Relevant bibliographies by topics / Lamb Wave

Academic literature on the topic 'Lamb Wave'

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Published: 4 June 2021
Last updated: 14 March 2023

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Journal articles on the topic "Lamb Wave"

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Goldstein, R. V., and S. V. Kuznetsov. "Long-Wave Asymptotics of Lamb Waves." Mechanics of Solids 52, no. 6 (November 2017): 700–707. http://dx.doi.org/10.3103/s0025654417060097.

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Lee, Seung Seok, and Sang Whoe Dho. "Suppressing Technique of the Antisymmetric Mode by the Superposition of Lamb Waves Generated by Two Laser Beams in a Thin Plate." Key Engineering Materials 321-323 (October 2006): 103–7. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.103.

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We present a suppressing technique of the antisymmetric mode by superposition of Lamb waves generated by two laser beams in a thin plate. Two Lamb waves of the same frequency propagating from the opposite direction simultaneously arrive at the point of measurement and are superposed to compose one Lamb wave. The amplitude of the superposed Lamb wave depends on the distance between two laser beams. The suppressing of antisymmetric Lamb wave mode is accomplished by selecting the distance between two beams which simultaneously satisfies the condition of the anti-node(maximum) for the symmetric mode and the minimum for the antisymmetric mode. By this method, the antisymmetric Lamb wave mode is suppressed to the degree of 1.4% of the amplitude measured at zero distance between two beams.
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Park, Sang-Jin, Hoe-Woong Kim, and Young-Sang Joo. "Leaky Lamb Wave Radiation from a Waveguide Plate with Finite Width." Applied Sciences 10, no. 22 (November 16, 2020): 8104. http://dx.doi.org/10.3390/app10228104.

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In this paper, leaky Lamb wave radiation from a waveguide plate with finite width is investigated to gain a basic understanding of the radiation characteristics of the plate-type waveguide sensor. Although the leaky Lamb wave behavior has already been theoretically revealed, most studies have only dealt with two dimensional radiations of a single leaky Lamb wave mode in an infinitely wide plate, and the effect of the width modes (that are additionally formed by the lateral sides of the plate) on leaky Lamb wave radiation has not been fully addressed. This work aimed to explain the propagation behavior and characteristics of the Lamb waves induced by the existence of the width modes and to reveal their effects on leaky Lamb wave radiation for the performance improvement of the waveguide sensor. To investigate the effect of the width modes in a waveguide plate with finite width, propagation characteristics of the Lamb waves were analyzed by the semi-analytical finite element (SAFE) method. Then, the Lamb wave radiation was computationally modeled on the basis of the analyzed propagation characteristics and was also experimentally measured for comparison. From the modeled and measured results of the leaky radiation beam, it was found that the width modes could affect leaky Lamb wave radiation with the mode superposition and radiation characteristics were significantly changed depending on the wave phase of the superposed modes on the radiation surface.
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Sadler, J., and R. Gr Maev. "Experimental and theoretical basis of Lamb waves and their applications in material sciences." Canadian Journal of Physics 85, no. 7 (July 1, 2007): 707–31. http://dx.doi.org/10.1139/p07-082.

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The subject of Lamb waves contains a vast field of literature comprising many individual topics, with the current focus being the effective creation and use of Lamb waves in the fields of material characterization and nondestructive evaluation (NDE). This review chooses to focus on the more recent literature dealing with Lamb waves, giving introductions to a variety of topics. Because of the large amount of literature dealing with Lamb waves, many of the sections of this paper could themselves be expanded into their own literature review. This review begins with a brief introduction of Lamb waves comparing them to the acoustic bulk wave, and Rayleigh wave, and outlines the physics of a guided wave. It discusses the advantages of using guided waves, and theoretical techniques to model Lamb waves. In addition, the review discusses some of the various methods for the detection and creation of Lamb waves; techniques to detect, identify, and extract the mode from the acoustic signal; the use of Lamb waves in material characterization; flaw detection and flaw measurement; and finally examines the scattering of Lamb waves at plate ends and joints. While much of this work is experimentally based in nature, this review has attempted to also include theoretical work when possible. PACS Nos.: 43.90.+v, 81.70.Cv
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Ma, Shuyi, Guixian Zhang, Hongfeng Hou, and Lidong Wang. "Mutual Interactions of Lamb Waves in Nonlinear Elastic Plates." Metals 12, no. 12 (December 16, 2022): 2175. http://dx.doi.org/10.3390/met12122175.

