Bionic design of undulating fin propeller for underwater observation vehicles
To address the issues of high noise,poor stability,and strong destructiveness of traditional propeller thrusters,a bionic undulating fin of underwater observation robot was studied.Edge extraction algorithm and CT scanning method were used to analyze and extract the morphological and structural features of the apteronotus albifrons.A two-degree-of-freedom fin actuator unit was designed to reconstruct the mechanical structure of bionic undulating fin.Hydrodynamic simulation tests were conducted to analyze the propulsion mechanism and performance,investigating the factors that influence thrust.Results indicated that the average resistance of the bionic undulating fin was 3.88 N,less than that of a rectangular undulating fin.The peak-to-valley difference in average velocity was less than rectangular undulating fin.The thrust coefficient showed negative correlations with Reynolds number and wavelength,and positive correlations with wave amplitude and frequency.Under the conditions of water velocity at 0.2 m/s,wave amplitude of 60°,wavelength of 217.5 mm,and a frequency of 4 Hz,the average propulsive force reached the maximum,up to 14.873 N.Compared to traditional fins,the undulating fins of apteronotus albifrons exhibited lower resistance and more stable speed.The morphological design and motion laws held significant value and meaning for the develop-ment of underwater observation robots.
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