Hydraulic drive body-tail fin mode bionic underwater thruster

Abstract

A bionic underwater propeller in a way of hydraulic driving body tail fins comprises more than two sections of swing devices, a tail fin and a hydraulic control unit. The swing device comprises a T-shaped stent and two hydraulic oil cylinders arranged symmetrically on the T-shaped stent; the ends of all the T-shaped stents of the swing device are sequentially articulated with the beginning end; between the adjacent T-shaped stents, relative rotation can be done; one end of the hydraulic oil cylinder is articulated with the T-shaped stent and the other end is articulated with the T-shaped stentof the next section of the swing device by means of a piston rod; each hydraulic oil cylinder is respectively provided with a nozzle tip joint connected with the hydraulic control unit; in the same moving period, when the piston rod of the hydraulic oil cylinder is in an extending stroke, the piston rod of the other hydraulic oil cylinder is in a retraction stroke; the tail fin is connected withthe last section of the swing device. The bionic underwater propeller has the advantages of compact structure and high transmission efficiency, which can flexibly imitate the tail fin way of fish bodyto move, thus providing propulsive forces for the movement of in-water aircrafts.

Description

technical field [0001] The invention mainly relates to the design field of a bionic underwater propeller, in particular to a bionic underwater propeller in the form of hydraulically driving the caudal fin of a body. Background technique [0002] At present, many scientific research institutions at home and abroad carry out research on the propulsion of underwater organisms such as tuna, sharks, and dolphins, and have developed some robotic fish, fish-like robots, or bionic underwater propellers. A large number of experiments have shown that the underwater thruster imitating the fish body-caudal fin (BCF) propulsion method has the characteristics of high efficiency, small fluid disturbance, and good maneuverability. However, there are still some defects in these devices. For example, each joint in the device is driven by a motor, and the reciprocating swing is realized by a cam swing mechanism. It has large energy loss, low efficiency, low swing frequency, and rigid and infle...

AI Technical Summary

Problems solved by technology

However, there are still some defects in these devices. For example, each joint in the device is driven by a motor, and the reciprocating swing is realized by a cam swing mechanism. It has large energy loss, low efficiency, low swing frequency, and rigid and inflexible movements. It is difficult to get out of the experiment. room and apply it in actual engineering practice

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