Abstract
Offshore wind turbines are considered as a reliable source of renewable energy in the UK but there are no long term observations of the performance of these relatively novel structures. The structures are dynamically sensitive due to the very nature of the shape and mass distribution (slender and top heavy). Monitoring of a limited number of offshore wind turbines has indicated a gradual departure of the overall system dynamics from the design requirements. The aim of this paper is to carry out rigorous analytical studies to establish the natural (linear) frequencies and resonant (nonlinear) frequencies of a pile-soil system. Numerical continuation is used to identify nonlinear frequency response functions of the resulting Duffing's like nonlinear oscillator. The back bone curves of these plots enable an empirical formulae for the resonant system frequency with input amplitude. The presence of subharmonic resonances is explored.
| Original language | English |
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| Title of host publication | Proceedings of the 8th International Conference on Structural Dynamics, EURODYN 2011 |
| Publisher | University of Southampton, Institute of Sound Vibration and Research |
| Pages | 3416-3422 |
| Number of pages | 7 |
| ISBN (Print) | 9789076019314 |
| Publication status | Published - 2011 |
| Event | 8th International Conference on Structural Dynamics, EURODYN 2011 - Leuven, Belgium Duration: 4 Jul 2011 → 6 Jul 2011 |
Conference
| Conference | 8th International Conference on Structural Dynamics, EURODYN 2011 |
|---|---|
| Country/Territory | Belgium |
| City | Leuven |
| Period | 4/07/11 → 6/07/11 |
Keywords
- Duffing's oscillator
- Nonlinear dynamics
- P-y curves
- Piles
- Subharmonic resonances
