Wave vibration control of jacket platform by tuned liquid dampers

Abstract

The studies on the applications of tuned mass and liquid column dampers for wave vibration control of offshore structures are notable. Though, the same is not the case for tuned liquid dampers (TLD). However, TLDs are a natural candidate for vibration control of flexible structure by utilizing the sloshing motion of fluid. The present study explores the effectiveness of TLD to mitigate the wave induced vibration effect of offshore jacket platform. In doing so, the jacket platform is modelled considering soil pile interaction effect and the TLD is represented by a spring mass system with due consideration to sloshing energy of water. The performance of TLD to control the wave induced vibration is studied for regular wave load, obtained by Stokes' fifth order theory and also for random wave load, generated by using the Pierson–Moskowitz wave spectrum. The dynamic response analyses are carried out without and with TLD for varying mass ratio, depth ratio and position of placement to study the effect of different parameters on the performance of TLD system. The results of numerical study in general show that TLD is potential for wave vibration mitigation of offshore jacket platform.