Abstract:

 As an important design parameter of ocean data buoy, wave following characteristic affects the accuracy of wave measurement. We calculate wave excitation force and such hydrodynamic coefficients as added mass and wave damping coefficient of disc buoy with three dimensional potential flow theory, and heave motion of free floating buoy based on single degree of freedom motion equation. We also address heave motion of two moored buoys integrated with the impact of mooring vertical spring constant on buoy heave motion. We discover that the buoy with threemeter diameter has better wave following performance than that with tenmeter diameter and that anchor chain has more significant impact on heave amplitude of threemeter diameter buoy than that of tenmeter diameter buoy. The result is very important for parameter correction of wave sensors.

Key words: heave motion response, frequency domain, ocean data buoy, spring constant