CN114169246A - Design method of high-performance low-noise magnetic shielding barrel - Google Patents
Design method of high-performance low-noise magnetic shielding barrel Download PDFInfo
- Publication number
- CN114169246A CN114169246A CN202111518732.6A CN202111518732A CN114169246A CN 114169246 A CN114169246 A CN 114169246A CN 202111518732 A CN202111518732 A CN 202111518732A CN 114169246 A CN114169246 A CN 114169246A
- Authority
- CN
- China
- Prior art keywords
- layer
- magnetic shielding
- magnetic
- barrel
- noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000013461 design Methods 0.000 title claims abstract description 17
- 238000005457 optimization Methods 0.000 claims abstract description 39
- 239000002245 particle Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 6
- 230000005347 demagnetization Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 229910000889 permalloy Inorganic materials 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 98
- 239000011229 interlayer Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000011160 research Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/27—Design optimisation, verification or simulation using machine learning, e.g. artificial intelligence, neural networks, support vector machines [SVM] or training a model
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/10—Noise analysis or noise optimisation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Evolutionary Computation (AREA)
- Theoretical Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Medical Informatics (AREA)
- Software Systems (AREA)
- Artificial Intelligence (AREA)
- Computer Hardware Design (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a design method of a high-performance low-noise magnetic shielding barrel, which takes a four-layer magnetic shielding barrel as a research object, aims at the problem of how to simultaneously realize optimization of magnetic shielding performance and magnetic noise, establishes an optimization scheme of structural parameters of the four-layer magnetic shielding barrel by a constrained multi-parameter particle swarm optimization method, and optimizes the length of an innermost layer barrel
Radius of innermost barrel
Thickness t of each layeriInter-layer axial spacing DLiInter-layer radial spacing DRiAnd 12 structural parameters are equal, so that the design effect of high shielding performance and low noise is realized. The invention improves the axial shielding factor of the magnetic shielding barrel by one based on the particle swarm optimization algorithmThe magnetic noise is reduced by 15%, and the method can be widely applied to the field of weak magnetic measurement to manufacture a weak magnetic environment.
Description
Technical Field
The invention relates to a design method of a high-performance low-noise magnetic shielding barrel, which can improve the axial shielding factor of the magnetic shielding barrel by one order of magnitude and reduce the magnetic noise by 15 percent, and belongs to the technical field of magnetic shielding.
Background
The theoretical sensitivity of the atomic spin magnetometer can reach
The method becomes a research hotspot in the field of extremely weak magnetic measurement, and the premise of realizing the extremely weak magnetic measurement with ultrahigh sensitivity is to fully isolate the interference of an external magnetic field and a noise signal, and is usually realized by adopting a multilayer magnetic shielding barrel. Because the sensitivity of the atomic spin magnetometer is limited by the background magnetic field noise signal in practical work, it is necessary to develop a high-performance low-noise magnetic shielding barrel.
The performance indexes of the magnetic shielding barrel comprise magnetic shielding factors and magnetic noise, and the structural design of the magnetic shielding barrel usually only considers the magnetic shielding factors but neglects the influence of the magnetic noise at present, so that the designed magnetic shielding barrel cannot achieve the optimal performance.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the design method of the high-performance low-noise magnetic shielding barrel is used for improving the shielding performance and reducing the magnetic noise.
The technical solution of the invention is as follows: a design method of a high-performance low-noise magnetic shielding barrel comprises the following steps:
(1) establishing a four-layer magnetic shielding barrel with a cover total radial magnetic shielding factor model:
establishing a four-layer magnetic shielding barrel total axial magnetic shielding factor model with a cover:
wherein,
is the radial magnetic shielding factor of the ith layer of magnetic shielding barrel,
μiis the permeability of the ith layer of material, fi＝1+Li/100DiEnd cap shielding coefficient of axial shielding factor of i-th layer, DiIs the i-th shield layer outer diameter, LiIs the i-th shielding layer outer length, tiThe thickness of the ith shielding layer (i is more than or equal to 1 and less than or equal to 4).
