A nonlinear dynamic hysteresis model with magnetic-thermal-stress-fluid coupling effect for hydraulically amplified magnetostrictive actuator

Li, Yuesong

doi:10.1063/5.0173416

Cited by 2 publications

References 27 publications

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A nonlinear dynamic hysteresis model with magnetic–prestress–thermal coupling effect and dynamic electromagnetic losses of a giant magnetostrictive actuator

2024

AIP Advances

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Compared with traditional actuators, the giant magnetostrictive actuator has the merits of fast response, high accuracy, and high reliability and has been widely applied. However, its performance is affected by the electromagnetic loss and the temperature, prestress, and magnetic coupling effect. In order to accurately analyze its performance, it is necessary to establish a nonlinear dynamic model including the electromagnetic loss and the magnetic–prestress–thermal coupling effect. First, based on the field separation approach, the magnetic fields generated by the eddy current loss and the anomalous loss are obtained and added to the Jiles–Atherton model. Second, the magnetostrictive model is given with the magnetic–prestress–thermal coupling effect. Finally, assuming the transmission of the giant magnetostrictive actuator as a mass–spring–damper system, a nonlinear dynamic hysteresis model with magnetic–prestress–thermal coupling effect and dynamic electromagnetic losses of a giant magnetostrictive actuator is developed. Based on this model, the output displacement curves of the giant magnetostrictive actuators under different driving currents and frequencies are given. The comparison with the experimental results shows that this model agrees well with the experiment.

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A nonlinear dynamic hysteresis model with magnetic–prestress–thermal coupling effect and dynamic electromagnetic losses of a giant magnetostrictive actuator

2024

AIP Advances

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Improvement of the power generation efficiency of magnetostrictive vibration generators using multiple magnetic circuits

Zhang,

Ueno,

Kita

2024

Behavior and Mechanics of Multifunctional Materials XVIII

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Vibration power generation harnesses weak environmental vibrations and converts them into electrical energy. In this study, a vibration power generator based on a magnetostrictive material (Fe-Ga) was investigated. The generator was designed with a cantilever beam structure, offering advantages in simplicity, robustness, and high-power generation capacity compared with piezoelectric systems. The change in magnetic flux within the coil is attributed to two factors: the change in the magnetoresistance of the magnetostrictive material owing to applied stress, and the variation in air-gap reluctance caused by fluctuations in the air-gap length. In our previous research, we focused on air-gap magnetoresistance variation and proposed a vibro-generator with a narrower air gap. Modifying the air-gap structure increased the generator's air-gap magnetoresistance variation at the same amplitude, enhancing power generation. In this study, we introduced an auxiliary magnetic circuit to a narrow-gap-type vibration power generator. The main and auxiliary magnetic circuits had opposing flux directions and trends, which maximized the change in flux in the coil. Based on the study's experimental results, the maximum output power generated by the multiple magnetic circuit vibro-generator was 149% and 46.3% higher than that of conventional vibro-generators and narrow-gap-type vibration generators, respectively. The multiple magneticcircuit structure can enhance the power generation efficiency of the vibration generator, thereby increasing the application potential of the equipment.

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A nonlinear dynamic hysteresis model with magnetic-thermal-stress-fluid coupling effect for hydraulically amplified magnetostrictive actuator

Cited by 2 publications

References 27 publications

A nonlinear dynamic hysteresis model with magnetic–prestress–thermal coupling effect and dynamic electromagnetic losses of a giant magnetostrictive actuator

A nonlinear dynamic hysteresis model with magnetic–prestress–thermal coupling effect and dynamic electromagnetic losses of a giant magnetostrictive actuator

Improvement of the power generation efficiency of magnetostrictive vibration generators using multiple magnetic circuits

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