Based on the Jiles-Atherton model and transducer's structural dynamics principle, magnetoelastic dynamic strain of giant magnetostrictive transducer is founded. This takes into account eddy current losses variety stress. Simulation results are in a good agreement with experimental ones. indicates that can characterize magnetization intensity behavior at different frequency. The proposed suitable to describe relation between applied field output vibration wide range exciting frequency

According to the hysteresis characteristics of giant magnetostrictive actuator (MA), a dynamic recurrent neural network (DRNN) is constructed as inverse model MA, and an on-line compensation control strategy combining DRNN compensator proportional derivative (PD) controller used for precision position tracking MA. Simulation results validate excellent performances proposed strategy.

Based on the Armstrong model and established electromechanical of a Galfenol cantilever energy harvester, nonlinear dynamic is proposed to describe mechanical-magneto-electro coupled characteristics device. Comparisons between experimental calculated results show that can provide reasonable qualitative indication data trends, predict effects acceleration excitation, load resistance, bias magnetic field output performance device, thus has very strong practicability.

This paper proposes a distributed parameter equivalent circuit model of magnetostrictive energy harvester, where the mechanical parameters and mechanical-electro coupled terms are represented by electronic components. Based on model, harvester system with any extraction (EEC) can be modeled in simulator for system-level evaluation design. Comparisons between measured calculated results show that proposed provide reasonable data at low acceleration levels, support physical understanding...

A system-level electromagnetic-mechanical-thermal multifield coupling model of a giant magnetostrictive transducer is proposed based on the thermodynamic theory, Jiles-Atherton model, energy balance principle, and structural dynamics principle system. The includes terms takes dynamic losses into account. parameters can be easily determined by measurable experiments. According to relation between magnetic field output strain was calculated using numerical algorithm. computed results are in...

The output characteristic model of a magnetostrictive cantilever-like tactile sensor has been founded based on the inverse-magnetostrictive effect, flexure mode, and Jiles-Atherton model. designed an voltage is analyzed under conditions bias magnetic field, contact pressure deflection cantilever beam. experiment performed to determine relation among induced voltage, pressure. It found that peak increases with increasing field 4.8kA/m. experimental result agrees well theoretical one it means...

Based on the established equivalent circuit model of a magnetostrictive vibration generator, low ac voltage and power produced by generator under acceleration are calculated. Comparisons between calculated measured results show that can provide reasonable data trends different loads. To boost to high dc required electronic devices in consumption, two energy extraction circuits (EECs) (i.e., proportion integration-based EEC an improved EEC) studied. The corresponding harvesting systems, which...

To improve low-frequency broadband performances of a traditional cantilever energy harvester (TCEH), nonlinear CEH (NCEH) with elastic magnifier (EM) (NCEH + EM) is studied. Based on the constitutive equations variable piezomagnetic coefficient, Faraday law, dynamic equilibrium, and harmonic balance theories, two-degree-of-freedom lumped parameter coupled model NCEH EM established frequency analytical expressions are derived. Comparisons between calculated measured results show that can...

Galfenol traditional cantilever energy harvesters (TCEHs) have bigger electrical output only at resonance and exhibit nonlinear mechanical-magnetic-electric coupled (NMMEC) behaviors. To increase low-frequency broadband performances of a TCEH, an improved CEH (ICEH) with magnetic repulsive force is studied. Based on the dipole model, model material, Faraday law dynamic principle, lumped parameter NMMEC devices established. Comparisons between calculated measured results show that proposed...

A mechanical-magnetic-electro bidirectional coupled dynamic model of a composite cantilever with magnetostrictive shunt damper is established, and the system's transfer functions key impedance impact factor are derived. For vibration damping, H2 optimization criterion Nelder-Mead search method used to obtain optimal parameters three circuits: resistance (RS), capacitance (CS), resistance-CS (RCS). Comparisons between calculated measured results show that proposed can accurately describe...

Based on the effective magnetic-field expression, constitutive equations with eddy currents, hysteresis model, and electromechanical coupled a dynamic mechanical-magnetic-electro bidirectional (MMEBC) model of vibration system Galfenol damper is established, system's transmissibility key frequency-dependent complex stiffness are derived. Comparisons between calculated measured results show that proposed can accurately describe minor-loop curves rod around bias point, provide reasonable data...

The stress-driven Terfernol-D energy harvester exhibits the nonlinear mechanical-magnetic-electric coupled (MMEC) behaviors and eddy current effects. To analyze design device, it is necessary to establish an accurate model of device. Based on effective magnetic field expression, constitutive equations with currents variable coefficients, dynamic equations, a MMEC for device founded. Comparisons between measured calculated results show that can describe curves magnetization versus stress...

In this paper, we fabricated novel magnetostrictive composites by embedding 110-oriented Tb-Dy-Ho-Fe fibers in an epoxy matrix. The and magnetic properties (magnetostriction, magnetization, piezomagnetic coefficient relative permeability) of the proposed were measured, analyzed, compared to those TbSUB0.29/SUBDySUB0.48/SUBHoSUB0.23/SUBFeSUB1.9/SUB alloy TbSUB0.3/SUBDySUB0.7/SUBFe₂ continuous-fiber/epoxy composites. have a saturation magnetostriction (λSUBs/SUB) 840 ppm magnetization...

A dynamic nonlinear model with eddy current effect has been developed to predict the responses of output current, induced voltage, electrical power, and displacement a Galfenol energy harvester subjected simultaneously stress bias magnetic field. This is obtained by constitutive equations effect, established electromechanical Armstrong model. The calculated induction curves polycrystalline are compared measured curves. effects varied operating conditions on performance predicated analyzed.

The phase relationship of Tb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.26</sub> Dy xmlns:xlink="http://www.w3.org/1999/xlink">0.49</sub> Ho xmlns:xlink="http://www.w3.org/1999/xlink">0.25</sub> Fe xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> (1.6 ≤ × 2.4) alloys in the Tb-Dy-Ho-Fe system was determined by using optical microscopy, X-ray diffraction, and differential thermal analysis. vertical section consists two single-phase...

Abstract The isothermal section at 650°C and the vertical Fe-(Ga 0.75 Al 0.25 ) of Fe-rich portion in Fe – Ga ternary system were determined using optical microscopy, scanning electron energy dispersion X-ray spectroscopy, diffraction differential thermal analysis. consists 4 single-phase regions: A2, B2, D0 3 , 19 two-phase A2 + B2 . No fcc L1 2 phase region occurs portion. three-phase

The microstructure and magnetoelasticity of melt-spun Sm/sub 1-x/Pr/sub x/Fe/sub 2/ 0.9/Pr/sub 0.1/(Fe/sub 1-y/B/sub y/)/sub alloys have been investigated using X-ray diffraction, transmission electron microscopy, three-terminal capacitance standard strain gauge techniques. is a mixture (Sm,Pr)Fe/sub 2//(Sm,Pr)(Fe,B)/sub crystalline amorphous phases. amount phase with increasing Pr or B content. 0.8/B/sub 0.2/)/sub almost entirely phase. magnetostriction remains unchanged when x<0.1 but...