(2) Establishing a magnetic noise model generated by the innermost magnetic shielding barrel:
wherein, mu0＝4π×10-7N/A2Is a vacuum permeability of r1＝D1/2-t1The inner radius of the innermost layer, k is 1.38 × 10-23J/K is boltzmann constant, T is kelvin temperature, σ is electrical conductivity of the innermost shielding material, G is a coefficient related to aspect ratio L/D, and when L/D is 1, 1.5, 2, G is 0.657, 0.460, 0.438, respectively.
(3) Establishing a total volume model of the four-layer magnetic shielding barrel with the cover:
wherein,
is the volume of the ith layer of magnetic shielding barrel. diIs the i-th shield layer inner diameter, liThe length of the ith shielding layer (i is more than or equal to 1 and less than or equal to 4).
(4) Establishing a four-layer magnetic shielding barrel structure model containing all structural parameters influencing magnetic shielding performance and magnetic noise:
wherein DLiFor the axial spacing between the i-th and i + 1-th shield layers, including DL1，DL2，DL3；DRiFor the radial spacing between the i-th and i + 1-th shielding layers, including DR1，DR2，DR3；tiIs the thickness of the ith shielding layer, including t1，t2，t3，t4；
Is the average radius of the innermost layer;
is the average length of the innermost layer. The four-layer magnetic shielding barrel structure can be composed of
t1，t2，t3，t4，DL1，DL2，DL3，DR1，DR2，DR3Determining 12 parameters, i is more than or equal to 1 and less than or equal to 4.
(5) Substituting the structural model of the four-layer magnetic shielding barrel in the step (4) into the total axial magnetic shielding factor model of the four-layer magnetic shielding barrel with the cover in the step (1) to obtain the total axial shielding factor model S 'of the four-layer magnetic shielding barrel with the cover, which contains 12 structural parameters influencing the magnetic shielding performance and the magnetic noise'Atot：
Substituting the structure model of the four-layer magnetic shielding barrel in the step (4) into the magnetic noise model generated by the innermost magnetic shielding barrel in the step (2) to obtain a magnetic noise model delta B ' of the four-layer magnetic shielding barrel with the cover, wherein the magnetic noise model delta B ' comprises 12 structural parameters influencing the magnetic shielding performance and the magnetic noise 'eddy：
Substituting the structural model of the four-layer magnetic shielding barrel in the step (4) into the total volume model of the four-layer magnetic shielding barrel with the cover in the step (3) to obtain a total volume model V ' of the four-layer magnetic shielding barrel with the cover, wherein the total volume model V ' contains 12 structural parameters influencing magnetic shielding performance and magnetic noise 'tot：
(6) Setting four layers of magnetic shielding barrel initial structure parameters, and calculating total axial shielding factor under the structure parameters
Magnetic noise
Total volume
Setting 12 structural parameter variation intervals affecting the magnetic shielding performance and the magnetic noise in the above (4):
(7) is prepared from S 'in the above (5)'AtotAs an optimization target, the method of (6) above
As a constraint condition one, the method as set forth in (6) above
And (3) as a constraint condition II, optimizing 12 structural parameters influencing the magnetic shielding performance and the magnetic noise in the step (4) by adopting a multi-parameter particle swarm algorithm with constraint to obtain the structural parameters of the four-layer magnetic shielding barrel when the axial shielding factor of the four-layer magnetic shielding barrel with the cover is maximum, and marking the structural parameters as the maximum magnetic noise of the four-layer magnetic shielding barrel with the cover under the structural parameters
(8) Delta B 'of the above (5)'eddyAs an optimization target, the method of (6) above
As a constraint condition one, the method as set forth in (6) above
And (3) as a constraint condition II, optimizing 12 structural parameters influencing the magnetic shielding performance and the magnetic noise in the step (4) by adopting a multi-parameter particle swarm algorithm with constraint to obtain a four-layer magnetic shielding barrel structural parameter when the magnetic noise of the four-layer magnetic shielding barrel with the cover is minimum, and marking the four-layer magnetic shielding barrel with the cover as the minimum magnetic noise under the structural parameter
