scholarly journals Impact of Magnetic Field on Variation of Partial Discharges Parameters in the Insulation Model with a Distributed Defect

2020 ◽  
Vol 20 (4) ◽  
pp. 64-69
Keyword(s):  
Magnetic Field ◽  
Experimental Technique ◽  
Partial Discharges ◽  
Experimental Results ◽  
Alternating Magnetic Field ◽  
Data Series ◽  
Experimental Setup ◽  
Mathematical Methods ◽  
New Phase ◽  
The Magnetic Field

The paper presents the experimental results of studies into the influence of an alternating magnetic field on the changes in the partial discharges parameters in the model of insulation with a distributed defect. The studies were carried out on a developed experimental setup, isolation model and based on the author's experimental technique. The research confirms the influence of the magnetic field on changes in the amplitude, number of pulses and intensity of partial discharges in practice. The analysis of the obtained data series for the reliability of differences was carried out using mathematical methods. Based on the results of the analysis of the phase-distributed patterns of the occurrence of partial discharges, the repeated appearance of additional discharges in new phase windows under the additional action of an alternating magnetic field was established.

Experimental Research on the Magnetic Field Sensitive Polymeric Actuator

2011 ◽  
Vol 287-290 ◽  
pp. 603-607
Author(s):  
Chun Lin Xia ◽  
Yang Fang Wu ◽  
Qian Qian Lu
Keyword(s):  
Magnetic Field ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Energy Conversion ◽  
Experimental Research ◽  
Experimental Results ◽  
Deformation Characteristics ◽  
Analysis Software ◽  
Element Analysis ◽  
The Magnetic Field

Using domestic MFSP membrane as a medium of energy conversion, a kind of MFSP actuator was designed. The dedicated test equipment was constructed for experimental research, and the experimental results were given. The strip and circular MSFP membrane were analyzed qualitatively to obtain the deformation characteristics of membrane by finite element analysis software.

Brownian Dynamics Simulations of Aggregation Phenomena in a Magnetic Particle Suspension With an Alternating Magnetic Field (Relationship Between the Aggregate Structure and the Heat Production)

2018 ◽  
Author(s):  
Seiya Suzuki ◽  
Akira Satoh ◽  
Muneo Futamura
Keyword(s):  
Magnetic Field ◽  
Heat Production ◽  
Brownian Dynamics ◽  
Magnetic Particle ◽  
Particle Interaction ◽  
Alternating Magnetic Field ◽  
Dynamics Simulations ◽  
Brownian Dynamics Simulations ◽  
The Magnetic Field ◽  
Aggregation Phenomena

The present study addresses physical phenomena of a suspension composed of magnetic spherical particles in an alternating magnetic field in order to elucidate particle aggregation phenomena and their influence on heat production. For this objective, we have performed Brownian dynamics simulations in a variety of circumstances of the magnetic field strength and frequency of an alternating magnetic field, and the magnetic dipole-dipole interaction strength. As in a time-independent uniform external magnetic field, large aggregates are formed in the case of strong magnetic particle-particle interactions. However, these clusters exhibit completely different behaviors that are dependent on the frequency of an alternating magnetic field. If the frequency is significantly high, then the viscous torque is the dominant factor, so that the formation of the clusters is not significantly influenced by the time-dependent magnetic field. If the frequency is significantly low, the magnetic field have a significant effect on the rotational motion of the particles, so that the formation of the cluster is dependent on which factor dominates the particle motion between the applied magnetic field and the magnetic particle-particle interaction. If the magnetic interaction is more dominant than the external field, stable chain-like clusters are formed in the field direction, and the magnetic particle-particle interaction induces a significant delay for the moments inclining in the alternating magnetic field direction. This behavior gives rise to a hysteresis loop with a larger area and therefore a large heating effect is obtained.

