TY - JOUR
T1 - Probabilistic analysis of offshore wind turbines under extreme resonant response
T2 - Application of environmental contour method
AU - Velarde, Joey
AU - Vanem, Erik
AU - Kramhøft, Claus
AU - Sørensen, John Dalsgaard
PY - 2019/12
Y1 - 2019/12
N2 - Offshore wind turbines can exhibit dynamic resonant behavior due to sea states with wave excitation frequencies coinciding with the structural eigenfrequencies. In addition to significant contributions to fatigue actions, dynamic load amplification can govern extreme wind turbine responses. However, current design requirements lack specifications for assessment of resonant loads, particularly during parked or idling conditions where aerodynamic damping contributions are significantly reduced. This study demonstrates a probabilistic approach for assessment of offshore wind turbines under extreme resonant responses during parked situations. Based on in-situ metocean observations on the North Sea, the environmental contour method is used to establish relevant design conditions. A case study on a feasible large monopile design showed that resonant loads can govern the design loads. The presented framework can be applied to assess the reliability of wave-sensitive offshore wind turbine structures for a given site-specific metocean conditions and support structure design.
AB - Offshore wind turbines can exhibit dynamic resonant behavior due to sea states with wave excitation frequencies coinciding with the structural eigenfrequencies. In addition to significant contributions to fatigue actions, dynamic load amplification can govern extreme wind turbine responses. However, current design requirements lack specifications for assessment of resonant loads, particularly during parked or idling conditions where aerodynamic damping contributions are significantly reduced. This study demonstrates a probabilistic approach for assessment of offshore wind turbines under extreme resonant responses during parked situations. Based on in-situ metocean observations on the North Sea, the environmental contour method is used to establish relevant design conditions. A case study on a feasible large monopile design showed that resonant loads can govern the design loads. The presented framework can be applied to assess the reliability of wave-sensitive offshore wind turbine structures for a given site-specific metocean conditions and support structure design.
KW - Environmental contour method
KW - Probabilistic design
KW - Reliability analysis
KW - Dynamic response
KW - Offshore wind turbines
KW - Marine structures
KW - Environmental contour method
KW - Probabilistic design
KW - Reliability analysis
KW - Dynamic response
KW - Offshore wind turbines
KW - Marine structures
UR - http://www.scopus.com/inward/record.url?scp=85072851089&partnerID=8YFLogxK
U2 - 10.1016/j.apor.2019.101947
DO - 10.1016/j.apor.2019.101947
M3 - Journal article
SN - 0141-1187
VL - 93
JO - Applied Ocean Research
JF - Applied Ocean Research
IS - 2019
M1 - 101947
ER -