ...
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Sensor requirements for in situ imaging of multiple damage by Lamb waves
... Abstract Lamb waves are guided waves that propagate in plate-like ...These waves are well suited for wide-area inspection, such as aircraft wing skins, because of their relatively slow ...
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In vitro enamel thickness measurements with ultrasound
... enamel thickness, knowledge of the SOS is essential and hence it might be assumed that the SOS uncertainties preclude the use of ultrasound in routine clinical applications of enamel thickness ...enamel ...
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In vitro enamel thickness measurements with ultrasound
... enamel thickness, knowledge of the SOS is essential and hence it might be assumed that the SOS uncertainties preclude the use of ultrasound in routine clinical applications of enamel thickness ...enamel ...
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