圆柱形浮标运动分析与仿真

Analysis and Simulation of Spar Buoy Motion

圆柱型浮标通常作为海洋监测设备的稳定工作平台,对波浪激励下浮标的升沉运动位移和横摇角度会影响空中无线通信质量。针对浮标加强姿态稳定性要求,通过对浮标体在波浪中的受力分析、力矩与惯量分析,建立浮标运动传输函数模型,讨论浮标重力、设计尺寸对浮标运动的影响。通过浮标设计参数的调整,通过浮标固有的谐振频率与波浪激励的峰值频率分离,降低波浪激励对浮标运动的影响。计算了不同海况激励下浮标在垂直方向的升沉位移与水平方向的横摇角度,与实验数据验证仿真方法的有效性,在仿真的基础上,进一步给出了圆柱形通信浮标的设计改进建议,有效地提高了圆柱型浮标的稳定性。

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 farther communication, cylindrical buoy design recommendations were given for improvement which will improve the stability of cylindrical buoys effectively.