scholarly journals A Magneto-Active Elastomer Crawler with Peristaltic and Caterpillar Locomotion Patterns

Actuators ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 74
Author(s):  
Tsam Lung You ◽  
Hemma Philamore ◽  
Fumitoshi Matsuno
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
External Magnetic Field ◽  
Mathematical Models ◽  
Confined Spaces ◽  
Low Mass ◽  
Structural Simplicity

In this work we present a soft crawler fabricated using a magneto-active elastomer. The crawler is controlled by an external magnetic field to produce two locomotion patterns: peristaltic and caterpillar crawling. Due to its structural simplicity, low mass, wirelessly controlled actuation and compliant body the design of this crawler has the potential to address the key challenges faced by existing crawling robots. Experimental data were gathered to evaluate the performance of the crawler locomotion in a pipe. The results validated the mathematical models proposed to estimate the distance traveled by the crawler. The crawler shows potential for use in exploration of confined spaces.

scholarly journals High Frequency Magnetoimpedance of FeNi/Cu/FeNi Sensitive Elements with Different Geometries

2009 ◽  
Vol 152-153 ◽  
pp. 373-376 ◽  
Author(s):  
Stanislav O. Volchkov ◽  
Andrey V. Svalov ◽  
G.V. Kurlyandskaya
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
External Magnetic Field ◽  
Finite Elements ◽  
Magnetic Anisotropy ◽  
Constant Magnetic Field ◽  
High Frequency ◽  
Complex Impedance ◽  
Rf Sputtering ◽  
Frequency Range

In this work magnetoimpedance (MI) behaviour was studied experimentally for Fe19Ni81(175 nm)/Cu(350 nm)/Fe19Ni81(175 nm) sensitive elements deposited by rf-sputtering. A constant magnetic field was applied in plane of the sandwiches during deposition perpendicular to the Cu-lead in order to induce a magnetic anisotropy. Sandwiches with different width (w) of FeNi parts were obtained. The complex impedance was measured as a function of the external magnetic field for a frequency range of 1 MHz to 700 MHz for MI elements with different geometries. Some of MI experimental data are comparatively analysed with finite elements numerical calculations data. The obtained results can be useful for optimization of the design of miniaturized MI detectors.

On Electrical Conductivity Measurements of Molten Metals by Inductive Technique

2004 ◽  
Vol 126 (3) ◽  
pp. 468-470 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Mihai Dupac ◽  
Ruel A. Overfelt ◽  
Sorin G. Teodorescu
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Electrical Conductivity ◽  
Fluid Flow ◽  
External Magnetic Field ◽  
Electric Conductivity ◽  
Molten Metals ◽  
Conductivity Measurements ◽  
Permanent Magnetic Field ◽  
Rotating Liquid

In this paper, we propose a new relationship between the opposing mechanical torque and the electric conductivity of a rotating liquid specimen in a permanent external magnetic field of constant induction, which includes the effect of fluid flow. The proposed relationship was applied to describe the experimental data for a conductive specimens rotating in a permanent magnetic field.

Fluid Flow Effect in Electrical Conductivity Measurements of Molten Metals by Inductive Technique

2002 ◽  
Author(s):  
Sayavur I. Bakhtiyarov ◽  
Mihai Dupac ◽  
Ruel A. Overfelt ◽  
Sorin G. Teodorescu
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Electrical Conductivity ◽  
Fluid Flow ◽  
External Magnetic Field ◽  
Electric Conductivity ◽  
Molten Metals ◽  
Conductivity Measurements ◽  
Permanent Magnetic Field ◽  
Rotating Liquid

In this paper we propose a new relationship between the opposing mechanical torque and the electric conductivity of a rotating liquid specimen in a permanent external magnetic field of constant induction, which includes the effect of fluid flow. The proposed relationship was applied to describe the experimental data for a conductive specimen rotating in a permanent magnetic field.

Ferromagnetic Resonance On Metallic Glass Ribbons

2001 ◽  
Vol 674 ◽  
Author(s):  
M. Chipara ◽  
M. Toacsen ◽  
M. Sorescu
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
External Magnetic Field ◽  
Metallic Glass ◽  
Ferromagnetic Resonance ◽  
Metallic Glasses ◽  
Room Temperature ◽  
Resonance Condition ◽  
X Band ◽  
Resonance Data

ABSTRACTFerromagnetic resonance data on metallic glasses, at room temperature, in X band, are discussed. The spectra were decomposed into two Lorentzian lines and the angular dependence of their main parameters (line width and position) is fully analyzed. It is proved that the usual approaches are not able to describe accurately the experimental data. This behavior is ascribed to the misalignment of the magnetization with respect to the external magnetic field, and successfully tested by using a “relaxed” resonance condition that allows a small misalignment of the magnetization relative to the external magnetic field.

Biodegradation of Nanoparticles in a Body from Mössbauer and Magnetization Measurements

2012 ◽  
Vol 190 ◽  
pp. 725-728 ◽  
Author(s):  
Mikhail Chuev ◽  
Valery Cherepanov ◽  
Maxim P. Nikitin ◽  
Mikhail Polikarpov
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Magnetic Nanoparticles ◽  
External Magnetic Field ◽  
Chemical Transformation ◽  
Living Organism ◽  
Quantitative Information ◽  
Spectral Shape ◽  
Magnetization Curves ◽  
Field Dependent

In order to extract a quantitative information about characteristics of the magnetic nanoparticles injected into a living organism one has to define a model of the magnetic dynamics in order to fit self-consistently the whole set of the experimental data, particularly, the evolution of Mössbauer spectral shape with temperature and external magnetic field as well as the magnetization curves. We have developed such a model and performed such an analysis of the temperature-and magnetic field-dependent spectra and magnetization curves of nanoparticles injected into a mice. This allowed us to reliably evaluate changes in the residual nanoparticles characteristics and their chemical transformation to paramagnetic ferritin-like forms in different mouses organs as a function of time after injection of nanoparticles. Actually, the approach allows one to quantitatively characterize biodegradation and biotransformation of magnetic nanoparticles injected into a body.