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The mutual interactions of Lamb waves in nonlinear elastic plates are studied in this article. Many researchers have investigated the interactions of Lamb wave modes at nonlinear higher harmonics. However, little is known about nonlinearity-driven Lamb modulations from two primary modes with different frequencies. In this study, the existence of symmetric or antisymmetric mode due to Lamb wave mutual interactions is firstly theoretically formulated. Then, an approach is proposed to evaluate the intensity of phase velocity matching for selecting primary modes. Finally, the characteristics of the modulated wave generation are investigated and demonstrated. The generation of modulated waves in an aluminum plate and fatigue crack can be detected by mutual interactions of Lamb waves. The main contribution of this work is the proposed mutual interaction theory of Lamb waves in fatigue plates, which can guide fatigue detection in the metal plate.
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Radecki, Rafal, Wieslaw Jerzy Staszewski, and Tadeusz Uhl. "Impact of Changing Temperature on Lamb Wave Propagation for Damage Detection." Key Engineering Materials 588 (October 2013): 140–48. http://dx.doi.org/10.4028/www.scientific.net/kem.588.140.

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Lamb waves are the most widely used guided ultrasonic waves for structural damage detection. One of the major problems associate with Lamb wave propagation is the effect of temperature on wave propagation parameters. It is important that these parameters are more sensitive to damage than to varying temperature. The paper demonstrates how amplitude and arrival time of Lamb waves are affected by temperature. The analysis is performed for the experimental data gathered from Lamb wave propagation in a damaged aluminium plate. A simple clustering algorithm is used to distinguish between "undamaged" and "damaged" conditions in the presence of changing temperature.
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Elgamal, Hamada M., Zai Lin Yang, and Jian Wei Zhang. "Numerical Simulation of Lamb Wave Propagation in Isotropic Materials with Different Plate Thicknesses." Advanced Materials Research 1094 (March 2015): 500–504. http://dx.doi.org/10.4028/www.scientific.net/amr.1094.500.

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Understanding the characteristics of Lamb waves is very important for developing a structural health monitoring system. The propagation characteristics of Lamb waves are described in the form of dispersion curves, which are plots of phase/group velocities versus the product offrequency-thicknessgenerated by solving the Lamb wave equations. This paper presents a numerical modeling of Lamb waves’ amplitude behaviors for isotropic aluminum plate (Al 2024-T3). The numerical simulations were carried out using ANSYS by exciting the Lamb wave at the plate end in the frequency range of 150-200 kHz for different plate thicknesses.
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Yang, Zai Lin, Hamada M. Elgamal, and Yao Wang. "Damage Detection Using Lamb Waves (Review)." Advanced Materials Research 1028 (September 2014): 161–66. http://dx.doi.org/10.4028/www.scientific.net/amr.1028.161.

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Several techniques have been researched for detecting damage in plates. Each of these techniques offers their own unique advantages in detecting certain types of damage with various levels of analytical complexity. Lamb waves are guided waves that exist in thin walled structures. Because this type of wave can travel long distance with little attenuation, they have been studied intensively for structural health monitoring, especially in the past few decades. This paper presents an overview of using the Lamb waves in damage detection including the theory of lamb waves and the lamb-wave-based damage identification.
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Li, Chenggeng, Zhenhua Chen, Weibing Chen, and Chao Lu. "Study on Nonlinear Lamb Wave Test for Invisible Impact Damage on CFRP Laminates." Materials Evaluation 80, no. 3 (March 1, 2022): 43–51. http://dx.doi.org/10.32548/2022.me-04191.

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The impact damage imposed on carbon fiber–reinforced polymer (CFRP) materials used in aircraft fuselage may seriously affect flight safety. An ultrasonic testing method can be used to inspect for damage; however, in some cases of invisible or barely visible impact damage, linear ultrasound may not provide a clear indication of the underlying damage. Accordingly, a nonlinear Lamb wave technique was developed in this study to detect invisible impact damage (IID). First, a nonlinear Lamb wave testing platform was set, as well as damage areas with different impact energies. Second, the anisotropic propagation of Lamb waves was studied to determine the wave mode and the distribution of the transducers, and the linear parameters of the Lamb waves were determined. Last, three types of characteristic parameters of nonlinear Lamb waves were obtained for damage detection. As revealed from the results, the linear ultrasonic parameters of A0 mode Lamb waves can be applied to the detection of macro surface cracks, and the frequency shift, relative nonlinearity coefficient (RNC), and fluctuation coefficient of RNCs are highly sensitive to the detection of IID. Thus, a combination of nonlinear S0 Lamb waves and linear A0 Lamb waves can be used for IID and macro surface crack detection, respectively.
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Leonard, Kevin R., Eugene V. Malyarenko, and Mark K. Hinders. "Ultrasonic Lamb wave tomography." Inverse Problems 18, no. 6 (November 8, 2002): 1795–808. http://dx.doi.org/10.1088/0266-5611/18/6/322.

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Dissertations / Theses on the topic "Lamb Wave"

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Malyarenko, Eugene V. "Lamb wave diffraction tomography." W&M ScholarWorks, 2000. https://scholarworks.wm.edu/etd/1539623991.

