水产学报2011，Vol.35Issue(1)：124-130,7.DOI:10.3724/SP.J.1231.2011.17135
HDPE圆柱形网箱与圆台形网箱受力变形特性的比较
Comparison on the forces and deformation between HDPE cylinder net-cage and truncated-cone net-cage in current
摘要
Abstract
Deep-water net-cages made from HDPE, are the most widely used aquaculture facility among all kinds of anti-wave net-cages.They can be divided into cylinder net-cage and truncated-cone net-cage according to different net shapes.Comparing and analyzing the similarities and differences in the aspects of the forces and deformation between cylinder net-cage and truncated-cone net-cage, could help to provide a strong reference for the selection of cage style.Using lumped mass method and the rigid body kinematics principle,this paper described a numerical model including floating circular model as well as net model for simulating the force and deformation of net-cages in current, and the accuracy of simulation was validated by the data of marine in-situ measurements.By comparing, the numerical results of the mooring line forces on the cage were in good agreement with the in-situ test data,only 7％ of maximum relative error and 4.6％ of average relative error between them.The results indicated the numerical model and computational method adopted could meet the need of calculation accuracy for practical study.On the basis of that, under the conditions of two weight sizes( GW1 =350 kg,GW2 =600 kg)and five kinds of current velocities( U =0.3 -0.9 m/s) ,the drag forces and the volume reduction rate for cylinder net-cage and truncated-cone net-cage were calculated.In the process of simulating net, the mesh grouping method that 28 × 28 meshes have been combined into an equivalent large mesh, was applied to decrease computational time and improve efficiency.The results showed that after cages getting equilibrium in current, the two different cages in both drag force and cage volume kept the similar varying tendency with weight size or current velocity, only had little difference between them.The volume reduction rate of cylinder net-cage was much greater than that of truncated-cone net-cage.The cylinder net-cage had an obvious initial deformation when cage was only impacted by sinkers,the volume reduction rate of which was about 28％ in relatively small velocity U =0.3 m/s,but the truncated-cone net-cage had better anti-current and anti-deformation performances, with about 5％ of volume reduction rate.Therefore, to decrease the loss of net volume in current as well as manufacturing cost,selecting truncated-cone net-cages with sinkers weight mode has more advantages than cylinder net-cages with that for aquaculture.关键词
圆柱形网箱/圆台形网箱/受力变形/容积损失率Key words
cylinder net-cage/ truncated-cone net-cage/ force and deformation/ volume reduction rate分类
农业科技引用本文复制引用
黄小华,郭根喜,胡昱,陶启友,张小明..HDPE圆柱形网箱与圆台形网箱受力变形特性的比较[J].水产学报,2011,35(1):124-130,7.基金项目
国家"八六三"高技术研究发展计划(2010AA100301) （2010AA100301）
广东省科技计划项目(2008B021000042) （2008B021000042）
广东省海洋渔业科技推广专项项目(A200901G03) （A200901G03）
中央级公益性科研院所基本科研业务费专项资金项目(2010YD09) （2010YD09）
