scholarly journals Визуализация динамических вихревых структур в магнитных пленках с одноосной анизотропией (микромагнитное моделирование)

2018 ◽  
Vol 60 (2) ◽  
pp. 294
Author(s):  
В.В. Зверев ◽  
И.М. Изможеров ◽  
Б.Н. Филиппов
Keyword(s):  
Computer Simulation ◽  
Domain Boundary ◽  
Vortex Structures ◽  
Analytical Models ◽  
Dynamic Processes ◽  
Topological Properties ◽  
Soft Magnetic ◽  
Magnetization Dynamics ◽  
Planar Anisotropy ◽  
Moving Domain

AbstractThree-dimensional computer simulation of dynamic processes in a moving domain boundary separating domains in a soft magnetic uniaxial film with planar anisotropy is performed by numerical solution of Landau-Lifshitz-Gilbert equations. The developed visualization methods are used to establish the connection between the motion of surface vortices and antivortices, singular (Bloch) points, and core lines of intrafilm vortex structures. A relation between the character of magnetization dynamics and the film thickness is found. The analytical models of spatial vortex structures for imitation of topological properties of the structures observed in micromagnetic simulation are constructed.

Characterization of a soft magnetic composite for use in road-embedded wireless-charging systems

2021 ◽  
pp. 1-10
Author(s):  
Kai-Yeung Li ◽  
Bill Trompetter ◽  
Maedeh Amirpour ◽  
Tom Allen ◽  
Simon Bickerton ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Flexural Modulus ◽  
Magnetic Core ◽  
Analytical Models ◽  
Magnetic Composite ◽  
Wireless Charging ◽  
Soft Magnetic ◽  
Soft Magnetic Composite ◽  
Trade Offs ◽  
Wheel Loading

The ferrite magnetic core is an integral component of road-embedded wireless charging systems for electric vehicles. However, the brittleness of ferrite makes it susceptible to premature fracture due to cyclic wheel loading from vehicles. This has motivated the development of a soft magnetic composite (SMC) composed of a flexible polyurethane and crushed ferrite as an alternative. An experimental investigation was conducted into the trade-offs between mechanical, thermal and magnetic properties at ferrite volume fractions between 45.9[Formula: see text]vol% and 80.6[Formula: see text]vol%. A comparison was made between measured properties and predictions from analytical models in order to further investigate the characteristics of the composite. The investigation showed a trade-off between the increase in magnetic permeability and the reduction in strain-to-failure as ferrite volume fraction increased. In addition, a large increase in flexural modulus and thermal conductivity, along with a slight increase in flexural strength was observed. More importantly, the strain-to-failure of the composite was 20 times higher than that of ferrite even at the highest volume fraction, indicating that the SMC was successful in providing a more ductile and flexible alternative.

scholarly journals Dynamic model of speed control through ring gears in a device with a multistage gear differentials and closed-loop hydraulic systems

2020 ◽  
Vol 99 (3) ◽  
pp. 102-111
Author(s):  
O. Strilets
Keyword(s):  
Computer Simulation ◽  
Quantitative Analysis ◽  
Closed Loop ◽  
Speed Control ◽  
Dynamic Processes ◽  
The Sun ◽  
Hydraulic Systems ◽  
Lagrange Method ◽  
Last Stage ◽  
Gear Differential

The dynamic processes in the device for speed control with multistage gear differential and closed-loop hydraulic systems through ring gears have been studied for case when the leading link is the sun gear of the first stage, and the driven is a carrier of the last stage. For such a device, the equation of kinetic energy has been compiled and the dynamics equations have been obtained by the Lagrange method, which have been solved. The obtained results are the basis for further computer simulation on and quantitative analysis to assess the performance of such devices and select the necessary closed-loop hydraulic systems to control speed changes.

scholarly journals Computer simulation of free settling and skeletal settling during liquid phase sintering

2006 ◽  
Vol 38 (1) ◽  
pp. 41-54 ◽  
Author(s):  
Z.S. Nikolic
Keyword(s):  
Computer Simulation ◽  
Liquid Phase ◽  
Solid Phase ◽  
Boundary Migration ◽  
Domain Boundary ◽  
Numerical Procedure ◽  
Simulation Models ◽  
Liquid Phase Sintering ◽  
Solid Skeleton ◽  
Two Stages

In recent years, a range of computer simulation models leading to a better understanding of liquid phase sintering phenomena, have been developed with the aim of simulating the detailed evolution of microstructure during grain growth. Some liquid phase sintered materials show both macrostructural and microstructural effects associated with gravity force. Therefore we will develop a numerical procedure for the estimation of how much gravity will influence domain (two-dimensional particle representation) growth, domain boundary migration and solid skeleton formation due to gravity induced segregation during liquid phase sintering. The method used for the simulation of a gravity field will be based on the settling procedure. Gravity induced settling will be separated into two stages - Free Settling and Skeletal Settling. Isolated solid phase domains fall under gravity and slide down over the already settled domains (free settling). During settling they make point contacts with each other. Necks between them then form and start to grow until the equilibrium dihedral angle between the domain boundaries and the liquid is established. Thus a solid skeleton forms and skeletal settling of a connected solid structure takes place. .

TENSOR STRESS ASYMMETRY AS A MECHANISM FOR THE FORMATION OF DIPOLE VORTEX INTO THE JET FLOW IN THE COASTAL ZONE

2018 ◽  
Author(s):  
А. Даньшина ◽  
A. Dan'shina ◽  
В. Чанцев ◽  
V. Chancev
Keyword(s):  
Computer Simulation ◽  
Stress Tensor ◽  
Coastal Zone ◽  
Laboratory Experiments ◽  
Jet Flow ◽  
Vortex Structures ◽  
Dipole Vortex ◽  
Stress Asymmetry

The theoretical conclusions about the effect of asymmetry of the stress tensor on the formation of dipolar vortex structures are built on the basis of laboratory experiments. The results of computer simulation of the mushroom current are provided.

Outlook on Magnetization Dynamics

2017 ◽  
Author(s):  
Olle Eriksson ◽  
Anders Bergman ◽  
Lars Bergqvist ◽  
Johan Hellsvik
Keyword(s):  
First Principles ◽  
Spin Dynamics ◽  
Dynamic Processes ◽  
Original Formulation ◽  
Magnetization Dynamics ◽  
Switching Dynamics ◽  
Theoretical Investigations ◽  
Ultrafast Switching ◽  
Dynamics Simulations

Since its original formulation in the mid-1990's, atomistic spin-dynamics has become an important tool for modelling of dynamic processes in magnetic materials. So far this book has described current methodological methods and functionalities of atomistic spin-dynamics simulations. Applications of DFT and ASD techniques to selected topics have been presented in this book, for instance methods for calculation of the microscopic Heisenberg and Gilbert parameter from first principles (Chapters 2 and 6), multiscale modelling of magnon spectra in bulk and thin film magnets (Chapter 9), and theoretical investigations of ultrafast switching dynamics in ferromagnets and ferrimagnets (Chapter 10), and of exotic dynamics of topologically protected spin textures (Chapter 11). In this closing chapter we give an outlook on recent and anticipated developments of the methodology.

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