Noncontact gravity compensator with magnetic fluid seals

Hasegawa, Noriyuki; Yoshioka, Hayato; Shinno, Hidenori

doi:10.1299/jamdsm.2016jamdsm0078

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…A magnetic fluid seal is a new sealing method that is often applied to important parts that have strict requirements on sealing performance (Hasegawa et al, 2016;Mitamura and Durst, 2017), such as movable parts of spacesuits, X-ray diffractometer, radar waveguide components, and the main pump shaft of a sodium cooled fast reactor, etc. The operating conditions of these components are complicated.…”

Section: Introductionmentioning

confidence: 99%

Status Recognition of Magnetic Fluid Seal Based on High-Order Cumulant Image and VGG16

Dai

Xiao²,

Li³

et al. 2022

Front. Mater.

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A magnetic fluid seal is often used in complex working conditions with harsh environmental requirements. Timely and accurate identification of the seal status can help avoid the major economic losses and even casualties caused by the seal failure. However, research on the recognition of magnetic fluid seal status is still at the exploratory stage internationally. Aiming at the problem of inclusion of other components and Gaussian noise when using acoustic emission nondestructive testing technology to detect the magnetic fluid seal status, a new recognition method based on the combination of high-order cumulant image and VGG16 convolutional neural network is proposed to identify the magnetic fluid seal status in this paper. In this method, high-order cumulant images are used for the denoising and feature selecting of detected signals, and the VGG16 convolutional neural network is trained to automatically learn image features to classify and recognize high-order cumulant images representing different sealing states. Experiments show that the accuracy of image recognition using VGG16 is significantly higher than that of other methods. The VGG16 method can identify the magnetic fluid seal state accurately and effectively, with strong robustness and Gaussian noise suppression ability.

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Section: Introductionmentioning

confidence: 99%

Status Recognition of Magnetic Fluid Seal Based on High-Order Cumulant Image and VGG16

Dai

Xiao²,

Li³

et al. 2022

Front. Mater.

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“…9 Attempts are being made to use these types of seals in reciprocating motion, such as in a pneumatic actuator 10 or in a noncontact gravity compensator. 11 When designing a seal, magnetic field numerical simulations are very helpful. They allow the value of the magnetic field in the region of the seal stage to be determined, 12 an appropriate source of the magnetic field to be selected, or the seal structure to be optimized.…”

Section: Introductionmentioning

confidence: 99%

Magnetic fluid seal critical pressure calculation based on numerical simulations

Szczęch

2019

SIMULATION

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Magnetic fluid seals are among the most common ferrofluid applications. One interesting area is the use of numerical simulations to determine the critical pressure, which is a basic parameter determining the possible range of seal operating pressures. The purpose of this study is to present the method of critical pressure calculations in magnetic fluid seals based on magnetic field numerical simulations, which will provide better results than the methods used previously. It is a relatively simple method and can help to reduce the difference between simulations and experiments. Different seal stage shapes, such as symmetric trapezoidal, asymmetric trapezoidal, and rectangular, were taken into account. The research shows that an increase in the magnetic fluid volume applied at the seal stage and a magnetic saturation increase in the seal gap allow the manufacturing inaccuracy influence to be reduced, meaning that the difference between the simulation and experiment results is smaller. In addition, in this paper, the pressure transfer mechanism between liquid rings of the multistage seal is analyzed to show its influence on the critical pressure value calculated based on simulations.

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Regime of aggregate structures and magneto-rheological characteristics of a magnetic rod-like particle suspension: Monte Carlo and Brownian dynamics simulations

Okada

Satoh

2017

Journal of Magnetism and Magnetic Materials

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Noncontact gravity compensator with magnetic fluid seals

Cited by 6 publications

References 9 publications

Status Recognition of Magnetic Fluid Seal Based on High-Order Cumulant Image and VGG16

Status Recognition of Magnetic Fluid Seal Based on High-Order Cumulant Image and VGG16

Magnetic fluid seal critical pressure calculation based on numerical simulations

Regime of aggregate structures and magneto-rheological characteristics of a magnetic rod-like particle suspension: Monte Carlo and Brownian dynamics simulations

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