Method for solving magnetic flux leakage of magnetic shielding space gap in combination with analogue simulation optimization

Abstract

The invention discloses a magnetic shielding space gap magnetic flux leakage solving method combined with analogue simulation optimization, relates to the technical field of magnetic shielding, and aims to solve the problem that residual magnetism of a magnetic shielding space is increased due to a gap. Obtaining the influence relationship of the interlayer spacing between the coating and the gap layer, the gap and the width of the coating on the space residual magnetism performance; s2, in combination with simulation analysis, the optimal coating width under different intervals and gaps is obtained by taking the residual magnetism index when no gap is reached as a reference; and S3, solving the problem that the residual magnetism of the magnetic shielding space is increased due to gap magnetic leakage by optimizing the relative position and size of the coating. According to the technical scheme, the problem that the residual magnetism of the magnetic shielding space is increased due to the gap is solved by optimizing the relative position and size of the coating in combination with analogue simulation optimization guidance; the method can be widely applied to design, operation and maintenance of various magnetic shielding devices and spaces.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic shielding, and particularly relates to a method for solving magnetic leakage in the gaps of a magnetic shielding space optimized by combining simulation. Background Art

[0002] In order to achieve high-precision measurement of extremely weak magnetic fields, it is necessary to use materials with high relative magnetic permeability to create a magnetic shielding space to achieve magnetic circuit shunting, and then complete the shielding of the geomagnetic field (about 50,000 nT). However, limited by factors such as the size of the magnetic shielding material, in practice, whether creating large or small magnetic shielding spaces, there are often gaps. The gaps will cause magnetic leakage (increase in remanence) at the gaps in the magnetic shielding space, and its magnetic noise will also increase, making it impossible to achieve high-precision measurement of extremely weak magnetic fields.

[0003] Chinese Patent with Publication No. CN116583099A discloses a low-magnetic-noise amorphous alloy / FRP magnetic shielding laminate and its manufacturing method. This structure is formed by alternately laying and curing a metal layer and an FRP layer to form a symmetric hybrid composite laminate; wherein the material of the FRP layer is a resin-based fiber-reinforced composite material, and the metal layer is composed of amorphous or nanocrystalline alloy strips spliced together, and the width of the splicing seam does not exceed 1 mm. However, the Chinese patent with Publication No. CN116583099A does not involve specific interlayer splicing seams and specific treatment schemes for the resulting spatial magnetic leakage. Summary of the Invention

[0004] In order to solve the problem of increased remanence in the magnetic shielding space caused by gaps, a method for solving magnetic leakage in the gaps of a magnetic shielding space optimized by combining simulation is proposed, which can be widely applied to the structural design of various magnetic shielding devices and spaces.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A method for solving magnetic leakage in the gaps of a magnetic shielding space optimized by combining simulation, comprising the following steps: S1, obtaining the influence relationship of the layer spacing d between the cladding layer and the gap layer, the gap Δ, and the cladding width W on the spatial remanence performance; S2, combining simulation analysis, taking the remanence index when there is no gap as a benchmark, to obtain the optimal cladding width W at different spacings d and gaps Δ opt ; S3, solving the problem of increased remanence in the magnetic shielding space caused by magnetic leakage in the gaps by optimizing the relative position and size of the cladding layer.

[0006] In this technical solution, after obtaining the relevant parameters of the cladding layer and the gap layer, the influence relationship of these relevant parameters on the spatial residual magnetic performance is obtained; then, combined with simulation analysis, the optimal cladding width under different spacings and gaps is obtained. Furthermore, to solve the problem of magnetic leakage in the magnetic shielding space caused by the gap, the method of this technical solution can be applied to guide the structural design and operation and maintenance of various magnetic shielding devices and spaces.

[0007] The present invention is further configured as: The specific content of step S2 is as follows: Taking the residual magnetic at the center point of the simulation analysis without gaps under the same structure as the benchmark, at different layer spacings d and gaps Δ, cover claddings with different widths, and the cladding width corresponding to the spatial residual magnetic reaching the residual magnetic at the center point of the simulation analysis without gaps under the same structure is the optimal cladding width W opt 。

[0008] In this technical solution, the optimal cladding width is determined through the above steps.