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As the worldwide aviation fleet continues to age, methods for accurately predicting the presence of structural flaws, such as hidden corrosion and disbonds, that compromise air worthiness become increasingly necessary. Ultrasonic guided waves, Lamb waves, allow large sections of aircraft structures to be rapidly inspected. However, extracting quantitative information from Lamb wave data has always involved highly trained personnel with a detailed knowledge of mechanical waveguide physics. In addition, human inspection process tends to be highly subjective, slow and prone to errors. The only practical alternative to traditional inspection routine is a software expert system capable of interpreting data with minimum error and maximum speed and reliability. Such a system would use the laws of guided wave propagation and material parameters to help signal processing algorithms automatically extract information from digitized waveforms. This work discusses several practical approaches to building such an expert system.;The next step in the inspection process is data interpretation, and imaging is the most natural way to represent two-dimensional structures. Unlike conventional ultrasonic C-scan imaging that requires access to the whole inspected area, tomographic algorithms work with data collected over the perimeter of the sample. Combined with the ability of Lamb waves to travel over large distances, tomography becomes the method of choice for solving NDE problems. This work explores different tomographic reconstruction techniques to graphically represent the Lamb wave data in quantitative maps that can be easily interpreted by technicians. Because the velocity of Lamb waves depends on the thickness, the traveltimes of the fundamental modes can be converted into a thickness map of the inspected region. Lamb waves cannot penetrate through holes and other strongly scattering defects and the assumption of straight wave paths, essential for many tomographic algorithms, fails. Diffraction tomography is a way to incorporate scattering effects into tomographic algorithms in order to improve image quality and resolution. This work describes the iterative reconstruction procedure developed for the Lamb Wave tomography and allowing for ray bending correction for imaging of moderately scattering objects.
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Shi, Yijun 1970. "Analysis of optimum Lamb wave tuning." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8296.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002.
Includes bibliographical references (p. 243-251).
Guided waves are of enormous interest in the nondestructive evaluation of thin-walled structures and layered media. Due to their dispersive and multi-modal nature, it is desirable to tune the waves by discriminating one mode from the others. The objectives of this thesis are (1) to develop schemes and procedures for Lamb wave tuning, (2) to develop tools for understanding and analyzing the mechanism of various tuning techniques, and (3) to provide suggestions and guidelines for selecting optimum tuning parameters. In order to remedy the inherent problems of traditional tuning techniques using angle wedge and comb transducers (such as the inability to tune the modes with low phase velocities, and the inability to control the propagation direction of tuned waves), a novel dynamic phase tuning concept using phased arrays is proposed. In this approach, the constructive interference of desired modes is achieved by properly adjusting the time delays. As an extension to this concept, the synthetic phase tuning (SPT) scheme is introduced, in which the tuning effect is achieved by constructing virtual waves. The effectiveness of SPT against other techniques is experimentally demonstrated, which shows its feasibility. To understand the mechanism of tuning, an analytical model is developed to study transient waves, based on the Fourier integral transform method. The excitation conditions for both angle wedge and array transducers are taken into account. The surface displacements of individual modes and their temporal and spatial Fourier spectrum are derived and used to study the tuning behavior. The analytical results are compared with the experimental results as well as the numerical results obtained from the finite element simulation studies.
(cont.) In dealing with broadband signals, laser generated Lamb waves are investigated. Both line and circular source loading models are developed to study the behavior in the ablation regime. The predicted waveforms and dispersion curves are in good agreement with the experimental results. Based on the same SPT scheme, virtually-tuned waves are constructed by processing a set of broadband signals. Finally, Lamb waves in a transversely isotropic composite plate are investigated. Although the analysis is limited only to the waves propagating in the principal directions, it could serve as the basis for future work on tuning of Lamb waves in composites. It is concluded from this thesis that the SPT method enjoys advantages over other methods including its low operation cost, ability to tune the. modes of low phase velocities, and capability to control the propagation direction of tuned waves. The analysis of transient waves allows us to examine various tuning scenarios. The investigation of the tuning effectiveness enables us to select optimum modes for the given conditions.
by Yijun Shi.
Ph.D.
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Chen, Liling. "Lamb wave propagation in multilayered pipes." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/290123.

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In this dissertation a characteristic equation has been obtained, in the framework of the linear theory of elasticity, for multilayered pipes; individual layers are made of isotropic elastic solids. A theoretical study of the Lamb wave propagation in multilayered pipes for both axisymmetric and nonaxisymmetric loading is presented. The stress and displacement variations inside the multilayered pipe are theoretically calculated for a number of propagating Lamb modes. The Lamb wave dispersion curves and the curves of frequency versus the ratio of wall thickness to half wave length have been computed for different Lamb modes inside a homogeneous pipe and have been compared with published results. These computations are extended to multilayered pipes.
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Gandhi, Navneet. "Determination of dispersion curves for acoustoelastic lamb wave propagation." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37158.

