Dynamic vibration absorber-based device for collecting piezoelectric vibration energy

A dynamic vibration absorber and energy harvesting technology, applied in piezoelectric/electrostrictive or magnetostrictive motors, electrical components, generators/motors, etc. Effect

Inactive Publication Date: 2010-06-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the time for a flapper to generate electricity is short, it needs continuous flapping to generate stable electric energy, but it is generally only suitable for low-frequency vibrations, especially the flapper needs to have a larger amplitude to vibrate. have limited its application

Method used

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  • Dynamic vibration absorber-based device for collecting piezoelectric vibration energy
  • Dynamic vibration absorber-based device for collecting piezoelectric vibration energy
  • Dynamic vibration absorber-based device for collecting piezoelectric vibration energy

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Such as figure 1 As shown, this embodiment includes: a vibrating element 1, a piezoelectric element 2, a cover plate 3, a dynamic vibration absorber 4 and an energy harvesting circuit 5, wherein: the vibrating element 1 is connected to the piezoelectric element 2, and the piezoelectric element 2 is fixed with a cover The plate 3 and the cover plate 3 are connected with the dynamic shock absorber 4 , and the energy harvesting circuit 5 is connected with the piezoelectric element 2 .

[0022] The dynamic vibration absorber 4 includes: a mass block 6 and an elastic element 7 , wherein: the elastic element 7 is connected to the cover plate 3 , and the mass block 6 is connected to the elastic element 7 .

[0023] The damping ratio of the elastic element 7 is less than 0.3.

[0024] Piezoelectric element 2 of the present embodiment adopts thickness stretching mold, and its piezoelectric constant is d 33 .

[0025] The energy harvesting circuit 5 is a full-bridge rectifier ...

Embodiment 2

[0030] Such as figure 2 As shown, the dynamic vibration absorber 4 of this embodiment is a superposition of two elastic elements 7 and a mass block 6, forming a double-layer dynamic vibration absorbing structure. The dynamic shock absorber 4 includes a first spring 11, a first mass block 12, a second spring 13 and a second mass block 14, wherein: the first spring 11 is connected to the cover plate 3, the first spring 11, the first mass block 12, The second spring 13 and the second mass block 14 are connected in sequence. That is, the elastic element 7 includes: a first spring 11 and a second spring 13 , and the mass block 6 includes: a first mass block 12 and a second mass block 14 .

[0031] Other implementation modes of this embodiment are the same as Embodiment 1.

[0032] In this embodiment, two springs, a mass block 6 and a vibrating element 1 are used to form a three-degree-of-freedom vibration system, which increases the number of formants and the width of the resona...

Embodiment 3

[0034] Such as image 3As shown, the elastic element 7 of this embodiment includes: a first bracket 15, a second bracket 16, a third spring 17 and a first lever 18, and the mass block 6 includes: a third mass block 19 and a fourth mass block 20, wherein : the first support 15 and the fourth mass block 20 are located at the two ends of the first lever 18 respectively, the second support 16 is connected to the first lever 18 and the cover plate 3 respectively, the first support 15 is connected to the third mass block 19, and the second support 16 is connected to the first lever 18 and the cover plate 3 respectively. The three masses 19 are connected to the third spring 17 , and the third spring 17 is connected to the cover plate 3 .

[0035] Other implementation modes of this embodiment are the same as Embodiment 1.

[0036] This structure is suitable for applications where weight is limited.

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Abstract

The invention relates to a dynamic vibration absorber-based device for collecting piezoelectric vibration energy, and belongs to the technical field of energy utilization. The device comprises a piezoelectric element, a cover plate, a dynamic vibration absorber and an energy collecting circuit, wherein the cover plate is fixed on the piezoelectric element and is connected with the dynamic vibration absorber; and the energy collecting circuit is connected with the piezoelectric element. The piezoelectric element can be arranged on the surface of an external vibrating element conveniently to collect the small-amplitude vibration energy without being embedded in the external vibrating element or large amplitude; and the working frequency of the piezoelectric element can be designed in a higher frequency domain so as to realize the easily-applied and efficient collection of the vibration energy.

Description

technical field [0001] The invention relates to a device in the technical field of energy utilization, in particular to a piezoelectric vibration energy harvesting device based on a dynamic vibration absorber. Background technique [0002] Micro-electro-mechanical systems such as wireless sensor networks, micro-electro-mechanical systems, and personal mobile devices have a common feature: the energy consumption is very low, ranging from a few μW to hundreds of mW, but the use time is required to be very long, and the key is due to the conditions of use. Restricting them generally cannot use power lines for energy supply. The current battery energy supply method has disadvantages such as large volume and short life. However, the use of solar energy, thermal gradient and other energy for power supply needs to be carried out in an environment with corresponding sunlight or thermal gradient. This limits their applications. [0003] There is abundant energy in the form of vibrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/18
Inventor 刘海利陈加浪王兆强陈大跃阳天亮徐天柱
Owner SHANGHAI JIAO TONG UNIV
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