CN113852295A - Multimode collision low-frequency piezoelectric energy harvester - Google Patents
Multimode collision low-frequency piezoelectric energy harvester Download PDFInfo
- Publication number
- CN113852295A CN113852295A CN202110999666.2A CN202110999666A CN113852295A CN 113852295 A CN113852295 A CN 113852295A CN 202110999666 A CN202110999666 A CN 202110999666A CN 113852295 A CN113852295 A CN 113852295A
- Authority
- CN
- China
- Prior art keywords
- substrate
- branch
- piezoelectric
- face
- energy harvester
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000758 substrate Substances 0.000 claims abstract description 58
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 229910000746 Structural steel Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 238000003306 harvesting Methods 0.000 abstract description 13
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000004377 microelectronic Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Images
Classifications
-
- 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
Landscapes
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The invention discloses a multi-mode collision low-frequency piezoelectric energy harvester, which relates to the technical field of energy harvesting, and utilizes a branch structure to increase the natural frequency in a low-frequency range, thereby generating more resonance frequency bands and outputting high voltage; each resonance frequency band is wider by using the collision between the branches and the main beam, and the energy capturing area is increased. The structure of the invention comprises a substrate, a piezoelectric plate, a branch beam and a mass block. The structure is provided with three branch structures, and the size and the distribution condition of each branch structure are the same.
Description
Technical Field
The invention relates to the technical field of energy harvesting, in particular to a multi-mode collision low-frequency piezoelectric energy harvester and an energy harvesting method thereof, wherein the multi-mode collision low-frequency piezoelectric energy harvester utilizes a cantilever beam free end additional branch structure and collision between branches and a main beam to increase the natural frequency order of a system in a low-frequency range, so that more and wider resonance frequency bands are generated in the low-frequency range to achieve the optimal energy harvesting effect.
Background
In recent years, the energy problem of microelectronic devices has been the focus of research by many researchers, and batteries have been the primary power source for these devices. However, the service life of the battery is short, the battery is treated by landfill, the soil environment is seriously polluted, the cost is high, and the battery is inconvenient. Therefore, harvesting and powering energy from the surrounding environment is a hot spot of current research.
Vibration is widely present in the environment and is a continuous energy source, so that resources can be saved by using the energy. The energy harvester converts vibration energy in the environment into electric energy through the strain of the piezoelectric patch, and provides a power supply for the microelectronic equipment. The energy harvesting modes of the energy harvester can be divided into three types: piezoelectric, electromagnetic, and electrostatic. The electromagnetic energy harvester relates to electromagnetic induction, when the magnetic flux passing through a closed lead changes, induced current is generated in the lead, so that electric energy is output, the structure is simple, and the output voltage is low; the working principle of the electrostatic energy harvester is that when a capacitor is vibrated, two polar plates move relatively, the capacitance value is changed, and the voltage at two ends of the capacitor is kept unchanged, so that the charge on the two polar plates of the capacitor is changed, the output of electric energy is realized, but the electrostatic energy harvester is complex in structural design and needs an external power supply. The piezoelectric energy harvester converts vibration energy into electric energy by utilizing the piezoelectric effect, and has the outstanding characteristics of simple structure, strong anti-interference capability, no pollution, easy processing, portability and the like.
The Chinese patent application (publication number CN110912455A) discloses a broadband vibration energy harvester, which comprises a low-frequency vibration structure, a high-frequency piezoelectric composite beam, a first moving magnet, a second moving magnet and a coil, wherein electric energy is respectively output according to electromagnetic induction between the first moving magnet and the coil and the piezoelectric effect of the second moving magnet touching the high-frequency piezoelectric composite beam. The structure is complex, the working frequency band in the low-frequency range is narrow, the electromagnetic induction and the piezoelectric effect are involved, and the cost is high.
Disclosure of Invention
The invention aims to solve the problem of poor energy harvesting effect of a piezoelectric energy harvester, and provides a piezoelectric energy harvester which utilizes a branch structure to increase the natural frequency in a low-frequency range, thereby generating more resonance frequency bands and outputting high voltage; provided are a piezoelectric energy harvester and an energy harvesting method thereof, wherein each resonance frequency band is wider by using collision between branches and a main beam.
The technical scheme adopted by the invention is as follows: a multi-mode collision low-frequency piezoelectric energy harvester comprises a substrate 1, a piezoelectric sheet 2, a branch beam 3 and a mass block 4; the cross section of the substrate 1 is rectangular, one end of the substrate is fixed with the outside to form a fixed end, and the other end of the substrate is a free end. Piezoelectric patches 2 are laid on the upper surface of the substrate 1, the width of each piezoelectric patch 2 is the same as that of the substrate, the length of each piezoelectric patch 2 is about one half of that of the substrate, and the left end faces of the piezoelectric patches are flush with the left end faces of the substrate. A large mass block is placed at the free end of a substrate 1, the width of the large mass block is the same as that of the substrate, the length of the large mass block is one twentieth of that of the substrate, the right end face of the large mass block is flush with the right end face of the substrate, three branch beams 3 are uniformly distributed on the upper surface of the large mass block, the size of each branch beam structure is the same as the distribution condition, the length of each branch beam 3 is one third of that of the substrate 1, the width of each branch beam is one fifth of that of the substrate 1, and the right end face of the large mass block is flush with the right end face of the substrate 1. The upper surface of the branch beam 3 is provided with the piezoelectric sheet 2, the length of the piezoelectric sheet 2 is half of that of the branch beam 3, the width of the piezoelectric sheet 2 is the same as that of the branch beam, and the right end face of the piezoelectric sheet 2 is flush with the right end face of the branch beam 3. The left end of the branch beam 3 is provided with a small mass block to reduce the natural frequency of the branch beam, the length of the mass block 4 is about one fourth of the length of the branch beam, the width of the mass block is equal to the width of the branch beam, and the left end surface of the mass block is flush with the left end surface of the branch beam.
