This paper explores geometry optimization of an offshore wind turbine’s mooring system considering the minimization of the material cost and the cumulative fatigue damage. A comparison of time domain simulations against frequency domain simulations is made to explore the suitability of these methods to the design process. The efficient design options, the Pareto front, from the frequency domain study are also re-evaluated using time domain simulations and compared against the time domain Pareto front. Both the time and frequency domain results show optimal results utilizing similar design philosophies, however, the frequency domain methods severely under predict the fatigue loads in the mooring system and incorrectly class infeasible solutions as feasible. The frequency domain is therefore not suitable for optimization use without some external means of applying engineering constraints. Furthermore, re-evaluation of the frequency domain solutions provides guidance to the uncertainty and the necessary design fatigue factors required if implementing frequency domain methods in design.
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ASME 2018 1st International Offshore Wind Technical Conference
November 4–7, 2018
San Francisco, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5197-5
PROCEEDINGS PAPER
Comparing Frequency and Time Domain Simulations for Geometry Optimization of a Floating Offshore Wind Turbine Mooring System Available to Purchase
Ajit C. Pillai,
Ajit C. Pillai
University of Exeter, Penryn, UK
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Philipp R. Thies,
Philipp R. Thies
University of Exeter, Penryn, UK
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Lars Johanning
Lars Johanning
University of Exeter, Penryn, UK
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Ajit C. Pillai
University of Exeter, Penryn, UK
Philipp R. Thies
University of Exeter, Penryn, UK
Lars Johanning
University of Exeter, Penryn, UK
Paper No:
IOWTC2018-1006, V001T01A016; 11 pages
Published Online:
December 13, 2018
Citation
Pillai, AC, Thies, PR, & Johanning, L. "Comparing Frequency and Time Domain Simulations for Geometry Optimization of a Floating Offshore Wind Turbine Mooring System." Proceedings of the ASME 2018 1st International Offshore Wind Technical Conference. ASME 2018 1st International Offshore Wind Technical Conference. San Francisco, California, USA. November 4–7, 2018. V001T01A016. ASME. https://doi.org/10.1115/IOWTC2018-1006
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