Predicting Loads and Dynamic Responses of An Offshore Jacket Wind Turbine in A Nonlinear Sea
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Loads and Dynamic Responses of An Offshore Jacket Wind Turbine in A Nonlinear Sea WANG Ying-guanga, b, * a State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China b School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240,
China Received December 12, 2019; revised June 18, 2020; accepted July 20, 2020 ©2020 Chinese Ocean Engineering Society and Springer-Verlag GmbH Germany, part of Springer Nature Abstract In order to improve the simulation efficiency, a novel transformed linear Gaussian model has been first proposed in this paper for generating equivalent “nonlinear” irregular waves. It is demonstrated by calculation examples that for obtaining equivalent “nonlinear” waves with the same accuracy, the transformed linear Gaussian model is about 2.7 times faster than the traditional nonlinear simulation method and is about 2.14 times faster than the method proposed by Agarwal and Manuel (2011). The loads and dynamic responses calculation results regarding an offshore jacket wind turbine in this paper demonstrate that nonlinearly simulated irregular waves with bottom effects should be considered in order to design an un-conservative support structure for the offshore wind turbine. Furthermore, by studying the calculation results in this article we have found that the loads and dynamic responses of the offshore wind turbine when inputting transformed linearly simulated waves with bottom effects are almost identical to the corresponding values when inputting nonlinearly simulated waves with bottom effects. All these calculation results clearly demonstrate the superiority and effectiveness of using our novel transformed linear Gaussian model for predicting the wave loads and dynamic responses of an offshore wind turbine operating in a realistic nonlinear sea with bottom effects. Key words: loads, dynamic responses, offshore wind turbine, bottom effects, nonlinear irregular sea Citation: Wang, Y. G., 2020. Predicting loads and dynamic responses of an offshore jacket wind turbine in a nonlinear sea. China Ocean Eng., 34(5): 641–650, doi: https://doi.org/10.1007/s13344-020-0057-x
1 Introduction Renewable energy is being actively pursued in the contemporary world because it is sustainable and does not emit greenhouse gasses that are detrimental to the environment and human health. A classic example of renewable energy is offshore wind energy. An engineering device utilized for exploiting the offshore wind power is called an offshore wind turbine (OWT). In order to successfully design an offshore wind turbine, accurately simulating the irregular ocean waves in the OWT dynamic analysis process is of uttermost importance. However, until very recently, the majority of the people in the worldwide offshore wind energy research community have applied linearly simulated irregular waves in their OWT dynamic simulat
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