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1990 Fiscal Year Final Research Report Summary

Suppression Method of Flexible Structure Aerodynamic Vibration by Active Control of Accelerating Fluid in Separating Shear Flow.

Research Project

Project/Area Number 01460171
Research Category

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

Allocation TypeSingle-year Grants
Research Field 土木構造
Research InstitutionKyushu Institute of Technology

Principal Investigator

KUBO Yoshinobu  Kyushu Institute of Technology, Civil Engineering, Associate Professor., 工学部, 助教授 (70093961)

Co-Investigator(Kenkyū-buntansha) KATO Kusuo  KYUSHU INSTITUTE OF TECHNOLOGY, CIVIL ENGINEERING, RESEARCH ASSISTANT., 工学部, 助手 (60039138)
Project Period (FY) 1989 – 1990
Keywordsboundary layer control / aerodynamic response / suppression of aerodynamic vibration / surface pressure distribution / vortex-excited oscillation / galloping / flow visualization / super-long suspension bridge
Research Abstract

The present research has been conducted to find the method how to apply the boundary layer control method on the suppression of aerodynamic responses of bluff bodies. The useful informations for suppression of aerodynamic responses of bluff body were obtained from the fundamental experiments of measuring surface pressure and aerodynamic responses of square prism with two rotating cylinders set on upstream corners.
(1) The mean and fluctuating pressures can be controlled by controlling the rotary surface velocity of the rotating cylinder.
(2) The higher rotary surface velocity leads the bluff body to be a more stream-lined body. In other words, the bluff body can be improved to the elongated body by accelerating the boundary layer by the rotating cylinder.
(3) The most effective combination of rotary surface velocities of two rotating cylinders in the present research is the case that one is at rest and another is rotating with the velocity higher than 1.4 times of approaching flow velocity.
(4) The case that the both rotating cylinders have the same rotary surface velocity has the tendency that the higher rotary surface velocity leads the aerodynamic responses to the higher on-set wind velocity of the galloping responses of the square cylinder.
(5) The aerodynamic responses can be completely suppressed by the one rotary cylinder owing to disappearance of alternative surface pressure fluctuations between upper and lower side surface pressure.
The extensive research will be conducted how to apply this method to the practical structures of super-long suspension bridges and super-high buildings which are proposed by Japanese government and some Japanese companies.

  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] 久保 喜延、安田 英明、加藤 九州男: "境界層加速による正方形角柱の耐風制振法" 構造工学論文集. Vol.37A. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshinobu KUBO,HideAki YASUDA,: "Surface Pressure Characteristics of a Square Prism under Aerodynamic response Control by Boundary Acceleration" Proceedings of Fifth International Conference on Flousーinduced Uibration. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshinobu KUBO,Hideak:YASUDA,Kusuo KATO: "Basic Study for Suppression of Aerodynamic Vibration by the Boundary Layer Acceleration." Proceedings of Eigth In ternational Conference on Wind Eugineering. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. KUBO, H. YASUDA, K. KATO: "Suppression of Aerodynamic Vibration of Square Section by Acceleration of Boundary Layer ( in Japanese )" Journal of Structural Engineering. Vol. 37A. 989-994 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. KUBO, H. YASUDA: "Surface Pressure Characteristics of a Square Prism under Aerodynamic Response Control by Boundary Layer Acceleration" Proceedings of Fifth International Conference on Flow-induced Vibration, London, U. K.(1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. KUBO, H. YASUDA, K. KATO: "Basic Study for Suppression of Aerodynamic Vibration by the Boundary Layer Acceleration" Proceedings of Eigth International Conference on Wind Engineering, London, Canada. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. KUBO, H. YASUDA, A. Okii: "Aerodynamic Suppression Method of Square Prism by Rotating Cylinders ( in Japanese )" Proceedings of Annual Conference of Seibu Branch of Japan Society of Civil Engineers. (1991)

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

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Published: 1993-08-12  

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