ELECTROMECHANICAL COEFFICIENTS OF MAGNETOELECTRIC PZT–CoFe2O4 COMPOSITE

2000 ◽  
Vol 14 (17n18) ◽  
pp. 663-674 ◽  
Author(s):  
K. SRINIVAS ◽  
G. PRASAD ◽  
T. BHIMASANKARAM ◽  
S. V. SURYANARAYANA
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
External Magnetic Field ◽  
Lead Zirconate Titanate ◽  
Electromechanical Coupling ◽  
Electromagnetic Coupling ◽  
Lead Zirconate ◽  
Electromechanical Coupling Coefficient ◽  
Sum Rule ◽  
Magnetoelectric Composite

The magnetoelectric property of composite materials consisting of piezoelectric and piezomagnetic constituents are of interest since the stresses induced in them on application of an external magnetic field are converted into electrical signals. The electrical output is primarily due to electromagnetic coupling between the two participating phases. The present paper deals with the evaluation of the electromechanical coupling in the magnetoelectric composite consisting of 50% lead zirconate titanate (Pb0.96Sr0.04Ti0.47Zr0.53O3) and 50% CoFe2O4, the composition having maximum magnetoelectric conversion efficiency. A sum rule is proposed to calculate the electromechanical coupling coefficient and the results are correlated with the experimental data.

DYNAMICAL STRUCTURE FACTOR FOR s-f MODEL WITH AN EXTERNAL MAGNETIC FIELD BELOW Tc

1993 ◽  
Vol 07 (14) ◽  
pp. 2685-2696
Author(s):  
J.M. WESSELINOWA ◽  
M.G. YORDANOVA
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
External Magnetic Field ◽  
Structure Factor ◽  
High Field ◽  
Function Technique ◽  
Dynamical Structure ◽  
Dynamical Structure Factor ◽  
Low Field ◽  
Peak Broadening

The dynamical structure factor for the s-f model with an applied magnetic field is investigated using a Green function technique. The peak broadening is remarkable in a low field whereas in a high field the peak broadening mechanism is almost suppressed. This is in agreement with the experimental data for the europium chalcogenides EuS and EuSe.

NUMERICAL ANALYSIS OF HYSTERETIC LOSSES IN BSCCO/AG TAPES DUE TO TRANSPORT CURRENT AND EXTERNAL MAGNETIC FIELD

2000 ◽  
Vol 14 (25n27) ◽  
pp. 3165-3170 ◽  
Author(s):  
P. LA CASCIA ◽  
L. BIGONI ◽  
E. CEREDA ◽  
F. NEGRINI ◽  
V. OTTOBONI ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
External Magnetic Field ◽  
Time Dependence ◽  
Transport Current ◽  
Magnetic Vector Potential ◽  
Two Dimensional ◽  
The Finite Element Method ◽  
Magnetic Vector ◽  
Transport Losses

A model to calculate hysteretic and transport losses in multifilamentary BSCCO/Ag tapes is described. The model considers a rectilinear infinitely long tape and is based on the two-dimensional Poisson equation for the magnetic vector potential. The equation is numerically solved by means of the finite element method. The contribution of both transport current and external magnetic field with any orientation with respect to the normal to the wide side of the tape is taken into account. A sinusoidal time dependence of the transport current and of the external magnetic field is considered but the model can analyze any time dependence of both quantities. A comparison between the calculated and experimental data is reported and discussed.

Numerical Simulations of Fluid Flow During Electromagnetic Stirring of Metals

2001 ◽  
Author(s):  
Sorin G. Teodorescu ◽  
Mihai Dupac ◽  
Sayavur I. Bakhtiyarov ◽  
Ruel A. Overfelt
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Fluid Flow ◽  
External Magnetic Field ◽  
Numerical Simulations ◽  
Electric Conductivity ◽  
Electromagnetic Stirring ◽  
Metal Sample ◽  
Rotating Liquid ◽  
Better Than

Abstract In this paper we propose a new relationship between the opposing mechanical torque and the electric conductivity of a rotating liquid specimen in a permanent external magnetic field of constant induction. It is shown that the proposed relationship describes the experimental data for a rotating specimen better than Braunbeck formula derived under the assumption that a magnetic field rotates around a stationary metal sample.

Isothermal Dehydriding Kinetics of Mg2NiH4 Prepared under an External Magnetic Field

2013 ◽  
Vol 785-786 ◽  
pp. 638-641
Author(s):  
Jing Liu
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Solid Solution ◽  
External Magnetic Field ◽  
Magnetic Intensity ◽  
Hydrogen Atoms ◽  
Kinetics Of ◽  
Rate Controlling Step ◽  
Diffusion Of Hydrogen ◽  
Good Agreement

The Mg2NiH4hydrogen storage metal hydride was prepared by hydriding combustion synthesis under an external magnetic field. The dehydriding kinetics of the hydrides was measured under isotherm condition. The kinetics mechanism of Mg2NiH4materials was analyzed by model. The calculated results show that the theoretical calculation and the experimental data can reach a good agreement. The rate-controlling step is the diffusion of hydrogen atoms in the solid solution. The dehydriding activation energies of the sample synthesized under the optimized magnetic intensity of 6 T is 104 kJ/mol H2.

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