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2 edition of Electromagnetic acoustic transducer analysis by the finite element method. found in the catalog.

Electromagnetic acoustic transducer analysis by the finite element method.

Reza Jafari Shapoorabadi

Electromagnetic acoustic transducer analysis by the finite element method.

  • 198 Want to read
  • 26 Currently reading

Published .
Written in English


Edition Notes

Thesis (Ph.D.) -- University of Toronto, 2002.

The Physical Object
Pagination148 leaves.
Number of Pages148
ID Numbers
Open LibraryOL20576523M
ISBN 100612945472

Thus, this paper investigates a transducer design method to generate a pure SH1 guided-wave, where the dual periodic-permanent-magnet electromagnetic acoustic transducers (PPM EMATs) are placed on exactly opposite positions either side of the plate symmetrically. Therefore, compared with conventional methods requiring long time, guided waves are ideal for non-destructive testing of wireropes. In this research, aiming to evaluate effects of the geometry of wireropes on guided wave propagation and to generate particular oscillation modes, we carried out experiments and finite element analysis.


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Electromagnetic acoustic transducer analysis by the finite element method. by Reza Jafari Shapoorabadi Download PDF EPUB FB2

Buy Electromagnetic Acoustic Transducer Analysis: The efficiency of EMATs is inherently low and methods for increasing it have been the subject of intense research. In publications, the finite element (FE) technique has been applied to the diffusion equation in order to model EMATs.

However, electromagnetic theory indicates that the Price: $ Finite Element model of SH wave magnetostrictive EMAT con gura-tion. The transducer is made of a current-carrying wire producing a dynamic magnetic eld and permanent magnets (not shown) to pro-vide a bias eld. The disk is divided into a magnetostrictive region, where transduction occurs, an elastic region where SH waves propa.

The paper contains an original comprehensive review of finite element analysis (FEA) applied by researchers to calibrate and improve existing and developing electromagnetic non-destructive testing and evaluation techniques, including but not limited to magnetic flux leakage (MFL), eddy current testing, electromagnetic-acoustic transducers (EMATs).

Premium is put on the Cited by:   A hybrid finite element model for simulation of electromagnetic acoustic transducer (EMAT) based plate waves.

(SPWVD) is a time–frequency (t–f) analysis method, which calculates the simultaneous time–frequency response of the measured signals. It shows how the frequency content changes as a function of by: Previously, we developed a method based on FEM and FDTD for the study of an Electromagnetic Acoustic Transducer Array (EMAT).

is paper presents a new analytical solution to the eddy current problem for the meander coil used in an EMAT, which Finite element method (FEM) F: e magnitude distribution of the vector potential based on di erent.

The paper contains an original comprehensive review of finite element analysis (FEA) applied by researchers to calibrate and improve existing and developing electromagnetic non-destructive testing.

review of finite element analysis (FEA) applied by researchers to calibrate and improve existing and develop-ing electromagnetic non-destructive testing and evaluation techniques, including but not limited to magnetic flux leak-age (MFL), eddy current testing, electromagnetic-acoustic transducers (EMATs).

Premium is put on the detection and. This paper presents two three-dimensional finite element models for signal detection electromagnetic ultrasonic transducer, and the analysis based on three-dimensional finite element simulation on sensitivity of models with different coil shapes has been performed, and the matching problem between permanent magnet and coil size is also considered.

Abstract: An elementary tutorial introduction in finite-element numerical analysis is presented. The finite-element method is applied to Laplacian electrostatic field problems.

Suggestions are offered on how the basic concepts developed can be extended to finite-element analysis of problems involving Poisson's or the wave equation. Electromagnetic acoustic transducers (EMATs) are non-contact, non-destructive testing devices for conducting specimens.

The efficiency of EMATs is inherently low and methods for increasing it have been the subject of intense research. In publications, the finite element (FE) technique has been applied to the diffusion equation in order to Author: Reza Jafari.

Transducer design simulation using finite element method Wenwu Cao The fundamental equations for the structural analysis of transducers are the equations of motion in solids and acoustic velocity is much slower than that of the electromagnetic waves.

In finite element computations, the continuous medium is meshed into a set of discrete. In this paper a comprehensive finite element analysis of Electromagnetic Acoustic Transducer (EMAT) is presented. EMAT is an emerging technology that provides a non contact process of testing materials compared to Ultrasonic Testing (UT) technique that requires a coupling medium.