(9) In the above (7)
The above (8)
Constituting a magnetic noise variation interval
Dividing the interval 10 into equal parts
Wherein
(10) Is prepared from S 'in the above (5)'AtotThe optimization objective was to obtain V 'in the above (5)'totAs a constraint one, will
Sequentially serving as a constraint condition II, performing 11 sub-optimization on 12 structural parameters influencing the magnetic shielding performance and the magnetic noise in the step (4) by adopting a multi-parameter particle swarm algorithm with constraint to obtain the j sub-optimized maximum value of the axial shielding factor of the four-layer covered magnetic shielding barrel
The corresponding parameters of the 4-layer magnetic shielding barrel structure are recorded as follows:
substituting the obtained 4-layer magnetic shielding barrel structure parameters into the four-layer magnetic shielding barrel with cover magnetic noise model delta B 'in the step (5)'eddySolving the magnetic noise corresponding to the jth sub-optimization
1≤j≤11。
(11) Sequentially calculating according to 11 sub-optimization results in (10) above
Is recorded as Delta SjSequentially calculate
Is recorded as Delta BjJ is more than or equal to 1 and less than or equal to 10, and calculating delta Sj/ΔδBjPlotting Δ Sj/ΔδBjAnd changing the curve, selecting a maximum point of the curve, wherein 12 structural parameters of the 4 layers of magnetic shielding barrels corresponding to the point are the final optimization result.
Compared with the prior art, the invention has the advantages that:
(1) the magnetic shielding barrel design method comprehensively considers two indexes of magnetic shielding factors and magnetic noise in the design process, and the average length of the innermost layer of the magnetic shielding barrel is calculated by a particle swarm algorithm with multiple constrained parameters
Average radius of innermost layer
Thickness t of each layeriInter-layer axial spacing DLiInter-layer radial spacing DRiThe magnetic noise is effectively reduced while the shielding performance of the magnetic shielding barrel is greatly improved by 12 parameters through optimization design, compared with the magnetic noise before optimization, the axial shielding factor of the optimized magnetic shielding barrel is improved by one order of magnitude, and the magnetic noise is reduced by 15%, so that the design requirements of high shielding performance and low noise can be met simultaneously;
(2) the invention discloses a relation curve of magnetic noise variation and axial magnetic shielding factor variation under different structural parameters in the optimization process of the magnetic shielding barrel, and provides theoretical reference for the optimization design of the magnetic shielding barrel of the atomic spin magnetometer.
Drawings
FIG. 1 is an axial cross-sectional view of a 4-layer magnetic shielding can in accordance with the present invention;
FIG. 2 shows Δ S in the present inventionj/ΔδBjGraph is shown.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1, the magnetic shielding barrel of the present invention specifically includes the following contents:
(1) establishing a four-layer magnetic shielding barrel with a cover total radial magnetic shielding factor model:
establishing a four-layer magnetic shielding barrel total axial magnetic shielding factor model with a cover:
wherein,
is the radial magnetic shielding factor of the ith layer of magnetic shielding barrel,
μiis the permeability of the ith layer of material, fi＝1+Li/100DiEnd cap shielding coefficient of axial shielding factor of i-th layer, DiIs the i-th shield layer outer diameter, LiIs the i-th shielding layer outer length, tiIs the ith shield layer thickness.
(2) Establishing a magnetic noise (eddy current noise) model generated by the innermost magnetic shielding barrel:
wherein mu0＝4π×10-7N/A2Is a vacuum permeability of r1＝D1/2-t1The inner radius of the innermost layer, k is 1.38 × 10-23J/K is Boltzmann constant, T is Kelvin temperature, and sigma is the innermost screenThe conductivity of the shielding material, G, is a coefficient related to the aspect ratio L/D, when L/D is 1, 1.5, 2, G is 0.657, 0.460, 0.438, respectively.
(3) Establishing a total volume model of the four-layer magnetic shielding barrel with the cover:
wherein,
is the volume of the ith layer of magnetic shielding barrel. diIs the i-th shield layer inner diameter, liIs the length in the ith shield layer.
