Numerical Investigations on Magnetic Shielding Performance of High-Tc Superconductor
高温超导体磁屏蔽性能的数值研究
基本信息
- 批准号:11834004
- 负责人:
- 金额:$ 2.18万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:1999
- 资助国家:日本
- 起止时间:1999 至 2000
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The magnetic shielding performance of the high-Tc superconductor (HTS) has been investigated numerically. In order to reproduce the crystallographic anisotropy in the critical current density of the MPMG-YBCO superconductor, the multiple-thin-layer approximation is assumed. Under the assumption, the behavior of the shielding current density is described by the integral-differential equation and the J-E constitutive relation. As the relation, the flux-flow and flux-creep model is adopted. Futhermore, the Kim model and the Bardeen-Stephan model are employed for the description of the B-dependence of the critical current density J_C and the flow resistivity ρ_f.When discretized by means of the FEM and the θ-method, the initial-boundary-value problem of the governing equation is reduced to the nonlinear system G(s)=0. As the method for solving the system, the successive substitution method and the deaccelerated Newton method (DNM) have been employed. However, once the B-dependence of J_C and ρ_f is taken into account, it costs much CPU time to obtain the converged solutions. This is because the time step size and the relaxation factor must be taken so small to ensure the convergence. In order to overcome these difficulties, the DNM is modified so that the residual norm may decrease monotonously with respect to the iteration number. As a result, the total iteration number of the modified method is 1/230〜1/6 times as much as that of the DNM.A numerical code for analyzing the time evolution of the shielding current density has been developed by use of the modified method and, by use of the code, the magnetic shielding performance of the HIS plate is investigated. From the results of computations, it turns out that the HTS plate has a shielding ability against high-frequency magnetic fields even if it remains in a mixed state.
为了再现 MPMG-YBCO 超导体临界电流密度下的晶体各向异性,对高温超导体 (HTS) 的磁屏蔽性能进行了数值研究,假设采用多重薄层近似。 ,屏蔽电流密度的行为由积分微分方程和 J-E 本构关系描述,磁通-流动和磁通-蠕变模型为此外,采用Kim模型和Bardeen-Stephan模型来描述临界电流密度J_C和流阻率ρ_f的B依赖性。通过有限元和θ方法离散,得到初始值。 -将控制方程的边值问题简化为非线性系统G(s)=0 作为求解系统的方法,有逐次代入法和减速牛顿法(DNM)。然而,一旦考虑到 J_C 和 ρ_f 的 B 相关性,就需要花费大量的 CPU 时间来获得收敛解,这是因为时间步长和松弛因子必须取得很小才能确保收敛。为了克服这些困难,对DNM进行了修改,使得残差范数可以相对于迭代次数单调递减,结果,修改后的方法的总迭代次数是原来的1/230到1/6倍。作为利用改进的方法开发了用于分析屏蔽电流密度随时间变化的数值代码,并利用该代码根据结果研究了 HIS 板的磁屏蔽性能。计算结果表明,即使处于混合状态,高温超导板也具有对高频磁场的屏蔽能力。
项目成果
期刊论文数量(32)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A.Kamitani: "Influence of Magnetic-Field Dependence of JC and rf on Magnetic Shielding Performance of HTS Plates"Advances in Superconductivity. 12. 869-871 (2000)
A.Kamitani:“JC 和 rf 的磁场依赖性对 HTS 板磁屏蔽性能的影响”超导进展。
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- 影响因子:0
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A.Kamitani: "Numerical Method for Determination of Shielding Current Density in Axisymmetric HTS Plates under AC Magnetic Field"Physica C. (In Press). (2001)
A.Kamitani:“交流磁场下轴对称高温超导板屏蔽电流密度的数值测定方法”Physica C.(正在出版)。
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- 影响因子:0
