The dynamics of monopile-supported Wind Turbines in nonlinear soil

N. A. Alexander, S. Bhattacharya

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

6 Citations (Scopus)

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 languageEnglish
Title of host publicationProceedings of the 8th International Conference on Structural Dynamics, EURODYN 2011
PublisherUniversity of Southampton, Institute of Sound Vibration and Research
Pages3416-3422
Number of pages7
ISBN (Print)9789076019314
Publication statusPublished - 2011
Event8th International Conference on Structural Dynamics, EURODYN 2011 - Leuven, Belgium
Duration: 4 Jul 20116 Jul 2011

Conference

Conference8th International Conference on Structural Dynamics, EURODYN 2011
CountryBelgium
CityLeuven
Period4/07/116/07/11

Keywords

  • Duffing's oscillator
  • Nonlinear dynamics
  • P-y curves
  • Piles
  • Subharmonic resonances

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