Abstract:
Semi-submersible platforms face risks of mooring failure and motion instability caused by the combined action of waves and currents in exposed sea conditions. To verify the hydrodynamic performance of a retractable aquaculture platform, physical model tests were conducted to evaluate its behavior under three typical operational conditions: maintenance, floating, and seabed-resting. A 1:75 scale model was used to measure the platform’s six-degree-of-freedom motion responses and the dynamic characteristics of mooring line tensions. The results show that under maintenance and floating conditions, the combined action of waves and currents leads to the maximum mooring forces, while different load combinations have little impact on the platform’s motion. The wave period significantly affects mooring forces and pitch motion but has a minor influence on linear displacements. Under the combined action of waves and currents, mooring forces and linear displacements increase with wave period, whereas the opposite trend is observed under pure wave conditions. In the seabed-resting condition, the platform’s surplus weight provides strong resistance to sliding and overturning, with negligible motion and mooring forces. A comparison of the platform’s dynamic responses under maintenance and floating conditions reveals that under pure current or combined wave-current conditions, increasing the draft heightens mooring forces and exacerbates pitch motion while limiting linear displacements. In contrast, under pure wave conditions, increasing the draft reduces motion responses and mooring forces. The study confirms that the stability of the six-point mooring system and the strength of the mooring chains meet the design requirements, providing a basis for platform construction.
Key words:
semi-submersible platforms,
regular waves,
physical modeling tests,
combined wave and current action
摘要： 半潜式平台在无遮蔽海况下面临波流联合作用引发的系泊失效与运动失稳风险。针对可升降式养殖平台设计方案，通过物理模型试验校核其在维修、漂浮、坐底三类典型工况下的水动力性能。试验采用1:75缩尺模型，测量平台6自由度运动响应及系泊链张力动态特征。结果显示：维修和漂浮工况下，波流联合作用导致锚泊力达到最大，且不同荷载组合对平台运动的影响很小。波浪周期对锚泊力及纵摇影响显著，但对线位移影响较小。波流联合作用下，锚泊力和线位移随波周期增大而增加，而在纯浪作用下，这一趋势则相反。坐底工况下，平台具有富裕重力，抗滑和抗倾覆性能较强，运动量和锚泊力可忽略。对比了维修状态和漂浮状态的平台动力响应，在海流或波流联合作用下，增加吃水会增大锚泊力并加剧纵摇，同时限制线位移，而在纯浪作用下，增加吃水深度会减小运动响应和锚泊力。研究结果验证了6点系泊方案的稳定性和锚链强度均满足设计要求，为平台建设提供了依据。
关键词:
半潜式平台,
规则波,
物理模型试验,
浪流联合作用
SONG Zhengrong1, TANG Mingfu2, HU Xingtao1, LIU Junfei3, MEI Huadong1, ZHENG Zhenjun4, YANG Chuandong4. Physical modeling study of hydrodynamic characteristics of a semi-submersible aquaculture platform in waves and current#br#
#br#
[J]. Fishery Modernization, 2025, 52(3): 53-.
宋峥嵘[], 唐鸣夫 2, 胡性涛1, 刘俊斐3, 梅华东1, 郑振钧4, 杨传东4. 波流作用下半潜式养殖平台水动力特性物理模型试验[J]. 渔业现代化, 2025, 52(3): 53-.