Model Testing of a Passively Controlled 15 MW Floating Wind Tension Leg Platform

This paper discusses the application of a novel passive control technology (Rotating Tension Element Damper, RTED) in attenuating dynamics of a floating wind tension leg platform (TLP) to significantly reduce fatigue and strength loads which ultimately lower the cost of the system. Comprehensive pre-Front End Engineering Design (pre-FEED), including wave basin testing, was carried out to develop the TLP integrated with the RTED. The integrated application of the RTED to a 15 MW floating wind TLP is the first of its kind, and the assessment features model testing performed at 1:60 scale in the wave basin using operational and extreme seas. Results indicate that the RTED attenuates dynamics in all components of the system, over a broad range of frequencies. Findings also reveal complexities which can be associated with dynamic attributes of control system embodiments at sub-scale, thereby providing insights to avoid such effects in full-scale applications.

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