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The effect of stress on Lamb wave propagation is relevant to both nondestructive evaluation and structural health monitoring because of changes in received signals due to both the associated strain and the acoustoelastic effect. A homogeneous plate that is initially isotropic becomes anisotropic under biaxial stress, and dispersion of propagating waves becomes directionally dependent. The problem is similar to Lamb wave propagation in an anisotropic plate, except the fourth order tensor in the resulting wave equation does not have the same symmetry as that for the unstressed anisotropic plate, and the constitutive equation relating incremental stress to incremental strain is more complicated. Here we review the theory of acoustoelastic and develop theory for acoustoelastic Lamb wave propagation and show how dispersion curves shift anisotropically for an aluminum plate under biaxial tension. We also develop an approximate method using the effective elastic constants (EECs) and show that existing commercial tools to generate dispersion curves can be used under restricted conditions to describe wave propagation in biaxially stressed plates. Predictions of changes in phase velocity as a function of propagation direction using theory and the EEC method are compared to experimental results for a single wave mode.
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Tang, Bruce S. "Lamb wave propagation in laminated composite plates." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/80194.

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Low frequency Lamb waves in composite laminates were investigated theoretically and experimentally. To have a general solution for Lamb wave propagation in multilayered composite laminates is not practical due to a large number of boundary conditions needed to be satisfied at the interlaminar interfaces. Various approximate theories have been proposed to model low frequency Lamb wave propagation in composite laminates. In the present study, an approximate solution was derived from an elementary shear deformation plate theory and was shown to work well in the low frequency, long wavelength region. A simple method, similar in configuration to the acousto-ultrasonic technique, was used to measure Lamb wave phase velocities. Low frequency Lamb waves, usually in the range of 10 kHz to 1 MHz, were generated. Dispersion curves of the lowest symmetric Lamb mode and the lowest antisymmetric Lamb mode were obtained. The experimental data were compared with the results obtained from the approximate solution for the lowest Lamb modes in the low frequency, long wavelength region for a unidirectional laminate, a symmetric cross-ply laminate, a symmetric quasi-isotropic laminate and an aluminum plate. There is good correlation between the data and the results obtained from the approximate solution, which suggests that the lowest Lamb modes are modeled adequately by the present theory in these cases. This experimental procedure of measuring phase velocities can be used to characterize laminated composite plates with and without damage since each material and stacking sequence gives distinct lowest symmetric and antisymmetric curves. Stiffness reduction of composite laminates caused by damage can be related to the change in Lamb wave propagation speed. Damage in the form of transverse cracks in the 90° plies of a [90/90/90/0], graphite/epoxy laminate reduced the phase velocities of the Lamb modes. The lowest antisymmetric mode is sensitive to stiffness reduction in composite plates. Consequently, axial stiffness reduction in [0/45/0/45/0/45], and [0]₁₂ woven graphite/polyimide composite laminates was monitored by the lowest antisymmetric Lamb mode.
Ph. D.
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Prego, Borges Jose Luis. "Lamb: a simulation tool for air-coupled lamb wave based ultrasonic NDE systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2010. http://hdl.handle.net/10803/6376.

