Abstract
Limited fossil resources, daily increasing rate of demand for energy and the environmental pollution fact have made people revert to renewable sources of energy as a solution. One type of renewable energy is offshore wind energy which has high potential without any sound and visual noises. Recently, a lot of researchers have carried out on the issue of offshore wind turbine. Because of incapability of most of software programs to simulate gyroscopic effect of rotating rotors, in this articles a significant effort has been made to fabricate and test an offshore wind turbine under different rotor rotation velocities and different heading angle of wind so as to obtain the effects of these parameters on structure responses. Study on the response of a wind turbine under environmental loads has had a notable importance due to the fact that structure behavior can strongly affect procedure of modeling and optimizing wind turbine structures. On the other hand, frequency-domain structural response of a wind turbine can also make engineers be informed about of appropriate mooring system for a special environmental condition. Consequently, it has been observed that increasing the rotor rotation velocity leads the peak of spectrums shift to a higher frequency due to the gyroscopic effect appeared as a damping term, and changing heading angle of wind may lead to a change in heave and pitch amplitudes in the time domain response, and heave, sway and surge motion in frequency response.
Highlights
Nowadays, environmental pollution of fossil fuels has leaded many researchers to focus on renewable energy
It has been observed that increasing the rotor rotation velocity leads the peak of spectrums shift to a higher frequency due to the gyroscopic effect appeared as a damping term, and changing heading angle of wind may lead to a change in heave and pitch amplitudes in the time
Environmental pollution of fossil fuels has leaded many researchers to focus on renewable energy
Summary
Environmental pollution of fossil fuels has leaded many researchers to focus on renewable energy. Among different types of renewable energy, offshore wind has drawn attention of many researchers to itself due to high potential of wind in offshore areas, whereas it has no acoustic and optical noises. Offshore wind energy has been found as an appropriate substitution to fulfill this demand. It has conducted a lot of studies on the FOWT (Floating Offshore Wind Turbine) responses in a variety of sea conditions. Experimental investigation has been conducted on a TLP FOWT with conical substructure moored by a spring tension leg, subjected to the wave, wind and rotor rotating loads (Shin 2011). The RAOs of structure motions have been obtained and discussed. Their results have shown that the new concept has had a good stability and decent responses. The FAST ADAMS code has been used for calculating the aerodynamic loads and WAMIT code has
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