Wind and Structures

  • 제16권4호
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  • Pages.341-354
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  • 2013
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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Maximum Vortex-Induced Vibrations of a square prism

  • Barrero-Gil, A. (Aerospace Thermal and Fluids Mechanics Department, School of Aeronautics, Universidad Politecnica de Madrid) ;
  • Fernandez-Arroyo, P. (Aerospace Thermal and Fluids Mechanics Department, School of Aeronautics, Universidad Politecnica de Madrid)
  • 투고 : 2011.06.02
  • 심사 : 2012.05.17
  • 발행 : 2013.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

This paper presents an experimental investigation concerning the peak amplitudes of oscillation of a square prism due to Vortex-Induced-Vibrations (VIV) as a function of the mass damping parameter $m^*{\zeta}$ (the so called Griffin--plot); $m^*$ and ${\zeta}$ being, respectively, the non-dimensional mass and the mechanical (structural) damping ratio. With this purpose in mind, an electromagnetic actuator has been employed to provide controlled damping. During the experiments the mass--damping parameter was in the range 0.15 < $m^*{\zeta}$ < 2.4. Experiments show that there is a value of $m^*{\zeta}$ below which VIV appears combined with galloping and the prism oscillation increases monotonically with the incoming flow velocity. For $m^*{\zeta}$ >0.3 the present experiments show a well-defined VIV phenomenon and, consequently, a Griffin-plot can be defined.

키워드

참고문헌

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