Semi-active magneto-rheological damper to reduce the dynamic response of top-tension risers
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The exploration and extraction of offshore hydrocarbon is currently facing stricter requirements in environmental conditions, structural integrity, and dynamic performance. If the structural responses can be monitored and controlled, then smart-platform technology can greatly widen the applicability of current technology toward deeper waters and more severe environmental conditions. This paper is focusing on the robust dynamic simulations and analysis of a top-tension drilling riser in a generic tension leg platform (TLP), incorporated with a fuzzy-logic-controlled magneto-rheological (MR) damper-tensioner system. The innovation is inspired from the successful engineering applications of MR dampers in land-based buildings as isolators against large-amplitude earthquake vibrations. The specific characteristic of MR dampers in alternating the damping forces has great potential to interactively change the structural behaviors corresponding to various external loadings. The main objectives of this paper are (i) to model a MR damper-tensioner that is tailored for use in the drilling riser on the TLP, (ii) to implement the MR damper-tensioner and its control scheme in the TLP global simulation program, (iii) to numerically study the proposed coupled tendon-riser-hull system under an extreme condition to verify its feasibility. This research is expected to provide a reliable and cost-effective solution for greatly expanding the capability of future smart offshore-platform technology. Copyright 2013 by the International Society of Offshore and Polar Engineers (ISOPE).