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桩柱式围网养殖是新兴发展的一种生态型海洋养殖模式,主体由排桩和网片组成。围网网衣系统安全是决定围网工程安全的关键所在。该文基于集中质量点法和网目群化技术,通过计算机模拟研究了桩柱式围网单元网片在水流作用下的水动力特性,分析了水流流速和流向要素对围网单元网片的网线张力分布、节点偏移和系缚点受力特性的影响。研究结果表明,网线最大张力和节点最大偏移随流速和冲角的增大而增大;网线最大张力发生处,主要位于网片上下端的两侧位置,但当冲角较小时,网线最大张力出现在网片上下端的迎流一侧。节点最大偏移发生处,主要位于网片上下端的中间部位,且不随流速变化。桩柱系缚点受力上下两端大、中间小,流速和冲角对上下两端系缚点的受力影响较大,对中间系缚点的影响较小。上述研究结果指出了围网网片及桩柱系缚点的潜在危险位置,在进行围网设计时,需给予重点关注。该文研究结果可为新型浅海围网工程设计与安装提供重要参考。
Piling fence farming is a newly developed eco-type marine culture mode, the main body by the row of piles and mesh composition. Sewer network system security is the key to determine the safety of the seine. Based on the mass point method and mesh grouping technique, this paper studies the hydrodynamic characteristics of the piled net unit mesh under water flow by computer simulation, and analyzes the influence of flow velocity and flow direction on the net unit mesh The influence of the tension distribution of network cable, the node offset and the force characteristics of tie-down point. The results show that the maximum tension of network cable and the maximum offset of nodes increase with the increase of flow rate and angle of attack. The maximum tension of cable occurs at both sides of the upper and lower ends of the mesh. However, when the angle of attack is small, Appear in the mesh on the lower side of the Ying Ying side. Node maximum offset occurs, mainly located in the middle of the upper and lower parts of the mesh, and does not change with the flow rate. The upper and lower ends of the pintle tied point are large in the middle and small in the middle. The flow velocity and the angle of attack have a great influence on the forces at the tie points at the upper and lower ends of the pile, and have less influence on the tie points of the middle tie. The results of the above studies point out the potentially dangerous locations of the fencing grids and the tie-down points of the piles and should be given special attention when designing the fencing. The results of this paper can provide important reference for the design and installation of a new shallow seine network.