The EMAT phenomenon can be particularly useful in rail. In this paper a comprehensive finite element analysis of Electromagnetic Acoustic Transducer (EMAT) is presented. The analysis has been performed using complete and incomplete expressions for excitation current and results have been compared with published data to assess the accuracy of the complete expression approach.

Numerical simulation of electromagnetic acoustic transducers using distributed point source method. Eskandarzade, T.

Kundu, Results from this analysis have been compared with the finite element method (FEM) based predictions. Results from this analysis have been compared with the finite element method (FEM) based predictions. Keywords : Electromagnetic acoustic transducers, nondestructive testing, tube, finite element model.

Introduction Steel tubes are key element in the area of energy industries. Corrosions and rusting may occur on them mainly because of the working environment they exist, which finally will due to.

The Finite Element Method for Electromagnetic Modeling. Editor(s): Gérard Meunier; this book provides a comprehensive review of the finite element method for low frequency applications. Fundamentals of the method as well as new advances in the field are described in detail.

Konrad's 79 research works with 1, citations and 2, reads, including: Computation of current densities in the receiving mode of electromagnetic acoustic transducers. Improved Finite Element Method for EMAT Analysis and Design R. Jafari-Shapoorabadi, Student Member, IEEE, A.

Konrad, Fellow, IEEE, and A. Sinclair, Member, IEEE Abstract— Electromagnetic acoustic transducers (EMATs) op-erating in transmitting mode are examined. Two different finite el. The most intense part of the ultrasonic wave should be at the measurement point itself.

In this paper, finite element simulation is used to optimize the structure of the classic racetrack coil bulk wave electromagnetic acoustic transducer to produce more intense, concentrated ultrasonic waves in a.

Surface wave is widely used to detect and locate the surface and sub-surface defects. A model has been developed for the calculation of surface wave generated by an electromagnetic acoustic transducer (EMAT) operating on the Lorentz principle by finite element method.

We establish the displacement model of surface wave based on acoustic theory in elastic solids. Abstract: Electromagnetic ultrasonic transducer is the core component of the electromagnetic ultrasonic testing equipment. This paper establishes a three-dimensional model of the electromagnetic ultrasonic transducer used to generate Lamb wave, then by uniform design experiment and finite element analysis, the paper obtains the.

Electromagnetic acoustic transducer (EMAT) is a transducer for non-contact acoustic wave generation and reception in conducting materials. Its effect is based on electromagnetic mechanisms, which do not need direct coupling with the surface of the material.

Due to this couplant-free feature, EMATs are particularly useful in harsh, i.e., hot, cold, clean, or dry environments. However, piezoelectric transducers cannot be used in high-temperature environments due to the irremovable couplant.

Therefore, an electromagnetic acoustic transducer (EMAT) based on electromagnetic coupling instead of a couplant is used to excite SH guided waves in the specimen, which is also suitable for high-temperature testing environments.

The noncontact nature of electromagnetic acoustic transducers (EMATs) offers a series of advantages over traditional piezoelectric transducers, but these features are counter-balanced by their relatively low signal-to-noise ratio and their strong dependence on material properties such as electric conductivity, magnetic permeability, and magnetostriction.

The implication is that full. A finite element method model has been computed to simulate the experiment, and the cause of the prominent enhancement in the inclined cracks is explained.

Electromagnetic acoustic transducers (EMATs) have been used in pitch-catch mode for a better characterization of surface cracks in metals. Electromagnetic acoustic transducers (EMATs) have been used in pitch-catch mode for a better characterization of surface cracks in metals.

The system, which combines the measurement of Rayleigh wave velocity in the in-plane and out-of-plane directions, has been used to understand the interaction of Rayleigh waves with inclined surface cracks.

This shows a stronger and more prominent. A balanced armature receiver (BAR) as a special type of electromagnetic acoustic transducers plays a significant role in reproduction of music and speech, active noise control in modern hearing aid and in contemporary in-ear monitors. This paper aims to present a static analysis of the balanced armature receiver based on the lumped network approach (LNA) and the finite element method.

Chapter 2 presents the theoretical basis of the Finite Element Method (FEM) for electromagnetic applications. The presented FEM theory is essential for preparing correct efficient simulation models, for mitigating simulation problems, and for assessing the quality and accuracy of the results obtained.

