【作者】 杨侠；

【导师】 叶恒奎；

【作者基本信息】 华中科技大学 ， 船舶与海洋结构物设计制造， 2006， 博士

【摘要】 本文针对现有船用螺旋桨、泵喷等常规推进器存在噪音大、浅水中船舶推进效率不高以及尾迹明显等缺点,提出一种新型仿生推进装置—仿鱼尾柔性尾鳍推进装置,并据此展开了对单翼板柔性尾鳍和双翼板柔性尾鳍模型的计算和实验研究,本文工作属于鱼类生物流体力学、机械学、材料学和控制技术等多学科交叉的一个新兴研究领域。本文工作的目的是:分析翼板柔性尾鳍模型的水动力推进性能,希望可以为水下潜器等实施一种新型推进方式提供一定的理论及实验依据。文中先通过对单翼板柔性尾鳍波状运动进行了理论与实验分析,找出了各个运动因素以及结构因素对推进性能的影响,然后进一步通过对双翼板的水动力计算找出翼板拱度形状等因素在推进中所起作用;全文采用面元(涡格)法来分析和求解作用在水翼上的水动力系数,在模型处理上作者作了一定的改进。本文的主要工作是:1、对现有的水下推进方式现状、优缺点等进行了回顾和分析,结合仿生学原理,论证了采用尾鳍式推进的优越性,并介绍了当前国内外对该领域的研究概况;2、介绍水动力计算中常用的理论方法,并重点介绍了本文中数值分析所采用的方法-涡环栅格法(VLM),为后续的理论分析与计算工作作准备;3、在继承国内外学者对鱼类游动机理研究成果的基础上,结合船舶结构与船型的实际应用要求,提出单翼板柔性尾鳍模型,通过对单翼板柔性尾鳍的水动力计算及其模型装置的水池实验,初步分析得出摆推式水翼水下的运动机理,分析中作者采用了自己提出的非线性性尾涡面假定,并分别对不同频率、不同来流速度、不同的摆幅等工况进行了实验分析,找出了各个运动因素和结构因素等对水动力推进性能的影响关系;4、更进一步,提出双翼板柔性尾鳍模型,并进行了双翼板(局部柔性)柔性尾鳍的水动力理论计算分析,提出了双翼板柔性尾鳍装置的机构优化设计方法及其运动规律,给出了相关计算结果,该部分重点研究双翼板的拱度变化对水动力推进性能的影响,目的是希望找水动力性能最优的拱度变化规律,为以后的多翼板柔性尾鳍模型的机构设计优化、拱度变化规律设计等提供计算依据和参考,并为真正的仿生柔性尾鳍推进运动规律提供理论依据。更多还原

【Abstract】 A new bionics propulsion equipment—fishlike flexible tail fin propulsion equipment is brought forward,because there are some problems in present thrusters,such as big noise,low propulsion efficiency in shallow water and evident wake.The computation and experimental study on the single-hydrofoil flexible tail fin model and the doule-hydrofoil flexible tail fin model have been made in the following work.The work of the article is involved in fish biomechanics, machine, material,control technology and so on.The intention of the article is to analyse the hydrodynamics performance of hydrofoil flexible tail fin model and to provide some proofs for the new bionics propulsion method.The first step of the article is to analyse the single-hydrofoil flexible tail fin in theory and experiment, and some influence upon propulsion performance induced by movement and structural factors. The second step of the article is to make hydrodynamics computation on double-hydrofoil flexible tail fin and find the contribution to propulsion performance mady by arch degree of tail fin.The vortex lattice method is used in the article, and some reformation is done in numerical model.The main work of the article includes:1.background and shortcomings in present propulsion mothods,the merits of tail fin propulsion and the general situation in its study;2.the introduction of usual methods in analyzing hydrofoil propulsion,especial vortex lattice method(VLM);3.putting forword single-hydrofoil flexible tail fin model based on inheriting the former’s study achievements and applied requirement in ship shape, numerical computation & experiment study of single-hydrofoil flexible tail fin, and applying nonlinear trailing vortex surface in static water.4.bringing forward double-hydrofoil flexible tail fin model,making computation,giving the result and providing the proof for the next work—multi-hydrofoil flexible tail fin study.更多还原