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Fluttering Behavior of a Flexible Thin Sheet in High Speed Air Flow

Research Project

Project/Area Number 08650225
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionMeisei University

Principal Investigator

YAMAGUCHI Nobuyuki  Meisei University, Faculty of Science and Engineering, Dept.of Mechanical Engineering, Professor, 理工学部, 教授 (60267375)

Co-Investigator(Kenkyū-buntansha) OGATA Masayuki  Meisei University, Faculty of Science and Engineering, Dept.of Mechanical Engine, 理工学部, 助手 (40062327)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,600,000 (Direct Cost: ¥1,600,000)
KeywordsAeroelasticity / Flutter / Flexible Sheet / Fluid-Induced Vibration / Stiffness / Mass Ratio / Progressive Wave / Wind Tunnel Test / 空気力学 / 弾性学 / 空力弾性 / 振動 / 渦
Research Abstract

Process of moving and/or handling in air at high speed a very thin and flexible sheet of such as paper, plastic film, cloth, thin metal plate, etc. are utilized in many fields of industry. Accelerating such processes tends to cause fluttering of the sheet, thus having adverse effects on the product quality and the production efficiency. The phenomena are considered to be of aeroelastic instability (flutter) induced by the interference of the sheet elastic behavior and the aerodynamic excitation. This investigation aimed to establish a method for prediction and elucidation of the phenomena on both theoretical and experimental bases.
Tests were conducted on sheets of papers with the leading edge fixed and the trailing edge freely blown in a small wind tunnel ; experimental data on flutter speeds, frequencies, and modes, etc. were collected for a wide variety of the sheet conditions. The experimental flutter limits were found to form a clear boundary in terms of relative stiffness (stiffness/dynamic pressure) vs.mass ratio, and the vibrational characteristics were summarized in terms of reduced frequency vs.mass ratio..
At the same time, a prediction method of the flutter condition was developed utilizing a distributed vortex method for the fluid dynamics and an elastic beam theory for the sheet dynamics on the assumption of small perturbation. Results predicted by the method gave good agreement with the above experimental data and explained well the characteristics of the phenomena observed.
It is also necessary to know about the effects of external disturbances tending easily to affect very thin sheets. This investigation includes experimentally obtained informations on such concerns.
Thus the investigation, both experimental and theoretical, succeeded in forming a basis and providing a useful means for evaluating and tackling the practical situations.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report

Research Products

(6 results)

All Other

All Publications

  • [Publications] YAMAGUCHI, Nobuyuki: "Prediction of Stability Limits and Fluttering Behavior of a Flexible Thin Sheet in High speed Flow" Internationnal Conf.on Fluid Engnng,JSME Centennial Grand Congress,Jpn Soc.Mech.Eng.ICFE-97-1109,No.97-203,Vol.1. 527-532 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 山口 信行, 他2名: "吹き流しシートのフラッター限界に影響する実験的擾乱要因に関する研究" 日本機械学会75期通常総会講演会講演論文集,流体工学部門,論文No.1547. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] YAMAGUCHI,Nobuyuki: "Prediction of Stability Limits and Fluttering Behavior of a Flexible Thin Sheet in High Speed Flow" International Conference on Fluid Engineering, JSME Centennial Grand Congress, Japan Society of Mechanical Engineers. ICFE-97-1109, No.97-203, Vol.1. 527-532 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] YAMAGUCHI,Nobuyuki, etal.: "Effects of External Disturbances on Flutter Speeds of Flexible Thin Sheets Blown in Air Flow (in Japanese)" Transaction No.1547, Preprint of Japan Society of Mechanical Engineers, March. (to be published). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] YAMAGUCHI, Nobuyuki: "Prediction of Stability Limits and Fluttering Behavior of a Flexible Thin Sheet in High Speed Flow" International Conf.on Fluid Engnng,JSME Centennial Grand Congress,Jpn Soc.Mech.Eng.ICFE-97-1109, No.97-203, Vol.1. 527-532 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 山口信行, 他2名: "吹き流しシートのフラッター限界に影響する実験的擾乱要因に関する研究" 日本機械学会75期通常総会講演会講演論文集,流体工学部門,論文No.1547. (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1996-03-31   Modified: 2016-04-21  

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