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1992 Fiscal Year Final Research Report Summary

Optimization of Cathodic protection system by Boundary Element Method

Research Project

Project/Area Number 03555014
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 機械材料工学
Research InstitutionTokyo Institute of Technology

Principal Investigator

AOKI Shigeru  Tokyo Institute of Technology Professor, 工学部, 教授 (90016436)

Co-Investigator(Kenkyū-buntansha) MIYASAKA Matsuho  Ebara Research Co. Ltd. Chief Researcher, 流体研究所, 主任研究員
Project Period (FY) 1991 – 1992
KeywordsCathodic Protection / Optimum Design / Boundary Element Method / Sensitivity Analysis / Effective Method of Corrosion Analysis / Inverse Analysis / Fuzzy Set / Identification of Paint Defect
Research Abstract

A boundary element method for determining the optimum impressed current densities and optimum location of electrode in a cathodic protection system was developed. The potential within the electrolyte was described by poison's equation with nonlinear boundary conditions which were enforced based on experimentally determined electrochemical polarization curves. The optimum impressed current densities were determined in order to minimize the power supply for protection under the protecting conditions that the electric potential of every part of the structure to be protected should be less than some critical value. The solution was obtained by using the conjugate gradient method in which the protecting conditions were taken into account by the penalty function method.
Several techniques were proposed to apply the above method to a real complicate structure. In order to cope with the long cpu time for three dimensional problem, an effective method was proposed for obtaining the derivatives o … More f potential, which were needed in the optimizing procedures. For structures in which the electrodes must be located directly on the walls of the structures, the boundary integral equation was modified in such a way that the design variables become independent of the boundary element mesh in order to avoid the remeshing which was necessary in each iteration in the usual optimization procedures.
An effective three dimensional boundary element method was developed for predicting electro-galvanic field response of a structure which consists of slender parts. Another effective method was developed to analyze the galvanic corrosion problems of a heat exchanger which had thousands of stainless pipes connected to the brass plate. The inverse problem where the density of the current across the metal surface was estimated from the potential values measured at some points far from the metal surface was solved by using the fuzzy set and boundary element method. The identification of coating defect in corrosion problems were also treated by usung the boundary element method. Less

  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] 天谷 賢治: "カソード防食システムにおける電極位置の最適化" 日本機械学会論文集(A編). 57. 1431-1435 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 青木 繁: "カソード防食の最適化(電極の最適壁面配置)" 日本機械学会論文集(A編). 57. 1465-1469 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 天谷 賢治: "カソード防食最適化問題への3次元境界要素法の適用" 材料. 40. 1390-1395 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 青木 繁: "クラスタリングによるガルバニック腐食逆問題解析" 材料. 40. 619-624 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宮坂 松甫: "流速差に起因する通気差腐食の考察(境界要素法による解析)" 材料と環境. 40. 401-406 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shigeru AOKI: "Prediction of Galvanic corrosion rates by the Boundary Elemet Method" Mathl Comput.Modelling. 15. 11-22 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shigeru AOKI: "Application of BEM to Galvanic Corrosion and Cathodic Protection" Topics in Boundary Element Research. 7. 65-86 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 天谷 賢治: "細長い部材のガルバニック腐食解析のための効率的境界要素法の開発" 日本機械学会論文集(A編). 58. 1234-1238 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 天谷 賢治: "腐食ペイントの欠陥同定" 日本機械学会論文集(A編). 58. 1508-1512 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kenji AMAYA: "Optimum Location of Electrode in Cathodic Protection System for Boundary Element Methods" Proc.Symposium of the Int.Assoc.11-13 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shigeru AOKI: "Optimization of Cathodic Protection System(Optimum Location of Electrode on Wall),Theory and Applications of Boundary Element Methods" Proc.4th China-Japan Symposium on BEM. 391-398 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shigeru AOKI: "Coating Defect Inspection in Corrosion Probrems" Proceedings of the VII International Congress on Experimental Mechanics. II. 1617-1621 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kenji AMAYA: "Optimum Design of Cathodic Protection System by 3-D BEM" Proceedings of the 7th Conference on Boundary Element Technology BETECH/92. 375-388 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 青木 繁: "境界要素法を用いた熱交換器のガルバニック腐食解析" 日本機械学会材料力学部門講演会講演論文集. 920-72. 73-74 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 青木 繁: "先験情報を利用したガルバニック腐食問題の逆解析" 日本機械学会材料力学部門講演会講演論文集. 920-72. 75-76 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K. AMAYA, S.: "AOKI and K. KISHIMOTO: OPTIMUM Location of Electrode in Cathodic Protection System" Trans. Japan Soc. Mech. Eng. (A). 57-538. 1431-1435 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. AOKI and K. AMAYA: "Optimization of Cathodic Protection System (Optimum Location of Electrode on Wall) (in Japanese)" Trans. Japan Soc. Mech. Eng.(A). 57-539. 1465-1469 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. AMAYA and S. AOKI: "Application of 3-D BEM to Optimization of Cathodic protection System (in Japanese)" J. Soc. of Material. 40-457. 1390-1395 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. AOKI and Y. URAI: "Inverse Analysis of Galvanic Corrosion Problems Using Clustering Techniques (in Japanese)" J. Soc. of Material. 40-452. 619-624 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.MIYASAKA, K.KISHIMOTO and S. AOKI: "Study on Differential Aeration Cell Corrosion owing to Differential Flow Rate (Analysis of Boundary Element Method)(in Japanese)" Zairyo-to-Kankyo. 40-6. 401-406 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. AOKI and K. KISHIMOTO: "Prediction of Galvanic corrosion rates by the Boundary Element Method" Mathl Comput. Modelling. 15-3. 11-22 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.AOKI and K.KISHIMOTO: "Application of BEM to Galvanic Corrosion and Cathodic Protection" Topics in Boundary Element Research. 7. 65-86 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. AMAYA and S. AOKI: "Development of Effective BEM for Galvanic Corrosion Analysis of a Slender Structure" Trans. Japan Soc. Mech. Eng. (A). 58-551. 1234-1238 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. AMAYA and S. AOKI: "Identification of Coating Defect in Corrosion Problems (in Japanese)" Trans. Japan Soc. Mech. Eng. (A). 58-552. 1508-1512 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. AMAYA, S AOKI and K. KISHIMOTO: "Optimum Location of Electrode in Cathodic protection System" Proc. Symp. Int. Assoc. for BEM. 11-13 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. AOKI and K. AMAYA: "Optimigation of Cathodic Protection System (Optimum Location of Electrode on Wall)" Proc. 4th China -Japan Symp. BEM. 391-398 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. AOKI and K. AMAYA: "Coating Defect Inspection in Corrosion Probrems" Proc. VII Int. Cong. on Exp. Mechanics. II. 1617-1621 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. AMAYA:"Optimum Design of Cathodic Protection System by 3-D BEM" Proc. 7th Conf. B. E. Tech.BETECH/92. 375-388 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. AOKI: "Galvanic Corrosion Analysis on Heat Exchanger by Boundary Element Method (in Japanese)" Proc. 1992 Annal Meeting JSME/ MMD. No. 920-72. 73-74 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. AOKI: "Inverse Analysis of Galvanic Corrosion Problems using Apriori Information (in Japanese)" Proc. 1992 Annal Meeting JSME/MMD. No. 920-72. 75-76 (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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