Advanced Reliability Assessment of Offshore Wind Turbine Monopiles by Combining Reliability Analysis Method and SHM/CM Technology
- Athanasios Kolios (Cranfield University) | Lin Wang (Cranfield University)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- stochastic finite element analysis, Offshore wind turbine, condition monitoring, reliability assessment, structural health monitoring, monopiles
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- 29 since 2007
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In this work, advanced reliability assessment of OWT (offshore wind turbine) monopiles is proposed by combining reliability analysis method and SHM (structural health monitoring) / CM (condition monitoring) technology. A 3D (three-dimensional) parametric FEA (finite element analysis) model of OWT monopiles is developed, considering soil-structure interactions. A number of stochastic FEA simulations of OWT monopiles are performed, taking account of stochastic variables, such as wind loads, wave loads and soil properties. Multivariate regression is then used to post-process the FEA results, obtaining the performance functions expressed in terms of stochastic variables. After that, FORM (first order reliability method) is used to calculate the reliability index, evaluating the reliability of the OWT monopiles. In the presence of SHM/CM data, the reliability of monopile structures is reassessed and updated. The updated reliability index provides valuable information for decision making for inspection and maintenance of OWT monopiles. The application of the proposed advance reliability assessment method to a 45m-length OWT monopile is presented, showing great potential to reduce the OPEX (operating expenditure) of OWT monopiles by using the proposed method.
Wind power is capable of providing a competitive solution to battle the energy crisis and global climate change, making it the most promising renewable energy resource. Currently, the vast majority of wind power are generated from onshore wind farms. However, the growth of onshore wind farms is limited to some extent by the visual pollution caused by large wind turbines and the limited available space to deploy onshore wind turbines. Compared to the land, there is more available space to deploy wind turbines at sea and the wind is stronger and steadier in offshore locations, driving wind industry move to offshore. According to European Wind Energy Association (EWEA, 2015), offshore wind in Europe is expected to reach 64.8 GW, supplying around 8.4% of total electricity demand in Europe in 2030.
Representing around 80.1% of overall EU's installation in 2015 (Wilkes et al., 2016), Monopiles are currently the most widely used foundation for OWTs (offshore wind turbines), due to their ease of both manufacturing and installation. They are well suitable for water depths shallower than 30m (Maciel, 2010).
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