大型框架式渔业平台水动力分析及其系泊系统设计  

Hydrodynamic analysis of huge-framed offshore aquaculture platforms and design of their mooring systems

作　　者：俞俊 程小明[1] 张凯[1] 倪歆韵[1] 苗玉基 刘小龙[1] YU Jun;CHENG Xiao-ming;ZHANG Kai;NI Xin-yun;MIAO Yu-ji;LIU Xiao-long(China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心,江苏无锡214082

出　　处：《船舶力学》2023年第10期1475-1486,共12页Journal of Ship Mechanics

基　　金：工信部高技术船舶科研项目(工信部联装[2019]360)。

摘　　要：为获得恶劣海洋环境的载荷,需对大型框架式渔业平台主体框架和网衣的复杂水动力特性加以分析,以设计合理、经济的系泊系统。引入莫里森公式计算主体框架和复杂网衣所受的拖曳力和惯性力,通过三个方向的等效水动力系数,考虑平行于网面的遮蔽效应,建立精确模拟大型框架式渔业平台水动力特性的模型。模拟渔业平台自由衰减的数值分析结果表明,其垂荡、纵摇和横摇运动自然周期远大于常规浮式结构物。在此基础上设计综合采用聚酯、锚链的平行式复合系泊系统,赋予整个系统在横向较小的刚度。通过对渔业平台在不同环境条件下遭受的水动力和系泊张力进行的3小时时域数值分析评估,结果表明缆绳张力满足设计要求:完好状态下保险系数为2.07,单缆破断下保险系数为1.463。As offshore aquaculture platforms typical of huge-framed structures which support the net are being deployed further offshore,the hydrodynamic performance of the platforms is quite complex and yet very important to the adequate design of the platforms and their mooring systems as any significant underdesign or overdesign of the platforms and mooring systems can incur serious economic consequences.A method based on Morison equation was proposed for the assessment of the hydrodynamic loads on the aquaculture platforms including their frames and nets.A Morison model for an aquaculture platform was constructed,which could take into account the sheltering effect due to the surrounding net or beams through the equivalent hydrodynamic coefficients in three directions.The numerical analysis results of free attenuation show that the natural periods of heave,pitch and roll are far greater than those of conventional floating structures.A mooring system combining polyester with chains was designed to endow the whole system with less rigidity in transverse direction,followed by the time domain analysis to assess the hydrodynamic forces and mooring system performance in various environmental conditions.The numerical results indicate that the mooring tension can meet the design requirements,the safety factor of cable in good condition is 2.07,and the safety factor with one line broken is 1.463.

关 键 词：渔业平台 水动力分析 莫里森单元 平行式系泊设计 

分 类 号：TV131.2[水利工程—水力学及河流动力学]