An analysis method of the vortex-induced vibrations of a tethered sphere
Autor: | Domenica Mirauda, Stefano Malavasi, Marco Negri |
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Rok vydání: | 2020 |
Předmět: |
020209 energy
Trajectory Chaotic Laboratory experiments 02 engineering and technology 01 natural sciences 010305 fluids & plasmas symbols.namesake Normal mode 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Randomness Physics Mechanical Engineering Reynolds number Mechanics Phase average Condensed Matter Physics Vortex-induced vibrations Reduced velocity Tethered sphere Vortex Vibration Flow (mathematics) Mechanics of Materials symbols |
Zdroj: | Meccanica. 55:1949-1974 |
ISSN: | 1572-9648 0025-6455 |
Popis: | Vortex-induced vibrations (VIV) in systems with more than one degree of freedom often present complex synchronization among the motion components, also hidden by the randomness that characterizes the motion itself. A phase average method has been here developed and applied to the displacements of a tethered sphere, at low mass and damping, to analyze its xy trajectories over a wide range of reduced velocities, 5 ≤ U* ≤ 25 (Reynolds numbers, 5.1 × 103 ≤ Re ≤ 2.67 × 104). This method has allowed the identification of both the periodic and chaotic contribution of each motion component, accurately reconstructing the underlying trajectory periodic pattern. The two classical vibration modes, I and II, have been also observed. The method developed here was able to better rebuild the experimental data compared to other methods found in the relevant literature, providing useful insights into the study of the dynamic response of a freely-oscillating tethered sphere immersed in a steady flow. |
Databáze: | OpenAIRE |
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