Abstract
The coupled analysis between a turbine in operating condition and a complex jacket support structure was formulated in this paper for the reliable evaluation of offshore wind turbine structures including pile-soil-structure interactions (PSSIs). Discussions on the theoretical and simulation aspects of the coupled analysis are presented. The dynamic coupled analysis was implemented in X-SEA program and validated with FAST v8 (fatigue, aerodynamics, structures and turbulence) developed by NREL, USA. By replacing the sub-structural module in the FAST with the component of offshore substructure in the X-SEA, the reaction forces and the turbine loads were calculated in each time step and the results from X-SEA were compared with that from FAST. It showed very good agreement with each other. A case study of a NREL 5MW offshore wind turbine on a jacket support structure was performed. Coupled dynamic analyses of offshore wind turbine and support structures with PSSI were carried out. The results showed that in the coupled analysis, the responses of the structure are significantly less than in the uncoupled analysis. The support structure considering PSSI exhibited decreased natural frequencies and more flexible responses compared to the fixed-support structure. The implemented coupled analysis including PSSI was shown to be more accurate and computationally efficient.
Highlights
In order to construct an offshore wind turbine (OWT), an engineer should select a proper support structure concept
Analysisweight and design of scour, ship with collision, complexity joints, deflection tower the topstructural and overall of jacket foundations are more complicated than other foundation concepts, which may push up the in this paper focuses on jacket-foundation supported OWTs
In order to cope with the excessive computation times on complex foundation types such as jackets and tripods, super element modeling was combined with the concept of modal truncation augmentation using the Craig-Bampton method, which consists in extending the reduction basis by adding ‘residual vectors’ [8]
Summary
In order to construct an offshore wind turbine (OWT), an engineer should select a proper support structure concept. Structural analysis design of jacket dynamic responses were significantly over-predicted In their second decoupling method, the thrust foundations are more complicated than other foundation concepts, which may push up the costs of and torque from an isolated rotor model were used as wind loads and a linear damper was introduced to account theare aerodynamic damping. The coupled dynamic analysis of OWTs cansignificantly over-predicted In their second decoupling method, the thrust and torque from an isolated rotor model were used as wind loads and a linear damper was introduced to account for the aerodynamic damping. In order to cope with the excessive computation times on complex foundation types such as jackets and tripods, super element modeling was combined with the concept of modal truncation augmentation using the Craig-Bampton method, which consists in extending the reduction basis by adding ‘residual vectors’ [8]. By replacing the sub-structural module in the FAST v8 program with the component of offshore substructure in the X-SEA program using the present study driver, the reaction force and the turbine load and response will be compared in each time step and compared with X-SEA and FAST v8 programs
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