Nonlinear Modelling and Parametric Study of a Sealed Tuned Liquid Column Damper for Vibration Mitigation 2019-01-5045
The main intention of the present study is to reduce unwanted vibrations of mechanical systems through a sealed tuned liquid column damper (STLCD). A nonlinear mathematical model including nonlinear hydrodynamic damping and air stiffness of the STLCD is considered to study the dynamic behaviour of a structure-STLCD system. A parametric study to investigate the effect of the main parameters of the STLCD such as length ratio and mass ratio on the dynamic behaviour of the main system is presented. The air volume at rest is considered as an additional design parameter. The results obtained showed that the efficiency and the range of application of the STLCD to control the system’s resonance vibration are more than that of the traditional one. In addition, it can be noticed that the gain in vibration mitigation from the STLCD with increase in mass ratio and length ratio higher than 7% and 0.8, respectively, is generally modest. These results enhance the actual implementation of the STLCD for small horizontal space applications. Equations for the optimum value of the initial air height ratio and its corresponding performance index as a function of both mass ratio and relative length were proposed.