[0009] The present invention is further configured as: The influence relationship of the layer spacing d, gap Δ, and cladding width W between the cladding layer and the gap layer on the spatial residual magnetic performance is obtained through multiple experiments.

[0010] In this technical solution, the above influence relationship can be obtained based on experiments.

[0011] The present invention is further configured as: The simulation analysis includes: Optimizing the relationship between the gap and the layer spacing through the finite element method, solving the spatial magnetic field based on Maxwell's equations. Since there is no current in the space, the curl of the spatial magnetic field is zero; By setting the background magnetic field as the geomagnetic field and converting the geomagnetic field into the magnetic vector potential A b , and adding it to the obtained reduced field vector potential A r and multiplying by the gap to obtain the spatial magnetic flux density B.

[0012] In this technical solution, the spatial magnetic flux density can be obtained through the above analysis.

[0013] The present invention is further configured as: The simulation analysis further includes the boundary conditions of magnetic shielding, and these conditions include: Obtaining the tangential magnetic field on the shielding layer by the magnetic field intensities on both sides of the shielding layer boundary; Calculating and obtaining the tangential magnetic flux density of the shielding layer through the vector potential on both sides inside and outside the boundary and the set shielding layer thickness d s ; The ratio of the modulus of the tangential magnetic flux density to the modulus of the tangential magnetic field is the magnetic permeability of the shielding layer.

[0014] The present invention is further configured such that the layer spacing d between the cladding layer and the gap layer does not exceed 5 mm; the size of the gap Δ does not exceed 4 mm.

[0015] In this technical solution, the layer spacing between the cladding layer and the gap layer should meet the condition of not exceeding 5 mm, and the gap should meet the condition of not exceeding 4 mm.

[0016] The present invention is further configured such that the cladding layer is specifically a thin - strip - type magnetic shielding material, the relative magnetic permeability of the thin - strip - type magnetic shielding material is higher than 5000, and the thickness of the thin - strip - type magnetic shielding material does not exceed 2 mm.

[0017] In this technical solution, the material of the cladding layer is a thin - strip - type magnetic shielding material, which needs to meet the conditions of having a magnetic permeability higher than 5000 and a thickness not exceeding 2 mm.

[0018] The present invention is further configured such that the thin - strip - type magnetic shielding material is made of amorphous and / or nanocrystalline alloy, permalloy, silicon steel, soft magnetic composite material; preferably, it is made of amorphous and / or nanocrystalline material.

[0019] The present invention is further configured such that the gap covering process of the thin - strip - type magnetic shielding material specifically adopts the methods of applying glue to the material, laser welding, and curing and forming.

[0020] In this technical solution, the gap covering process of the thin - strip - type magnetic shielding material is completed by applying glue to the material, laser welding, and curing and forming.

[0021] The present invention is further configured such that the thickness of the thin - strip - type magnetic shielding material is 20 μm to 50 μm.

[0022] In this technical solution, preferably, the thickness of the thin - strip - type magnetic shielding material is set between 20 μm and 50 μm, which can better achieve the optimization effect.

[0023] The present invention can bring the following beneficial effects: A method for solving the magnetic leakage problem of the gap in the magnetic shielding space by combining simulation optimization according to the present invention can solve the magnetic leakage problem of the magnetic shielding space caused by the gap, and can be applied to guide the structural design and operation and maintenance of various magnetic shielding devices and spaces. Brief Description of the Drawings

[0024] Figure 1 is a schematic flow chart of a method for solving the magnetic leakage problem of the gap in the magnetic shielding space by combining simulation optimization according to the present application.

[0025] Figure 2 is a schematic diagram of the relevant parameters of the cladding layer and the gap layer of a method for solving the magnetic leakage problem of the gap in the magnetic shielding space by combining simulation optimization according to the present application.

[0026] Figure 3 When the barrel diameter D = 80 mm and the gap Δ = 0.25 mm, B r / B r，Δ＝0 Variation diagrams with respect to d / D and W / Δ.

[0027] Figure 4 When the barrel diameter D = 80 mm and the gap Δ = 0.50 mm, B r / B r，Δ＝0 Variation diagrams with respect to d / D and W / Δ.

[0028] Figure 5 When the barrel diameter D = 80 mm and the gap Δ = 1.00 mm, B r / B r，Δ＝0 Variation diagrams with respect to d / D and W / Δ.