(4) Establishing a four-layer magnetic shielding barrel structure model containing all structural parameters influencing magnetic shielding performance and magnetic noise:
wherein DLiFor the axial spacing between the i-th and i + 1-th shield layers, including DL1，DL2，DL3；DRiFor the radial spacing between the i-th and i + 1-th shielding layers, including DR1，DR2，DR3；tiIs the thickness of the ith shielding layer, including t1，t2，t3，t4；
Is the average radius of the innermost layer;
is the average length of the innermost layer. Four-layer magnetic shielding barrel structure consisting of
t1，t2，t3，t4，DL1，DL2，DL3，DR1，DR2，DR3And 12 parameters are determined.
(5) Substituting the structural model of the four-layer magnetic shielding barrel in the step (4) into the total axial magnetic shielding factor model of the four-layer magnetic shielding barrel with the cover in the step (1) to obtain the total axial shielding factor model S 'of the four-layer magnetic shielding barrel with the cover, which contains 12 structural parameters influencing the magnetic shielding performance and the magnetic noise'Atot：
Substituting the structure model of the four-layer magnetic shielding barrel in the step (4) into the magnetic noise model generated by the innermost magnetic shielding barrel in the step (2) to obtain a magnetic noise (eddy current noise) model delta B ' of the four-layer magnetic shielding barrel with the cover, wherein the model delta B ' contains 12 structural parameters influencing the magnetic shielding performance and the magnetic noise 'eddy：
Substituting the structural model of the four-layer magnetic shielding barrel in the step (4) into the total volume model of the four-layer magnetic shielding barrel with the cover in the step (3) to obtain a total volume model V ' of the four-layer magnetic shielding barrel with the cover, wherein the total volume model V ' contains 12 structural parameters influencing magnetic shielding performance and magnetic noise 'tot：
(6) Setting four layers of magnetic shielding barrel initial structure parameters, and calculating total axial shielding factor under the structure parameters
12 structural parameters (including the innermost layer level) affecting the magnetic shield performance and the magnetic noise in the above (4) were setAverage length
Average radius of innermost layer
Thickness t of each layeriInter-layer axial spacing DLiInter-layer radial spacing DRi) The variation interval:
(7) is prepared from S 'in the above (5)'AtotAs an optimization target, the method of (6) above
As a constraint condition one, the method as set forth in (6) above
And (3) as a constraint condition II, optimizing 12 structural parameters influencing the magnetic shielding performance and the magnetic noise in the step (4) by adopting a multi-parameter particle swarm algorithm with constraint to obtain the structural parameters of the four-layer magnetic shielding barrel when the axial shielding factor of the four-layer magnetic shielding barrel with the cover is maximum, and marking the structural parameters as the maximum magnetic noise of the four-layer magnetic shielding barrel with the cover under the structural parameters
(8) Delta B 'of the above (5)'eddyAs an optimization target, the method of (6) above
As a constraint condition one, the method as set forth in (6) above
As a second constraint condition, optimizing 12 structural parameters influencing the magnetic shielding performance and the magnetic noise in the step (4) by adopting a multi-parameter particle swarm algorithm with constraint to obtain the magnetic noise maximum of the four-layer magnetic shielding barrel with the coverThe structural parameters of the hourly four-layer magnetic shielding barrel are that the magnetic noise of the four-layer magnetic shielding barrel with the cover is minimum under the structural parameters and is recorded as
(9) In the above (7)
The above (8)
Constituting a magnetic noise variation interval
Dividing the interval 10 into equal parts
Wherein
(10) Is prepared from S 'in the above (5)'AtotThe optimization objective was to obtain V 'in the above (5)'totAs a constraint one, will
Sequentially serving as a constraint condition II, performing 11 sub-optimization on 12 structural parameters influencing the magnetic shielding performance and the magnetic noise in the step (4) by adopting a multi-parameter particle swarm algorithm with constraint to obtain the j sub-optimized maximum value of the axial shielding factor of the four-layer covered magnetic shielding barrel
The corresponding parameters of the 4-layer magnetic shielding barrel structure are recorded as follows:
