频域内海洋资料浮标垂荡运动特性研究

Heave motion performance of ocean data buoy in frequency domain

随波性作为海洋资料浮标的重要设计参数,影响着波浪参数的测量准确度。本文应用三维势流理论计算了圆盘浮标体的附加质量、兴波阻尼系数等水动力系数以及波浪激励力,基于单自由度运动方程研究了自由浮标的垂荡响应。考虑锚链垂向弹性回复刚度系数对浮标垂荡的影响,研究了两种类型系泊浮标在波浪中的垂荡运动响应。研究发现,直径3 m浮标较直径10 m浮标具有更好的随波性,且锚链对3 m浮标的垂荡运动的影响较10 m浮标更为显著。研究结果对波浪传感器的参数修正具有重要意义。

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.