“尼罗河魔鬼”柔性长鳍运动曲面建模与仿真

以"尼罗河魔鬼"柔性长背鳍的波动运动为研究对象,综合考虑影响柔性长鳍运动建模的诸因素,建立了描述柔性长鳍波动运动时动态曲面的数学模型,并根据试验观测获得的仿生对象相关数据及对运动学模型中相关要素的简化假设,对仿生对象鱼体及柔性长鳍动态曲面进行仿真计算,通过与试验观测获得的照片进行对比,表明建立的柔性长鳍运动曲面模型通过合理设置各种参数,能够较好地描述柔性长鳍的波动运动,具有较强的适应性和通用性.柔性长鳍运动学模型的建立为其动力学研究及其基于有限元方法的仿真计算奠定了数学基础.

The Modeling and Simulation of the Movement Curved Surface of the Long Flexible Fin of Gymnarchus Niloticus

This paper establishes a uniform kinematics model to describe the undulation surfaces by the long flexible fin of Gymnarchus niloticus,with various factors comprehensively considered.Simulation is carried out using the morphological measured data and some simplified hypotheses to related factors.Compared with the filmed views,the simulation results show that the kinematics model can effectively depict the movement curved faces of the long flexible fin,and has better adaptability as well as versatility.Meaningfully,the establishment of the kinematics model for the long flexible fin has made a good preparation for further finite-element-based dynamic analysis.