substituting the structural parameters of the 4 layers of magnetic shielding barrels into the magnetic noise model of the four layers of magnetic shielding barrels with covers in the step (5)Type delta B'eddySolving the magnetic noise corresponding to the jth sub-optimization
(1≤j≤11)。
(11) Sequentially calculating according to 11 sub-optimization results in (10) above
Is recorded as Delta SjSequentially calculate
Is recorded as Delta BjJ is more than or equal to 1 and less than or equal to 10, and calculating delta Sj/ΔδBjPlotting Δ Sj/ΔδBjA curve showing the variation of the axial shielding factor as a function of the variation of the magnetic noise, Δ Sj/ΔδBjThe larger the value is, the faster the axial shielding factor is increased, the slower the magnetic noise is increased, and the better the optimization effect of the magnetic shielding barrel is. Selecting Delta Sj/ΔδBjThe maximum point in the curve, this time optimized maximum point is obtained at j ═ 7: delta S7/ΔδB 712220, i.e. step (10) 8 th optimization, the corresponding four-layer magnetic shielding barrel structure parameters are:
the corresponding axial magnetic shielding is:
the magnetic noise is:
obtaining the optimized structural parameters of the four-layer magnetic shielding barrel, and finishing the optimization design.
Therefore, the shielding factor of the magnetic shield bucket after optimization is 2.1350 × 10 compared with that of the magnetic shield bucket before optimization3Increase to 3.8327 × 104Lifting deviceIncreased by one order of magnitude, magnetic noise (eddy current noise)
Reduced to
The reduction is 15%.
As shown in FIG. 2, Δ S plotted according to the present inventionj/ΔδBjGraph with ordinate representing total axial shielding factor variation Δ SjAnd magnetic noise variation amount delta BjThe abscissa is the total axial shielding factor and the magnetic noise change times, the curve reveals the relationship between the axial total shielding factor variation and the magnetic noise variation in the optimization process, and Delta S in the curvej/ΔδBjThe larger the value is, the faster the axial shielding factor is increased, the slower the magnetic noise is increased, the better the optimization effect of the magnetic shielding barrel is, and Delta S is selected in the designj/ΔδBjAnd taking the four-layer magnetic shielding barrel structure corresponding to the maximum point as a final optimization result. The optimization maximum point is obtained at j-7: delta S7/ΔδB 712220, i.e. step (10) 8 th optimization, the corresponding four-layer magnetic shielding barrel structure parameters are:
the corresponding axial magnetic shielding is:
the magnetic noise is:
ΔSj/ΔδBjthe curve chart reveals the relationship between the magnetic noise variation and the axial magnetic shielding factor variation under different structural parameters in the optimization process of the magnetic shielding barrel, and provides theoretical reference for the optimization design of the magnetic shielding barrel of the atomic spin magnetometer.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (2)
1. A design method of a high-performance low-noise magnetic shielding barrel is characterized by comprising the following steps:
(1) establishing a four-layer magnetic shielding barrel with a cover total radial magnetic shielding factor model:
establishing a four-layer magnetic shielding barrel total axial magnetic shielding factor model with a cover:
wherein,
is the radial magnetic shielding factor of the ith layer of magnetic shielding barrel,
μiis the permeability of the ith layer of material, fi＝1+Li/100DiEnd cover shielding coefficient of axial shielding factor of ith layer，DiIs the i-th shield layer outer diameter, LiIs the i-th shielding layer outer length, tiIs the thickness of the ith shielding layer;
(2) establishing a magnetic noise model generated by the innermost magnetic shielding barrel:
wherein, mu0＝4π×10-7N/A2Is a vacuum permeability of r1＝D1/2-t1The inner radius of the innermost layer, k is 1.38 × 10-23J/K is boltzmann constant, T is kelvin temperature, σ is electrical conductivity of the innermost shielding material, G is a coefficient related to aspect ratio L/D, and when L/D is 1, 1.5, 2, G is 0.657, 0.460, 0.438, respectively;
(3) establishing a total volume model of the four-layer magnetic shielding barrel with the cover:
wherein,
is the volume of the i-th layer magnetic shielding barrel, diIs the i-th shield layer inner diameter, liIs the length in the ith shielding layer;
(4) establishing a four-layer magnetic shielding barrel structure model containing all structural parameters influencing magnetic shielding performance and magnetic noise:
