Wind and Structures

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Role of coupled derivatives on flutter instabilities

  • Matsumoto, Masaru (Department of Global Environment Engineering, Kyoto University) ;
  • Abe, Kazuhiro (Department of Global Environment Engineering, Kyoto University)
  • Published : 1998.06.25
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Abstract

Torsional flutter occurs at 2D rectangular cylinders with side ratios B/D smaller than about 8 or 10. On the other hand, slender cylinders indicate the occurrence of coupled flutter, which means the coupled derivatives of slender cylinders have more significant role for flutter instability than that of bluffer ones. In this paper, based upon so called "Step-by-step analysis", it is clarified the coupled derivatives stabilize torsional flutter instability of bluffer cylinders (e.x. B/D=5), while they destabilize torsional flutter or coupled flutter instabilities of mores slender cylinders. The boundary of them exists between B/D=5 and 8.

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References

  1. Matsumoto, M., Niihara, Y., Kobayashi, Y., (1994), "On mechanism of flutter phenomena for structural sections" , 40A, Journal of Structural Engineering.
  2. Matsumoto, M., Daito, Y., Yoshizumi, F., Ichikawa, Y., (1997), "Torsional flutter of bluff bodies" , Journal of Wind Engineering and Industrial Aerodynamics.
  3. Matsumoto, M. (1995), Aerodynamic damping of prisms" , Proc. lWEF.
  4. Scanlan, R.H. and Tomko, J.J. (1971), "Airfoil and bridge deck flutter derivatives" , J. ASCE EM6.
  5. Von Karman, Th. and Dann, L.G., (1949), "Aerodynamic stability of suspension bridges", F.D. Farquharson(ed.) Bull. of Univ. Washington Eng. Exp. Station, No. 116 Part 3.

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