Nested Magnetic Shield Design Optimization
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Solution Overview
Problem
Current magnetic shielding apparatuses with open ends experience a deterioration in magnetic shielding performance due to the lack of optimization in geometric structure parameters, particularly when transitioning from closed to open configurations, leading to reduced effectiveness in creating a controlled weak magnetic field environment.
Innovation Solution
A method for designing a magnetic shielding apparatus involves determining a region of interest and a complete parameter set to optimize the geometric structure of N layers of shields, using a derivative-free optimization model to adjust parameters such as layer thickness, spacing, and material distribution, ensuring the magnetic flux density meets a preset threshold, thereby enhancing shielding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical magnetic shield with both ends closed is used, then good magnetic shielding performance is achieved, but processing difficulty increases and manufacturing complexity rises
Solution Approach 1:
The magnetic shield is divided into multiple segments along its length, with at least one segment being removable or open-ended. This segmentation allows the shield to maintain the protective enclosure for magnetic field shielding while enabling easier assembly, disassembly, and access to the interior space, thereby resolving the contradiction between shielding performance and manufacturing ease.
Solution Approach 2:
The patent employs a multi-layer nested structure where multiple magnetic shield layers are positioned concentrically within each other. This nested configuration maximizes the magnetic shielding effect through multiple barriers while maintaining a compact overall structure that is easier to manufacture and assemble compared to solid monolithic shields.
2Ease of operation
If one end of the cylindrical magnetic shield is opened, then accessibility and ease of operation improve, but magnetic shielding performance deteriorates
Solution Approach 1:
The magnetic shield structure implements local quality by providing different characteristics at different locations: the majority of the shield maintains a closed structure for optimal magnetic shielding, while specific localized regions (one end) are opened or made accessible. This allows the shield to simultaneously achieve good overall shielding performance while providing necessary access points for operation and maintenance.
Solution Approach 2:
The patent introduces asymmetry by configuring the cylindrical shield with one closed end and one open end, rather than symmetric closed-closed or open-open configurations. This asymmetric design optimizes both shielding performance and operational accessibility, allowing the shield to function effectively while enabling easy access from one side for experimental setup or maintenance activities.
3Ease of manufacture
If equal spacing between shield layers is used, then manufacturing simplicity is maintained, but magnetic shielding performance is suboptimal
Solution Approach 1:
The patent optimizes the spacing parameters between adjacent magnetic shield layers by calculating and implementing non-uniform spacing configurations. Instead of equal spacing, the distances between layers are specifically designed and adjusted to maximize magnetic shielding effectiveness, with closer spacing in regions of higher magnetic field intensity and larger spacing where less shielding is needed, thereby achieving superior overall performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optimized design significantly improves magnetic shielding performance, increasing the shielding factor by more than five times compared to equal-spacing solutions, while maintaining a controlled environment for experiments and measurements, such as magnetocardiograms and magnetoencephalograms.
Implementation Method 1
a recognized implementation method is to use a high-permeability magnetic material to construct a multi-layer shielding cavity, so as to form a magnetic shielding apparatus
Data Source
AI summary
Disclosed are a method and an apparatus for designing a magnetic shielding apparatus and a magnetic shielding apparatus. The method includes: determining a region of interest inside the magnetic shielding apparatus, the region of interest being a region where a magnetic shielding effect is expected to be achieved, and the magnetic shielding apparatus including N layers of shields disposed in a nested manner; determining a complete parameter set; and obtaining, based on the complete parameter set, a set of result parameters for describing the geometric structure, the set of result parameters that enables magnetic flux density in the region of interest to meet a preset threshold. This method not only greatly improves optimized magnetic shielding performance compared with an equal-spacing solution, but also resolves a problem that an analytical method cannot be used to optimize a magnetic shielding apparatus with a non-concentric structure.