Optimization design algorithm of superconducting magnet external magnetism shielding coil

A superconducting magnet, optimized design technology, applied in the measurement of magnetic variables, measurement devices, instruments, etc.

Active Publication Date: 2010-10-06
宁波健信超导科技股份有限公司
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However, for electromagnetic interference of 1Hz and b

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  • Optimization design algorithm of superconducting magnet external magnetism shielding coil
  • Optimization design algorithm of superconducting magnet external magnetism shielding coil
  • Optimization design algorithm of superconducting magnet external magnetism shielding coil

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[0053] The present invention will be further described below in conjunction with the drawings:

[0054] The detailed algorithm structure is as follows:

[0055] (1) Given initial value S 0 ={x 0，1 , X 0，2 ,..., x 0，n }

[0056] (2) Calculate x i+1, j = X i, j ±Δ i, j

[0057] (3) Evaluate the optimization evaluation standard function Φ. For the optimization evaluation standard function with n degrees of freedom, 2n calculations are required.

[0058] Φ i+1 =min(F(x i+1，1 , X i+1，2 ,..., x i+1, n ,..., x i+1, 2n )), if Φ i+1 i , Then Δ i+1, j =Δ i, j *α, otherwise Δ i+1, j =Δ i, j / α, jump to (2);

[0059] (4) If the optimization evaluation standard function meets the requirements, there is Φ i+1 i+1 ,: <β, optimization failed. Exit the loop.

[0060] Taking the design of the outer magnetic shielding coil of the 1.5T superconducting nuclear magnetic resonance instrument as an example, the detailed implementation process of using this algorithm to optimize the design is as follows:

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Abstract

The invention provides a simple and effective multi-parameter optimization algorithm without interval limitation, in particular to an optimization design algorithm of a superconducting magnet external magnetism shielding coil, which is used for the design of the superconducting magnet external magnetism shielding coil. The invention changes all parameters related to the design of the superconducting magnet external magnetism shielding coil one by one according to the optimization results on the basis of an initial value, in addition, constraint conditions are taken into consideration during the result evaluation, and the coefficients are regulated and changed according to the condition whether the results are optimized or not, so the optimization of the design parameters is realized.

Description

technical field [0001] Based on the large-scale and high-speed computing capabilities of computers, the present invention proposes a simple and effective multi-parameter optimization algorithm without interval restrictions, specifically an optimal design algorithm for external magnetic shielding coils of superconducting magnets for use in superconducting magnets. The design of the magnetomagnetic shielding coil. The optimal design algorithm of the present invention is not limited to the optimal design of the external magnetic shielding coil in the superconducting magnet, and can also be used in any other occasions requiring parameter optimization. Background technique [0002] At present, the overall nuclear magnetic resonance imaging system can apply a special variable magnetic field to a certain part of the human body according to the characteristics of the micro-magnetism of the nucleus of the cell, and then observe the state changes of a certain atom in the magnetic fiel...

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Application Information

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IPC IPC(8): G01R33/421
Inventor 莫磊史永凌赵华炜
Owner 宁波健信超导科技股份有限公司
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