scholarly journals Physical modeling of metamatereals on the basis of the flat spiral coil

2020 ◽  
Vol 6 (4) ◽  
pp. 18-30
Author(s):  
Z.R. Idiatullov ◽  
◽  
I.I. Ahmetov ◽  
M.M. Fatyhov ◽  
S.V. Spiridonov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Transmission Coefficient ◽  
Physical Modeling ◽  
Geometric Shape ◽  
Spiral Coil ◽  
Geometric Shapes ◽  
Modeling Methods ◽  
Spiral Coils ◽  
Flat Spiral

In this work, the problems of physical modeling of metamaterials based on flat spiral coils with different geometric shapes were considered. The main parameters of the structures metamaterial modeling, methods of creation, as well as their unique properties are considered. As a result of physical modeling, structures were obtained that model the metamaterial with different values of dimensions and parameters. On the basis of the experimental data, the best variant of the geometric shape of the structure element was determined, based on the highest transmission coefficient.

scholarly journals Electromagnetic Forming Analysis of the Al 99.0 Sheet with Tools of Different Configurations

2019 ◽  
Vol 290 ◽  
pp. 03010
Author(s):  
Dorin Luca ◽  
Cristina Biriş ◽  
Dorian Luca
Keyword(s):  
Electromagnetic Forming ◽  
Forming Process ◽  
Spiral Coil ◽  
Maximum Deformation ◽  
Manufacturing Procedure ◽  
Forming Analysis ◽  
Deformation Force ◽  
Spiral Coils ◽  
Flat Spiral ◽  
The Mathematical Model

Electromagnetic forming is an advanced manufacturing procedure, characterized by the fact that the tool carrying the deformation force does not touch the workpiece. This paper presents research regarding the electromagnetic forming of Al 99.0 (EN AW-1200) sheet with coils, having different configurations. The purpose of the research was to find the flat spiral coil configuration that ensures maximum deformation of the workpiece. Flat spiral coils with different gaps between the coil and the workpiece, and coils with different number of windings were tested. The influence of these parameters was monitored on the maximum strain of the free bulged parts. The analysis of the results obtained for different configurations of the flat spiral coils allowed the selection of the significant parameters that influenced the electromagnetic forming process of the Al 99.0 flat workpiece, which aimed to elaborate the mathematical model and to optimize the investigated process.

scholarly journals Моделирование проводимости Капицы через шероховатые интерфейсы между твердыми телами

2021 ◽  
Vol 63 (7) ◽  
pp. 982
Author(s):  
Б. Лю ◽  
В.И. Хвесюк ◽  
А.А. Баринов
Keyword(s):  
Experimental Data ◽  
Theoretical Prediction ◽  
Transmission Coefficient ◽  
Wide Temperature Range ◽  
Acoustic Waves ◽  
Theoretical Method ◽  
Interface Roughness ◽  
Kapitza Conductance ◽  
Acoustic Mismatch ◽  
The Difference

In this work, we have formulated and solved the problem of determining the Kapitza conductance across the interface between two solids, taking into account the interface roughness. We use a modified acoustic mismatch model (AMM). The difference from the classic model is that the dispersion properties of acoustic waves are considered. A significant advantage of this model is that the theoretical prediction agrees well with experimental data over a wide temperature range: from 30K to more than 300K. Finally, a theoretical method with the statistical distribution of roughness profiles is used to determine the energy transmission coefficient across the interface.

scholarly journals ANALYSIS OF THE CURRENT STATE OF RESEARCHES OF THE DEPOSITION OF ASPHALT-RESINOUS SUBSTANCES, PARAFFIN, AND MODELING METHODS. REVIEW PART II: WAX DEPOSITION

2021 ◽  
pp. 13-23
Author(s):  
M.R. Manafov ◽  
◽  
G.S. Aliyev ◽  
A.I. Rustamova ◽  
V.I. Kerimli ◽  
...  
Keyword(s):  
Experimental Data ◽  
Kinetic Model ◽  
Deposition Process ◽  
Real Field ◽  
Wax Deposition ◽  
Scaling Effect ◽  
Modeling Methods ◽  
Current State ◽  
Simulation Results ◽  
Reliable Interpretation

The mechanism of paraffin formation in transport pipes is briefly discussed. A kinetic model of the formation and wax deposition from oil is proposed. Comparison of the model with the available experimental data gave satisfactory results. The review considers software tools for modeling the wax deposition process. It is noted that the simulation results are not always applicable to real field cases. For a more reliable interpretation, the scaling effect must be taken into account. In the work various technologies for wax removal are considered

FEA Tire Modeling and Validation Techniques

2015 ◽  
Author(s):  
Mehrsa Marjani ◽  
Moustafa El-Gindy ◽  
David Philipps ◽  
Fredrik Öijer ◽  
Inge Johansson
Keyword(s):  
Experimental Data ◽  
Dynamic Characteristics ◽  
Rolling Resistance ◽  
Vertical Acceleration ◽  
Virtual Model ◽  
Static And Dynamic Characteristics ◽  
Modeling Methods ◽  
Truck Tire ◽  
Tire Modeling ◽  
Tire Models

Recent advances in power and efficiency of computerized modeling methods has made it easier to develop accurate tire models. These newer models are now created with such accuracy that it has become easy to predict the experimental tire’s behavior and characteristics. These models are helpful with determining tire, tire-road, and tire-soil interaction properties. By creating virtual models, the overall capital for research and development can be reduced as well as replacing unavailable experimental tires for research. This research paper mainly focuses on the validation of computer generated FEA tire models which are then used for the prediction of the experimental tire’s rolling resistance, static and dynamic characteristics. Experimental data, such as rolling resistance and vertical acceleration are used in validation simulations in order to tune the virtual model to match the experimental tire’s behavior. The tire that was used for this research is a six-groove 445/50R22.5 FEA truck tire, which was constructed and validated over the course of this research.

