Abstract
In this paper, the structural modal frequencies of DTU three-bladed tri-rotor reference wind turbine are analyzed using a high-fidelity linear time-invariant model. In the analysis, the three rotors rotate at equal speed and are aligned in the same plane. The high-fidelity model is established by combining a model of the support structure with three identical time-invariant rotor models. This makes it is possible to use a direct eigenvalue analyze to get the model frequencies as a function of rotor speed. The proposed method is validated by modeling a single-rotor wind turbine and compare modal frequencies with the aeroelastic stability tool HAWCSTAB2. After the validation, the tri-rotor wind turbine is analyzed. The modal frequencies showed that the torsional tower mode is at the same frequency level as the first tower fore-aft and side-side tower mode and that some tower modes change significantly during rotation.
| Original language | English |
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| Title of host publication | Advances in Engineering Materials, Structures and Systems : Innovations, Mechanics and Applications - Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation, 2019 |
| Editors | Alphose Zingoni |
| Number of pages | 6 |
| Place of publication | Leiden |
| Publisher | CRC Press |
| Publication date | 2019 |
| Pages | 681-686 |
| ISBN (Print) | 978-1-138-38696-9 |
| ISBN (Electronic) | 9780429426506 |
| DOIs | |
| Publication status | Published - 2019 |
| Event | 7th International Conference on Structural Engineering, Mechanics and Computation - Cape Town, South Africa Duration: 2 Sept 2019 → 4 Sept 2019 http://www.semc.uct.ac.za/ |
Conference
| Conference | 7th International Conference on Structural Engineering, Mechanics and Computation |
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| Country/Territory | South Africa |
| City | Cape Town |
| Period | 02/09/2019 → 04/09/2019 |
| Internet address |