Multi-section bifurcated dense-frequency piezoelectric plate energy capturing device based on torsional vibration

Abstract

The invention discloses a multi-section bifurcated dense-frequency piezoelectric plate energy capturing device based on torsional vibration, which belongs to the field of piezoelectric energy collection. The device comprises a clamping base, piezoelectric plates and a cantilever main plate, wherein one end of the cantilever main plate is fixed to the side wall of the clamping base to form a cantilever framework, and piezoelectric plates are arranged on the upper surface and the lower surface of the root; a bifurcated plate is arranged at the other end of the cantilever main plate; and the bifurcated plate comprises two or more bifurcated plate sub-plates. By adjusting the lengths and the bifurcating angles of the bifurcated plates, when the lengths and the bifurcating angles of the two sections of bifurcated plates are different, the piezoelectric plate structure has an asymmetric characteristic, so that the piezoelectric plate structure has more response peaks under the asymmetric condition compared with a symmetric structure; and therefore, the piezoelectric plate adhered to the cantilever main plate has a wider piezoelectric response frequency band under the condition, and a higher piezoelectric energy capturing effect under the frequency is achieved.

Description

technical field [0001] The invention belongs to the field of piezoelectric energy collection, and in particular relates to a multi-segment bifurcated dense-frequency piezoelectric plate energy capture device based on bending torsional vibration. Background technique [0002] At present, the piezoelectric energy capture structure converts the mechanical energy of the structure into electrical energy through the resonance characteristics of the piezoelectric sheet at the structural modal frequency to achieve energy capture. However, the conventional cantilever piezoelectric energy harvesting structure has a narrow energy harvesting frequency band and low energy harvesting efficiency. There are also options to add a mass block to the free end of the cantilever piezoelectric energy capture structure to reduce the response frequency and use nonlinear methods to broaden the energy capture frequency band, but the effect cannot meet the higher requirements of future energy capture. ...

AI Technical Summary

Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a multi-segment bifurcated dense-frequency piezoelectric plate energy harvesting device based on bending and torsional vibration, which can broaden the response frequency band of energy harvesting from the perspective of the structural mode and solve the problem of piezoelectric The problem of narrow response frequency band, weak adaptability of energy capture device and maximum energy capture efficiency in one direction

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