Communication Dans Un Congrès Année : 2022

Impact of piezoelectric shunts on vortex induced vibrations of marine lifting surfaces

Résumé

Hydrofoils or propeller blades may sustain high amplitude flow induced vibrations resulting in structural fatigue and acoustic radiated noise. A drastic increase of the vibration amplitude occurs when a vortex shedding frequency synchronizes with a natural frequency of the structure inducing the lock-in phenomenon. A passive vibration reduction system consisting of a resonant piezoelectric shunt was designed to reduce the vibrations of a truncated NACA 66-306 hydrofoil immersed in an uniform flow at zero degrees of incidence in the hydrodynamic water tunnel of the IRENav. The free stream velocity of the flow was varied in order to study several chord based Reynolds numbers ranging from 2.55x10^5 to 4.68x10^5. The shunt system consists of a MFC piezoelectric patch embedded on the hydrofoil surface and connected to a ferrite-core inductor that has been specially designed for the electrical resonance frequency to match with the foil structural resonance frequency of the twisting mode in water. A finite element model has been employed to predict the natural frequencies of the foil and the piezoelectric coupling coefficients in still water. The structural response of the foil to hydrodynamic excitation as well as its wake flow dynamics were investigated experimentally by laser vibrometry and time resolved particle image velocimetry (TR-PIV), respectively. Analysis of the measured data was achieved by using post treatment methods consisting in modal analysis of the structural vibrations and proper orthogonal decomposition (POD) of the velocity field in the wake. The lock-in with the twisting mode is achieved for a reduced velocity of 2.6. A vibration reduction of nearly 60% is observed when the piezoelectric shunt is activated at the lock-in, inducing an alteration of the temporal coherence of the two first POD modes. The shunt system also provides a high vibration reduction level over a broad range of reduced velocities ranging in [2.1-3] corresponding to the resonance and lock-in regimes. Vibration reduction by passive resonant shunt will pave the way to various industrial applications requiring a low vibration level or acoustic discretion.
Fichier non déposé

Dates et versions

hal-04853870 , version 1 (22-12-2024)

Identifiants

  • HAL Id : hal-04853870 , version 1

Citer

Yann Watine, Céline Gabillet, Boris Lossouarn, Jean-François Deü, Jacques Andre Astolfi. Impact of piezoelectric shunts on vortex induced vibrations of marine lifting surfaces. 25ème Congrès Français de Mécanique, CFM 2022, Aug 2022, Nantes, France. ⟨hal-04853870⟩
32 Consultations
0 Téléchargements

Partager

More