Calculation of magnetic field from steel rebar of building with machine producing high stray field

Amoskov, Victor M.; Bazarov, A. M.; Belyakov, V. A.; Gapionok, E.; Gribov, Y.; Kaparkova, Marina V.; Kukhtin, V.; Lamzin, E.; Lyublin, B. V.; Ovsyannikov, Dmitri; Sytchevsky, S.

doi:10.1016/j.fusengdes.2018.07.026

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…Based on this method, the tensile state of the ribbed reinforcement embedded in the concrete structure is determined. Amoskov et al [17] carried out numerical veri cation on the magnetic effect of reinforced concrete structures. The model is based on the concept of lling factor and takes into ac-count the magnetic anisotropy related to the reinforcement pattern.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Measurement and Analysis Method of Influence of Remanence of Carbon Steel Structure on Magnetic Shielding Devices

Zhu

Sha

Cao

et al. 2023

Preprint

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The magnetic shielding device is usually composed of multiple layers of high magnetic permeability materials (such as permalloy), which can achieve the residual magnetic field of nano Tesla (nT) level or even lower. For large magnetic shielding devices, large mesh enclosures are required for protection. Taking into account factors such as stiffness and strength, the large reticulated shell structures are usually composed of carbon steel (Q355B), and its remanence will affect the magnetic field inside the magnetic shielding device and particularly destroys the uniformity of the magnetic field of the active magnetic compensation system. Therefore, it is of great significance to measure the remanence of the materials used in the external reticulated shell structure of large magnetic shielding devices. In previous studies, the influence of remanence of external materials on the magnetic shielding devices has been neglected. To overcome this problem, a method for measuring and analyzing the effect of remanence in steel structures on magnetic shielding devices is proposed. Firstly, the simplified finite element simulation model of the steel structure was established to analyze the effect of remanence inside the steel structure on the magnetic field distribution. Then, a test method for the effect of remanence inside the steel structure is proposed. The test results are in agreement with the finite element analysis results. The results show that the larger the internal remanence of the steel structure, the greater the effect on the active magnetic compensation system. The farther the distance from the steel structure, the less the influence of the steel structure's remanence on the magnetic field. The method proposed in this paper can be used to analyze the influence of remanence in steel structures, which can provide an optimal location solution for the design of magnetic shielding systems.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Measurement and Analysis Method of Influence of Remanence of Carbon Steel Structure on Magnetic Shielding Devices

Zhu

Sha

Cao

et al. 2023

Preprint

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“…The greatest advantage of this method is that it can determine the tensile state of the steel bars in concrete based on the variation in the measured magnetic permeability. In addition, Amoskov et al [25] utilized a numerical analysis method based on the filling factor to analyze the magnetic anisotropy of steel reinforcement structures in concrete.…”

Section: Introductionmentioning

confidence: 99%

The Effect of a Ferromagnetic Steel Enclosure on Magnetic Shielding Systems: Analysis, Modeling, and Experimental Validation

Cheng,

Huang,

Luo

et al. 2024

Machines

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The magnetic shielding device, made of high-permeability soft magnetic material, is sensitive to external influences and requires a protective steel enclosure. A steel enclosure, being strongly ferrimagnetic, can alter the surrounding magnetic field distribution, thus impacting the shielding effectiveness. This study proposes a novel analytical approach to quantify this effect, which has not been previously researched. The method develops a simplified finite element simulation model based on the structural symmetry of the steel enclosure. By using this model, this study analyzes the impact of steel structures with varying heights, widths, and remanent magnetization values. The validity of the method is confirmed through experimental tests on steel buildings. The findings offer insights into the optimal placement of magnetic shielding systems and provide theoretical guidance for designing large-scale magnetic shielding devices.

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“…Calculation results. As shown [17,18], a required engineering accuracy of a few percent for field evaluation with regard to the effect of steel rebar reinforcement can be largely provided with an isotropic model described below.…”

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confidence: 99%

“…A comparison and cross-checking computations on model validation are presented in [17][18][19]. Being calculated on the base of analytical expressions, the field as the "Maxwell" one simulated with the code KLONDIKE is smooth by definition.…”

mentioning

confidence: 99%

“…In the perpendicular direction to this plane there are no bars to conduct effectively the magnetic flux. As the consequence, the magnetization in the perpendicular direction must be weak, and the effect of the corresponding field component manifests relatively weakly [17,18]. Figure 8 presents a simulated field map produced by the magnetized steel structures of the tokamak building only at the End-Of-Burn (EOB) state of the representative 15 MA DT scenario, when the stray field of the tokamak is maximal.…”

mentioning

confidence: 99%

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Magnetic model MMTC-2.2 of ITER tokamak complex

2019

Vestnik SPbSU Applied Mathematics Computer Science Control Proc

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The stray poloidal magnetic field produced in ITER outside the tokamak is significantly higher than in any present machines. This magnetic field magnetizes the steel rebar reinforcing the building concrete structures enclosing the tokamak. As a result, reinforced structures of the ITER building may produce a substantial magnetic field with the axisymmetric component (toroidal mode number n = 0) affecting the plasma initiation and non-axisymmetric components ("error fields" with n = 1; 2) deteriorating plasma performance. This paper presents an upgraded Magnetic Model of the ITER Tokamak Complex, MMTC-2.2, for assessment of the stray field associated with the reinforced structures. This magnetic model MMTC-2.2 takes into account the CATIA models of the Tokamak Complex Buildings and volumetric fractions of steel for the rebar in the building structures as they were in the design in 2016.

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Calculation of magnetic field from steel rebar of building with machine producing high stray field

Cited by 6 publications

References 7 publications

RETRACTED: Measurement and Analysis Method of Influence of Remanence of Carbon Steel Structure on Magnetic Shielding Devices

RETRACTED: Measurement and Analysis Method of Influence of Remanence of Carbon Steel Structure on Magnetic Shielding Devices

The Effect of a Ferromagnetic Steel Enclosure on Magnetic Shielding Systems: Analysis, Modeling, and Experimental Validation

Magnetic model MMTC-2.2 of ITER tokamak complex

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