Lamb waves
Harmonic Lamb Waves in Heterogeneous Anisotropic Plates
... Since its introduction, the transfer matrix method was applied to finding the dispersion relations for Lamb waves propagating in both isotropic [60-62] and monoclinic (or with higher symmetries) [63, 64] ...
9
Detection of coatings within liquid-filled tubes and containers by mode conversion of leaky Lamb waves
... acoustic waves are excited on piezoelectric substrates by interdigital transducers ...acoustic waves on non-piezoelectric substrates, a single-phase transducer can be utilized (White, 1970; Lindner, ...or ...
12
A Study of Ultrasonic-Lamb-Waves Interaction with a Notch in a Bovine Cortical Tibia using Scanning Laser Vibrometry
... between Lamb waves and a fabricated notch on the bone’s ...of Lamb waves propagating in a notched bone was created prior to the measurement to study the feasibility of Lamb waves ...
10
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 ...
11
Attenuation Analysis of Lamb Waves Using the Chirplet Transform
... Ultrasonic waves are often used in nondestructive testing to evaluate the integrity of structural components, as well as to determine material properties of composite or layered ...guided waves such as ...
6
Condition monitoring and testing of piezo elements for the activation of guided Lamb waves & damage identification using ultrasound scanning
... The design freedom is also one of the main reason for the increased usage of CFRP materials. As result, a lot of CFRP material parts are curved or contain non-linear features. An important aspect in the development of ...
27
Using Lamb Waves to Evaluate Debonding of Steel Plate Strengthened Concrete
... This is a preliminary study on using the dispersive characteristics of the Lamb wave modes traveling within the steel layer to assess the bonding condition. The dispersive curves are obtained by a multichannel ...
5
Imaging Defects in a Plate with Full Non Contact Scanning Laser Source Technique
... To investigate the directivities of the three types of air-coupled transducer for oblique and normal reception, amplitude distributions were obtained for the laser spots arranged in a half circle (Fig. 2). Figure 4 shows ...
6
Evanescent acoustic gravity modes in the isothermal atmosphere: systematization and applications to the Earth and solar atmospheres
... Thus, each evanescent mode can be associated with a pseudo-mode which satisfies the same dispersion relation but differs in polarization and dependence of the amplitude from the height, i.e., in its stratification. Table ...
11
Design and Development of a Contactless Laser-based Automated Nondestructive Evaluation (CLANDE) System for Metallic and Composite Structures.
... guided waves is a very attractive ...Guided waves have been successfully employed to assess damage in composite laminates (Guo & Cawley, The interaction of Lamb waves with delaminations in ...
67
Input Signal Recovering Using Regular Time Reversal And Inverse Filtering
... to Lamb wave propagation is investigated in order to recover the initial input signal in the long distance propagation of dispersive lamb waves ...the lamb wave make it suitable for structural ...
5
Air-Coupled Lamb and Rayleigh Waves for Remote NDE of Defects and Material Elastic Properties
... acoustic waves which propagate through the bulk of material and interact with ...acoustic waves (PAWs, also known as “Lamb waves”) which are found to be highly sensitive to surface-breaking ...
8
Modeling Of Tow Wrinkling In Automated Fiber Placement Based On Geometrical Considerations
... guided Lamb wave propagation and interaction with ...for Lamb wave propagation and interaction with damage is of great importance for both Structural Health Monitoring (SHM) system design and signal ...
103
The use of fibre Bragg gratings for ultrasonic Lamb wave detection and source location
... In our experiments, the Lamb waves have been excited using PZT transducers bonded to the sample. These are driven using an input signal of suitable frequency with a toneburst (typically of 4.5 cycles) with ...
6
Enhancement of Ultrasonic Lamb Wave Transfer to Fiber Bragg Grating Sensors through Remote Bonding.
... Detecting Lamb waves requires the measurement of high frequency minimal strains. The edge filtering method is one of the most commonly used FBG demodulation techniques for this application (Tsuda, 2005; Wu ...
152
On the Directivity of Acoustic Waves Generated by the Angle Beam Wedge Actuator in Thin-Walled Structures
... the waves directivity emitted by the angle beam wedge actuators in thin-walled structures made of plastic materials and polymeric ...the waves that can be excited in the studied plastic ...acoustic ...
16
Ultrasonic Method for Testing Spot Welds
... (ultrasonic Lamb waves) are transmitted to a steel sheet at a ‘‘sending point’’ outside the weld metal of a spot-weld (nugget) and propagate toward the weld metal as a certain propagation mode (mode ...
8
Design and Fabrication of an Industrial Grade Instrument to Measure Texture and Predict Drawability in Sheet Metal
... EMAT technology for So Lamb waves in steel sheet was chosen for building an industrial grade instrument to measure and the Ws automatically.. Appropriate signal processing techniques and[r] ...
8
Excitation and acquisition of cranial guided waves using a concave array transducer
... excite lamb waves in the media plane waves are generated so that they are obliquely incident on the media ExperimentaJJy it was found that an incidence angle of is effective at exciting lamb ...
11
Prediction of lamb eating quality using hyperspectral imaging
... each lamb sample, a region of interest (ROI) with size of 200 × 100 pixels was mainly selected from the lean part and then the median reflectance value at each spectral band was calculated to achieve the median ...
10