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S.Ikuno: "Numerical Solution for Hybrid of Homogeneous and Inhomogeneous Linear Elliptic PDEs-Application of Combination Method of FDM and BEM- "NIFS-PROC. 40. 72-81 (1999)
S.Ikuno:“齐次和非齐次线性椭圆偏微分方程的混合数值解-FDM和BEM组合方法的应用-”NIFS-PROC。
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- 影响因子:0
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A.Kamitani : "Magnetic Shielding Analysis of HTS Plates by Flux Flow Creep Model"Advances in Superconductivity. 11. 1455-1458 (1999)
A.Kamitani:“通过磁通流蠕变模型对 HTS 板进行磁屏蔽分析”超导性的进展。
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- 影响因子:0
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T.Yokono: "Dependence of Spatial Distribution of Shielding Current Density in HTS Plate on Applied Magnetic Field Profile"IEEE Tran.Appl.Superconductivity. (In Press). (2001)
T.Yokono:“HTS 板中屏蔽电流密度的空间分布对应用磁场分布的依赖性”IEEE Tran.Appl.Superconductivity。
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KAMITANI Atsushi其他文献
Improved Variable-Reduction Method and Its Variant for Solving Asymmetric EFG-Type Saddle-Point Problem
求解非对称EFG型鞍点问题的改进变量归约法及其变体
- DOI:
- 发表时间:
2023 - 期刊:
- 影响因子:0.8
- 作者:
KAMITANI Atsushi;TAKAYAMA Teruou - 通讯作者:
TAKAYAMA Teruou
Multi-Objective Optimization of Superconducting Linear Acceleration System for Pellet Injection by Using Finite Element Method
颗粒注射超导线性加速系统有限元多目标优化
- DOI:
10.1585/pfr.16.2401025 - 发表时间:
2021 - 期刊:
- 影响因子:0.8
- 作者:
TAKAYAMA Teruou;YAMAGUCHI Takazumi;SAITOH Ayumu;KAMITANI Atsushi;NAKAMURA Hiroaki - 通讯作者:
NAKAMURA Hiroaki
Hybrid Method Incorporated with Meshless Approach for Electromagnetic Wave Simulation
与无网格方法相结合的电磁波仿真混合方法
- DOI:
10.1585/pfr.15.2401026 - 发表时间:
2020 - 期刊:
- 影响因子:0.8
- 作者:
SAITOH Ayumu;YAMAGUCHI Takazumi;KAMITANI Atsushi;NAKAMURA Hiroaki - 通讯作者:
NAKAMURA Hiroaki
Multi-Objective Optimization of Superconducting Linear Acceleration System for Pellet Injection by Using Finite Element Method
颗粒注射超导线性加速系统有限元多目标优化
- DOI:
10.1585/pfr.16.2401025 - 发表时间:
2021 - 期刊:
- 影响因子:0.8
- 作者:
TAKAYAMA Teruou;YAMAGUCHI Takazumi;SAITOH Ayumu;KAMITANI Atsushi;NAKAMURA Hiroaki - 通讯作者:
NAKAMURA Hiroaki
Acceleration Techniques for Linear-System Solver in Shielding Current Analysis of Cracked HTS Film
裂纹高温超导薄膜屏蔽电流分析中线性系统求解器的加速技术
- DOI:
10.1585/pfr.16.2405005 - 发表时间:
2021 - 期刊:
- 影响因子:0.8
- 作者:
KAMITANI Atsushi;TAKAYAMA Teruou;SAITOH Ayumu;NAKAMURA Hiroaki - 通讯作者:
NAKAMURA Hiroaki
KAMITANI Atsushi的其他文献
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{{ truncateString('KAMITANI Atsushi', 18)}}的其他基金
High-Performance Computational Techniques for Practical Electromagnetic-Field Analysis in High-Temperature Superconductor
高温超导体实用电磁场分析的高性能计算技术
- 批准号:
24560321 - 财政年份:2012
- 资助金额:
$ 2.18万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Development of High-Performance Electromagnetic Analysis for Design of Engineering Application of High-Temperature Superconductor
高温超导体工程应用设计高性能电磁分析的发展
- 批准号:
21560287 - 财政年份:2009
- 资助金额:
$ 2.18万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Development of Fast Numerical Methods for Electromagnetic Analysis in High-Temperature Superconductors
高温超导体电磁分析快速数值方法的发展
- 批准号:
19560276 - 财政年份:2007
- 资助金额:
$ 2.18万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Time Domain Analysis on Magnetic Shielding Performance of YBCO Superconductor
YBCO超导体磁屏蔽性能时域分析
- 批准号:
13650297 - 财政年份:2001
- 资助金额:
$ 2.18万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
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