Analysis and Simulation of Spar Buoy Motion

Heave amplitude and roll angel of spar buoys which are popular for making stable oceanographic platforms are the most important factors affecting the quality of wireless communication above the sea surface.Analyzing the forces,moments and inertias imposed on the buoy surface,heave transfer function in vertical direction and roll transfer function in horizontal direction of the buoy are computed.Modifying the buoy structure design size,resonant frequency of buoy is deviated form the peak frequency of exciting wave spectra and the influences of excited wave to buoy motion are descended.Heave amplitude and roll angel excited by random sea states with known spectra are calculated.Experiments data agree with the computation and the models validity are proved.The influences of gravity and structure design size to the buoy motion are discussed.In the simulation,based on further communication,cylindrical buoy design recommendations were given for improvement which will improve the stability of cylindrical buoys effectively.