ssPeristaltic activity in an asymmetric inclined channel with inertial forces under the inducement of magnetic field: Finite Element Method

The stepped magnetofluid seal is an effective method for improving the pressure ability of ordinary magnetofluid seals (OMS) with large clearance. At present, the research on stepped magnetofluid seal with less than 0.4 mm small clearance has not been carried out yet. The equivalent magnetic circuit design of converging stepped magnetofluid seal (CSMS) with small clearance has been carried out and verified by magnetic field finite element method based on the CSMS theory and magnetic circuit theory. The effects of the width of the axial seal position, the height of the radial seal position, the number of the pole tooth in the axial seal position, and the number of the pole tooth in the radial seal position on the theoretical pressure ability of the CSMS are investigated by numerical simulation. The calculation results are analyzed and discussed. The results show that the magnetic flux leakage at the junction of the permanent magnet and pole piece causes the higher pressure ability of the CSMS structure designed by the equivalent magnetic circuit method than that calculated by the magnetic field finite element method. When the width of the axial seal position is greater than the height of the radial seal position and the number of pole teeth in the axial seal position is less than the number of pole teeth in the radial seal position, the CSMS has the best effect. Compared with OMS with small clearance, CSMS has greater advantages.

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Design and fabrication of a microelectromechanical system resonator based on two orthogonal silicon beams with integrated mirror for monitoring in-plane magnetic field

Advances in Mechanical Engineering ◽

10.1177/1687814019853683 ◽

2019 ◽

Vol 11 (7) ◽

pp. 168781401985368 ◽

Cited By ~ 1

Author(s):

Jesús Acevedo-Mijangos ◽

Antonio Ramírez-Treviño ◽

Daniel A May-Arrioja ◽

Patrick LiKamWa ◽

Héctor Vázquez-Leal ◽

...

Keyword(s):

Magnetic Field ◽

Finite Element Method ◽

Finite Element ◽

Resonant Frequency ◽

Microelectromechanical Systems ◽

Analytical Models ◽

Complex Signal ◽

Bending Vibration ◽

Element Method ◽

Silicon Beams

We present a resonant magnetic field sensor based on microelectromechanical systems technology with optical detection. The sensor has single resonator composed of two orthogonal silicon beams (600 µm × 26 µm × 2 µm) with an integrated mirror (50 µm × 34 µm × 0.11 µm) and gold tracks (16 µm × 0.11 µm). The resonator is fabricated using silicon-on-insulator wafer in a simple bulk micromachining process. The sensor has easy performance that allows its oscillation in the first bending vibration mode through the Lorentz force for monitoring in-plane magnetic field. Analytical models are developed to predict first bending resonant frequency, quality factor, and displacements of the resonator. In addition, finite element method models are obtained to estimate the resonator performance. The results of the proposed analytical models agree well with those of the finite element method models. For alternating electrical current of 30 mA, the sensor has a theoretical linear response, a first bending resonant frequency of 43.8 kHz, a sensitivity of 46.1 µm T−1, and a power consumption close to 54 mW. The experimental resonant frequency of the sensor is 53 kHz. The proposed sensor could be used for monitoring in-plane magnetic field without a complex signal conditioning system.

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Finite-Element Analysis of Magnetoelastic Buckling of Ferromagnetic Beam Plate

Journal of Applied Mechanics ◽

10.1115/1.3153672 ◽

1980 ◽

Vol 47 (2) ◽

pp. 377-382 ◽

Cited By ~ 47

Author(s):

K. Miya ◽

T. Takagi ◽

Y. Ando

Keyword(s):

Magnetic Field ◽

Finite Element Method ◽

Finite Element Analysis ◽

Finite Element ◽

Experimental Results ◽

The Finite Element Method ◽

Magnetic Torque ◽

Element Analysis ◽

Element Method

Some corrections have been made hitherto to explain the great discrepancy between experimental and theoretical values of the magnetoelastic buckling field of a ferromagnetic beam plate. To solve this problem, the finite-element method was applied. A magnetic field and buckling equations of the ferromagnetic beam plate finite in size were solved numerically assuming that the magnetic torque is proportional to the rotation of the plate and by using a disturbed magnetic torque deduced by Moon. Numerical and experimental results agree well with each other within 25 percent.

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