Abstract
This paper deals with an experimental study of vortex-induced vibrations of bellows structure subjected to fluid flow. The characteristics of the vortex-induced vibrations, strohal number St and mass damping parameter Sc are examined experimentally with changing the pitch length, the number of flexible convolutions and the convolution shapes. The fluid flow around the vibrating convolutions is visualized and the structure of the vortex street is clarified. As a result, it is found that the lock-in phenomenon occurs to the bellows structure by in-phase and out-of-phase mode due to the coupling between the vibration of the convolutions and vortex streets generated along the convolutions.