Viscosity of Potassium Dihydrogen Phosphate Aqueous Solution within Magnetic Field

2017 ◽  
Vol 898 ◽  
pp. 1783-1786
Author(s):  
Lei Zhang ◽  
Yi Su ◽  
Yu Lin Wu ◽  
Yao Liu ◽  
Yong Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Aqueous Solution ◽  
Field Intensity ◽  
Magnetic Field Intensity ◽  
Extreme Values ◽  
Potassium Dihydrogen Phosphate ◽  
Experimental Results ◽  
Dihydrogen Phosphate ◽  
Potassium Dihydrogen ◽  
The Magnetic Field

The viscosity of potassium dihydrogen phosphate, KH2PO4 (KDP), aqueous solution within magnetic field was studied. Experimental results showed that, the viscosity of saturated KDP solution exhibited multiple extreme values when the magnetic field intensity increased from 0 Gs to 2250 Gs. Influences of the magnetic field intensity on the viscosity of KDP solution were very complicated. It’s concerned with the temperature and the concentration of solution. As the KDP was produced from aqueous solution within magnetic field, the temperature and the concentration of solution also needed to be carefully controlled. Magnetic field with intensity values of 300 Gs, 600 Gs and 1800 Gs, all have the strong effects on the structures of KDP aqueous solution.

Comparison on Effect of Alternating and Stationary Magnetic Field on the Conductivity of NaCl Solutions

2011 ◽  
Vol 391-392 ◽  
pp. 1095-1099
Author(s):  
Lei Chen ◽  
Nan Li ◽  
Feng Chai ◽  
Shu Kang Cheng
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Moment ◽  
Experimental Results ◽  
Alternating Magnetic Field ◽  
Stationary Magnetic Field ◽  
Conductivity Change

NaCl solutions of different concentrations were exposed to alternating and stationary magnetic fields. The conductivity change of the NaCl solutions was measured. The change of the conductivity of the NaCl solutions under different amplitudes magnetic fields was studied. The differences of effect between stationary and alternating magnetic field on the conductivity of the NaCl solutions was compared. The principle of the effects of magnetic fields on conductivity of NaCl solutions was discussed. The process of magnetic moment deflexion effected by the alternating magnetic field was analyzed, which explained the experimental results that the conductivity was increased more larger when then the NaCl solutions were exposing to alternating magnetic field than stationary magnetic field.

Analysis of Vibration Characteristics of Magnetorheological Elastomer Sandwich Beam under Non-Homogeneous Magnetic Field

2011 ◽  
Vol 101-102 ◽  
pp. 202-206 ◽  
Author(s):  
Guo Liang Hu ◽  
Miao Guo ◽  
Wei Hua Li
Keyword(s):  
Magnetic Field ◽  
Natural Frequency ◽  
Sandwich Beam ◽  
Homogeneous Magnetic Field ◽  
Experimental Results ◽  
Magnetorheological Elastomer ◽  
Test Rig ◽  
Thin Aluminum ◽  
Set Up ◽  
The Magnetic Field

In this study, the MRE was manufactured, and the sandwich beam was also fabricated by treating with MRE between two thin aluminum layers. The experiment test rig was set up to investigate the vibration response of the MRE sandwich beam under non-homogeneous magnetic field. The experimental results show that the MRE sandwich beam had the capabilities of left shifting first natural frequency when the magnetic field was increased in the activated regions. It is also obvious that the first natural frequency of the MRE sandwich beam decreased as the magnetic field that applied on the beam was moved from the clamped end of the beam to the free end of the beam.

Effect of Magnetostatic Energy on the Magnetic Driving Forces and Field Induced Superelastic Behavior in Ni-Mn-Ga

2013 ◽  
Vol 738-739 ◽  
pp. 405-410 ◽  
Author(s):  
Alexander A. Likhachev
Keyword(s):  
Magnetic Field ◽  
Driving Forces ◽  
Theoretical Concept ◽  
Experimental Results ◽  
Magnetostatic Energy ◽  
Mechanical Cycling ◽  
Magnetostatic Coupling ◽  
Superelastic Behavior ◽  
The Magnetic Field

Abstract. Present publication gives a general theoretical concept and also presents the relevant experimental results concerning the effect of the magnetostatic coupling between the twin layers on the magnetic-field-controlled superelastic behavior during the mechanical cycling in magnetic field in Ni-Mn-Ga.

scholarly journals Precessing Ball Solitons in Kinetics of a Spin-Flop Phase Transition