wherein DLiFor the axial spacing between the i-th and i + 1-th shield layers, including DL1，DL2，DL3；DRiFor the radial spacing between the i-th and i + 1-th shielding layers, including DR1，DR2，DR3；tiIs the thickness of the ith shielding layer, including t1，t2，t3，t4；
Is the average radius of the innermost layer;
is the average length of the innermost layer. Four-layer magnetic shielding barrel structure consisting of
t1，t2，t3，t4，DL1，DL2，DL3，DR1，DR2，DR3Determining 12 parameters;
(5) substituting the four-layer magnetic shielding barrel structure model in the step (4) into the four-layer covered magnetic shielding barrel total axial magnetic shielding factor model in the step (1) to obtain a four-layer covered magnetic shielding barrel total axial shielding factor model S 'containing 12 structural parameters influencing magnetic shielding performance and magnetic noise'Atot：
Substituting the structure model of the four-layer magnetic shielding barrel in the step (4) into the magnetic noise model generated by the innermost magnetic shielding barrel in the step (2) to obtain a magnetic noise model delta B ' of the four-layer magnetic shielding barrel with the cover, wherein the magnetic noise model delta B ' contains 12 structural parameters influencing the magnetic shielding performance and the magnetic noise 'eddy：
Substituting the four-layer magnetic shielding barrel structure model in the step (4) into the four-layer magnetic shielding barrel structure model in the step (3)Obtaining a total volume model V ' of the four-layer magnetic shielding barrel with the cover, wherein the total volume model V ' contains 12 structural parameters influencing magnetic shielding performance and magnetic noise 'tot：
(6) Setting four layers of magnetic shielding barrel initial structure parameters, and calculating total axial shielding factor under the structure parameters
Setting 12 structural parameter change intervals influencing magnetic shielding performance and magnetic noise in the step (4):
(7) is prepared from S 'in step (5)'AtotAs an optimization target, the step (6) is
As a constraint condition one, the step (6)
And (2) as a constraint condition II, optimizing 12 structural parameters influencing the magnetic shielding performance and the magnetic noise in the step (4) by adopting a multi-parameter particle swarm algorithm with constraint to obtain the structural parameters of the four-layer magnetic shielding barrel when the axial shielding factor of the four-layer magnetic shielding barrel with the cover is maximum, and marking the structural parameters as the maximum magnetic noise of the four-layer magnetic shielding barrel with the cover under the structural parameters
(8) By delta B 'in step (5)'eddyAs an optimization target, the step (6) is
As a constraint condition one, the step (6)
And (2) as a constraint condition II, optimizing 12 structural parameters influencing the magnetic shielding performance and the magnetic noise in the step (4) by adopting a multi-parameter particle swarm algorithm with constraint to obtain a four-layer magnetic shielding barrel structural parameter when the magnetic noise of the four-layer magnetic shielding barrel with the cover is minimum, and marking the four-layer magnetic shielding barrel with the cover as the minimum magnetic noise under the structural parameter
(9) In step (7)
And in step (8)
Constituting a magnetic noise variation interval
Dividing the interval 10 into equal parts
Wherein
(10) Is prepared from S 'in step (5)'AtotAs an optimization target, V 'in the step (5)'totAs a constraint one, will
Sequentially serving as constraint conditions II, wherein j is more than or equal to 1 and less than or equal to 11; performing 11 sub-optimization on 12 structural parameters influencing the magnetic shielding performance and the magnetic noise in the step (4) by adopting a multi-parameter particle swarm algorithm with constraint to obtain the jth sub-optimized fourAxial shielding factor maximum value of magnetic shielding barrel with cover
The corresponding parameters of the 4-layer magnetic shielding barrel structure are recorded as follows:
substituting the obtained 4-layer magnetic shielding barrel structure parameters into the four-layer magnetic shielding barrel with cover magnetic noise model delta B 'in the step (5)'eddySolving the magnetic noise corresponding to the jth sub-optimization
1≤j≤11；
(11) According to 11 suboptimal results in the step (10), calculating in sequence
Is recorded as Delta SjSequentially calculate
Is recorded as Delta BjJ is more than or equal to 1 and less than or equal to 10, and calculating delta Sj/ΔδBjPlotting Δ Sj/ΔδBjAnd changing the curve, selecting a maximum point of the curve, wherein 12 structural parameters of the 4 layers of magnetic shielding barrels corresponding to the point are the final optimization result.