HIGHLIGHTSWe propose a wholly analytical model for meander‐line‐coil Dodd and Deed's solution adapted for the straight ion pattern of Rayleigh waves obtained with the proposed length's effect on the directivity of Rayleigh waves analysed quantitatively.

ABSTRACT This paper presents the simulation and experimental study of the radiation pattern of a meander. This paper presents the governing electrodynamic equations of electromagnetic acoustic transducers (EMATs) and extends them to the derivation of the magnetic- and acoustic-field equations in terms of the magnetic vector potential (MVP) and the acoustic wave particle displacement vector (PDV), respectively.

It also provides formulations for calculating forces and current densities in the case. A new type of electromagnetic-acoustic transducer (EMAT) has been developed that may be particularly suitable for use as an element of ultrasonic arrays.

The new transducer can generate and receive compact ultrasonic pulses that exhibit a component of polar­ ization parallel to the free surface.

In the plane of symmetry that. Previously, we developed a method based on FEM and FDTD for the study of an Electromagnetic Acoustic Transducer Array (EMAT). This paper presents a new analytical solution to the eddy current problem for the meander coil used in an EMAT, which is adapted from the classic Deeds and Dodd solution originally intended for circular coils.

Quantitative Simulation of Ultrasonic and EMAT Arrays using FEM and FDTD Y. Xie 2, W. Yin 4, A. Peyton 16 School of Electrical and Electronic Engineering; University of Manches Manchester, United Kingdom Ultrasonic Testing (UT), phased array, Modeling and Simulation, Finite difference time domain (FDTD) and Finite element method (FEM), Electromagnetic acoustic transducer (EMAT).

High Temperature Electromagnetic Acoustic Transducer for Guided Wave Testing A thesis submitted for the degree of Doctor of Finite Element Analysis (FEA) was performed for the optimization of the EMAT design An empirical method for the enhancement of EMAT.

A three-dimensional model for Rayleigh wave electromagnetic acoustic transducers operating on the Lorentz force mechanism has been established by combining the finite element method and analytical calculation.

Rayleigh waves generated by the Lorentz forces due to the static magnetic field and the dynamic magnetic field are calculated. For numerical efficiency, time-harmonic analysis is carried out and a technique to extract data corresponding to target guided wave modes is used.

The validity of the developed finite element analysis is checked by comparing the simulated wave radiation patterns from the present analysis with experimental results. This paper discusses finite element modeling of spiral coil electromagnetic acoustic transducer (EMAT) to generate bulk waves.

First, a 2D electromagnetic model is developed for calculating the Lorentz force density, which is the driving force for sound wave generation within the material.

Second, the calculated force at each point in the material is used as the driving force for. toring of pipelines. First, the excitation mechanism of the transducer is simulated by analyzing the eddy current and the static magnetic field using the finite element method.

An electromagnetic acoustic transducer transformer model is pre-sented which describes the eddy current generation transfer function and the ultrasound excitation. The paper contains an original comprehensive review of finite element analysis (FEA) applied by researchers to calibrate and improve existing and developing electromagnetic non-destructive testing and evaluation techniques, including but not limited to magnetic flux leakage (MFL), eddy current testing, electromagnetic-acoustic transducers (EMATs).

demonstrate that the developed flexible photo-acoustic transducer can be a good alternative method for the SHM. Keywords: Laser ultrasonic transducer, photo-acoustic effect, Lamb waves, synthetic aperture focusing imaging, structural used the finite element analysis to simulate the failure caused by the bolting of the electromagnetic.

Electromagnetic Acoustic Transducers (EMATs) are non-contact transducers, have simple designs, and can be used with GWT to inspect moving structures, high temperature objects or structures under vacuum, such as absorber tubes. (CFD) finite element analysis.

In Section 4, the PPM EMAT prototype and preliminary high temperature tests are.This paper describes an approach for measuring material plasticity using contactless electromagnetic acoustic method. Harmonic generation from noncumulative fundamental longitudinal wave in specimen is studied based on numerical method, and the contribution to harmonic generation from tensile damage is shown to be higher than that from a geometric factor; more serious damages increase the.This dissertation focuses on the development of high frequency phased array transducers for two specific applications scanning acoustic microscopy, and biometric imaging for small electronics.

Closed-loop finite element studies were conducted in three dimensions using PZFlex, a commercial finite-element method software.