Finite Element Analysis of Stationary Magnetic Field

Virjoghe, Elena Otilia; Enescu, Diana; Stan, Mihail-Florin; Ionel, Marcel

doi:10.5772/50846

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…Thus far, researchers have identified several effective methods for solving magnetic field problems, including the Ohm's law method [26], the magnetic field division method [27], and the numerical method [28]. However, the finite element method has been shown to have incomparable advantages in electromagnetic field analysis [29]. Its basis is Maxwell's equations, the differential forms of which are given by…”

Section: Finite Element Solution For the Magnetic Field Problemmentioning

confidence: 99%

Finite Element Solutions for Magnetic Field Problems in Terfenol-D Transducers

Teng

2020

Sensors

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An appropriate magnetic design helps ensure that the Terfenol-D (Terbium- Dysprosium-Iron alloy) rods in giant magnetostrictive transducers have the perfect magnetostriction ability. To determine the optimum Terfenol-D rod state, a segmented stack configuration comprised by the Terfenol-D rods and NdFeB (neodymium-iron-boron) permanent magnets is presented. The bias magnetic field distributions simulated through the finite element method indicate that the segmented stack configuration is one effective way to produce the desired bias magnetic field. Particularly for long stacks, establishing a majority of domain to satisfy the desired bias magnetic field range is feasible. On the other hand, the eddy current losses of Terfenol-D rods are also the crucial to their magnetostriction ability. To reduce eddy current losses, the configuration with digital slots in the Terfenol-D rods is presented. The induced eddy currents and the losses are estimated. The simulations reveal that the digital slots configuration decreases the eddy current losses by 78.5% compared to the same size Terfenol-D rod with only a hole. A Terfenol-D transducer prototype has been manufactured using a Terfenol-D rod with a mechanical prestress of about 10 MPa and a bias magnetic field of about 42 kA/m. Its maximum transmitting current response of 185.4 dB at 3.75 kHz indicates its practicability for application as an underwater projector.

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Section: Finite Element Solution For the Magnetic Field Problemmentioning

confidence: 99%

Finite Element Solutions for Magnetic Field Problems in Terfenol-D Transducers

Teng

2020

Sensors

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“…The use of FEM analysis in the design of an electromagnetic device allows to evaluate its performance and detect some problems at an early stage [12]. FEM analysis is based on the mathematical evaluation of a model on the continuous domain in the discrete domain.…”

Section: Fem Simulationsmentioning

confidence: 99%

Design, simulation, and fabrication of an ingestible capsule with gastric balloon for obesity treatment

Freitas¹,

Rodrigues²,

Puga³

et al. 2021

Biomed. Phys. Eng. Express

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The treatment of obesity based only on lifestyle changes has been shown ineffectiveness in a long-term period. The development of more definitive and non-invasive therapies has been the subject of study. In this paper, a magnetically driven ingestible capsule with the capacity to inflate a gastric balloon is devised, simulated, and fabricated. The balloon is inflated to a volume of 150 ml using an acid-base reaction between citric acid and potassium bicarbonate. Finite element method simulations were performed to study the interaction between the permanent external magnet and the ingestible capsule and confirm the magnetic activation mechanism. A fabrication process was proposed to manufacture a polydimethylsiloxane (PDMS) balloon in a simple, functional, and reproducible way. The two layers and 1:8 ratio balloons are the most cost-effective without compromising their mechanical properties. The capsule body parts manufactured by a three-dimensional (3D) printing process -Digital Light Processing (DLP) showed high accuracy and excellent resolution. This study demonstrated that the proposed ingestible capsule would successfully inflate the gastric balloon to treat obesity.

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An Educational Study of Electromagnetic Phenomena on Ferromagnetic Structure Using a Software Environment

Oyman Serteller

2023

Proc. Natl. Acad. Sci., India, Sect. A Phys. Sci.

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The solution to electromagnetic problems relies on complex numerical differential equations that are difficult to understand. Therefore, it is crucial to analyze them step by step and visualize them in a computer environment, even by developing a program. This approach enhances understanding of the subject and facilitates further research. In this study, an electromagnetic phenomenon is examined on a ferromagnetic structure using the Maxwell 2D static-elliptical partial differential equation within a developed software environment. The paper covers all aspects, ranging from the mathematical model and analysis solution to the fundamental operating parameters and characteristics, with a focus on educational purposes. The modeling and software development have been executed in a user-friendly manner, enabling students to apply various numerical techniques to practical problems while maintaining control over the entire modeling process. Through this study, it is anticipated that the transition from theory to practice can be facilitated more smoothly and directly. The theoretical analysis has been conducted using Mathematica software, and a comparison with finite element magnetic method simulation on a typical magnetic structure has been presented to illustrate the analogy. A comprehensive analysis of the Maxwell static-elliptical electromagnetic equation, based on a 2D numerical solution within a specific domain, has been performed in a detailed and unambiguous manner, utilizing different equation forms, boundary conditions, and ferromagnetic materials, all for educational purposes.

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Finite Element Analysis of Stationary Magnetic Field

Cited by 6 publications

References 3 publications

Finite Element Solutions for Magnetic Field Problems in Terfenol-D Transducers

Finite Element Solutions for Magnetic Field Problems in Terfenol-D Transducers

Design, simulation, and fabrication of an ingestible capsule with gastric balloon for obesity treatment

An Educational Study of Electromagnetic Phenomena on Ferromagnetic Structure Using a Software Environment

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