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
V. V. Nietz
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Uniaxial Anisotropy ◽  
Precession Frequency ◽  
Initial Condition ◽  
Configuration Energy ◽  
Wide Range ◽  
Kinetics Of ◽  
New Phase ◽  
The Magnetic Field

The fundamentals of precessing ball solitons (PBS), arising as a result of the energy fluctuations during spin-flop phase transition induced by a magnetic field in antiferromagnets with uniaxial anisotropy, are presented. The PBS conditions exist within a wide range of amplitudes and energies, including negative energies relative to an initial condition. For each value of the magnetic field, there exists a precession frequency for which a curve of PBS energy passes through a zero value (in bifurcation point), and hence, in the vicinity of this point the PBS originate with the highest probability. The characteristics of PBS, including the time dependences of configuration, energy, and precession frequency, are considered. As a result of dissipation, the PBS transform into the macroscopic domains of a new phase.

Shielding the magnetic field from a transcranial stimulator using aluminium and iron: Simulation and experimental results

2015 ◽  
Author(s):  
Nuno Saraiva Santos ◽  
Sonia C. P. Sousa ◽  
Paulo Crespo ◽  
Pedro Cavaleiro Miranda ◽  
Ricardo Salvador ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Results ◽  
The Magnetic Field

Experiment Using a Magnetically Controlled Ferrofluid Flow in a Flatplate Laminar Flow System

2014 ◽  
Vol 896 ◽  
pp. 444-447
Author(s):  
Yi Hua Fan ◽  
Liao Yong Lou ◽  
Yu Ming Chen
Keyword(s):  
Magnetic Field ◽  
Laminar Flow ◽  
Magnetic Particles ◽  
Flow System ◽  
Experimental Results ◽  
Carrier Fluid ◽  
Field Coefficient ◽  
Coefficient Of Viscosity ◽  
Relationship Of ◽  
The Magnetic Field

The Phenomenon of a Magnetic Controlled Ferrofluid Flow in the Flat Plate Laminar Flow System is Discussed in this Paper. the Ferrofluid Flow is One Kind of Colloid Mixture, which is Composited by the Magnetic Particles, Carrier Fluid and Surfactant. its Motion is Followed the Fluid Dynamics and can be Controlled by a Magnetic Field. from the Theoretic Analysis and the Experimental Test, the Coefficient of Viscosity of the Ferrofluid Flow will be Affected by the Magnetic Field. Thus, an Experimental Rig is Built to Test the Influences of the Gap of the Plate and the Strength and Direction of the Magnetic Field for Several Ferrofluid Flows with Different Dividing Rates of Volume. Experimental Results Showed that the Coefficient of Viscosity of the Ferrofluid Flow is Almost Not Upgrading in a Wide Gap Condition by the Magnetic Field, but as the Gap is Smaller, the Coefficient of Viscosity will be Promoted Obviously. Furthermore, Enhancing the Magnetic Field, it will be Increase the Coefficient of Viscosity of the Ferrofluid Flow. from the Experimental Results, the Relationship of the Magnetic Field, Coefficient of Viscosity of Ferrofluid Flow and the Carrier Fluid can be Confirmed.

Analysis and Experimental Study on Magnetic Fluid Seal Mechanism

2011 ◽  
Vol 492 ◽  
pp. 273-276 ◽  
Author(s):  
Hai Na Zhang ◽  
De Cai Li
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Field Distribution ◽  
Magnetic Fluid ◽  
Magnetic Field Distribution ◽  
Gas Flows ◽  
Experimental Setup ◽  
Pressure Transmission ◽  
The Magnetic Field ◽  
The Way

The authors put forward a new design of experimental setup in order to study the mechanism of magnetic fluid seal, and used Ansys to simulate the magnetic field distribution in the setup, the results prove its rationality. The experiment to study the way of pressure transmission has been done on the experimental setup. The experimental conclusion shows that pressure transmission is based on the recoverability of the magnetic fluid seal. When pressure exceeds the ability of the seal stage, there is a leak path in the magnetic fluid, and then the gas flows to the next stage, after that, the leak path disappears. Pressure transmits from one seal stage to the next one in this way.

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