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Detection of the Non-Gaussian Phenomena in Civil Engineering Field and Development of Their Analytical Methods

Research Project

Project/Area Number 21K04242
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22020:Structure engineering and earthquake engineering-related
Research InstitutionKobe Gakuin University

Principal Investigator

SATO Tadanobu  神戸学院大学, 現代社会学部, 研究員 (00027294)

Co-Investigator(Kenkyū-buntansha) 木本 和志  岡山大学, 環境生命科学学域, 准教授 (30323827)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords非ガウス現象 / アンラップ操作を行わない地震動位相の計算法 / 位相平均勾配の確率特性 / フーリエ変換実数部のモデル化 / 因果性に基づく虚数部の再現 / ヒル ベルト変換 / 観測記録からの確率特性の抽出 / 多数の加速度時刻歴の模擬 / 地震動位相の計算法 / ヒルベルト変換 / 実数部の確率特性と不確実性 / 自己回帰過程 / 因果性 / 虚数部の再現 / フーリエ逆変換 / 加速度時刻歴の模擬 / 非ガウス事象 / 確率過程 / 地震動位相 / 劣化過程 / 非正規確率微分方程式
Outline of Research at the Start

土木工学における非正規確率現象を抽出・解析するための方法論を開発する。研究主題は四課題からなる。第一課題では、地震動位相を確率過程として模擬する方法論を確立し、地震動時刻歴のジャークの共分散行列が長期記憶過程であることを明かにする。さらに、地震動時刻歴を、相関性を有する非ガウス確率過程として、模擬する方法論を構築する。第二課題は、構造物の劣化過程を追跡できる確率過程の構成法の研究で、レヴィフライトノイズ過程を駆動項とする確率微分方程式の構成法を展開する。第三課題では、得られた成果を用い、土木構造物の新しいアセット評価法を開発する。第四課題は岩石媒質中を伝播する弾性波の計測実験である。

Outline of Final Research Achievements

The purpose of this research is to discover non-Gaussian phenomena and a method for analyzing the discovered phenomena. We have developed a stochastic process transcend the modern stochastic theory. As a representative of non-Gaussian phenomena we concentrate on the earthquake motion phase, first we develop a method to obtain the continuous phase with respect to the circular frequency without unwrap procedure. Then we define the mean phase gradient (MPG), which is approximation of a group delay time. Regardless of the interval of circular frequency the probability density function (PDF) of MPG is expressed by a unique PDF expressed by the Levy-flight distribution, which means the MGP has a fractal characteristic.
We develop a new stochastic process, in which the PDF of MGP obeys to the Levy-flight distribution. To do this we also defined the Levy-flight nose process.

Academic Significance and Societal Importance of the Research Achievements

本研究は、土木工学における非ガウス現象を抽出し、その模擬法を確立することにある。もし成功すれば、物理や工学現象の世界における新しい事象の解明に画期的な成果になるとともに、今後の物理・工学事象の解明に広く利用されることになる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (17 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (2 results) Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (12 results) (of which Int'l Joint Research: 7 results)

  • [Int'l Joint Research] 東南大学/土木工学科(中国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] 東南大学/大学院工学研究科/土木工学専攻(中国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] ウェーブレット変換と地震記録の確率特性を用いた地震動算定手法の提案2024

    • Author(s)
      杉山祐樹・佐藤忠信・坂井公俊・室野剛隆
    • Journal Title

      土木学会論文集A1(構造・地震工学)Vol.80,No.4(地震工学論文集第43巻)

      Volume: Vol.80,No.4

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] MODELING OF THE NONSTATIONARY BEHAVIOR AND STOCHASTIC CHARACTER WITH RESPECT TO A REAL PART OF FOURIER TRANSFORM OF ACCELERATION RECORD2022

    • Author(s)
      杉山 佑樹, 佐藤 忠信, 室野 剛隆, 坂井 公俊
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))

