Dynamic discrete energy-averaged model for magnetostrictive materials

Deng, Zhangxian

doi:10.1016/j.jmmm.2017.06.042

Cited by 5 publications

(6 citation statements)

References 33 publications

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“…The value of η shunt initially increases with respect to the excitation frequency. Eddy currents induce magnetic field diffusion in a magnetostrictive rod, thereby reducing magnetic flux density variation and, thus, the voltage across the shunt [18,31]. The loss factor η shunt starts to decline around 750 Hz, since the resistant shunt is tuned to peak at 750 Hz.…”

Section: Resultsmentioning

confidence: 99%

“…This corresponds to a relative stiffness variation of K = 6.7%. Compared with the device based on laminated Galfenol (figure 4(b)), the reduction of K is due to the magnetic field diffusion in the solid Galfenol device that prevents magnetic domain rotation and, thus, reduces magnetostriction [18,31]. The shunted device based on solid Galfenol exhibits a relatively low stiffness even without the laminated Galfenol rod's soft adhesive layers.…”

Section: Capacitivementioning

confidence: 97%

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Shunted magnetostrictive devices in vibration control

Deng¹,

Scheidler²,

Asnani³

et al. 2020

Smart Mater. Struct.

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Structural vibrations in rotating machinery may lead to imprecise motion control, excessive noise, or even structural damage. Magnetostrictive materials can dissipate unwanted vibrations via hysteresis, eddy currents, and joule heating while exhibiting an electrically-tunable elastic modulus. Harnessing this feature, this article presents a shunted magnetostrictive device that includes an iron-gallium (Galfenol) rod, a permanent magnet array, a flux return path, and shunt circuits. The stiffness tunability and damping of this passive device are measured under a 750 Hz sinusoidal axial compression for resistive, capacitive, and inductive shunt circuits. The effect of eddy currents stiffness and damping is investigated for the first time by comparing results from laminated and solid Galfenol rods. Solid Galfenol produces larger eddy current-based damping, while laminated Galfenol enables larger stiffness variation and total damping. This device demonstrates a power density of 19.83 mW cm−3 for vibration energy harvesting. The frequency-dependent behavior of the shunted device is tested from 5 Hz to 1 kHz for selected electrical loads.

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Section: Resultsmentioning

confidence: 99%

Section: Capacitivementioning

confidence: 97%

Shunted magnetostrictive devices in vibration control

Deng¹,

Scheidler²,

Asnani³

et al. 2020

Smart Mater. Struct.

Self Cite

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“…Notable damping coefficients are available by dissipating the electrical energy on a shunt circuit. The Villari effect can also induce significant eddy current loss in electrically-conductive magnetostrictive materials [27,28]. The stress-induced eddy currents provide a compact damping mechanism that converts mechanical energy to Joule heat without introducing bulky shunt circuits.…”

Section: Villari Effectmentioning

confidence: 99%

“…The other energy dissipation mechanism associated with magnetostrictive materials is the stress-induced eddy currents. Deng [27] and Scheidler and Dapino [28] have developed analytical constitutive models describing the eddy current loss in magnetostrictive materials. Scheidleret al [82] experimentally characterized the eddy current loss up to 1kHz by comparing the strain versus stress curves measured from a solid and a laminated Galfenol sample (Φ6.35 mm).…”

Section: Passive Controlmentioning

confidence: 99%

“…To The other energy dissipation mechanism associated with magnetostrictive materials is the stress-induced eddy currents. Deng [27] and Scheidler and Dapino [28] The stress-induced eddy current loss depends on the device's geometry. To create significant damping for arbitrary geometries, recent studies have incorporated a shunted circuit with the magnetostrictive materials, as shown in figure 28.…”

Section: Passive Controlmentioning

confidence: 99%

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Review of magnetostrictive materials for structural vibration control

Deng

Dapino

2018

Smart Mater. Struct.

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Excessive vibrations in civil and mechanical systems can cause structural damage or detrimental noise. Structural vibrations can be mitigated either by attenuating energy from vibration sources or isolating external disturbance from target structures. Magnetostrictive materials coupling mechanical and magnetic energies have provided innovative solutions to vibration control challenges. Depending on the system's tunability and power consumption, the existing vibration control strategies are categorized into active, passive, and semi-active types. This article first summarizes the unique properties of magnetostrictive materials that lead to compact and reliable vibration control strategies. Several magnetostrictive vibration control mechanisms together with their performance are then studied using lumped parameter models. Finally, this article reviews the current state of vibration control applications utilizing magnetostrictive materials, especially Terfenol-D and Galfenol.

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