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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2019, Vol. 53 Issue (5): 872-879    DOI: 10.3785/j.issn.1008-973X.2019.05.007
    
Design and hydrodynamic analysis of pectoral fin oscillation propulsion mechanism of bionic manta ray
Zhong YUN(),Meng WEN,Yi JIANG,Long CHEN,Long-fei FENG
College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
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Abstract  

A bionic pectoral fin oscillation propulsion mechanism of manta ray and its swing mode were designed to improve the propulsive efficiency of unmanned undersea vehicle (UUV). A crankshaft joint crank rocker mechanism, which achieved mutual decoupling between swing amplitude and jerk factor, was designed to achieve the specific swing mode of the bionic pectoral fin, based on the study of the pectoral fin movement mechanism of manta rays. The motion equation of the bionic pectoral fin was derived and established, and the hydrodynamic performance of unilateral pectoral fin in the swing mode was analyzed by numerical simulation, and the superiority of this swing mode relative to the sine swing mode was verified according to the set propulsion performance evaluation index. The advancement and steering performance of the device was verified by the experiments, and the relationship between the amplitude and frequency of the pectoral fin swing as well as the speed of the device was analyzed. Experimental results showed that the bionic pectoral fin oscillation propulsion mechanism can realize the predetermined movement of UUV, such as advancement and steering, and meet the basic propulsion requirements.

Key words： bionic manta ray      pectoral fin oscillation propulsion      numerical simulation      performance analysis      Fluent     
Received: 30 March 2018      Published: 17 May 2019
CLC:  Q 35  
  TP 24  
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Zhong YUN
Meng WEN
Yi JIANG
Long CHEN
Long-fei FENG
Cite this article:

Zhong YUN,Meng WEN,Yi JIANG,Long CHEN,Long-fei FENG. Design and hydrodynamic analysis of pectoral fin oscillation propulsion mechanism of bionic manta ray. Journal of ZheJiang University (Engineering Science), 2019, 53(5): 872-879.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.05.007     OR     http://www.zjujournals.com/eng/Y2019/V53/I5/872


仿生蝠鲼胸鳍摆动推进机构设计与水动力分析

为了提高水下无人航行器推进系统效率，设计仿生蝠鲼胸鳍摆动推进机构及其摆动形式. 在研究蝠鲼胸鳍运动机理的基础上，设计摆动幅值与急回系数相互解耦的曲轴联合曲柄摆杆机构，以实现仿生胸鳍的特定摆动形式. 推导并建立仿生胸鳍的鳍面运动方程，利用数值仿真分析单侧胸鳍在该摆动形式下的水动力特性，根据设定的推进性能评价指标说明该摆动形式相对正弦摆动形式的优越性. 通过实验验证装置的前进、转向等运动性能，分析胸鳍摆动幅值、频率与运动速度的关系. 结果表明，在特定的摆动形式下，该仿生胸鳍摆动推进机构能够实现水下无人航行器的前进、转向等预定运动，满足基本推进要求.


关键词： 仿生蝠鲼,  胸鳍摆动推进,  数值仿真,  性能分析,  Fluent 
Fig.1 Concept map of movement of pectoral fin of manta ray
Fig.2 Body size ratio of manta ray
Fig.3 Schematic diagram of pectoral fin oscillation propulsion mechanism of bionic manta ray
Fig.4 Schematic diagram of kinematic relationship of crank
Fig.5 Movement sequence for span of pectoral fin
Fig.6 Calculate domain mesh configuration for pectoral fin swing simulation
Fig.7 Pressure contours of upper surface with pectoral fin flapping at different times
Fig.8 Force diagram of right pectoral fin during underwater movement
Fig.9 Hydrodynamic simulation curve of pectoral fin swing
Fig.10 Variation curve of hydrodynamic parameters of pectoral fin versus swing frequency
Fig.11 Experimental scene of propulsion device of bionic manta ray
Fig.12 Relationship between theoretical input torque as well as power and crankshaft rotate speed
Fig.13 Motion sequence for forward movement of device
Fig.14 Motion sequence for steering movement of device
Fig.15 Variation curve of device speed versus swing frequency of pectoral fin
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