Performance of a Magneto-Rheological Tuned Liquid Column Damper (MR-TLCD) in Mitigating Vibration of an Offshore Structure.

Reducing structural vibrations in offshore marine structures is of great importance due to fatigue-based failures. Employing a damping system within the structure can be defined as the best choice to reduce vibrations. In this paper, the performance of a magneto-rheological tuned liquid column damper (MR-TLCD) system on a three-dimensional fixed offshore structure is studied. The efficiency of the system is investigated considering different wave and earthquake forces in addition to utilizing a traditional tuned liquid column damper (TLCD). Magneto-rheological (MR) fluids yield-stress, which is the most important factor in increment of the damper capability, is studied within different values under wave and earthquake forces. Due to the frequency dependency of liquid column dampers, the damping system results are compared using three mass and frequency ratios. Based on the results, the MR-TLCD system shows great promise in mitigating structural vibrations. The results also indicate the importance of yield stress parameter investigation because of its significant effects on the structural response of the system. [ABSTRACT FROM AUTHOR]