Magnetoelastic Energy Harvesting: Modeling and Experiments

Davino, D.; Giustiniani, Alessandro; Visone, C.

doi:10.5772/50892

Cited by 12 publications

(19 citation statements)

References 51 publications

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“…At this point, it is worth noting that the magnetic curves are quite similar each other with respect to the applied stress. This property, named “ self-similarity ” [26,33,34], has been used to help the material modeling, as shown in the following section. Figure 2b shows the magnetic flux density variation in SA Galfenol, when constants magnetic field and cyclic compressive stress are applied.…”

Section: Experimental Setup and Static Magneto-mechanical Charactementioning

confidence: 99%

Modeling and Characterization of a Kinetic Energy Harvesting Device Based on Galfenol

Clemente

Davino

2019

Materials

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The proposal of Energy Harvesting (EH) techniques and devices has experienced a significant growth over the last years, because of the spread of low power electronic devices. Small ambient energy quantities can be recovered through EH and exploited to power Wireless Sensor Networks (WSN) used, for example, for the Structural Health Monitoring (SHM) of bridges or viaducts. For this purpose, research on EH devices based on magnetostrictive materials has significantly grown in the last years. However, these devices comprise different parts, such as a mechanical system, magnetic circuit and electrical connections, which are coupled together. Then, a method able to reproduce the performance may be a handy tool. This paper presents a nonlinear equivalent circuit of a harvester, based on multiple rods of Galfenol, which can be solved with standard circuit simulator. The circuital parameters are identified with measurements both on one rod and on the whole device. The validation of the circuit and the analysis of the power conversion performance of the device have been conducted with different working conditions (force profile, typology of permanent magnets, resistive electrical load).

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Section: Experimental Setup and Static Magneto-mechanical Charactementioning

confidence: 99%

Modeling and Characterization of a Kinetic Energy Harvesting Device Based on Galfenol

Clemente

Davino

2019

Materials

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“…This material is an Fe-Ga alloy [19], in which the Ga addition has been studied up to about 40% with the purpose of studying its magnetostrictive behavior. In [20][21][22][23][24], it can be observed that the magnetization saturation can be reached for applied magnetic fields about 0.2 4 KOe, which can be considered as low ones in comparisons with other magnetic materials [25]. Then, Galfenol can be described as a material with low hysteresis [26].…”

Section: Introductionmentioning

confidence: 99%

“…Then, Galfenol can be described as a material with low hysteresis [26]. This material has found several applications like energy harvesting [21] and micro-actuators [26,27]. The authors of [26] and [28] present critical review and detailed study of Galfenol.…”

Section: Introductionmentioning

confidence: 99%

The influence of Galfenol constituent in the improvement of the magnetoelectric coupling effect for composite materials

Espinosa‐Almeyda

Camacho‐Montes

Nava-Gómez

et al. 2016

Math Methods in App Sciences

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Communicated by I. SevostianovGalfenol offers potential opportunities to build composite materials with higher magnetoelectric (ME) coupling coefficients. This work is mainly focused on exploring the ME coupling in composites made with Galfenol. A revision of effective properties estimation is based on the prediction obtained through an implementation of the asymptotic homogenization method for magneto-electro-elastic composites considering two types of composites: laminated and fiber reinforced. As constituents, Barium Titanate is considered as the piezoelectric phase and Galfenol as the magnetostrictive one. For the sake of comparison, Terfenol-D and Cobalt Ferrite are also considered. The herein obtained ME coefficients are higher than most ones reported in the literature when comparison is possible. In the literature, two types of ME coefficients can be found: one is the voltage ME, reported in V/cmOe, and the other one is the coupling ME reported in Ns/VC. Herein, we focused on the connection between these coefficients in order to facilitate the application of the coupling ME calculated by asymptotic homogenization method on the experimental measured voltage ME coefficient.Also for a quasi-static approximation, the electric E and magnetic H fields and his relations with their respective potentials and are known by means of the quasi-static Maxwell's equations:

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“…However, all smart materials demonstrate a strongly nonlinear constitutive law. Results from piezoelectric energy harvesters [13,14,15,16,17] and preliminary results from magnetostrictive energy harvesters [18] show that nonlinearities in the material characteristic need to be accounted for in order to maximize, or significantly increase, the energy output of these devices. From a philosophical point of view, linear models displaying Onsager reciprocity have been criticized because they only model reversible processes in thermodynamic equilibrium [19] (Chap.…”

Section: Introductionmentioning

confidence: 99%

“…Third, magnetostrictive materials show a typical butterfly curve with saturation in the strain versus magnetic field characteristic, which means that a biasing magnetic field and correct prestressing need to be applied to extract maximum energy if the harvester is operating in an open-loop fashion 4 . In other words, the magnetic bias determines how much energy is available for harvesting [18]. Therefore, we consider maximization of harvestable energy, for a given mechanical load, with respect to controllable bias field while also taking into account the losses due to lead resistance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of an operator-differential model for magnetostrictive energy harvesting

Davino

Krejčı́

Pimenov

et al. 2016

Communications in Nonlinear Science and Numerical Simulation

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We present a model of, and analysis of an optimization problem for, a magnetostrictive harvesting device which converts mechanical energy of the repetitive process such as vibrations of the smart material to electrical energy that is then supplied to an electric load. The model combines a lumped differential equation for a simple electronic circuit with an operator model for the complex constitutive law of the magnetostrictive material. The operator based on the formalism of the phenomenological Preisach model describes nonlinear saturation effects and hysteresis losses typical of magnetostrictive materials in a thermodynamically consistent fashion. We prove well-posedness of the full operator-differential system and establish global asymptotic stability of the periodic regime under periodic mechanical forcing that represents mechanical vibrations due to varying environmental conditions. Then we show the existence of an optimal solution for the problem of maximization of the output power with respect to a set of controllable parameters (for the periodically forced system). Analytical results are illustrated with numerical examples of an optimal solution.

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Magnetoelastic Energy Harvesting: Modeling and Experiments

Cited by 12 publications

References 51 publications

Modeling and Characterization of a Kinetic Energy Harvesting Device Based on Galfenol

Modeling and Characterization of a Kinetic Energy Harvesting Device Based on Galfenol

The influence of Galfenol constituent in the improvement of the magnetoelectric coupling effect for composite materials

Analysis of an operator-differential model for magnetostrictive energy harvesting

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