阅读说明：本技术 一种不对称悬臂梁式压电宽频振动能量收集装置 (Asymmetric cantilever beam type piezoelectric broadband vibration energy collecting device ) 是由 邹爱成 沈星 王群英 刘忠 宋小辉 韩兴国 于 2020-06-03 设计创作，主要内容包括：本发明公开了一种不对称悬臂梁式压电宽频振动能量收集装置,包括第一质量块,及在第一质量块上间隔设置的第一悬臂梁和第二悬臂梁,第一悬臂梁的另一端设有基座,第二悬臂梁的另一端设有第二质量块,第一悬臂梁上设有一组间隔设置的第一压电片,第二悬臂梁上设有一组间隔设置的第二压电片,第一悬臂梁的长度大于第二悬臂梁的长度。这种收集装置能有效拓宽压电结构对环境振动响应的频带,能有效提高同等可比条件下压电结构对环境振动的能量收集效率。(The invention discloses an asymmetric cantilever beam type piezoelectric broadband vibration energy collecting device which comprises a first mass block, a first cantilever beam and a second cantilever beam, wherein the first cantilever beam and the second cantilever beam are arranged on the first mass block at intervals, a base is arranged at the other end of the first cantilever beam, a second mass block is arranged at the other end of the second cantilever beam, a group of first piezoelectric patches are arranged on the first cantilever beam at intervals, a group of second piezoelectric patches are arranged on the second cantilever beam at intervals, and the length of the first cantilever beam is greater than that of the second cantilever beam. The collecting device can effectively widen the frequency band of the piezoelectric structure responding to the environmental vibration and effectively improve the energy collecting efficiency of the piezoelectric structure to the environmental vibration under the same comparable condition.)

1. The utility model provides an asymmetric cantilever beam formula piezoelectricity wide band vibration energy collection device which characterized in that, includes first quality piece, and first cantilever beam and the second cantilever beam that sets up at the interval on first quality piece, the other end of first cantilever beam is equipped with the base, the other end of second cantilever beam is equipped with the second quality piece, is equipped with the first piezoelectric patches that a set of interval set up on the first cantilever beam, is equipped with the second piezoelectric patches that a set of interval set up on the second cantilever beam, the length of first cantilever beam is greater than the length of second cantilever beam.

2. The asymmetric-cantilever piezoelectric broadband vibration energy harvesting device according to claim 1, wherein the material of the first cantilever beam and the second cantilever beam is a conductive metal material.

3. The asymmetric-cantilever piezoelectric broadband vibration energy harvesting device according to claim 1, wherein the gap between the first cantilever beam and the second cantilever beam is 5 mm.

4. The asymmetric cantilever piezoelectric broadband vibration energy harvesting device of claim 1 wherein the density of the first and second cantilever beams is 2.7x10³kg/m³The Young's modulus was 60 GPa.

5. The device of claim 1 wherein the first mass has a weight of 5.06g and the second mass has a weight of 2.89 g.

6. The device of claim 1 wherein the first and second piezoelectric patches have a density of 7.5x10³kg/m³The Young's modulus was 66 GPa.

Technical Field

The invention relates to a vibration energy collecting technology, in particular to an asymmetric cantilever beam type piezoelectric broadband vibration energy collecting device.

Background

A multi-cantilever beam type broadband energy harvesting structure is designed in the summer, and as shown in fig. 3, a plurality of cantilever beam piezoelectric vibrators form a multi-piezoelectric vibrator vibration array, so that the resonance frequency band of the piezoelectric vibrator is widened, and the piezoelectric vibrator can generate resonance or approximate resonance within a frequency range. By properly designing the length of the cantilever beam and the size of the mass block, the cantilever beam can realize resonance at a plurality of similar frequency points, and further can realize energy collection in a wide frequency band.

The Liu Shao steel designs the structure of the two-degree-of-freedom piecewise linear piezoelectric vibration energy collecting device, and as shown in figure 4, the device consists of a two-degree-of-freedom main cantilever beam and a single-degree-of-freedom driven cantilever beam. The piezoelectric plate as the energy conversion component is attached to the first section of the two-freedom-degree main beam, and the mass blocks positioned in the middle and at the top of the main beam are used as vibration masses. And a distance gap is reserved between the mass block and the driven beam, and when external excitation at the base is large enough, the mass block collides with the driven beam because the displacement of the mass block in each vibration period is larger than the gap distance. The structure can generate response frequencies of two modes, but has the problem of relatively complicated structure.

The defects of the two structures are that the structure is complex, and each beam is only provided with one whole piezoelectric sheet, so that the energy collection efficiency is low.

Disclosure of Invention

The invention aims to provide an asymmetric cantilever beam type piezoelectric broadband vibration energy collecting device aiming at the defects in the prior art. The collecting device can effectively widen the frequency band of the piezoelectric structure responding to the environmental vibration and effectively improve the energy collecting efficiency of the piezoelectric structure to the environmental vibration under the same comparable condition.

The technical scheme for realizing the purpose of the invention is as follows:

the utility model provides an asymmetric cantilever beam formula piezoelectricity wide band vibration energy collection device, includes first quality piece, and first cantilever beam and the second cantilever beam that the interval set up on first quality piece, the other end of first cantilever beam is equipped with the base, the other end of second cantilever beam is equipped with the second quality piece, is equipped with the first piezoelectric patches that a set of interval set up on the first cantilever beam, is equipped with the second piezoelectric patches that a set of interval set up on the second cantilever beam, the length of first cantilever beam is greater than the length of second cantilever beam.

The first cantilever beam and the second cantilever beam are made of conductive metal materials.

And the gap between the first cantilever beam and the second cantilever beam is 5 mm.

The density of the first cantilever beam and the second cantilever beam is 2.7x10³kg/m³The Young's modulus was 60 GPa.

The weight of the first mass block is 5.06g, and the weight of the second mass block is 2.89 g.

The density of the first piezoelectric sheet and the second piezoelectric sheet is 7.5x10³kg/m³The Young's modulus was 66 GPa.

The number of the first piezoelectric sheets is 2, and the gap between the 2 first piezoelectric sheets is 1 mm.

The number of the second piezoelectric sheets is 2, and the gap between the 2 second piezoelectric sheets is 1 mm.

The collecting device effectively widens the frequency band of the piezoelectric structure responding to the environmental vibration and effectively improves the energy collecting efficiency of the piezoelectric structure responding to the environmental vibration under the same comparable condition.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment;

FIG. 2 is a side view of the embodiment;

FIG. 3 is a schematic diagram of a piezoelectric energy harvesting structure of a Sieve design in the prior art;

FIG. 4 is a schematic view of a prior art collection device designed for a Liu Shao steel;

FIG. 5 is a frequency response graph of an embodiment;

fig. 6 is a schematic diagram of the variation of the output electric power with the excitation frequency of the embodiment.

In fig. 1, 1 is a first cantilever beam 2, a second cantilever beam 3, a first mass block 4, a base 5, a second mass block 6, a first piezoelectric sheet 7 and a second piezoelectric sheet.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific examples, but the invention is not limited thereto.