Transient response of a TLP-type floating offshore wind turbine under tendon failure conditions

Among various types of floating offshore wind turbines (FOWTs), the tension leg platform (TLP) have relatively small motions due to stiff tendons. Similar TLP applications in industry, tendon failure may lead deteriorated stability and large transient responses, which should be considered as part accidental limit state (ALS) checks at design stage FOWTs. This paper takes WindStar system a representative investigates effects one-tendon on responses. A coupled numerical model is first established using aero-hydro-servo-elastic simulation tool FAST. Subsequent simulations are carried out consider different breakage turbine shutdown scenarios both operational parked conditions. Response statistics key parameters including motion, nacelle acceleration, analyzed. The results indicate that several responses FOWT under conditions even higher than extreme values 50-year Our analyses also reveal strategies, if not applied appropriately, limited reducing FOWT, thus certain threaten safety closest broken no other actions taken. For ALS requirements dominate over ultimate requirements. These findings can relevant