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La técnica de las ondas de Lamb acopladas por aire representa un importante avance en el área de los Ensayos No Destructivos (END) de materiales laminares.
Sin embargo la compleja naturaleza de las vibraciones mecánicas encontradas en acústica, hacen que el análisis y el estudio de esta área del conocimiento sea un tema muy complejo. De allí que la posibilidad de contar con una herramienta de simulación de software que permita la evaluación y prueba de diferentes configuraciones de excitación y recepción acústica utilizando la flexibilidad de un modelo de computadora sea de una gran utilidad y ayuda.
El objetivo de la presente tesis es proveer al área de los END con un software de simulación gratuito: The LAMB Matlab® toolbox basado en el modelo del software libre de la GNU.
El software es capaz de simular el comportamiento de sistemas de END basados en ondas de Lamb acopladas por aire en láminas isótropas simples utilizando transductores tipo array.
El programa se basa en un arreglo tipo C-scan de un sistema de END y está compuesto por tres bloques principales: 1) Excitación, 2) Propagación y 3) Recepción.
La verificación individual del funcionamiento de dichos módulos se presenta a lo largo de la tesis mediante una serie de comparaciones entre simulaciones y datos experimentales provenientes de diferentes pruebas. Por otro lado, la validación del programa completo se llevo a cabo por medio de experimentos en láminas de cobre y aluminio; utilizando un sistema real de END por ondas de Lamb acopladas en aire mediante arrays cóncavos.
La influencia negativa en el desempeño general de dicho sistema de END real basado en este tipo de transductores se comprobó efectivamente mediante el simulador desarrollado. Esto se debió fundamentalmente al efecto de directividad de los sensores individuales en los transductores y a la simetría cóncava de los arrays.
Para emular este comportamiento la tesis presenta un modelo geométrico bidimensional simple de un filtro espacial, junto a las simulaciones de un nuevo tipo de array plano propuesto.
El programa desarrollado comprobó así mismo la naturaleza coherente de los campos acústicos emitidos en aire por las láminas sujetas a vibraciones de Lamb. Esto se realizó mediante la implementación de un conformador de haz simple de suma y demora; constituyéndose así la etapa inicial de procesamiento de señal del bloque de recepción del programa.
El objetivo principal del presente trabajo fue contribuir con un modelo operativo de simulación y prueba de nuevos diseños de arrays e implementación de estrategias de procesado de señal útiles en sistemas de END basados en ondas de Lamb acopladas por aire.
Finalmente, si bien el objetivo de la calibración del programa no se pudo conseguir; si se logró efectivamente un notable grado de similitud con un sistema de END real.
Air-coupled ultrasonic Lamb waves represent an important advance in Non- Destructive Testing and Evaluation (NDT & NDE) techniques of plate materials and structures. Examples of these advances are the characterization and quality assessment of laminate materials in manufacturing processes, the location of damaged parts in aircrafts and structure monitoring in the aerospace industry.
However the rich and complex nature of mechanical vibrations encountered in acoustics make the subject of analysis and study of these systems a very complex task. Therefore a simulation tool that permits the evaluation and testing of different configuration scenarios using the flexibility of a computer model is an invaluable aid and advantage.
The objective of this thesis is to provide the field of NDT with free open source software i.e. the LAMB Matlabrtoolbox. The toolbox is capable of simulating the behaviour of Lamb wave based NDE systems for single ideal isotropic laminates using air-coupled ultrasonic arrays. The programme usesa pitch-catch type of a Cscan NDE arrangement and is composed of three integrated sections each individually modelling a feature in the system: 1) Excitation, 2) Propagation, and 3) Reception.
For assessment of the individual modules of the toolbox the thesis presents comparisons between each section simulations and the data obtained from different acoustic experiments. The validation of the complete simulator was carried out by evaluation tests on the copper and aluminium plates by use of a real hardware prototype of a Lamb wave based NDE system with aircoupled concave arrays.
The negative impact on the performance of the real air-coupled NDE systembased on concave arrays was effectively confirmed by the programme. This was produced by the inherent directivity of the individual sensors as well as their concave arrangement. To emulate this behaviour the thesis introduces a simple two-dimensional geometric model for the inclusion of the spatial filtering effect of the sensors plus a group of simulations for a new proposed air-coupled plane array transducer.
The software also verified the spatial coherent nature of the Lamb wave fields emitted by a plate in air. This was demonstrated by the implementation of a delay and sum beamformer to constitute an initial signal processing stage in the reception section.
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Rainisch, Uri. "Detection of Ultrasonic Lamb Waves in Paper Using an Optical MEMS Microphone." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4779.

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Laser ultrasonics has been used to measure the bending stiffness of paper products by measuring the dispersion of ultrasonic plate waves. In laser ultrasonics, ultrasound can be generated by absorption of pulsed laser spot while detection can be carried out by Laser Doppler Interferometry. The research presented in this paper describes a new method to detect ultrasonic plate waves using a recently developed acoustic transducer, more specifically an optical Micro ElectroMechanical System (MEMS) microphone with broadband capability. The MEMS device operates as a non-contact proximity probe placed less than ¼ a millimeter away from the plate. The signals are detected with a capacitive micromachined ultrasonic transducer (cMUT) in which the back electrode of the capacitive transducer on a transparent substrate is shaped as an optical diffraction grating. The displacement of the transducer membrane is determined using an optical interferometer. By applying voltage to deflect the membrane electrostatically, the detection sensitivity is kept at an optimum level. The main purpose of the research presented herein was to test this MEMSs ability to detect ultrasonic waves propagating through paper, to increase the signal-to-noise ratio (SNR), and to calibrate the device in order to quantify the limitations on sensitivity in the context of the detection of ultrasound in paper. Similar tests were conducted for comparison with a modified Mach-Zehnder Interferometer, a more traditional method used for laser ultrasonic detection, and its results are presented in this paper.
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Rimal, Nischal. "Impact Localization Using Lamb Wave and Spiral FSAT." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1388672483.

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Kotte, Timo Oliver. "Application of Image Processing Techniques for Lamb Wave Characterization." Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4787.

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Characterization of dispersion curves in plate-like structures is possible with guided Lamb waves. In this research, experimental development of dispersion curves relies on the spectrogram, which suffers from the Heisenberg Uncertainty Principle. Reassignment is capable of localizing ill--defined dispersion curves. Unfortunately, reassignment also introduces spurious components, which reduce reassignment performance. This research develops an algorithm that provides both localization of dispersion curves and elimination of spurious components. To achieve this, an alternative formulation of reassignment called differential reassignment is modified and superimposed with nonlinear anisotropic diffusion. This study first examines reassignment and diffusion components individually. Three different versions of differential reassignment are considered, two of which are modifications explicitly derived in this research. The combined algorithm is then applied to reassign experimentally measured spectrograms, leading to a significant increase in clarity and notch detection performance.
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McKeon, James Christopher P. "Tomography applied to Lamb wave contact scanning nondestructive evaluation." W&M ScholarWorks, 1998. https://scholarworks.wm.edu/etd/1539623370.

