Piezoelectric coupling propulsion mechanism of bionic ray pectoral fins

Abstract

The invention discloses a ray pectoral fin-imitated piezoelectric coupling propulsive mechanism. The ray pectoral fin-imitated piezoelectric coupling propulsive mechanism comprises a crankshaft, guide rods, a swinging block, a piezoelectric compound fin, a fish body pedestal, a crankshaft support, a driving motor, a battery pack and a main control panel, wherein the crankshaft is arranged on the crankshaft support; the swinging block comprises a pin shaft and a swinging block support; the pin shaft is arranged on the swinging block support; the crankshaft support and the swinging block support are fixedly arranged on the fish body pedestal; one of the guide rods is arranged between one end of the swinging block and the crankshaft; the driving motor and the crankshaft are connected through a gear; the piezoelectric compound fin is arranged at the other end of the swinging block; the battery pack can provide a direct current power source; the main control panel is electrically connected with the piezoelectric compound fin; the crankshaft is a four-turn crankshaft; the guide rod is arranged on each turning shaft of the four-turn crankshaft. The ray pectoral fin-imitated piezoelectric coupling propulsive mechanism can reduce the structural size, the weight of the fish body, and can realize chordwise fluctuation propulsion.

Description

technical field [0001] Specifically, the present invention relates to a piezoelectric coupling propulsion mechanism for bionic rays pectoral fins. Background technique [0002] Fish swim flexibly, efficiently, and without noise. Many of its advantages can be applied to underwater scientific research, survey, rescue and other fields. Existing bionic fish prototypes using pectoral fin swing propulsion mode have not yet reached the level of their natural prototypes in terms of speed, propulsion efficiency, maneuverability, etc., and there is still a certain gap from practical application. Its propulsion performance needs to be further improved, and the research on the propulsion mechanism will continue to deepen. In view of the characteristics of the pectoral fin swing propulsion mode, as well as the potential advantages and broad application prospects of the bionic fish developed using it as a prototype, the bionic fish using this propulsion mode Research has gradually gained...

AI Technical Summary

Problems solved by technology

However, there may be some invalid deformation on the flexible fin surface, or the fluctuating range of the fin surface is too small to generate enough propulsion. These problems are mainly due to the design of material selection and driving method

[0004] The dynamic waves of pectoral fin propelling rays are distributed in two directions of the fin surface, ie, chord direction and span direction. Rigid fin rays can only realize chord direction fluctuations, but cannot achieve span direction fluctuations. It will make the structure contain too many connecting parts and power sources, resulting in too complicated structure

In order to reduce the number of components and control the number of motors, many current studies use piezoelectric materials (PZT), shape memory alloys (SMA) and artificial muscles (IPMC) as flexible fin materials, using voltage and temperature changes to control the movement of the fin surface to form the fin surface However, in order to achieve larger and faster deformation response requirements, there must be a higher voltage source and high-frequency changing voltage and temperature, and at the same time, it must be ensured to overcome the influence of water resistance during the propulsion process, resulting in too small propulsion force Happening

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