SUPERVISORY SWITCHED CONTROL OF MARINE RISERS

For a riser array in deep waters interference between individual risers exposed to strong ocean current and/or large TLP motions is of concern. The lateral deflections are likely to be large, and the risers may experience collision with fatigue or surface damage as a consequence. In this paper a supervisory switched controller for marine risers using a riser tensioner system is proposed. A case study shows how the controller structure and parameters change according to the environmental conditions and the riser behavior.