CN115001313A - Low-frequency buckling type bistable piezoelectric energy harvesting device - Google Patents
Low-frequency buckling type bistable piezoelectric energy harvesting device Download PDFInfo
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- CN115001313A CN115001313A CN202210745361.3A CN202210745361A CN115001313A CN 115001313 A CN115001313 A CN 115001313A CN 202210745361 A CN202210745361 A CN 202210745361A CN 115001313 A CN115001313 A CN 115001313A
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- 238000003306 harvesting Methods 0.000 title claims abstract description 29
- 238000005452 bending Methods 0.000 claims abstract description 5
- 238000004146 energy storage Methods 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims description 13
- 229910001369 Brass Inorganic materials 0.000 claims description 4
- 239000010951 brass Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 235000000396 iron Nutrition 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010248 power generation Methods 0.000 abstract description 4
- 230000005284 excitation Effects 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Power Engineering (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention discloses a low-frequency buckling type bistable piezoelectric energy harvesting device which comprises a base, wherein a back plate is fixed on the base, and clamps are fixed at two ends of the back plate; a base beam is clamped on the clamp and is in a bending type, a mass block and a piezoelectric sheet are fixed on the base beam, and the piezoelectric sheet is positioned at the end part of the piezoelectric beam; the piezoelectric patch is communicated with the energy storage battery through a lead. The energy harvesting device can widen the frequency band by introducing the nonlinear structure, and realize wider working frequency band. Due to the introduction of a multi-stable structure, the collector generates non-linear vibration characteristics such as monostable, bistable and tristable states, and the purpose of improving the output performance of the energy collector can be achieved. The buckling bistable structure is formed by clamping the base beam and the mass block through the clamp, the buckling base beam is driven to bend through vibration of the mass block, the piezoelectric plate at the root of the base beam deforms, the positive piezoelectric effect is achieved, and deformation energy stored by the piezoelectric plate is converted into electric energy to achieve power generation. The energy capture efficiency is higher than other energy capture devices.
Description
Technical Field
The invention belongs to the technical field of energy capture, and relates to a low-frequency buckling type bistable piezoelectric energy harvesting device.
Background
In recent years, energy capture has become one of the leading-edge hot spot technologies of common interest to both academia and industry. The vibration energy capture is an autonomous power supply technology of low-power-consumption electronic equipment which is widely researched at present, and provides a solution for the problem of durable and reliable power supply of the future wireless sensor network technology and the Internet of things technology. The traditional sensing system has the problems of limited battery life, difficult replacement and higher cost, and the used battery has the problems of environmental pollution and the like; the traditional technologies such as hydraulic power generation and wind power generation are mainly suitable for high-power occasions, are high in manufacturing cost and large in size, and are not suitable for power supply of low-power-consumption electronic equipment.
The basic principle of vibration energy capture is to collect and utilize energy contained in displacement or deformation of an object caused by external motion, and convert the energy into electric energy. The capture mechanism is mainly divided into three categories: piezoelectric, electrostatic, and electromagnetic induction. The piezoelectric energy capture is to convert the deformation energy of the piezoelectric material into electric energy by utilizing the positive piezoelectric effect of the piezoelectric material; the basic principle of electrostatic vibration energy capture is to generate electrical energy by a change in capacitance caused by environmental vibrations; the basic principle of electromagnetic vibration energy capture is to use the faraday's electromagnetic induction theorem, i.e., the electric field generated when the magnetic flux changes.
Researchers have conducted extensive innovations and experiments in order to improve the efficiency of vibration energy capture. The traditional linear vibration energy capture can only carry out energy capture in a resonance peak area, and the frequency band is narrow. Most natural environment vibrations are random, and how to capture energy in a wider operating frequency band becomes one of the research hotspots.
Disclosure of Invention
The invention aims to provide a low-frequency buckling type bistable piezoelectric energy harvesting device, which can widen a frequency band by introducing a nonlinear structure, can realize a wider working frequency band, and has higher and stable energy harvesting efficiency.
The technical scheme adopted by the invention is that the low-frequency buckling type bistable piezoelectric energy harvesting device comprises a base, wherein a back plate is fixed on the base, and two ends of the back plate are fixed with clamps; a base beam is clamped on the clamp and is in a buckling mode, a mass block and a piezoelectric sheet are fixed on the base beam, and the piezoelectric sheet is located at the end of the base beam; the piezoelectric patch is communicated with the energy storage battery through a lead.
The invention is also characterized in that:
the base is of a structure with a section of an arc surface, and the top end of the base is a plane.
Threaded through holes are formed in the clamp and the back plate, and the clamp is fixed on the back plate through the matching of the bolt and the nut.
The clamp is L-shaped angle iron, two clamps are fixed at each end of the back plate, and the base bottom beam is fixed under the action of the two clamps.
The base beam is of a narrow plate structure.
The base beam is made of brass.
The mass block is fixed in the middle of the base beam.