      Volume: 78 Issue: 4 Pages: I_459-I_467

    • DOI

      10.2208/jscejseee.78.4_I_459

    • ISSN
      2185-4653
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] MODELING THE REAL PART OF FOURIER TRANSFORM OF CAUSAL ACCELERATION TIME HISTORY—SIMULATION OF A CAUSAL ACCELERATION TIME HISTORY BY REPRODUCTION OF THE IMAGINARY PART BASED ON THE HILBERT TRANSFORM—2022

    • Author(s)
      佐藤 忠信, 杉山 佑樹, 室野 剛隆, 坂井 公俊
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))

      Volume: 78 Issue: 2 Pages: 203-212

    • DOI

      10.2208/jscejseee.78.2_203

    • ISSN
      2185-4653
    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] ON A NEW NON-GAUSSIAN PHENOMENON IN THE EARTHQUAKE MOTION PHASE OBTAINED FROM OBSERVED ACCELERATION TIME,2024

    • Author(s)
      Tadanobu SATO
    • Organizer
      18th world conference of Earthquake Engineering,Milan,Italy.
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ウェーブレット変換と地震記録の確率特性を用いた地震動算定手法の提案2024

    • Author(s)
      杉山祐樹・佐藤忠信・坂井公俊・室野剛隆
    • Organizer
      地震工学研究発表会、東京
    • Related Report
      2023 Annual Research Report
  • [Presentation] 地震加速度時刻歴を入力とする構造系の新しい信頼解析法(シンポジウム講演概要)2024

    • Author(s)
      佐藤忠信
    • Organizer
      第27回応用力学シンポジュウム、岡山
    • Related Report
      2023 Annual Research Report
  • [Presentation] A non-Gaussian algorithm to simulate the earthquake motion phase difference.2023

    • Author(s)
      Tadanobu SATO
    • Organizer
      8th International symposium on life-cycle civil engineering,Milan, Italy
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 土木工学分野における新しい非ガウス現象について(シンポジュウム講演概要)2023

    • Author(s)
      佐藤忠信
    • Organizer
      第26回応用力学シンポジュウム、東京
    • Related Report
      2023 Annual Research Report
  • [Presentation] A non-Gaussian algorithm to simulate the earthquake motion phase difference2023

    • Author(s)
      Tadanobu SATO
    • Organizer
      IALCCE2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 土木工学分野における新しい非ガウス現象について(シンポジュウム講演概要)2023

    • Author(s)
      佐藤忠信
    • Organizer
      第26回応用力学シンポジュウム
    • Related Report
      2022 Research-status Report
  • [Presentation] Simulation of Design Response Compatible Acceleration Time Histories Considering the Fourier Phase Uncertainty and Their Application for Dynamic Analysis of Structure System2022

    • Author(s)
      Tadanobu SATO
    • Organizer
      ISRERM2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] SIMULATION OF MANY ACCELERATION TIME HISTORIES WITH CAUSARITY FROM AN OBSERVED EARTHQAKE MOTION―Modeling of real part and reproduction of imaginary part by Hilbert transform―2022

    • Author(s)
      Tadanobu SATO
    • Organizer
      SEMC2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Simulation of Design Response Compatible Acceleration Time Histories Considering the Fourier Phase Uncertainty and Their Application for Dynamic Analysis of Srtucture System2022

    • Author(s)
      Tadanobu SATO
    • Organizer
      The International Symposium on Reliability Engineering and Risk Management (ISRERM/SM9) Hanover 9/2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] SIMULATION OF MANY ACCELERATION TIME HISTORIES WITH CAUSARITY FROM AN OBSERVED EARTHQAKE MO-TION ―Modeling of real part and reproduction of imaginary part by Hilbert transform―2022

    • Author(s)
      Tadanobu SATO
    • Organizer
      8th International Conference on Structural Engineering, Mechanics and Computation(SEMC2022/SS12) Cape Town 9/2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 加速度時刻歴のフーリエ変換実数部における非定常性のモデル化と確率特性の抽出2021

    • Author(s)
      杉山祐樹・佐藤忠信・室野剛隆・坂井公俊
    • Organizer
      第41回地震工学研究D13-2344
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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