Dämpfungsverhalten unterschiedlicher Fluide in einem Flüssigkeitstilgersystem

Damping behavior of different fluids used for a Tuned Liquid Column Damper System

Tuned liquid column dampers (TLCD) represent a good alternative to other commonly used damping systems applied on engineering structures. The use of an additional mass causes a contrary motion in relation to the main oscillating system. This contrary motion enables an efficient way to mitigate unwanted structural vibrations. To obtain high damping efficiencies certain parameters of the TLCD must be optimized and adjusted to the main system. Important parameters would be the mass - m, the eigenfrequency of the damper fT, the stiffness and of course the damping of the system itself. The theoretical and experimental investigations of certain parameters are the aim of this contribution. The main focus was on the damping term of the TLCD. Since it is strongly dependent on the rheological parameters of the fluid, such as viscosity, shear rates, density etc. different fluids were tested and after evaluation compared. To execute these experiments, a test stand has been designed and built. So the main aim of this research work is to theoretically explain fundamental fluid parameters and in a further step to show how a change of these parameters changes the damping behavior of the TLCD.