Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
VORTEX INDUCED VIBRATION IN A SINGLE DEGREE OF FREEDOM CYLINDER WITH STRUCTURAL NONLINEARITIES
Submission Author:
Sérvio Túlio Suenai Haramura Bastos , SP
Co-Authors:
Sérvio Túlio Suenai Haramura Bastos, Rui Marcos Grombone de Vasconcellos, Flavio D. Marques
Presenter: Sérvio Túlio Suenai Haramura Bastos
doi://10.26678/ABCM.COBEM2019.COB2019-0769
Abstract
In this research project, it is proposed the investigation of the effects of hardening structural nonlinearity in a single degree of freedom cylinder exposed to a transverse flow, presenting the vortex induced vibration effect. To check the validity of the implemented phenomenological model, numerical simulations have been performed and the results have been compared with experiments. Simulations showed that the presence of this type of nonlinearity extends the lock-in region by changing the structural natural frequency as the amplitude of oscillations increases with the freestream speed and the vortex shedding frequency. Besides, other parameters, such as the mass and the diameter of the cylinder, affect the synchronization region. A wind tunnel test validated of the obtained simulated results. The contributions of this research can be helpful in order to prevent vortex induced vibrations in realistic nonlinear structures.
Keywords
Vortex-Induced Vibration, nonlinear structures, hardening structural nonlinearity
