Hydrofoil flow induced vibration mitigation
by passive resonant piezoelectric shunt
Au LMSSC, Paris, le 7 décembre 2021 à 13h30
Doctorant, École navale, Brest - LMSSC, Cnam, Paris
Marine immersed lifting surfaces such as hydrofoils or propeller blades sustain high amplitude flow induced vibrations resulting in structural fatigue and acoustic noise. As the vortex shedding frequency in the wake of the structure tunes with a natural frequency of the structure, resonance may occur and generate a drastic increase of the vibration amplitude.
The present analysis aims to introduce a passive vibration mitigation system based on a resonant piezoelectric shunt used to reduce the vibrations. The studied geometry consists of a NACA 66-306 truncated hydrofoil of chord length 80 mm immersed at zero degrees of incidence in the hydrodynamic tunnel of the French Naval Academy Research Institute.
Main flow velocities ranging from 3.0 to 5.5 m.s-1 were investigated to evaluate the vibration mitigation provided by the shunt system by using Particle Image Velocimetry (PIV) and vibrometry measurement methods.