Strip Size Optimization for Spiral Type Actuator Coil Used in Electromagnetic Flat Sheet Forming Experiment

2021 ◽  
Vol 875 ◽  
pp. 35-41
Author(s):  
Shakeel Akbar ◽  
Muhammad Adeel Aleem ◽  
Faisal Pirandad ◽  
Ahnaf Usman Zillohu ◽  
Muhammad Saifullah Awan ◽  
...  
Keyword(s):  
Lorentz Force ◽  
Eddy Currents ◽  
Sheet Forming ◽  
Width Ratio ◽  
Work Piece ◽  
Copper Strip ◽  
Cross Sectional ◽  
Spiral Coil ◽  
S Factor ◽  
Flat Spiral

Flat spiral coil for electromagnetic forming system has been modelled in FEMM 4.2 software. Copper strip was chosen as material for designing the actuator coil. Relationship between height to width ratio (S-factor) of the copper strip and coil’s performance has been studied. Magnetic field intensities, eddy currents and Lorentz force were calculated for the coils that were designed using six different 'S-factor' values (0.65, 0.75, 1.05, 1.25, 1.54 and 1.75), keeping the cross-sectional area of strip same. Results obtained through simulation suggest that actuator coil with S-factor ~ 1 shows optimum forming performance as it exerts maximum Lorentz force (84 kN) on work piece. The same coils was fabricated and used for electromagnetic sheet forming experiments. Aluminum 6061 sheets of thickness 1.5 mm have been formed using different voltage levels of capacitor bank. Smooth forming profiles were obtained with dome heights 28, 35 and 40 mm in work piece at 800, 1150 and 1250 V respectively.

Hydrodynamic performance of a newly-designed Antarctic krill trawl using numerical simulation and physical modeling methods

2019 ◽  
Vol 179 ◽  
pp. 173-179 ◽  
Author(s):  
Rong Wan ◽  
Mingxiu Jia ◽  
Qinglong Guan ◽  
Liuyi Huang ◽  
Hui Cheng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Physical Modeling ◽  
Antarctic Krill ◽  
Hydrodynamic Performance ◽  
Modeling Methods

Sheet metal electromagnetic forming using a flat spiral coil: Experiments, modeling, and validation

2019 ◽  
Vol 263 ◽  
pp. 408-422 ◽  
Author(s):  
Evandro Paese ◽  
Martin Geier ◽  
Roberto P. Homrich ◽  
Pedro Rosa ◽  
Rodrigo Rossi
Keyword(s):  
Sheet Metal ◽  
Electromagnetic Forming ◽  
Spiral Coil ◽  
Flat Spiral

scholarly journals Device for automated magnetic pulse stimulation of plant production processes

2020 ◽  
Vol 161 ◽  
pp. 01064
Author(s):  
Dmitriy Khort ◽  
Igor Smirnov ◽  
Alexey Kutyrev ◽  
Rostislav Filippov
Keyword(s):  
Magnetic Field ◽  
Plant Immunity ◽  
Low Frequency ◽  
Electrical Circuit ◽  
Plant Production ◽  
Physical Factors ◽  
Magnetic Pulse ◽  
Spiral Coil ◽  
Frequency Magnetic Field ◽  
Flat Spiral

Numerous studies of various physical factors show the promise of using pulsed magnetic fields in bioregulatory technologies to stimulate plant life and growth processes. As a result of exposure to garden strawberries with a low-frequency magnetic field, the quality of planting material improves, plant immunity increases, crop growth and development accelerates, the number and weight of berries increase. The article presents a developed automated device for magnetic pulse processing (MPP) of plants, considers the device, design and principle of its operation. The electrical circuit of the device and its technical characteristics are given. According to the results of a laboratory experiment, the magnetic field parameters of the working body of the device in the near zone of a flat spiral coil were established. The numerical value of the magnetic induction at a distance of 100 mm from the center of the coil is 8.3 mT.

Effects of the inner/outer diameters of flat spiral coils on electromagnetic sheet metal formation

2020 ◽  
Vol 109 (5-6) ◽  
pp. 1541-1551
Author(s):  
Ning Liu ◽  
Zhipeng Lai ◽  
Quanliang Cao ◽  
Yujie Huang ◽  
Meng Chen ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Spiral Coils ◽  
Flat Spiral

PHYSICAL MODELING OF DAMPING CHARACTERISTICS OF MR FLUIDS

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2704-2710
Author(s):  
JEROME SARRAZIN ◽  
JEROME CLARACQ ◽  
JEAN-PIERRE MONTFORT
Keyword(s):  
Experimental Data ◽  
Physical Modeling ◽  
Magnetic Force ◽  
Viscoelastic Behavior ◽  
Complex Shear Modulus ◽  
Mechanical Spectroscopy ◽  
Viscous Forces ◽  
Damping Characteristics ◽  
Mr Fluids ◽  
Complex Shear

The behavior of MR fluids involved in industrial devices is often modeled by analogical models which do no link the parameters with the physical properties of the fluid. From the equations of fluid mechanics, we give a physical meaning to parameters such as friction, elastic and mass coefficients used in the mentioned models. The predictions are checked with experimental data which mimic the behavior of devices such as antiseismic systems. The viscoelastic behavior of MR fluids is characterized by mechanical spectroscopy. The complex shear modulus G *(ω) contains all the information about the restoring and viscous forces. For example, the relation between elastic modulus, yield stress and magnetic force is discussed in terms of strain amplitude.

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