Influence of connecting cable chain's elastic modulus on energy conversion of flexible floating collision-prevention system
Article Text (Baidu Translation)
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摘要: 为了研究船舶与柔性浮式防撞系统碰撞过程中能量的转换关系, 分析了连接索链弹性模量对系统消能作用的影响。在对数值计算模拟条件做出合理假设的前提下, 基于能量守恒原理, 模拟了船舶撞击柔性浮式防撞系统的运动过程, 分析了不同连接索链弹性模量条件下重力锚位移的变化规律。基于位移相似与能量等量原则, 建立了2种数学模型, 比较了数值计算结果与试验结果的差异。分析结果表明: 连接索链弹性模量衡量了其变形程度, 是影响撞击过程中船舶动能转化为弹性势能的重要因素; 在相同条件下, 连接索链的弹性模量越大, 连接索链越不易发生形变, 船舶撞击系统过程中转化为弹性势能的动能就越小, 转化为重力锚摩擦内能的动能就会越大, 各重力锚的锚位移就会越大; 通过数值计算结果与模型试验结果的比较, 模型试验中连接索链的弹性模量为260 GPa比较合适; 在保证连接索链不发生断裂的前提下, 索链的选取直接影响系统走锚的位移, 从而影响柔性浮式防撞系统的拦阻效果。Abstract: In order to study the energy conversion relations in the process of collision between ship and the flexible floating collision-prevention system (FFCPS), the influence of elastic modulus of connecting cable chain on energy dissipation was analyzed.Based on the basic principle of energy conservation, reasonable assumptions were made on the simulation conditions of numerical calculation, and the movement process of flexible floating collision-prevention system was simulated when the system was hit by ship.Under different elastic moduli of connecting cable chain, the changing rules of moving distances of gravity anchors were analyzed.2 kinds of mathematical models were established based on the principle of similarity in displacement and equality in energy, and the numerical calculation results were compared with the experiment results.Analysis result indicates that the elastic moduli of connecting cable chain measure the deformation degree of cable chain, and it is an important influencing factor in the conversion between ship kinetic energy and elastic potential energy.Under the same conditions, the bigger the elastic modulus of connecting cable chain is, the harder the deformation of connecting cable chain is, the less the energy that ship kinetic energy converts into elastic potential energy is, themore the energy that ship kinetic energy converts into friction energy is, and the longer the moving distance of gravity anchor is.Through the comparison between numerical calculation results and experiment results, the suitable value of elastic modulus of connecting cable chain in model test is 260 GPa.To be sure that the connecting cable chain cannot be broken, the selection of cable chain directly affectes the moving distance of system anchor, thus affects the arresting effect of flexible floating collision-prevention system.
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图 2 柔性浮式防撞系统模型试验
Figure 2. Model test of flexible floating collision-prevention system
图 5 数值计算与试验得到的锚位移比较
Figure 5. Comparison of moving distances of anchors between numerical calculation and experiment
图 8 数学模型与试验得到的锚位移比较
Figure 8. Comparison of moving distances of anchors between mathematical models and experiment
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