Abstract
A model for Quick Load Analysis, QuLA, of an offshore wind turbine substructure is presented. The aerodynamic rotor loads and damping are precomputed for a load-based configuration. The dynamic structural response is represented by the first global fore-aft mode only and is computed in the frequency domain using the equation of motion. The model is compared against the state of the art aeroelastic code, Flex5, and both life time fatigue and extreme loads are considered in the comparison. In general there is good similarity between the two models. Some derivation for the sectional forces are explained in terms of the model simplifications. The difference in the sectional moments are found to be within 14% for the fatigue load case and 10% for the extreme load condition.
Highlights
In order to ensure cost-efficient offshore wind farms, it is necessary to optimize the design
This paper investigates how well QuLA performs by comparing the model against the aeroelastic code Flex5, [4]
The sectional inline force and overturning moment in different sections in the Mono Bucket and tower are considered for two load cases and both life time fatigue and extreme loads are analysed
Summary
In order to ensure cost-efficient offshore wind farms, it is necessary to optimize the design. In the preliminary design phase, the integrated simulation and optimization can be accelerated further with a simplified description of the loading from wind and waves and a simple but fast dynamic model. In the present paper a model for Quick Load Analysis, QuLA, is presented This is a fast model for calculation of dynamic loads of an offshore wind turbine tower and foundation. The sectional inline force and overturning moment in different sections in the Mono Bucket and tower are considered for two load cases and both life time fatigue and extreme loads are analysed. In QuLA, only the Mono Bucket foundation and wind turbine tower are considered and described as a simple Euler beam. The external and internal forces which contribute to sectional force, F , and moment, M
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