[0029] Figure 6 When the barrel diameter D = 80 mm and the gap Δ = 2.00 mm, B r / B r，Δ＝0 Variation diagrams with respect to d / D and W / Δ.

[0030] Figure 7 When the barrel diameter D = 80 mm and the gap Δ = 4.00 mm, B r / B r，Δ＝0 Variation diagrams with respect to d / D and W / Δ.

[0031] Figure 8 When the barrel diameter D = 80 mm, B r / B r，Δ＝0 Variation diagrams of W / Δ corresponding to B = 100% with respect to d / D and the gap Δ.

[0032] Figure 9 When the barrel diameter D = 80 mm, with the layer spacing d = 1.00 mm, Δ = 1.00 mm, and W = 10.00 mm, B r / B r，Δ＝0 Variation diagrams with respect to the cladding thickness ( = 10, 20, 40, 80, 100, 125, 150, 160, 175, 300, 500 μm).

[0033] Figure 10 Physical diagram of the magnetic shielding composite material laminate prepared using a thin strip - type material.

[0034] Reference numerals 100, magnetic shielding barrel 1, gap layer 2, cladding. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific implementation manners described herein are only the best embodiments of the present invention, which are only used to explain the present invention and do not limit the protection scope of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0036] In the prior art, a Chinese patent with the publication number CN116583099A discloses a low-magnetic-noise amorphous alloy FRP magnetic shielding laminate and its manufacturing method. Its structure includes a symmetric hybrid composite laminate formed by alternately laying and curing a metal layer and an FRP layer. The material of the FRP layer is a resin-based fiber-reinforced composite material, and the metal layer is composed of amorphous or nanocrystalline alloy strips spliced together, and the width of the splicing seam does not exceed 1 mm. This structure realizes efficient magnetic shielding under low magnetic noise through the characteristics of high resistivity and high magnetic permeability of amorphous or nanocrystalline alloy strips, solves the problem of poor mechanical support of metal strips through FRP composites, avoids the influence of external load disturbances on amorphous strips, and constructs a "magnetic conduction / non-magnetic conduction / magnetic conduction" multi-layer shielding structure, which greatly improves the shielding efficiency of the material compared with homogeneous materials. This laminate structure can be applied to the construction of large magnetic shielding cabins, and the magnetic circuits between the magnetic conduction metal layers of different laminates can be mutually conducted through edge trimming, which has strong practical value.

[0037] However, the Chinese patent with the publication number CN116583099A does not involve specific treatment solutions for the specific interlayer splicing seams and the resulting spatial magnetic leakage.

[0038] Embodiment 1 In view of the defects existing in the above-mentioned prior art, this embodiment proposes a method for solving magnetic shielding space gap magnetic leakage optimized by simulation. Refer to Figure 1 , which specifically relates to the technical field of magnetic shielding. It mainly provides a technical solution for solving the problem of increased residual magnetism in the magnetic shielding space caused by gaps by optimizing the relative position and size of the cladding. This technical solution can guide the construction of various magnetic shielding devices or magnetic shielding spaces and provide guidance for the repair work of the gaps in existing magnetic shielding devices or magnetic shielding spaces, such as composite magnetic shielding laminates, ultra-high-sensitivity extremely weak magnetic field and inertial measurement devices, medical cardiac magnetic measurement magnetic shielding cabins, and medical brain magnetic measurement magnetic shielding cabins.

[0039] Refer to Figure 2 , and take the magnetic shielding barrel 100 as an example for illustration. Among them, the diameter of the magnetic shielding barrel is denoted as D, the layer spacing between the cladding 2 and the gap layer 1 is d, the gap is Δ, and the width of the cladding is W.

[0040] Step S1. First, obtain the influence relationships of the layer spacing d between the cladding layer and the gap layer, the gap Δ, and the cladding width W on the spatial remanence performance. Specifically, the influence relationships of the layer spacing d between the cladding layer and the gap layer, the gap Δ, and the cladding width W on the spatial remanence performance are obtained through multiple experiments.

