Abstract
AbstractThe design of a medium‐speed drivetrain for the Technical University of Denmark (DTU) 10‐MW reference offshore wind turbine is presented. A four‐point support drivetrain layout that is equipped with a gearbox with two planetary stages and one parallel stage is proposed. Then, the drivetrain components are designed based on design loads and criteria that are recommended in relevant international standards. Finally, an optimized drivetrain model is obtained via an iterative design process that minimizes the weight and volume. A high‐fidelity numerical model is established via the multibody system approach. Then, the developed drivetrain model is compared with the simplified model that was proposed by DTU, and the two models agree well. In addition, a drivetrain resonance evaluation is conducted based on the Campbell diagrams and the modal energy distribution. Detailed parameters for the drivetrain design and dynamic modelling are provided to support the reproduction of the drivetrain model. A decoupled approach, which consists of global aero‐hydro‐servo‐elastic analysis and local drivetrain analysis, is used to determine the drivetrain dynamic response. The 20‐year fatigue damages of gears and bearings are calculated based on the stress or load duration distributions, the Palmgren‐Miner linear accumulative damage hypothesis, and long‐term environmental condition distributions. Then, an inspection priority map is established based on the failure ranking of the drivetrain components, which supports drivetrain inspection and maintenance assessment and further model optimization. The detailed modelling of the baseline drivetrain model provides a basis for benchmark studies and support for future research on multimegawatt offshore wind turbines.
Highlights
In the past decade, the number of offshore wind turbine installations has increased rapidly
As the objective of this study is to provide support for cooperative and comparative studies to facilitate research on the dynamics of 10-MW offshore wind turbines, the conventional three-stage gearbox seems to be more suitable as a baseline model for the present target; this layout is selected to be designed in this study
The vibration modes of the drivetrain multibody system (MBS) model are multidimensional, this study focuses only on torsional vibration in which the resonance of the model is most likely to occur under dynamic excitation
Summary
The number of offshore wind turbine installations has increased rapidly. A concept description of a 10-MW wind turbine was proposed by Technical University of Denmark (DTU) in 2013.1 Since many studies[2,3,4] have been conducted on the design and dynamic analysis of the 10-MW reference wind turbine (RWT). All these studies are focused on the blades and tower; far, no studies have examined the 10-MW wind turbine drivetrain. Dong et al[6] proposed
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