Seismic Loading for FAST: May 2011 - August 2011

Asareh, M. A. ; Prowell, I.

关键词: AERODYNAMICS;    DESIGN;    EARTHQUAKES;    MODIFICATIONS;    ROTORS;    SIMULATION;    WIND TURBINE ARRAYS;    WIND TURBINES;    WIND POWER WIND TURBINES;    WIND FARMS;    SEISMIC LOADS;    MODELS;    Wind Energy;   

DOI  :  10.2172/1050131
RP-ID  :  NREL/SR-5000-53872
PID  :  OSTI ID: 1050131
Others  :  Other: AFT-1-11324-01
Others  :  TRN: US201218%%647

学科分类：再生能源与代替技术

美国|英语

来源: SciTech Connect

【 摘 要 】

As more wind farms are constructed in seismically active regions, earthquake loading increases in prominence for design and analysis of wind turbines. Early investigation of seismic load tended to simplify the rotor and nacelle as a lumped mass on top of the turbine tower. This simplification allowed the use of techniques developed for conventional civil structures, such as buildings, to be easily applied to wind turbines. However, interest is shifting to more detailed models that consider loads for turbine components other than the tower. These improved models offer three key capabilities in consideration of base shaking for turbines: 1) The inclusion of aerodynamics and turbine control; 2) The ability to consider component loads other than just tower loads; and 3) An improved representation of turbine response in higher modes by reducing modeling simplifications. Both experimental and numerical investigations have shown that, especially for large modern turbines, it is important to consider interaction between earthquake input, aerodynamics, and operational loads. These investigations further show that consideration of higher mode activity may be necessary in the analysis of the seismic response of turbines. Since the FAST code is already capable of considering these factors, modifications were developed that allow simulation of base shaking. This approach allows consideration of this additional load source within a framework, the FAST code that is already familiar to many researchers and practitioners.