[0041] Step S2. Subsequently, combined with simulation analysis, taking the remanence index when there is no gap as a benchmark, the optimal cladding width W under different spacings d and gaps Δ can be obtained. opt

[0042] Step S3. Solve the problem of the increase in the spatial remanence of the magnetic shield caused by magnetic leakage through the gap by optimizing the relative position and size of the cladding layer.

[0043] In the above technical solution, after obtaining the relevant parameters of the cladding layer and the gap layer, the influence relationships of these relevant parameters on the spatial remanence performance are obtained. Then, combined with simulation analysis, the optimal cladding width under different spacings and gaps is obtained. Furthermore, the problem of magnetic leakage in the magnetic shield space caused by the gap is solved. The method of this technical solution can be applied to guide the structural design of various magnetic shield devices and spaces.

[0044] Furthermore, Step S2 mainly includes the following process: Taking the remanence at the center point of the simulation analysis without a gap under the same structure as a benchmark, covering cladding layers with different widths under different layer spacings d and gaps Δ, and taking the cladding width corresponding to the spatial remanence reaching the remanence at the center point of the simulation analysis without a gap under the same structure as the optimal cladding width W. opt

[0045] For the above simulation analysis, it mainly includes the following process.

[0046] The finite element method is used to optimize the relationship between the gap and the layer spacing, and the spatial magnetic field is solved according to Maxwell's equations. Since there is no current in the space, the curl of the spatial magnetic field can be obtained as zero. Specifically, the following formula can be referred to: Among them, H represents the spatial magnetic field, and J represents the curl of the spatial magnetic field.

[0047] The background magnetic field is set as the geomagnetic field, and the geomagnetic field is transformed into the magnetic vector potential A. b , combined with the reduced field vector potential A obtained by solving r , finally, the spatial magnetic flux density B can be obtained. Specifically, the following formula can be referred to: Specifically, the spatial magnetic flux density B is the product of the sum of the magnetic vector potential A b and the reduced field vector potential A r and the gap.

[0048] The boundary conditions of magnetic shielding refer to the following two formulas: n×(H1 - H2) = n×H T Among them, the first of the above formulas represents obtaining the tangential magnetic field on the shielding layer from the magnetic field intensities on both sides of the shielding layer boundary, and the second formula is to calculate and obtain the tangential magnetic flux density of the shielding layer through the vector potential A on both sides inside and outside the boundary and the set thickness d of the shielding layer. s The ratio of the modulus of the tangential magnetic flux density to the modulus of the tangential magnetic field is the magnetic permeability of the shielding layer.

[0049] More specifically, for the layer spacing d between the slit layer and the cladding layer, its size does not exceed 5 mm, and for the slit, its size does not exceed 4 mm.

[0050] In this technical solution, the layer spacing between the cladding layer and the slit layer should meet the condition of not exceeding 5 mm, and the slit should meet the condition of not exceeding 4 mm.

[0051] The material of the cladding layer is specifically a thin - strip - type magnetic shielding material. The relative magnetic permeability of the thin - strip - type magnetic shielding material needs to be higher than 5000, and the thickness of the thin - strip - type magnetic shielding material does not exceed 2 mm.

[0052] In this technical solution, the material of the cladding layer is a thin - strip - type magnetic shielding material, which needs to meet the conditions of a magnetic permeability higher than 5000 and a thickness not exceeding 2 mm.

[0053] In this embodiment, the thin - strip - type magnetic shielding material specifically used is amorphous and / or nanocrystalline alloy, permalloy, silicon steel, soft magnetic composite material.

[0054] The slit covering process of the thin - strip - type magnetic shielding material specifically adopts the methods of applying glue to the material, laser welding, and curing and forming.

[0055] In this technical solution, the slit covering process of the thin - strip - type magnetic shielding material is completed by applying glue to the material, laser welding, and curing and forming.

[0056] Preferably, the thickness of the thin - strip - type magnetic shielding material is 20 μm to 50 μm. In this technical solution, setting the thickness of the thin - strip - type magnetic shielding material between 20 μm and 50 μm can better achieve the optimization effect.

[0057] A method for solving the magnetic leakage problem of gaps in a magnetic shielding space optimized by combining simulation, which can be applied to various magnetic shielding devices and the construction of various high-performance magnetic shielding spaces such as ultra-high sensitivity extremely weak magnetic field and inertial measurement devices, medical magnetocardiogram, and magnetoencephalogram measurement magnetic shielding chambers. This method can guide the laying method of thin strip materials to prepare magnetic shielding laminate composites and use magnetic shielding thin strips to cover the gaps to solve the problem of increased local residual magnetism in the magnetic shielding space.