2. The design method of a high-performance low-noise magnetic shielding barrel according to claim 1, characterized in that: the four layers of magnetic shielding barrels are made of permalloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111518732.6A CN114169246B (en) | 2021-12-13 | 2021-12-13 | Design method of high-performance low-noise magnetic shielding barrel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111518732.6A CN114169246B (en) | 2021-12-13 | 2021-12-13 | Design method of high-performance low-noise magnetic shielding barrel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114169246A true CN114169246A (en) | 2022-03-11 |
| CN114169246B CN114169246B (en) | 2023-04-07 |
Family
ID=80486275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111518732.6A Active CN114169246B (en) | 2021-12-13 | 2021-12-13 | Design method of high-performance low-noise magnetic shielding barrel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114169246B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120035893A1 (en) * | 2010-08-09 | 2012-02-09 | Xi'an University Of Technology | Method of three-dimensional optimization design for asymmetric cusp magnetic field in mcz single crystal furnace |
| CN103870701A (en) * | 2014-03-24 | 2014-06-18 | 东南大学 | Optimal modeling method for magnetic shielding barrel parameters of atom magnetometer/atom gyroscope |
| CN106845045A (en) * | 2017-04-11 | 2017-06-13 | 中国科学院上海微系统与信息技术研究所 | The method for designing and system of a kind of magnetic shield room |
| CN108107390A (en) * | 2017-12-29 | 2018-06-01 | 鑫高益医疗设备股份有限公司 | A kind of optimum design method of superconducting magnet external magnetism shielding coil |
| CN111031775A (en) * | 2019-12-27 | 2020-04-17 | 北京航空航天大学 | Novel multilayer strip winding type low-noise permalloy magnetic shielding barrel structure |
| CN112469257A (en) * | 2020-10-14 | 2021-03-09 | 北京航空航天大学 | Iron-based amorphous material electromagnetic shielding barrel with low noise and high shielding coefficient |
| CN113343551A (en) * | 2021-06-30 | 2021-09-03 | 北京航空航天大学 | Cylindrical and spherical uniform magnetic field coil design method based on magnetic shielding cylinder coupling |
| CN113361146A (en) * | 2021-07-21 | 2021-09-07 | 国网江西省电力有限公司供电服务管理中心 | Improved particle swarm optimization-based manganese-copper shunt structure parameter optimization method |
-
2021
- 2021-12-13 CN CN202111518732.6A patent/CN114169246B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120035893A1 (en) * | 2010-08-09 | 2012-02-09 | Xi'an University Of Technology | Method of three-dimensional optimization design for asymmetric cusp magnetic field in mcz single crystal furnace |
| CN103870701A (en) * | 2014-03-24 | 2014-06-18 | 东南大学 | Optimal modeling method for magnetic shielding barrel parameters of atom magnetometer/atom gyroscope |
| CN106845045A (en) * | 2017-04-11 | 2017-06-13 | 中国科学院上海微系统与信息技术研究所 | The method for designing and system of a kind of magnetic shield room |
| CN108107390A (en) * | 2017-12-29 | 2018-06-01 | 鑫高益医疗设备股份有限公司 | A kind of optimum design method of superconducting magnet external magnetism shielding coil |
| CN111031775A (en) * | 2019-12-27 | 2020-04-17 | 北京航空航天大学 | Novel multilayer strip winding type low-noise permalloy magnetic shielding barrel structure |
| CN112469257A (en) * | 2020-10-14 | 2021-03-09 | 北京航空航天大学 | Iron-based amorphous material electromagnetic shielding barrel with low noise and high shielding coefficient |