The piezoelectric sheet is fixed at the end part of the substrate beam close to the base.
The piezoelectric piece is a PZT-5H piezoelectric ceramic piece.
The piezoelectric sheet has the same width as the base beam.
The energy harvesting device can widen the frequency band by introducing the nonlinear structure, and realize wider working frequency band. Due to the introduction of a multi-stable structure, the collector generates non-linear vibration characteristics such as monostable, bistable and tristable states, and the purpose of improving the output performance of the energy collector can be achieved. The buckling bistable structure is formed by clamping the base beam and the mass block through the clamp, the buckling base beam is driven to bend through vibration of the mass block, the piezoelectric plate at the root of the base beam deforms, the positive piezoelectric effect is achieved, and deformation energy stored by the piezoelectric plate is converted into electric energy to achieve power generation. The energy capture efficiency of the present invention is higher compared to other energy capture devices.
Drawings
Fig. 1 is a schematic structural diagram of a low-frequency buckling bistable piezoelectric energy harvesting device according to the present invention;
fig. 2 is a schematic front view of the low-frequency buckling bistable piezoelectric energy harvesting device of the present invention.
In the figure, 1, a bolt, 2, a nut, 3, a clamp, 4, a threaded through hole, 5, a base beam, 6, a mass block, 7, a piezoelectric sheet, 8, a back plate, 9, a base, 10, a lead and 11, an energy storage battery.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
According to the low-frequency buckling type bistable piezoelectric energy harvesting device, as shown in fig. 1 and 2, a clamp 3 is fixed on a back plate 8 through the matching of a bolt 1 and a nut 2; the base beam 5 is assembled on one side of the plane of the clamp 3 and is in a buckling shape; a proper mass block 6 is fixed in the middle of the base beam 5, so that the buckling beam is easier to vibrate; the root of the base beam 5 close to one end of the back plate 8 is adhered with a piezoelectric sheet 7 to form a bending piezoelectric beam.
The integral frame comprises two parts, one part is a circular arc-shaped base 9 which is connected with a rotary excitation source; the other part is a back plate 8 which is provided with screw holes with different intervals for fixing the common clamp 3.
The piezoelectric beam is composed of a base beam 5 and a piezoelectric sheet 7. Two ends of the base beam 5 are punched, two same clamps 3 are respectively used for fixing through the holes punched by the bolts 1, and the root part of the base beam 5 close to one side of the clamps 3 is pasted by a piezoelectric sheet 7. When the rotary excitation source is excited, the buckling beams fixed at the two ends vibrate to generate bending deformation, and deformation energy is converted into electric energy through the direct piezoelectric effect. The clamp 3 is assembled in screw holes at different positions of the back plate 8, so that different degrees of buckling are realized.
To facilitate the mounting of the piezoelectric patch 7 and to improve the service life, the width of the piezoelectric patch 7 is the same as the width of the substrate beam 5.
The surface of the base 9, which is in contact with the rotary excitation source, namely the base part is provided with an arc surface, and the radius of the arc surface is the same as that of the arc surface outside the rotary excitation source, so that the energy harvesting device can be easily installed and matched on the rotary excitation source. The shape of the base 9 is not exclusive and can be adapted to the actual size and shape of the rotary excitation source.
The clamp 3 is fixedly connected with two ends of the base beam 5 through bolts 1, and the end face of the clamp 3 is connected with the back plate 8. The mass block 6 is fixed in the middle of the base beam 5, and the integral structure of the mass block 6 and the base beam 5 is realized.
The base beam 5 is made of brass, the piezoelectric sheet 7 is made of a PZT-5H piezoelectric ceramic sheet, the brass has higher elasticity, the energy capture effect is improved, and the PZT-5H piezoelectric ceramic is an excellent insulator, so that the energy loss can be reduced.
The principle of the invention is as follows: when the rotation excitation source works, a rotation environment is equivalently provided for the bistable piezoelectric energy harvesting device, namely, a periodic external excitation is provided, under the excitation action, the mass block 6 in the middle of the substrate beam 5 can vibrate to drive the bending substrate beam 5 to vibrate, the piezoelectric plate 7 at the root of the substrate beam 5 can deform, the deformation energy of the piezoelectric beam is converted into electric energy by utilizing the positive piezoelectric effect, and finally the energy is stored through the energy storage battery 11 connected with the lead 10. Meanwhile, the buckling with different degrees can be formed by adjusting the position of the clamp 3 on the back plate 8, so that the clamp is suitable for different working environments.
In operation, the device is mounted on the hub of a wheel or other source of rotational excitation. The specific mounting and connection of the various components of the device (described in the direction from the excitation source) is as follows: base 9 and rotatory excitation source fixed surface are connected, glue with the brute force with base 9 and 8 adhesions of backplate, anchor clamps 3 have four, all pass screw thread through-hole 4 through bolt 1 and fix with the cooperation of nut 2, and 5 roots of basement roof beam are glued fixed piezoelectric patch 7 with the brute force, and 5 middle parts of basement roof beam are glued fixed quality piece 6 with the brute force, and basement roof beam 5 forms the bucking through bolt 1 and nut 2 cooperation fixed to anchor clamps 3.