[0058] Some of the proper nouns that appeared in the above embodiments are explained here.

[0059] Magnetic shielding: Specifically refers to the phenomenon of reducing or redirecting the magnetic field in a specific area through certain technical means; for example, using the characteristic that magnetic induction lines preferentially pass through materials with high relative magnetic permeability, a magnetic shielding device made of high magnetic permeability materials (such as permalloy, manganese-zinc ferrite, amorphous and / or nanocrystalline alloy) can achieve a 5-order-of-magnitude attenuation of the external magnetic field.

[0060] Residual magnetism: Specifically refers to the remaining magnetic field retained in the material after the external magnetic field has been removed, and is represented by B r This residual magnetism may occur in magnets, ferromagnetic substances, and certain types of metal materials. The intensity of the residual magnetism depends on the intensity of the external magnetic field, the magnetism of the material, and the length of time the material is exposed to the magnetic field.

[0061] Amorphous and / or nanocrystalline alloy: Amorphous alloy, also known as metallic glass, is an alloy material with an amorphous structure obtained by technical means such as rapid cooling to avoid crystallization of the material. Annealing the amorphous alloy to cause crystallization is a main technical means to obtain nanocrystalline alloy. Therefore, in this embodiment, amorphous alloy and nanocrystalline alloy are regarded as a large class of materials for discussion and are collectively referred to as amorphous and / or nanocrystalline alloy.

[0062] Embodiment 2 Based on Embodiment 1, the specific process of preparing a magnetic shielding barrel by covering the gap with an amorphous and / or nanocrystalline alloy thin strip is as follows: (1) Clean and degrease the surface of the amorphous and / or nanocrystalline strip. (2) Apply glue to the amorphous and / or nanocrystalline strip processed in (1). (3) Cut according to the required strip size. (4) Paste it to the gap to make relevant devices.

[0063] Embodiment 3 This embodiment proposes a method for solving the magnetic leakage problem of the gap in the magnetic shielding space optimized by combining simulation. Taking the magnetic shielding barrel as an example, the diameter of the magnetic shielding barrel is denoted as D, the layer spacing between the cladding layer and the gap layer is d, the gap is Δ, and the width of the cladding layer is W.

[0064] Step S1, first, obtain the influence relationship of the layer spacing d between the cladding layer and the gap layer, the gap Δ, and the width W of the cladding layer on the residual magnetic performance of the space; among them, the influence relationship of the layer spacing d between the cladding layer and the gap layer, the gap Δ, and the width W of the cladding layer on the residual magnetic performance of the space is specifically obtained through multiple experiments.

[0065] Step S2, subsequently, combined with simulation analysis, taking the residual magnetic index when there is no gap as the benchmark, the optimal width W of the cladding layer under different spacings d and gaps Δ can be obtained opt 。

[0066] In the above technical solution, after obtaining the relevant parameters of the cladding layer and the gap layer, the influence relationship of these relevant parameters on the residual magnetic performance of the space is obtained; then, combined with simulation analysis, the optimal width of the cladding layer under different spacings and gaps is obtained. Furthermore, the problem of magnetic leakage in the magnetic shielding space caused by the gap is solved. The method of this technical solution can be applied to guide the structural design and operation and maintenance of various magnetic shielding devices and spaces.

[0067] Further, step S2 mainly includes the following process: taking the residual magnetic at the center point of the simulation analysis when there is no gap under the same structure as the benchmark, covering cladding layers with different widths under different layer spacings d and gaps Δ, and taking the width of the cladding layer corresponding to when the residual magnetic in the space reaches the residual magnetic at the center point of the simulation analysis when there is no gap under the same structure as the optimal width W of the cladding layer opt 。

[0068] For the above simulation analysis, it mainly includes the following process.

[0069] The finite element method is used to optimize the relationship between the gap and the layer spacing, and the spatial magnetic field is solved according to Maxwell's equations. Since there is no current in the space, the curl of the spatial magnetic field can be obtained as zero. Specifically, it can be referred to the following formula: Among them, H represents the spatial magnetic field, and J represents the curl of the spatial magnetic field.