| CN113343551A (en) * | 2021-06-30 | 2021-09-03 | 北京航空航天大学 | Cylindrical and spherical uniform magnetic field coil design method based on magnetic shielding cylinder coupling |
| CN113361146A (en) * | 2021-07-21 | 2021-09-07 | 国网江西省电力有限公司供电服务管理中心 | Improved particle swarm optimization-based manganese-copper shunt structure parameter optimization method |
Non-Patent Citations (2)
| Title |
|---|
| 吕志峰;张金生;王仕成;李婷;: "基于自适应权重PSO算法的磁屏蔽装置优化设计" * |
| 甘明刚;陈杰;蔡涛;潘峰;: "多层平板屏蔽体的多目标优化设计" * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114169246B (en) | 2023-04-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2276082B1 (en) | Magneto-sensitive wire, magneto-impedance element and magneto-impedance sensor | |
| CN114169246B (en) | Design method of high-performance low-noise magnetic shielding barrel | |
| Kachniarz et al. | Study on the Rayleigh hysteresis model and its applicability in modeling magnetic hysteresis phenomenon in ferromagnetic materials | |
| CN101339580B (en) | Discrete optimizing method for magnetic resonance image-forming superconducting magnet design | |
| Mu et al. | Relu cascade of feature pyramid networks for CT pulmonary nodule detection | |
| EP1898228A2 (en) | Antenna coil for nmr with reduced magnetic susceptibility | |
| CN112469257A (en) | Iron-based amorphous material electromagnetic shielding barrel with low noise and high shielding coefficient | |
| Miles et al. | Contributors to fluxgate magnetic noise in permalloy foils including a potential new copper alloy regime | |
| Barnes et al. | Critical currents in the superconducting surface sheath | |
| Fabbricatore et al. | Ac losses in multifilamentary high-TC tapes due to a perpendicular ac magnetic field | |
| Wang et al. | Optimal design for high-field MRI superconducting magnet | |
| Jian et al. | Improving the malignancy characterization of hepatocellular carcinoma using deeply supervised cross modal transfer learning for non-enhanced MR | |
| CN114200368B (en) | Design method of axial shimming coil in magnetic shielding cylinder | |
| Tamegai et al. | Fabrication of Small Magnets Using Mono-and Seven-Core (Ba, A) Fe 2 As 2 (A: K, Na) HIP Round Wires | |
| Xu et al. | Significant reduction in the low-field magnetization of Nb3Sn superconducting strands using the internal oxidation APC approach | |
| Garber et al. | Effect of Cu4Ti compound formation on the characteristics of NbTi accelerator magnet wire | |
| Bettini et al. | Iterative Axisymmetric Identification Algorithm (IAIA) for real-time reconstruction of the plasma boundary of ITER | |
| Zhang et al. | Quantitative detection of remanence in broken wire rope based on adaptive filtering and Elman neural network | |
| CN116298469B (en) | Closed-loop AC/DC sensor and design method thereof | |
| Ochiai et al. | Dependence of critical current on voltage probe spacing in superconducting tape with multiple small cracks and a large crack | |
| Steppke et al. | Application of LTS-SQUIDs in nuclear measurement techniques | |
| CN105891750A (en) | High-field MRI birdcage coil | |
| Ounadjela et al. | Effect of surface composition observed by Auger electron spectroscopy on magnetization and magnetostriction of NiFe and NiFeRh thin films | |
| JP2009175081A (en) | Antenna coil for nmr, low magnetism superconductive filament used for it, its manufacturing method, magnetic susceptibility adjusting method, and nmr system | |
| Kang et al. | Radial magnetic field reduction to improve critical current of HTS solenoid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |