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Mooring Tension and Motion Characteristics of A Submerged Fish Reef w.th Net in w.ves and Currents Using Numerical Analysis

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China Ocean Engineering 2012年第2期26卷 261-276页

作者： Tae Ho Kim david w.fredriksson Judson DeCew. School of Marine Technology Chonnam National University Department of Naval Architecture and Ocean Engineering United States Naval Academy Annapolis Center for Ocean Engineering University of New Hampshire

A numerical model w.s used to analyze the motion response and mooring tension of a submerged fish reef system. The system included a net attached to a rigid structure suspended up from the bottom w.th a single, high tension mooring by fixed flotation. The analysis w.s performed by using a Morison equation type finite element model configured w.th truss elements. Input forcing parameters into the model consisted of both regular and irregular w.ves, w.th and w.thout a steady current. Heave, surge and pitch dynamic calculations of the reef structure w.re made. Tension response results of the attached mooring line w.re also computed. Results w.re analyzed in both the time and frequency domain in w.ich appropriate, linear transfer functions w.re calculated. The influence of the current w.s more evident in the tension and heave motion response data. This is most likely the result of the large buoyancy characteristics of the reef structure and the length of the mooting cable. Maximum mooting component tension w.s found to be 13.9 kN and occurred w.en the reef w.s subjected to irregular w.ves w.th a co-linear current of 1.0 m/s velocity. The results also show.d that the system had little damping （in heave） w.th damped natural periods of 2.8 s. This combination of system characteristics promotes a possible resonating situation in typical open sea conditions w.th similar w.ve periods.

关键词： floating fish reef fish aggregating device numerical model w.ves and currents net structure

Experimental Study of An Aquaculture Net Cage in w.ves and Current

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China Ocean Engineering 2015年第3期29卷 325-340页

作者： david KRISTIANSEN Pal LADER Фsten JENSEN david fredriksson SINTEF Fisheries and Aquaculture United States Naval Academy

Model experiments of a floating fish cage subjected to w.ves and current have been performed. The objective w.s to study the dynamic behaviour of the fish cage model in w.ves and current. The fish cage model w.s composed of a model net, a flexible floating collar of the circular plastic type and a w.ight system. It w.s found that there are many w.ve periods in w.ich cancellation of the w.ve-induced forces on the model occur. These cancellation w.ve periods are w.thin the range of dimensioning w.ve periods commonly used for testing of fish farm structures and hence are important to be aw.re of. Large deformations of the net under realistic w.ve and current conditions w.re observed, w.ere contact betw.en the net and other parts of the structure w.re identified. This may cause damages to the net due to abrasion.

关键词： aquaculture structure hydrodynamic loads hydroelasticity

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封闭箱体海洋水产养殖系统设计工序研究

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中国渔业经济 2012年第2期30卷 156-165页

作者：王洋 david w.fredriksson 中国水产科学研究院渔业工程研究所美国海军学院船舶与海洋工程系

本文旨在研究海水环境中刚性封闭箱体水产养殖系统的潜在设计工序。封闭箱体水产养殖技术通过限制并操控养殖鱼类与外部水环境相互作用以将环境影响最小化。系统的箱体单元通常紧密排布并锚泊到海底。研究关注的地理区域在加拿大不列颠... 详细信息

本文旨在研究海水环境中刚性封闭箱体水产养殖系统的潜在设计工序。封闭箱体水产养殖技术通过限制并操控养殖鱼类与外部水环境相互作用以将环境影响最小化。系统的箱体单元通常紧密排布并锚泊到海底。研究关注的地理区域在加拿大不列颠哥伦比亚省乔治亚海峡。本文研究了含多个单元的箱体水产养殖系统的设计构造。设计程序包括检验以下内容:当地环境条件;多个箱体单元上受到的阻力;波浪荷载;无阻尼升沉运动;锚泊设备组件;刚性控制结构的材料应力。还讨论了操作以及其它设计要素。初步研究结果表明波浪力是至关重要的。

关键词：封闭控制沿海水产养殖近岸渔业生产计算流体力学波浪力