[0070] The background magnetic field is set as the geomagnetic field, and the geomagnetic field is transformed into the magnetic vector potential A b ,Combined with the reduced field vector potential A obtained by solving r Finally, the spatial magnetic flux density B can be obtained. Specifically, it can be referred to the following formula: Specifically, the spatial magnetic flux density B is the magnetic vector potential A bThe sum with the reduced field vector potential A r Multiplied by the gap.

[0071] The boundary conditions for magnetic shielding refer to the following two formulas: n×(H1 - H2) = n×H T Among them, the first of the above formulas represents obtaining the tangential magnetic field on the shielding layer from the magnetic field intensities on both sides of the shielding layer boundary, and the second formula is to calculate and obtain the tangential magnetic flux density of the shielding layer through the vector potential A on both sides inside and outside the boundary and the set thickness d of the shielding layer. s The ratio of the tangential magnetic flux density modulus to the tangential magnetic field modulus is the magnetic permeability of the shielding layer.

[0072] More specifically, for the layer spacing d between the gap layer and the cladding layer, its size does not exceed 5 mm, and for the gap, its size does not exceed 4 mm.

[0073] In this technical solution, the layer spacing between the cladding layer and the gap layer should meet the condition of not exceeding 5 mm, and the gap should meet the condition of not exceeding 4 mm.

[0074] The material of the cladding layer is specifically a thin - strip magnetic shielding material. The relative magnetic permeability of the thin - strip magnetic shielding material needs to be higher than 5000, and the thickness of the thin - strip magnetic shielding material does not exceed 2 mm.

[0075] In this technical solution, the material of the cladding layer is a thin - strip magnetic shielding material, which needs to meet the conditions of having a magnetic permeability higher than 5000 and a thickness not exceeding 2 mm.

[0076] In this embodiment, the thin - strip magnetic shielding material specifically used is amorphous and / or nanocrystalline alloy, permalloy, silicon steel, soft magnetic composite material.

[0077] The gap covering process of the thin - strip magnetic shielding material specifically adopts the methods of applying glue to the material, laser welding, and curing and forming.

[0078] In this technical solution, the gap covering process of the thin - strip magnetic shielding material is completed by applying glue to the material, laser welding, and curing and forming.

[0079] Preferably, the thickness of the thin - strip magnetic shielding material is 20 μm to 50 μm. In this technical solution, setting the thickness of the thin - strip magnetic shielding material between 20 μm and 50 μm can better achieve the optimization effect.

[0080] A method for solving the magnetic leakage of the space gap of a magnetic shield optimized by combining simulation, which can be applied to various magnetic shield devices and the construction of various high-performance magnetic shield spaces such as ultra-high sensitive extremely weak magnetic field and inertial measurement devices, medical magnetocardiogram, and magnetoencephalogram measurement magnetic shield chambers. This method can guide the laying method of thin strip materials to prepare magnetic shield laminate composites and use magnetic shield thin strips to cover the gaps to solve the problem of increased local residual magnetism in the magnetic shield space.

[0081] On the basis of Embodiment 1, when the diameter D of the magnetic shield barrel is 80 mm and the gap Δ is 0.25 mm, B r / B r，Δ＝0 The variation relationship with d / D and W / Δ can be specifically referred to Figure 3 in the schematic diagram. Taking the center point residual magnetism of the simulation analysis without gaps under the same structure as the benchmark, that is, B r / B r，Δ＝0 = 100%, the combination of the corresponding optimal layer spacing d and the cladding width W can be obtained when the gap Δ is 0.25 mm. It can be seen from Figure 3 that, taking the residual magnetism index without gaps as the benchmark, when the gap Δ is 0.25 mm, the larger the W, the smaller the corresponding d. Among them, the typical combinations of (W opt / Δ, d / D) can be (11.6, 0.31%) and (4.0, 1.25%).

