1. Contribution of tuned liquid column gas dampers to the performance of offshore wind turbines under wind, wave, and seismic excitations
- Author
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Khosrow Bargi, Reza Dezvareh, and Seyed Amin Mousavi
- Subjects
Engineering ,business.industry ,Mechanical Engineering ,Acoustics ,Seismic loading ,0211 other engineering and technologies ,Vibration control ,020101 civil engineering ,02 engineering and technology ,Building and Construction ,Geotechnical Engineering and Engineering Geology ,Wind engineering ,0201 civil engineering ,Vibration ,Dynamic Vibration Absorber ,Offshore wind power ,Tuned mass damper ,021105 building & construction ,Wind wave ,business ,Civil and Structural Engineering - Abstract
The main intention of the present study is to reduce wind, wave, and seismic induced vibrations of jackettype offshore wind turbines (JOWTs) through a newly developed vibration absorber, called tuned liquid column gas damper (TLCGD). Using a Simulink-based model, an analytical model is developed to simulate global behavior of JOWTs under different dynamic excitations. The study is followed by a parametric study to explore efficiency of the TLCGD in terms of nacelle acceleration reduction under wind, wave, and earthquake loads. Study results indicate that optimum frequency of the TLCGD is rather insensitive to excitation type. In addition, while the gain in vibration control from TLCGDs with higher mass ratios is generally more pronounced, heavy TLCGDs are more sensitive to their tuned frequency such that ill-regulated TLCGD with high mass ratio can lead to destructive results. It is revealed that a well regulated TLCGD has noticeable contribution to the dynamic response of the JOWT under any excitation.
- Published
- 2016
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