拖曳系统拖曳动态过程仿真分析

Dynamical simulation of towed and tethered cable systems

对于海洋缆索系统,论文针对传统有限段法的不足,提出改进的缆索有限段法,缆索离散为若干弹性缆段组成的多柔体系统,根据缆索的特点选择适当的参考系和广义速率,引入有限元法中的形函数描述段内各点位移,根据Kane方程推导改进缆索有限段模型的运动方程。基于改进的缆索有限段法,提出了模拟拖曳缆索释放-回收过程的变拓扑结构模型,即用可变长度缆段长度的变化和缆段数量的改变建模缆索的释放和回收过程。文中对一海洋拖曳系统进行了动力学仿真,与海洋试验结果比较验证了模型的正确性。

As for marine cable systems, an improved finite segment method is developed to make up the deficiencies of conventional finite segment method, applying. Cable is treated as a flexible multi-body system composing elastic segments. With selecting appropriate generalized velocities according to cable properties and introducing shape functions in FEM to describing displacements of any point of a segment, the governing equations are obtained based on Kane's equation. Based on improved finite segment method, a model with variable topology is developed to model the process of pay-out/reel-in of towed and tethered systems. By changing the length of the segment with varying lengths and increasing or decreasing the numbers of segments of discrete model, the process of reel-in or pay-out is simulated. The results are compared favorably with experimental data. The effectiveness and validity of the theories are verified.