[0082] Embodiment 4 On the basis of Embodiment 1, when the diameter D of the magnetic shield barrel is 80 mm and the gap Δ is 0.50 mm, B r / B r，Δ＝0 The variation relationship with d / D and W / Δ can be specifically referred to Figure 4 in the schematic diagram. Taking the center point residual magnetism of the simulation analysis without gaps under the same structure as the benchmark, that is, taking B r / B r，Δ＝0 = 100%, the combination of the corresponding optimal layer spacing d and the cladding width W can be obtained when the gap Δ is 0.50 mm. It can be seen from Figure 4 that, taking the residual magnetism index without gaps as the benchmark, when the gap Δ is 0.50 mm, the larger the W, the smaller the corresponding d. Among them, the typical combinations of (W opt / Δ, d / D) can be (13.2, 0.31%) and (0.88, 6.25%).

[0083] Embodiment 5 On the basis of Embodiment 1, when the diameter D of the magnetic shield barrel is 80 mm and the gap Δ is 1.00 mm, B r / B r，Δ＝0 The variation relationship with d / D and W / Δ can be specifically referred toFigure 5 Schematic diagram. Taking the residual magnetism at the center point of the simulation analysis without gaps under the same structure as the benchmark, that is, taking B r / B r，Δ＝0 = 100%, the combination of the corresponding optimal layer spacing d and the cladding width W is obtained when the gap Δ = 1.00 mm. It can be seen from Figure 5 that, taking the residual magnetism index without gaps as the benchmark, when the gap Δ = 1.00 mm, the larger the W, the smaller the corresponding d. Among them, the typical combinations of (W opt / Δ, d / D) can be (9.2, 0.63%) and (2.0, 3.13%).

[0084] Example 6 On the basis of Example 1, when the diameter D of the magnetic shielding barrel is 80 mm and the gap Δ = 2.00 mm, the variation relationship of B r / B r，Δ＝0 with d / D and W / Δ can be specifically referred to the Figure 6 schematic diagram. Taking the residual magnetism at the center point of the simulation analysis without gaps under the same structure as the benchmark, that is, taking B r / B r，Δ＝0 = 100%, the combination of the corresponding optimal layer spacing d and the cladding width W is obtained when the gap Δ = 2.00 mm. It can be seen from Figure 6 that, taking the residual magnetism index without gaps as the benchmark, when the gap Δ = 2.00 mm, the larger the W, the smaller the corresponding d. Among them, the typical combinations of (W opt / Δ, d / D) can be (11.6, 0.63%) and (7.0, 1.25%).

[0085] Example 7 On the basis of Example 1, when the diameter D of the magnetic shielding barrel is 80 mm and the gap Δ = 4.00 mm, the variation relationship of B r / B r，Δ＝0 with d / D and W / Δ can be specifically referred to the Figure 7 schematic diagram. Taking the residual magnetism at the center point of the simulation analysis without gaps under the same structure as the benchmark, that is, taking B r / B r，Δ＝0 = 100%, the combination of the corresponding optimal layer spacing d and the cladding width W is obtained when the gap Δ = 4.00 mm. It can be seen from Figure 7 that, taking the residual magnetism index without gaps as the benchmark, when the gap Δ = 4.00 mm, the larger the W, the smaller the corresponding d. Among them, the typical combinations of (W opt / Δ, d / D) can be (27.9, 0.31%) and (2.2, 6.25%).

[0086] Example 8 Based on Example 1, referring to Figure 8 , when the diameter D of the magnetic shielding barrel is 80 mm, the relationship between W r / B r，Δ＝0 = 100% corresponding to Δ with respect to d / D and the gap Δ; from opt it can be seen that the W Figure 8 corresponding to B r / B r，Δ＝0 = 100% decreases with the increase of d / D and increases with the increase of Δ. opt / Δ decreases with the increase of d / D and increases with the increase of Δ.

[0087] Example 9 Based on Example 1, referring to Figure 9 , which can illustrate the influence of the cladding thickness on the residual magnetic field B r at the center of the magnetic shielding space after covering the gap. Figure 9 It can show the variation of B r / B r，Δ＝0 with respect to the cladding thickness (10 μm, 20 μm, 40 μm, 80 μm, 100 μm, 125 μm, 150, 160, 175 μm, 300 μm, 500 μm) under the conditions that the layer spacing d between the cladding and the gap layer is 1.00 mm, the gap Δ is 1.00 mm, and the cladding width W is 10.00 mm. The results show that as the thickness of the cladding increases, the residual magnetic field index that can be achieved after the cladding decreases rapidly and then levels off.