As shown in fig. 1, the device is mounted on a rotary excitation source via a base 9; when the rotary excitation source works, periodic external excitation is generated, and the excitation acts on the low-frequency buckling type bistable piezoelectric energy harvesting device, so that the mass block 6 is driven to vibrate, and the substrate beam 5 is driven to vibrate. As shown in fig. 2, when the substrate beam 5 undergoes buckling vibration, the piezoelectric sheet 7 attached to the substrate beam 5 generates a positive piezoelectric effect, converts the vibration energy into electric energy, and finally stores the electric energy.
The invention provides a low-frequency buckling type bistable piezoelectric energy harvesting device, which has the advantages that when the buckling type piezoelectric energy harvesting device vibrates due to external excitation, the vibration of a mass block 6 presents a bistable characteristic due to nonlinear force, the energy harvesting efficiency can be effectively improved, and the working frequency band of an energy harvester can be widened. The bistable structure can be formed by nonlinear force, the energy capture efficiency is high, the working frequency band is wide, and the traditional chemical battery can be replaced to supply power to microelectronic equipment with low power consumption. The invention utilizes the design method of the piezoelectric beam structure and the buckling structure, not only has the characteristics of environmental protection and simple structure, but also can install one or more structures on the rotary excitation source according to the actual working condition and the requirement; the structure introduces nonlinear vibration into energy harvesting, and the whole system energy conversion efficiency of the structure is greatly improved.
Compared with the energy capture structure based on the rotating environment, the device provided by the invention is a bistable structure, not only utilizes the nonlinear characteristic, but also is safer in practical application, has high and stable energy capture efficiency in the low-frequency vibration environment, and provides a new idea and solution for the autonomous power supply problem of the micro wireless electronic equipment.
Claims (10)
1. The low-frequency buckling type bistable piezoelectric energy harvesting device is characterized by comprising a base (9), wherein a backboard (8) is fixed on the base (9), and two ends of the backboard (8) are fixed with clamps (3); a base beam (5) is clamped on the clamp (3), the base beam (5) is in a bending type, a mass block (6) and a piezoelectric sheet (7) are fixed on the base beam (5), and the piezoelectric sheet (7) is positioned at the end part of the base beam (5); the piezoelectric patch (7) is communicated with an energy storage battery (11) through a lead (10).
2. The low-frequency buckling bistable piezoelectric energy harvesting device according to claim 1, wherein the base (9) is a structure with a circular arc-shaped cross section, and the top end of the base (9) is a plane.
3. The low-frequency buckling type bistable piezoelectric energy harvesting device according to claim 1, wherein threaded through holes are formed in the clamp (3) and the backboard (8), and the clamp (3) is fixed on the backboard (8) through matching of a bolt (1) and a nut (2).
4. The low frequency buckling bistable piezoelectric energy harvesting device according to claim 1, wherein the clamps (3) are L-shaped angle irons, two clamps (3) are fixed at each end of the back plate (8), and the substrate beam (5) is fixed through the action of the two clamps (3).
5. The low frequency buckling bistable piezoelectric energy harvesting device of claim 1, wherein the substrate beam (5) is a narrow plate structure.
6. The low frequency buckling bistable piezoelectric energy harvesting device according to claim 1 or 5, wherein the substrate beam (5) is made of brass.
7. The low frequency buckling bistable piezoelectric energy harvesting device of claim 1, wherein the mass (6) is fixed to the base beam (5) at an intermediate position.
8. The low frequency buckling bistable piezoelectric energy harvesting device of claim 1, wherein the piezoelectric sheet (7) is fixed to the end of the substrate beam (5) near the base (9).
9. The low frequency buckling bistable piezoelectric energy harvesting device of claim 1, wherein the piezoelectric patch (7) is a PZT-5H piezoceramic patch.
10. The low frequency buckling bistable piezoelectric energy harvesting device of claim 1, wherein the width of the piezoelectric sheet (7) is the same as the width of the substrate beam (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210745361.3A CN115001313A (en) | 2022-06-28 | 2022-06-28 | Low-frequency buckling type bistable piezoelectric energy harvesting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210745361.3A CN115001313A (en) | 2022-06-28 | 2022-06-28 | Low-frequency buckling type bistable piezoelectric energy harvesting device |
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| Publication Number | Publication Date |
|---|---|
| CN115001313A true CN115001313A (en) | 2022-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210745361.3A Pending CN115001313A (en) | 2022-06-28 | 2022-06-28 | Low-frequency buckling type bistable piezoelectric energy harvesting device |
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| Country | Link |
|---|---|
| CN (1) | CN115001313A (en) |
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2022
- 2022-06-28 CN CN202210745361.3A patent/CN115001313A/en active Pending
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