Passive Suppression of Resonance Vibrations of a Plate and Parallel Plates Assembly, Interacting with a Fluid

Abstract

We present the results of a series of experiments, which study the effect of the fluid layer height, viscosity and free surface waves on the vibration damping of a thin rectangular plates interacting with a fluid. The suppression technique is based on the shunt circuit connected to the piezoelectric elements. The possibility of using the previously proposed mathematical formulation and approach for calculating the optimal values of the parameters of a RL-circuit in systems with hydrodynamic dissipation is estimated. The experimental results presented confirm its reliability. It has been demonstrated that the efficiency of vibration damping of a single plate structure changes insignificantly with increasing height of the fluid layer except for some interval. At a small amount of the liquid, the waves on its free surface disturb the piezoelectric element reducing its efficiency. Using as an example an assembly of two parallel plates damping of “in-phase” and “out-of-phase” modes has been shown using one location of piezoelement.