ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-472-4
ISBN Online: 978-1-56700-471-7
3rd Thermal and Fluids Engineering Conference (TFEC)
EXPERIMENTAL PARAMETERS IDENTIFICATION OF A FLEXIBLE CYLINDER UNDERGOING VORTEX-INDUCED VIBRATIONS
Аннотация
Despite several investigations on vortex-induced vibrations (VIV), fundamental questions related to parameters
used in the cylinder dynamics equation model, still exist. In this work, a method to identify the mass,
spring and damper coefficients (so-called equivalent parameters) is proposed. An experimental apparatus
was built to study free oscillations of a flexible circular cylinder in steady current along the entire lock-in
region (Re from 97 to 320). Experimental results suggest that equivalent parameters can explain in a better
way the behavior of the cylinder. Frequency of the cylinder is in agreement with the value of the added
mass. Maximum amplitude and hydrodynamic response are related with the total and the vortex phase angle,
respectively. Discrepancies were found comparing actual and literature results.
Ключевые слова:
vortex-induced vibrations, VIV, lock-in, added mass, phase angle, equivalent parameters