Bending and torsion composite piezoelectric energy harvester capable of improving energy harvesting capability

Abstract

The invention provides a bending and torsion composite piezoelectric energy harvester capable of improving energy harvesting capability, belongs to the technical field of water flow and air flow induced vibration energy harvesting and solves the problem that a conventional single piezoelectric cantilever beam is low in energy harvesting efficiency, and the problems that a series-type piezoelectricenergy harvester only perform bending motion, there is no influence relation between the cantilever beams, the series structure occupies large area, and structure stiffness is reduced easily by the series state, which causes structure instability. The technical main points are that a transverse piezoelectric cantilever and a longitudinal piezoelectric cantilever are arranged in a vertically-intersecting manner, achieve linkage through a positioning limiter and can carry out bending and torsion motion at the same time; a pin fin is connected in series with one end of the transverse piezoelectric cantilever, and the series connection direction is same as the water flow and air flow direction; the other end of the transverse piezoelectric cantilever establishes connection with a base througha main clamp; and the longitudinal piezoelectric cantilever establishes connection with the base through an auxiliary clamp. The bending and torsion composite piezoelectric energy harvester can perform bending and torsion motion simultaneously, thereby helping to improve energy harvesting efficiency; and the energy harvester can be widely used for harvesting energy underwater or in the air.

Description

Technical field [0001] The invention relates to a piezoelectric energy harvester, in particular to a bending and torsion composite piezoelectric energy harvester with increased energy harvesting capacity, belonging to the technical field of vibration energy harvesting induced by water flow and air flow. Background technique [0002] Flow-induced vibration energy capture is a technology that uses the vortex excitation force generated by alternately falling off vortices when water or air flows through non-streamlined objects to excite energy capture oscillators to vibrate, thereby generating electrical energy. [0003] First of all, the flow-induced vibration energy capture in the prior art is mostly a single cantilever beam structure, that is, each response column drives only one piezoelectric cantilever beam to vibrate when vortex-induced vibration, and each energy capture vibrator has only one pressure The electric cantilever beam performs bending to generate electricity. For exa...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a bending-twisted composite piezoelectric energy harvester with increased energy harvesting capacity to solve the problem of low energy harvesting efficiency of the traditional single piezoelectric cantilever beam, and a series-connected piezoelectric energy harvester, Only bending movement, no influence relationship between the cantilever beams, the series connection structure occupies a large area, and the series connection state is easy to reduce the structural stiffness and make the structure unstable

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