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The aging world-wide aviation fleet requires methods for accurately predicting the presence of structural flaws that compromise airworthiness in aircraft structures. Nondestructive Evaluation (NDE) provides the means to assess these structures quickly, quantitatively, and noninvasively. Ultrasonic guided waves, Lamb waves, are useful for evaluating the plate and shell structures common in aerospace applications. The amplitude and time-of-flight of Lamb waves depend on the material properties and thickness of a medium, and so they can be used to detect any areas of differing thickness or material properties which indicate flaws. By scanning sending and receiving transducers over an aircraft, large sections can be evaluated after a single pass. However, while this technique enables the detection of areas of structural deterioration, it does not allow for the quantification of the extent of that deterioration. Tomographic reconstruction with Lamb waves allows for the accurate reconstruction of the variation of quantities of interest, such as thickness, throughout the investigated region, and it presents the data as a quantitative map. The location, shape, and extent of any flaw region can then be easily extracted from this Tomographic image. Two Lamb wave tomography techniques using Parallel Projection tomography (PPT) and Cross Borehole tomography (CBT), are shown to accurately reconstruct flaws of interest to the aircraft industry. A comparison of the quality of reconstruction and practicality is then made between these two methods, and their limitations are discussed and shown experimentally. Higher order plate theory is used to derive analytical solutions for the scattering of the lowest order symmetric Lamb wave from a circular inclusion, and these solutions are used to explain the scattering effects seen in the Tomographic reconstructions. Finally, the means by which this scattering theory can be used to develop Lamb wave Tomographic algorithms that are more generally applicable in-the-field, is presented.
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Books on the topic "Lamb Wave"

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Lammering, Rolf, Ulrich Gabbert, Michael Sinapius, Thomas Schuster, and Peter Wierach, eds. Lamb-Wave Based Structural Health Monitoring in Polymer Composites. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-49715-0.

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Su, Zhongqing, and Lin Ye. Identification of Damage Using Lamb Waves. London: Springer London, 2009. http://dx.doi.org/10.1007/978-1-84882-784-4.

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Center, NASA Glenn Research, ed. Acousto-ultrasonics to assess material and structural properties. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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Center, NASA Glenn Research, ed. Acousto-ultrasonics to assess material and structural properties. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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Center, NASA Glenn Research, ed. Acousto-ultrasonics to assess material and structural properties. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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Lin, Ye, and SpringerLink (Online service), eds. Identification of Damage Using Lamb Waves: From Fundamentals to Applications. London: Springer London, 2009.

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Wilcox, Anthony John. The condition monitoring of press-working systems using ultrasonic Lamb waves. Birmingham: University ofCentral England in Birmingham, 1994.

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Adriatico Conference (1987 Trieste, Italy). Vacuum in non-relativistic matter-radiation systems: Proceedings of the Adriatico Conference, Trieste, Italy, July 14-17, 1987. Edited by Persico F, Power E. A, and Kungl Svenska vetenskapsakademien. Stockholm, Sweden: Royal Swedish Academy of Sciences, 1988.

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Scandrett, Clyde. The propagation of time harmonic Rayleigh-Lamb waves in a bimaterial plate. Monterey, Calif: Naval Postgraduate School, 1989.

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Rupp, J. O. C. Development of two EMAT sensors for the detection of ultrasonic lamb waves. Manchester: UMIST, 1994.

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Book chapters on the topic "Lamb Wave"

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Vergara-Irigaray, Nuria, Michèle Riesen, Gianluca Piazza, Lawrence F. Bronk, Wouter H. P. Driessen, Julianna K. Edwards, Wadih Arap, et al. "Lamb-Wave Resonators." In Encyclopedia of Nanotechnology, 1192. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100338.

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Hinders, Mark K. "Lamb Wave Scattering from Rivets." In Review of Progress in Quantitative Nondestructive Evaluation, 209–16. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0383-1_26.

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Su, Zhongqing, and Lin Ye. "Processing of Lamb Wave Signals." In Identification of Damage Using Lamb Waves, 143–93. London: Springer London, 2009. http://dx.doi.org/10.1007/978-1-84882-784-4_5.

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McKeon, James C. P., and Mark K. Hinders. "Lamb Wave Contact Scanning Tomography." In Review of Progress in Quantitative Nondestructive Evaluation, 951–58. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4791-4_122.

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Raghavan, Ajay, and Carlos E. S. Cesnik. "Lamb-Wave Based Structural Health Monitoring." In Damage Prognosis, 235–58. Chichester, UK: John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470869097.ch11.

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Chang, Zensheu, Dawei Guo, and Ajit K. Mal. "Lamb Wave Propagation Across a Lap Joint." In Review of Progress in Quantitative Nondestructive Evaluation, 185–92. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0383-1_23.

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Hirao, M., K. Yokota, and H. Fukuoka. "Leaky Lamb Wave Along VCR Magnetic Tapes." In Review of Progress in Quantitative Nondestructive Evaluation, 239–46. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0383-1_30.

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Seale, Michael D., and Barry T. Smith. "Lamb Wave Propagation in Thermally Damaged Composites." In Review of Progress in Quantitative Nondestructive Evaluation, 261–66. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0383-1_33.

