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      Simplified rotor load models and fatigue damage estimates for offshore wind turbines.

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          Abstract

          The aim of rotor load models is to characterize and generate the thrust loads acting on an offshore wind turbine. Ideally, the rotor simulation can be replaced by time series from a model with a few parameters and state variables only. Such models are used extensively in control system design and, as a potentially new application area, structural optimization of support structures. Different rotor load models are here evaluated for a jacket support structure in terms of fatigue lifetimes of relevant structural variables. All models were found to be lacking in accuracy, with differences of more than 20% in fatigue load estimates. The most accurate models were the use of an effective thrust coefficient determined from a regression analysis of dynamic thrust loads, and a novel stochastic model in state-space form. The stochastic model explicitly models the quasi-periodic components obtained from rotational sampling of turbulent fluctuations. Its state variables follow a mean-reverting Ornstein-Uhlenbeck process. Although promising, more work is needed on how to determine the parameters of the stochastic model and before accurate lifetime predictions can be obtained without comprehensive rotor simulations.

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          Author and article information

          Affiliations
          [1 ] Department of Civil and Transport Engineering, Norwegian University of Science and Technology, Høgskoleringen 7A, 7491 Trondheim, Norway michael.muskulus@ntnu.no.
          Journal
          Philos Trans A Math Phys Eng Sci
          Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
          The Royal Society
          1471-2962
          1364-503X
          Feb 28 2015
          : 373
          : 2035
          25583872 rsta.2014.0347 10.1098/rsta.2014.0347

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