Planar arrangement of permanent magnets in design of a magneto-solid damper by finite element method

Amjadian, Mohsen; Agrawal, Anil K.

doi:10.1177/1045389x20905968

Cited by 8 publications

(4 citation statements)

References 57 publications

(98 reference statements)

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“…Research on permanent magnet eddy current dampers has made preliminary progress in structural design [5,6] and resistance characteristic analysis [7,8]. With great application potential, it is expected to fundamentally address the limitations of the traditional hydraulic retreat mechanism, such as poor sealing performance and complicated maintenance processes.…”

Section: Introductionmentioning

confidence: 99%

Thermal Demagnetization Characteristics of NdFeB Used in Eddy Current Dampers

Yang,

Li,

Zhang

2024

IEEE Access

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With continuously improving NdFeB magnetic properties, eddy current dampers using NdFeB materials as energy sources can be used in places with high energy consumption densities. However, the magnetic properties of NdFeB are greatly threatened by the increase in temperature, and the demagnetization process of NdFeB remains unclear. To comprehend demagnetization due to temperature increases in the working environment, this study reproduces the microscopic demagnetization process of NdFeB under high temperatures using the micromagnetic numerical simulation method. The demagnetization mechanism of NdFeB at different temperatures is analyzed using micromagnetic calculations, and the hysteresis phenomenon of NdFeB is explained accordingly. To quantify the demagnetization phenomenon of NdFeB in engineering practice, it is crucial to mathematically express its demagnetization behavior at different temperatures. We used the Jiles-Atherton (J-A) model, frequently used in ferromagnetic materials, to describe the demagnetization process. Next, a dynamic hysteresis experiment of NdFeB is conducted to validate the accuracy of the J-A model in expressing the magnetic properties. Finally, considering the artillery launch as a typical engineering case, the demagnetization and resistance drop calculation of the eddy current damper due to the heating of the permanent magnet during the launch process is performed. Results imply that under the worst working conditions, the maximum demagnetization amount of NdFeB is 0.351 T, and the maximum recoil displacement of the damper is 1,108 mm, theoretically supporting the design of the eddy current damper.

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Section: Introductionmentioning

confidence: 99%

Thermal Demagnetization Characteristics of NdFeB Used in Eddy Current Dampers

Yang,

Li,

Zhang

2024

IEEE Access

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“…Magnetic attraction forces are used to generate the contact pressure at the interface of a shape memory structure that is composed of two H-MAEs. The use of magnetic forces in order to establish mechanical contacts has been explored in the context of vibration damping by friction [25,26] with the goal to establish a moderate and well distributed contact pressure. In the present work, the stable state is maintained by adhesion in the contact interface.…”

Section: Introductionmentioning

confidence: 99%

Magnetofriction—a new concept for shape memory composites

Hermann¹,

Muniz²,

Ouisse³

et al. 2023

Smart Mater. Struct.

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This paper introduces a new concept for shape memory based on elastic forces and magnetically induced friction forces in composite materials consisting of magnetoactive elastomers (MAEs). Magnetic attraction forces between two MAEs generate a contact pressure at their interface and the friction allows to maintain stable deformed shapes of the so-called Magnetofriction Shape Memory Polymers (MF-SMPs). When the contact is loosened, the friction forces vanish and the elastic forces in each part of the assembly bring the parts back into their initial state where the contact can be established once again. The shape memory effect is studied in three-point bending tests with two stacked MAEs. The global force-displacement relations reveal a hysteretic behavior due to local residual displacements after the test are observed by the help of digital image correlation (DIC). The test structure stores up to 25% of the applied displacement. The local contact state (sliding or sticking) is evaluated in different regions of the MF-SMP which gives an insight into the shape memory mechanism magnetofriction. Two methods for the shape-recovery of the MF-SMP by elastic forces in the MAEs are proposed, a manual separation and an air flow at the interface of the MF-SMP, and a comparison of magnetofriction to other shape memory mechanisms is performed.

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“…EMEHs are more reliable due to their small mechanical damping, implying that they need fewer mechanical contacts to generate electrical power [1,4]. They have a relatively simple electrical energy generation mechanism which is based on Faraday's law of induction for moving conductors [5][6][7]. This makes them a viable option for harvesting electrical power from traffic-induced vibrations of highway bridges.…”

Section: Introductionmentioning

confidence: 99%

Development of An Analytical Method for Design of Electromagnetic Energy Harvesters with Planar Magnetic Arrays

2022

Self Cite

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In this paper, an analytical method is proposed for the modeling of electromagnetic energy harvesters (EMEH) with planar arrays of permanent magnets. It is shown that the proposed method can accurately simulate the generation of electrical power in an EMEH from the vibration of a bridge subjected to traffic loading. The EMEH consists of two parallel planar arrays of 5 by 5 small cubic permanent magnets (PMs) that are firmly attached to a solid aluminum base plate, and a thick rectangular copper coil that is connected to the base plate through a set of four springs. The coil can move relative to the two magnetic arrays when the base plate is subjected to an external excitation caused by the vehicles passing over the bridge. The proposed analytical model is used to formulize the magnetic interaction between the magnetic arrays and the moving coil and the electromechanical coupling between both the electrical and mechanical domains of the EMEH. A finite element model is developed to verify the accuracy of the proposed analytical model to compute the magnetic force acting on the coil. The analytical model is then used to conduct a parametric study on the magnetic arrays to optimize the arrangement of the PM poles, thereby maximize the electrical power outputted from the EMEH. The results of parametric analysis using the proposed analytical method show that the EMEH, under the resonant condition, can deliver an average electrical power as large as 500 mW when the PM poles are arranged alternately along the direction of vibration for a peak base acceleration of 0.1 g. A proof-of-concept prototype of the EMEH is fabricated to test its performance for a given arrangement of PMs subjected to vibration in both the lab and field environments.

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Planar arrangement of permanent magnets in design of a magneto-solid damper by finite element method

Cited by 8 publications

References 57 publications

Thermal Demagnetization Characteristics of NdFeB Used in Eddy Current Dampers

Thermal Demagnetization Characteristics of NdFeB Used in Eddy Current Dampers

Magnetofriction—a new concept for shape memory composites

Development of An Analytical Method for Design of Electromagnetic Energy Harvesters with Planar Magnetic Arrays

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