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Nagata, Y., J. Huang, J. D. Achenbach, and S. Krishnaswamy. "Lamb Wave Tomography Using Laser-Based Ultrasonics." In Review of Progress in Quantitative Nondestructive Evaluation, 561–68. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1987-4_68.

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Assaad, J., S. Grondel, F. El Youbi, E. Moulin, and C. Delebarre. "Dual signal processing approach for Lamb wave analysis." In Springer Proceedings in Physics, 341–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89105-5_30.

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Conference papers on the topic "Lamb Wave"

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Jung, Y. C., T. Kundu, and M. Ehsani. "Lamb Wave Inspection of Concrete Beams." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0886.

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Abstract The feasibility of detecting defects in concrete beams using Lamb waves is investigated in this paper. The traditional ultrasonic methods for inspecting defects in concrete use the reflection and scattering of longitudinal waves by internal defects. Signal amplitude and time of flight measurements provide information about the internal defects in concrete. However, these methods are time consuming and often fail to detect honeycombs, closed cracks and small defects. In this paper the potential of the Lamb wave technique to detect those defects in large concrete beams is investigated. The Lamb wave technique is found to be reliable for detecting such defects in concrete beams.
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Brown, Jacob, Whitney Reynolds, Derek Doyle, and Andrei Zagrai. "Lamb Wave Propagation Through Off-Axis Media." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5116.

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The use of elastic wave based Structural Health Monitoring has shown its usefulness in both characterizing and diagnosing composite structures. Techniques using elastic wave SHM are being developed to allow for improved efficiency and assurance in all stages of space structure development and deployment. These techniques utilize precise understanding of wave propagation characteristics to extract meaningful information regarding the health and validity of a component, assembly, or structure. However, many of these techniques focus on the diagnostic of traditional, isotropic materials, and questions remain as to the effect of the orthotropic properties of resin matrix composite material on the propagation of elastic waves. As the demands and expectations placed upon composite structures continue to expand in the space community, these questions must be addressed to allow the development of elastic wave based SHM techniques that will enable advancements in areas such as automated build validation and qualification, and in-situ characterization and evaluation of increasingly complex space structures. This study attempts to aid this development by examines the effect of cross ply, off-axis fiber orientation on the propagation characteristics of lamb waves. This is achieved by observing the result of symmetric and anti-symmetric wave propagation across materials in cases containing both off-axis and axially-aligned elements. In both cases the surface plies of the test specimen are axially aligned with the wave propagation direction. Using these results, the relative effect of core ply orientation on lamb wave propagation, and lamb wave sensitivity to bulk properties, or alternatively, the dominance of surface properties on propagation characteristics, can be seen, and this information can be used to aid in future research and application of lamb waves for interrogation of advanced, high-strain composite space structures. It was found that the core orientation caused significant variation in the S0 wave velocity, while yielding little influence on the A0 wave velocity.
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Hinders, Mark K., Eugene V. Malyarenko, and James C. McKeon. "Ultrasonic Lamb wave tomographic scanning." In Nondestructive Evaluation Techniques for Aging Infrastructures & Manufacturing, edited by Ajit K. Mal. SPIE, 1999. http://dx.doi.org/10.1117/12.339896.

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Manceau, Jean-Francois, Margot Billot, Vivien Lacour, and Therese Leblois. "GaAs Lamb wave micro sensor." In 2nd International Electronic Conference on Sensors and Applications. Basel, Switzerland: MDPI, 2015. http://dx.doi.org/10.3390/ecsa-2-c001.

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Leonard, K. R. "Lamb Wave Helical Ultrasonic Tomography." In QUANTITATIVE NONDESTRUCTIVE EVALUATION. AIP, 2004. http://dx.doi.org/10.1063/1.1711621.

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Tian, Zhenhua, and Lingyu Yu. "Lamb Wave Propagation Study Using Frequency-Wavenumber Analysis." In ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8013.

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Lamb waves are dispersive and multi-modal. Various wave modes make the interpretation of Lamb wave signal very difficult. It is desired that different modes can be separated for individual analysis. In the this paper, we present our studies on the multimodal Lamb wave propagation and wave mode extraction using frequency-wavenumber analysis. Wave spectrum in the frequency-wavenumber domain shows clear distinction among Lamb wave modes being present. This allows separating them or extracting a desired Lamb wave mode through a novel filtering strategy. Thus a single mode Lamb can be identified and extracted for certain types of damage detection in structural health monitoring (SHM). These concepts are illustrated through experimental testing. A scanning laser Doppler vibrometer is used to acquiring the time-space wavefield regarding the multimodal Lamb wave propagation. Then the recorded wavefield was analyzed in frequency-wavenumber domain and decomposed into different wave modes.
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Meltaus, Johanna, Markku Ylilammi, James Dekker, Tommi Riekkinen, Pekka Rantakari, Arto Nurmela, Tuomas Pensala, Brandon P. Harrington, and Eric Lautenschlager. "Lamb-wave resonator for microphone application." In 2014 IEEE International Ultrasonics Symposium (IUS). IEEE, 2014. http://dx.doi.org/10.1109/ultsym.2014.0096.

