浅水FPSO垂荡和纵摇运动的低频响应  

Low frequency heave and pitch motions of FPSO in shallow water

作　　者：肖龙飞[1] 杨建民[1] 郭彬[1] 

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200030

出　　处：《舰船科学技术》2009年第11期120-124,共5页Ship Science and Technology

基　　金：国家自然科学基金项目(50879045);上海市自然科学基金项目(07ZR14048)

摘　　要：对软刚臂系泊FPSO在浅水不规则波作用下的垂荡和纵摇运动响应进行数值计算与模型试验研究,水深16.7m。试验中的波浪校验结果显示,在波浪谱中出现明显低频长波成分。计算结果与试验结果均显示,垂荡和纵摇波浪力、运动响应既有传统的波频成分,也出现显著低于波浪频率的低频成分,而且低频响应的能量和幅值甚至会远大于波频响应。垂荡和纵摇运动的低频响应不具有能量集中的共振频率,而是具有较宽的低频能量分布。这种显著低频响应的出现,与浅水中低频长波的存在有关,表明其不仅对系泊FPSO水平面运动性能影响极大,也会显著影响垂荡和纵摇这类垂直面运动的波浪力和运动响应,在理论预报时需要予以重视。The low frequency response of heave and pitch motions of a soft yoke moored FPSO exposed to irregular waves in shallow water is investigated by conducting numerical computations and wave basin model tests. The water depth is 16.7 m. In terms of the measured wave spectrum by wave calibration in the wave basin, it can be seen that an obvious low frequency part exists. Both numerical and experimental results show that the wave excitation forces and the wave induced motions for heave and pitch include not only traditional wave frequency response but also low frequency response. Furthermore, the energy and the amplitude of low frequency response are much larger than wave frequency ones. The low frequency response of heave and pitch motions is distributed over a wide range of frequencies, which include no dominant resonance frequency. The existence of low frequency long waves in shallow water affects notably the motions not only in horizontal plane but also in vertical plane, such as heave and pitch. Therefore, the incident waves in shallow water should be taken into account carefully in the prediction of the hydrodynamic response of a single point moored FPSO.

关 键 词：FPSO 浅水 低频响应 运动 波浪力 

分 类 号：P351[天文地球—空间物理学]