Experimental Investigations of Vortex Induced Vibration of A Flat Plate in Pitch Oscillation
Abstract
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.
Subject
Experimental InvestigationVortex-induced Vibration
"Lock-in"
Pitch Oscillation
Vibration Frequency
Shedding Frequency
Citation
Yang, Yi (2010). Experimental Investigations of Vortex Induced Vibration of A Flat Plate in Pitch Oscillation. Master's thesis, Texas A&M University. Available electronically from https : / /hdl .handle .net /1969 .1 /ETD -TAMU -2010 -12 -8984.