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Efficient numerical calculation method of high frequency electromagnetic fields in large-scale low-loss cavities and reverberation chambers

Research Project

Project/Area Number 16K05040
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Computational science
Research InstitutionKansai University (2018)
Kyoto University (2016-2017)

Principal Investigator

Hamada Shoji  関西大学, システム理工学部, 教授 (20246656)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords電磁界解析 / 反復解法 / 収束性 / 悪条件問題 / 残差切除法 / モーメント法 / 高周波 / 反射箱 / 電磁界 / 電界積分方程式 / 高速多重極法 / 計算物理 / 大規模解析 / 密閉領域
Outline of Final Research Achievements

We conducted research on the convergence property of the iterative solvers for analyses of electromagnetic fields in lossless cubic cavities by the method of moments. We increased the cavity side length from approximately 1 to 53.6 wavelengths, and the convergence of the iterative solvers in large-scale cavity problems was investigated. We proposed extended versions of the residual cutting method, which improves the convergence of iterative solvers, and we applied them to an iterative solver called BiCGSafe method. These extended versions improved the convergence of ill-conditioned problems up to about 8.5 times, and in some cases, these extended versions achieved convergence even when the BiCGSafe method didn’t converge. We also verified that Calderon preconditioner can be used with these extended versions and that this preconditioner is effective to the cavity problems.

Academic Significance and Societal Importance of the Research Achievements

低損失密閉環境中および反射箱中の高周波電磁界は、生体影響や電子機器影響の観点から重要な場だが、大規模高速高精度計算が困難な計算対象の一つである。本研究により大規模解析の難易度を低下させることができ、生体影響や電子機器影響の検討がより容易になった。一方、残差切除法は任意の反復解法および任意の前処理手法と併用可能な収束性改善法であり、その改良法を提案できたことは、悪条件問題を反復解法で扱っている様々な分野の問題に対し、新たな収束性改善策の候補を提供できたといえる。個別問題に対する有効性は、実際に適用してみないと分からないが、様々な分野への適用と有効性の検証という課題が新たに生まれたともいえる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (6 results)

All 2018 2017 2016

All Presentation (6 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] 導体空洞内電磁界のモーメント法解析のための残差切除法の拡張手法2018

    • Author(s)
      濱田昌司
    • Organizer
      電気学会電磁環境研究会 EMC-18-090
    • Related Report
      2018 Annual Research Report
  • [Presentation] 三次元直交等間隔格子上磁界分布の効率的計算法2018

    • Author(s)
      濱田昌司
    • Organizer
      平成30年電気学会全国大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 複数の近似解を用いる残差切除法のモーメント法への適用2017

    • Author(s)
      濱田昌司
    • Organizer
      平成29年電気学会全国大会
    • Place of Presentation
      富山大学五福キャンパス
    • Year and Date
      2017-03-15
    • Related Report
      2016 Research-status Report
  • [Presentation] 複数の近似解を用いる残差切除法とCalderon前処理とを併用するモーメント法2017

    • Author(s)
      濱田昌司
    • Organizer
      平成29年電気学会基礎・材料・共通部門大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Improving convergence of iterative solvers using re-sidual cutting method to solve electromagnetic fields in lossless cavity by method of moments2016

    • Author(s)
      Shoji Hamada
    • Organizer
      35th JSST annual conference international conference on simulation technology (JSST2016)
    • Place of Presentation
      Kyoto University
    • Year and Date
      2016-10-27
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 電界積分方程式に基づく高速多重極MoM解析における反復解法の収束特性2016

    • Author(s)
      濱田昌司
    • Organizer
      平成28年電気学会基礎・材料・共通部門大会
    • Place of Presentation
      九州工業大学戸畑キャンパス
    • Year and Date
      2016-09-05
    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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