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Yiwei Mao, Yongan Shui, Yin Ni, Mingxi Den, Youzhi Li, and Changming Gan. "Pure, low loss Lamb wave transducer." In Proceedings of IEEE Ultrasonics Symposium ULTSYM-94. IEEE, 1994. http://dx.doi.org/10.1109/ultsym.1994.401741.

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Schmidt, Daniel, Hossein Sadri, Artur Szewieczek, Michael Sinapius, Peter Wierach, Ingo Siegert, and Andreas Wendemuth. "Characterization of Lamb wave attenuation mechanisms." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Tribikram Kundu. SPIE, 2013. http://dx.doi.org/10.1117/12.2009594.

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Kotte, Oliver. "Differential Reassignment for Lamb Wave Characterization." In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION. AIP, 2005. http://dx.doi.org/10.1063/1.1916668.

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Reports on the topic "Lamb Wave"

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Shi, Fan, Jennifer E. Michaels, and Sang J. Lee. In Situ Estimation of Applied Biaxial Loads with Lamb Waves (Preprint). Fort Belvoir, VA: Defense Technical Information Center, July 2012. http://dx.doi.org/10.21236/ada564281.

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Carter, R. H. In-Process Detection of Weld Defects Using Laser-Based Ultrasonic Lamb Waves. Office of Scientific and Technical Information (OSTI), January 2001. http://dx.doi.org/10.2172/772901.

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Kercel, S. W. In-Process Detection of Weld Defects Using Laser-Based Ultrasonic Lamb Waves. Office of Scientific and Technical Information (OSTI), January 2001. http://dx.doi.org/10.2172/814054.

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Scandrett, Clyde, and Naresh Vasudevan. The Propagation of Time Harmonic Rayleigh - Lamb Waves in a Bimaterial Plate. Fort Belvoir, VA: Defense Technical Information Center, November 1989. http://dx.doi.org/10.21236/ada216834.

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Simpson, W. A., and D. J. McGuire. Phase and group velocities for Lamb waves in DOP-26 iridium alloy sheet. Office of Scientific and Technical Information (OSTI), July 1994. http://dx.doi.org/10.2172/10171446.

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Paffenholz, Joseph, Jon W. Fox, Xiaobai Gu, Greg S. Jewett, and Subhendu K. Datta. Experimental and Theoretical Study of Rayleigh-Lamb Waves in a Plate Containing a Surface-Breaking Crack. Fort Belvoir, VA: Defense Technical Information Center, January 1990. http://dx.doi.org/10.21236/ada225135.

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Gaunaurd, Guillermo C., and Michael F. Werby. Theoretical Analogies between (Generalized) Lamb and Rayleigh Waves on Insonified, Submerged, Elastic, Hollow and Solid Curved Bodies. Fort Belvoir, VA: Defense Technical Information Center, December 1990. http://dx.doi.org/10.21236/ada237977.

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Chao, Yuh. Fundamental Studies in Embedded Ultrasonic NDE: Lamb Waves Interaction Between Piezoelectric Wafer Active Sensors and Host Structure. Fort Belvoir, VA: Defense Technical Information Center, June 2007. http://dx.doi.org/10.21236/ada472810.

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Nelson, Matthew, Nicolas Duboc, Mina Deshler, Patrick Conry, Adrianna Ortega, Rodman Linn, Trey Gloeckler, Hussnain Shah, and Suhas Pol. Isolated Building Wake Experiment At Texas Tech University’s Wind Engineering Research Field Lab. Office of Scientific and Technical Information (OSTI), January 2022. http://dx.doi.org/10.2172/1839349.

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THE CRACK DETECTION METHOD OF LONGITUDINAL RIB BUTT WELD OF STEEL BRIDGE BASED ON ULTRASONIC LAMB WAVE. The Hong Kong Institute of Steel Construction, August 2022. http://dx.doi.org/10.18057/icass2020.p.265.

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Ultrasonic Lamb wave is an efficient and fast new nondestructive testing technology. Due to its characteristics of wide detection range, high efficiency and strong defect identification ability, ultrasonic Lamb wave has developed rapidly in the field of nondestructive testing in recent years. Meanwhile, the longitudinal rib butt weld is one of the most important failure modes of steel bridge deck, which seriously endangers the safety and durability of long-span steel bridges. In this paper, the fatigue failure mode of longitudinal rib butt weld is considered, the propagation process of ultrasonic guided wave in longitudinal rib butt weld is studied by using finite element real-time simulation, and the influences of different weld and crack parameters on ultrasonic guided wave is analyzed. The results show that the method based on ultrasonic Lamb wave has good applicability to crack detection of longitudinal rib butt weld of steel bridge deck. And this method provides a new idea and method for steel structure damage detection and monitoring.
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