A hybrid finite element model for simulation of electromagnetic acoustic transducer (EMAT) based plate waves

Dhayalan, R.; Balasubramaniam, Krishnan

doi:10.1016/j.ndteint.2010.05.008

Cited by 58 publications

(39 citation statements)

References 27 publications

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“…Electromagnetic acoustic transducers (EMATs) are becoming increasingly popular due to their noncontact nature [17,18]. An EMAT sensor typically consists of a permanent magnet providing a large static magnetic field and a coil carrying an alternating current which is placed next to the test piece [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…An EMAT sensor typically consists of a permanent magnet providing a large static magnetic field and a coil carrying an alternating current which is placed next to the test piece [19][20][21]. There are two EMAT interactions which can produce ultrasound: magnetostriction for magnetic materials and the Lorentz force mechanism for conducting metallic materials [18,20,22]. Because an EMAT generates ultrasonic waves directly into the testing piece instead of coupling through the transducer, an EMAT has advantages in applications where surface contact is not possible or desirable [23,24].…”

Section: Introductionmentioning

confidence: 99%

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Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD

et al. 2016

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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. The analytical solution resulting from this novel adaptation exploits the large radius extrapolation and shows several advantages over the finite element method (FEM), especially in the higher frequency regime. The calculated Lorentz force density from the analytical EM solver is then coupled to the ultrasonic simulations, which exploit the finite-difference time-domain (FDTD) method to describe the propagation of ultrasound waves, in particular for Rayleigh waves. Radiation pattern obtained with Hilbert transform on time-domain waveforms is proposed to characterise the sensor in terms of its beam directivity and field distribution along the steering angle, which can produce performance parameters for an EMAT array, facilitating the optimum design of such sensors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD

et al. 2016

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“…Dhayalan [100] presented a numerical analysis of multimode Lamb waves interacting with artificial defects and compares these calculations with measurements on a thin aluminium plate. They started with a 2D electromagnetic model (COMSOL software), reinserting resultant Lorentz forces into a subsequent ultrasonic computation (ABAQUS Explicit).…”

Section: Emats (Electromagnetic Acoustic Transducers)mentioning

confidence: 99%

Finite Element Method Applied in Electromagnetic NDTE: A Review

Augustyniak

Usarek

2016

J Nondestruct Eval

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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 detection and modelling of magnetic field, as the vast majority of ENDT involves magnetic induction, either as a primary variable MFL or a complementary phenomenon (EC, EMATs). FEA is shown as a fit-for-purpose tool to design, understand and optimise ENDT systems, or a Reference for other modelling algorithms. The review intentionally omits the fundamentals of FEA and detailed principles of NDT. Strain-stress FEA applications in NDT, especially in ultrasonography and hole-drilling methodology, deserve as well a separate study.

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“…Because an EMAT generates ultrasonic waves directly into the testing piece instead of coupling through the transducer, it has advantages in applications where surface contact is not possible or desirable [14,15]. Another attractive feature of EMAT is that a variety of waves modes can be produced based on different combinations of coils and magnets [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…There are two EMAT interactions which can produce ultrasound: the magnetostriction mechanism and the Lorentz force mechanism; both the magnetostriction mechanism and the Lorentz force mechanism are for ferromagnetic materials while only the Lorentz force mechanism is for conductive metallic materials [16,18,19]. In this paper, only EMAT based on Lorentz force mechanism to generate Rayleigh waves is discussed.…”

Section: Introductionmentioning

confidence: 99%

Directivity analysis of meander-line-coil EMATs with a wholly analytical method

et al. 2017

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This paper presents the simulation and experimental study of the radiation pattern of a meander-line-coil EMAT. A wholly analytical method, which involves the coupling of two models: an analytical EM model and an analytical UT model, has been developed to build EMAT models and analyse the Rayleigh waves' beam directivity. For a specific sensor configuration, Lorentz forces are calculated using the EM analytical method, which is adapted from the classic Deeds and Dodd solution. The calculated Lorentz force density are imported to an analytical ultrasonic model as driven point sources, which produce the Rayleigh waves within a layered medium. The effect of the length of the meander-line-coil on the Rayleigh waves' beam directivity is analysed quantitatively and verified experimentally.

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A hybrid finite element model for simulation of electromagnetic acoustic transducer (EMAT) based plate waves

Cited by 58 publications

References 27 publications

Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD

Simulation of an Electromagnetic Acoustic Transducer Array by Using Analytical Method and FDTD

Finite Element Method Applied in Electromagnetic NDTE: A Review

Directivity analysis of meander-line-coil EMATs with a wholly analytical method

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