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Fractal structure-based compact broadband vibration transducer and encapsulation method thereof

A technology of vibration transducer and fractal structure, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, electrical components, etc., can solve the problems of narrow response bandwidth, narrow frequency band, and energy conversion density Low-level problems, to achieve the effect of multiple vibration response frequencies, broadening the resonance frequency band, and making full use of it

Inactive Publication Date: 2015-12-09
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, provide a small broadband vibration transducer based on a fractal structure and its packaging method, and solve the problem of narrow response bandwidth and frequency band of existing vibration transducers. The problem of narrow, low energy conversion density

Method used

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  • Fractal structure-based compact broadband vibration transducer and encapsulation method thereof
  • Fractal structure-based compact broadband vibration transducer and encapsulation method thereof
  • Fractal structure-based compact broadband vibration transducer and encapsulation method thereof

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Embodiment 1

[0031] The prototype of the fractal structure in this embodiment is the Sierpinski triangle fractal structure, which has the characteristic of self-similarity. Through the irregularity of the triangular fractal structure, multiple different frequency nodes can be obtained, thereby broadening the response frequency bandwidth of the vibration transducer frequency band, and the fractal structure has self-similarity, and also ensures the size of the collected energy density . Such as figure 1 As shown, the fractal structure designed by the present invention has obvious similarities in the three transducer units, which can ensure that the structure has at least three main resonance frequencies, thereby broadening the frequency spectrum.

[0032] The broadband vibration transducer of the present embodiment, as figure 1 As shown, the structure adopts a frame body 1 and a layer body 6, and the layer body 6 has four main beams 2 and three transducing units as elements. One end of ea...

Embodiment 2

[0040] The broadband vibration transducer of this embodiment adopts a frame body 1 and a layer body 6. There are four main beams 2 in the layer body of this structure. The difference from Embodiment 1 is that this structure has three The fractal structure of the transduction unit is effectively filled, and three transduction units are used as elements for dense distribution, such as Figure 5 As shown, the three transducing units include figure 2 The first transducer unit shown, image 3 The second transducer unit shown, Figure 4 The third transducing unit is shown, and each transducing unit selects the Sierpinski triangular fractal structure respectively, and performs cantilever beamization on its internal unit, so that its internal structure forms a cantilever beam on each different transducing unit, The rest of the parts can be regarded as mass blocks on the cantilever beam. The principle of the cantilever beam is the same as that of the first embodiment.

[0041] The...

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Abstract

The invention discloses a fractal structure-based compact broadband vibration transducer and an encapsulation method thereof. The transducer comprises a layer body composed of a fractal structure and a frame body with an electrode arranged therein; the fractal structure includes a plurality of main beams and at least three transducing units which are similar in shape and have different main resonance frequencies; at least one end of each main beam is fixedly connected with the frame body; each transducing unit has a centroid and a fixed end which is fixedly connected with a corresponding main beam or the frame body; a beam on each transducing unit, which extends from the fixed end to the centroid, is adopted as a cantilever beam, and the other beams on each transducing unit are adopted as mass blocks; when environment vibration occurs, the mass blocks and the cantilever beams of the transducing units receive the vibration according to the frequency of the environment vibration, and the transducing units obtain stress borne by the transducing units according to the received vibration and convert the stress into electric energy; and the frame body leads out the electric energy through the electrode. With the fractal structure-based compact broadband vibration transducer adopted, frequency band response width can be broadened, and high conversion energy can be obtained, and unit-area energy acquisition density can be increased.

Description

technical field [0001] The invention relates to a broadband vibration transducer, in particular to a small broadband vibration transducer based on a fractal structure and a packaging method thereof, belonging to the technical field of vibration transducers. Background technique [0002] In recent years, with the increasingly widespread application of wireless networks, MEMS and portable electronic devices, the disadvantages of using chemical batteries have attracted increasing attention, such as regular replacement, large mass, and pollution. Moreover, in some special occasions, it is difficult to replace batteries regularly, so people pay more attention to the use of green and sustainable energy to replace traditional batteries. Among them, energy harvesting technology has attracted the most attention. [0003] Energy harvesting technology collects energy spontaneously from the environment through the transducer, and its essence is to use various physical or chemical effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/18
CPCH02N2/188H02N2/22
Inventor 梁忠诚王燕刘瑞华柳正球丁若尧
Owner NANJING UNIV OF POSTS & TELECOMM
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