Yang, Yi (2010-12). Experimental Investigations of Vortex Induced Vibration of A Flat Plate in Pitch Oscillation. Master's Thesis. Thesis uri icon


  • A bluff structure placed in a flowing fluid, may be subjected to vortex-induced vibrations
    (VIV). For a flat plate with only rotational degree of freedom, the VIV is
    rotational oscillation. Based on the experimental investigation, vortex-induced oscillation
    of the plate is studied. The Strouhal number is measured from the stationary
    plate in a low speed steady wind tunnel. A set of vibration tests are conducted
    to investigate the relationships between shedding frequency and vibration frequency.
    "lock-in" phenomena is observed with and without large amplitude. An empiricalanalytical
    model via introducing a nonlinear van der Pol oscillator is developed.
    This thesis investigates the "lock-in" phenomena of a flat plate in pitch oscillation.
    Results from wind tunnel experiments on a flat plate indicate the "lock-in" is
    frequency "lock-in", resonance which appears large response amplitude occurs in the
    "lock-in" regime and may be influenced by "lock-in" phenomena.

publication date

  • December 2010
  • December 2010