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Offshore projects planning and execution
Dynamic Analysis of Fixed Bottom Offshore Wind Turbines
Throumoulopoulosv, Amfilochios G. (Department of Civil Engineering, Aristotle University of Thessaloniki (AUTh)) | Loukogeorgakiv, Eva (Department of Civil Engineering, Aristotle University of Thessaloniki (AUTh)) | Dimitriou, Aristarchos C. (Department of Civil Engineering, Aristotle University of Thessaloniki (AUTh)) | Angelides, Demos C. (Department of Civil Engineering, Aristotle University of Thessaloniki (AUTh))
ABSTRACT In this paper, a numerical tool (MicroSAS-OWT) for the integrated analysis of Offshore Wind Turbines (OWTs) with fixed-bottom support structure of arbitrary shape is presented. MicroSAS-OWT is developed through the coupling of FAST with MicroSAS. FAST is used for modeling the rotor nacelle assembly, while the tower and the support structure are modeled in MicroSAS. The interface of the two codes is ensured at the tower top. The tool is applied for the case of the NREL 5MW OWT that consists of a monopile support structure with rigid foundation, and is preliminary assessed through comparison of results with the corresponding ones obtained using FAST. Stress analysis of the tower and the support structure is also performed. INTRODUCTION Offshore wind energy represents a very promising kind of renewable energy source. Offshore Wind Turbines (OWTs) are considered nowadays as an attractive alternative solution to the onshore ones offering multiple benefits and addressing effectively the well-known obstacles and problems associated with the latter ones (Henderson et al., 2003; Breton and Moe, 2009; Esteban et al., 2011). The efficient exploitation of offshore wind energy necessitates the successful handling of several challenges related to developmental, economical and technological issues (Musial et al., 2006). Among these challenges, one of the most crucial is the development, investigation, assessment and adoption of new design concepts, especially for the support structure. These new design concepts will allow the placement of OWTs in deeper water and therefore, the operation of larger capacity OWTs. Considering the high complexity characterizing any OWT system, resulting from its inherent characteristics (e.g. variability and intense interaction of components) and from its operation in a complex environment, where different loading sources exist, the development/application of suitable numerical tools is critical for addressing efficiently the previously mentioned challenge.
- North America > United States (1.00)
- Europe (1.00)
- Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems > Platform design (1.00)
- Facilities Design, Construction and Operation > Facilities and Construction Project Management > Offshore projects planning and execution (0.92)
A Numerical Tool For the Integrated Analysis of Fixed-Bottom Offshore Wind Turbines
Loukogeorgaki, Eva (Department of Civil Engineering, Aristotle University of Thessaloniki (AUTh)) | Angelides, Demos C. (Department of Civil Engineering, Aristotle University of Thessaloniki (AUTh)) | Llorente, Carlos (McDermott Inc.)
ABSTRACT In this paper, a numerical tool (MicroSAS-OWT) for the integrated analysis of Offshore Wind Turbines (OWTs) with fixed-bottom support structure of arbitrary shape is presented. MicroSAS-OWT is developed through the coupling of FAST with MicroSAS. FAST is used for modeling the rotor nacelle assembly, while the tower and the support structure are modeled in MicroSAS. The interface of the two codes is ensured at the tower top. The tool is applied for the case of the NREL 5MW OWT that consists of a monopile support structure with rigid foundation, and is preliminary assessed through comparison of results with the corresponding ones obtained using FAST. Stress analysis of the tower and the support structure is also performed. INTRODUCTION Offshore wind energy represents a very promising kind of renewable energy source. Offshore Wind Turbines (OWTs) are considered nowadays as an attractive alternative solution to the onshore ones offering multiple benefits and addressing effectively the well-known obstacles and problems associated with the latter ones (Henderson et al., 2003; Breton and Moe, 2009; Esteban et al., 2011). The efficient exploitation of offshore wind energy necessitates the successful handling of several challenges related to developmental, economical and technological issues (Musial et al., 2006). Among these challenges, one of the most crucial is the development, investigation, assessment and adoption of new design concepts, especially for the support structure. These new design concepts will allow the placement of OWTs in deeper water and therefore, the operation of larger capacity OWTs. Considering the high complexity characterizing any OWT system, resulting from its inherent characteristics (e.g. variability and intense interaction of components) and from its operation in a complex environment, where different loading sources exist, the development/application of suitable numerical tools is critical for addressing efficiently the previously mentioned challenge.
- North America > United States (1.00)
- Europe (1.00)
- Reservoir Description and Dynamics > Reservoir Simulation (1.00)
- Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems > Platform design (1.00)
- Facilities Design, Construction and Operation > Facilities and Construction Project Management > Offshore projects planning and execution (0.91)
Fatigue Analysis of a Tripod Supporting Structure of an Offshore Wind Turbine
Zacharioudaki-Apelidou, Fotini (Department of Civil Engineering, Aristotle University of Thessaloniki) | Dedonakis, Fotios (Department of Civil Engineering, Aristotle University of Thessaloniki) | Angelides, Demos C. (Department of Civil Engineering, Aristotle University of Thessaloniki)
ABSTRACT Offshore Wind Turbines (OWT) are exposed to loads varying both in time and in amplitude, designating fatigue damage as a main concern. In this paper, an analysis is presented for assessing the total fatigue damage of an OWT tripod supporting structure. The combined effect of wind and wave loading is computed and different loading scenarios are examined to determine the dominating load on the final result. Further investigation is done to assess the influence of different welding profiles of the tubular joints of the structure on the final fatigue resistance. Results are presented and conclusions are drawn, indicating the importance of the combined analysis. INTRODUCTION The geography of Greece consists of numerous inhabited smaller and bigger islands, with energy needs varying throughout the year. This decentralized demand for energy can be addressed by providing the islands with an autonomous source of energy production. Offshore Wind Turbines (OWT) are an appealing alternative to satisfy this need. A solution like this would allow the islands to use their own resources and produce their own energy in an environmentally friendly way. The realization of OWT is a complicated task and an engineering challenge. Several design scenarios have to be taken into account, including extreme load and fatigue load cases. OWT are exposed to critical environmental loads, which designate this kind of analysis essential. Contrary to common offshore structures- such as oil and gas platforms, OWT are not only exposed to dynamic wave loads but also to dynamic loads from the turning rotor of the Wind Turbine. These loads make OWT susceptible to fatigue damage. Loads varying in amplitude, direction and time act on the structure throughout its lifetime, progressively reducing the fatigue resistance. Deeper water depths for installation and turbines of larger size used nowadays, lead to increased loadings upon the supporting structure.
- Europe (1.00)
- North America > United States (0.69)
- Facilities Design, Construction and Operation > Offshore Facilities and Subsea Systems > Platform design (0.92)
- Facilities Design, Construction and Operation > Facilities and Construction Project Management > Offshore projects planning and execution (0.82)
- Health, Safety, Environment & Sustainability > Environment (0.67)