[0088] Example 10 This example is used to illustrate the application of the present invention in guiding the laying method of thin strip materials to prepare a magnetic shielding laminate. The physical diagram of the composite magnetic shielding material laminate prepared is as Figure 10 shown.

[0089] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A method for solving the magnetic leakage of the space gap of a magnetic shield by combining simulation optimization, characterized in that, It includes the following steps: S1. Obtain the influence relationships of the layer spacing d between the cladding layer and the slit layer, the slit Δ, and the cladding width W on the spatial residual magnetic performance; S2. Based on the residual magnetic index at seamless condition obtained through simulation analysis, the optimal cladding width W at different spacings d and gaps Δ is obtained. opt ; S3. Solve the increase in the spatial residual magnetic field caused by magnetic leakage through the slit by optimizing the relative position and size of the cladding layer.

2. A method for solving magnetic leakage in the space gap of a magnetic shield optimized by combining simulation and simulation, characterized in that, The influence relationships of the layer spacing d between the cladding layer and the slit layer, the slit Δ, and the cladding width W on the spatial residual magnetic performance are obtained through multiple experiments.

3. A method for solving magnetic leakage in the space gap of a magnetic shield optimized by combining simulation and simulation, characterized in that, The specific content of step S2 is as follows: Based on the residual magnetism at the center point of the simulation analysis when there is no gap under the same structure, at different layer spacings d and gaps Δ, claddings with different widths are covered, and the cladding width corresponding to the situation where the spatial residual magnetism reaches the residual magnetism at the center point of the simulation analysis when there is no gap under the same structure is the optimal cladding width W opt .

4. A method for solving magnetic leakage in the gap of a magnetic shielding space optimized by combining simulation and optimization, as claimed in claim 1 or 2, characterized in that The simulation analysis includes: Optimize the relationship between the slit and the layer spacing by the finite element method, and solve the spatial magnetic field based on Maxwell's equations. Since there is no current in the space, the curl of the spatial magnetic field is zero; By setting the background magnetic field as the geomagnetic field and converting the geomagnetic field into the magnetic vector potential A b , adding it to the obtained reduced field vector potential A r , multiplying the sum by the slit to obtain the spatial magnetic flux density B.

5. A method for solving the magnetic leakage of the space gap of a magnetic shield optimized by combining simulation and simulation, characterized in that, The simulation analysis also includes the boundary conditions of the magnetic shielding, and these conditions include: Obtain the tangential magnetic field on the shielding layer by the magnetic field strengths on both sides of the boundary of the shielding layer; Based on the vector potential on both sides inside and outside the boundary and the set shielding layer thickness d s Calculate and obtain the tangential magnetic flux density of the shielding layer; The ratio of the modulus of the tangential magnetic flux density to the modulus of the tangential magnetic field is the magnetic permeability of the shielding layer.

6. A method for solving the magnetic leakage of the space gap of a magnetic shield optimized by combining simulation and simulation, characterized in that, The size of the layer spacing d between the cladding layer and the slit layer does not exceed 5 mm; the size of the slit Δ does not exceed 4 mm.

7. A method for solving magnetic leakage in the gap of a magnetic shielding space optimized by combining simulation and simulation, characterized in that, The cladding layer is specifically a thin-strip magnetic shielding material, the relative magnetic permeability of the thin-strip magnetic shielding material is higher than 5000, and the thickness of the thin-strip magnetic shielding material does not exceed 2 mm.

8. A method for solving the magnetic leakage of the space gap of a magnetic shield optimized by combining simulation and optimization, characterized in that, The thin-strip magnetic shielding material adopts amorphous and / or nanocrystalline alloys, permalloys, silicon steels, and soft magnetic composite materials.

9. A method for solving magnetic leakage in the space gap of a magnetic shield optimized by combining simulation and optimization, as claimed in claim 7 or 8, wherein, The slit covering process of the thin-strip magnetic shielding material specifically adopts the methods of applying glue to the material, laser welding, and curing and forming.

10. A method for solving the magnetic leakage of the space gap of a magnetic shield optimized by combining simulation, characterized in that, The thickness of the thin-strip magnetic shielding material is 20 μm to 50 μm.

Images