Abstract
The dynamic characteristics of a bottom-fixed offshore wind turbine (OWT) under earthquakes are analyzed by developing an integrated analysis model of the OWT. Further, the influence of the interactions between the rotor and support system on the structural responses of the OWT subjected to an earthquake is discussed. Moreover, a passive control method using a tuned mass damper (TMD) is applied to the OWT to control the responses under earthquakes. The effects of the mass ratio, location and tuned frequency of the TMD on controlling structural responses of the OWT under different recorded seismic waves are studied.
Highlights
Earthquakes are potential risk factors for offshore wind farms in the coastal regions of China, such as the Bohai bay
According to the dynamic characteristics of nacelle acceleration (NAA) under the El centro seismic wave shown in Figure 8, the frequency component of 0.305 Hz and 0.742 Hz is discovered to be the dominant frequencies of the response which is the first two natural frequencies of offshore wind turbines (OWT), respectively
A tuned mass damper (TMD) is mounted on the OWT to control the structural responses under different seismic excitations
Summary
Earthquakes are potential risk factors for offshore wind farms in the coastal regions of China, such as the Bohai bay. The dynamic model tests of the OWT under combined seismic, wind, and wave loads were performed by Prowell et al [6,7], Zheng et al [8], and Wang et al [9,10]. Zheng et al [8] experimentally researched the interaction of seismic and wave loads, and recommended that proper combinations of these loads should be applied in the seismic analysis of OWTs to obtain realistic structural responses. Wang et al [9,10] performed a series of model tests of OWTs under combined seismic, wind, and wave loads, discovered the aerodynamic and hydrodynamic damping effects, and concluded that the aerodynamic and hydrodynamic loads may have comparable effects on the responses when the peak ground acceleration (PGA) of the seismic excitation is small. The influence of the TMD parameters on the structural responses control of the OWT under different seismic waves are discussed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