The base plate 1 and the mass block 4 are both made of structural steel, the piezoelectric sheet 2 is made of common PVDF, and the branches 3 are both made of aluminum materials.
The energy harvesting method of the multi-mode collision piezoelectric energy harvester comprises the following specific steps:
the energy harvester is placed in a vibrating environment, the left side of the structure is fixed, when the vibration frequency of the external environment is consistent with that of the structure, the external environment and the structure resonate, the substrate vibrates to generate large deformation, and the piezoelectric sheet adhered to the substrate also generates deformation to capture electric energy. The vibration of the branch beam fixed on the substrate not only leads the piezoelectric plate on the upper surface of the branch beam to deform to capture energy, but also leads the branch beam to collide with the substrate, thereby greatly increasing the working bandwidth of the structure and improving the energy capturing efficiency. And the electric energy generated by the piezoelectric sheet is connected with an external circuit to output energy, thereby providing continuous energy for electronic equipment and the like. Since the structure has three branched beams, the natural frequency of the low frequency range is increased, so that the energy trapped is high. The fixed end has large strain, so that high electric energy can be generated by pasting the piezoelectric sheet on the fixed end. Because the distance between the branch beam and the substrate is short, the branch and the main beam collide during resonance, high output voltage can be continuously provided in a wider frequency band range, and the energy harvesting efficiency is increased.
Compared with the prior art, the invention has the following beneficial effects: 1. the three branch beams of the structure increase the natural frequency in a low-frequency range, generate more resonance frequency bands, have high adaptability to the environment and high energy harvesting efficiency; 2. the distance between the branch beam and the substrate is short, and the structure is internally collided, so that the energy harvester has a wider working frequency band; 3. the structure adopts the mass block for many times, reduces the natural frequency of the structure and is easy to resonate with the vibration frequency of the external environment; 4. the piezoelectric sheet is in a half-laying type according to the mechanical principle, the deformation at the fixed end is maximum, high voltage can be captured, and the cost is saved.
Drawings
FIG. 1 is a perspective view of a multi-mode collisional low frequency piezoelectric energy harvester of the invention;
FIG. 2 is a perspective view of a multi-mode collisional low frequency piezoelectric energy harvester local beam of the present invention;
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
Referring to the attached figure 1, the multi-mode collision low-frequency piezoelectric energy harvester comprises a substrate, a piezoelectric sheet, a branch beam and a mass block, wherein the cross section of the substrate is rectangular, one end of the substrate is fixed with the outside to form a fixed end, and the other end of the substrate is a free end. The piezoelectric piece is laid on the upper surface of the substrate, the width of the piezoelectric piece is the same as that of the substrate, the length of the piezoelectric piece is about one half of that of the substrate, and the left end face of the piezoelectric piece is flush with the left end face of the substrate. A large mass block is placed at the free end of the substrate, the width of the large mass block is the same as that of the substrate, the length of the large mass block is about one twentieth of that of the substrate, the right end face of the large mass block is flush with the right end face of the substrate, three branch structures are uniformly distributed on the upper surface of the mass block, the size of each branch structure is the same as the distribution condition, the length of each branch beam is about one third of that of the substrate, the width of each branch beam is one fifth of that of the substrate, and the right end face of the large mass block is flush with the right end face of the substrate. The piezoelectric piece is on the upper surface of the branch beam, the length of the piezoelectric piece is about half of the length of the branch beam, the width of the piezoelectric piece is the same as that of the branch beam, and the right end face of the piezoelectric piece is flush with the right end face of the branch beam. The left end of the branch beam is provided with a small mass block, the natural frequency of the branch beam is reduced, the length of the mass block is about one fourth of the length of the branch beam, the width of the mass block is equal to the width of the branch beam, and the left end face of the mass block is flush with the left end face of the branch beam.
The base plate and the mass block are both made of structural steel, the piezoelectric plate is made of common PVDF, and the branch beams are both made of aluminum materials.
The energy harvesting method of the multi-mode collision piezoelectric energy harvester comprises the following specific steps:
the energy harvester is placed in a vibrating environment, the left side of the structure is fixed, when the vibration frequency of the external environment is consistent with that of the structure, the external environment and the structure resonate, the substrate vibrates to generate large deformation, and the piezoelectric sheet adhered to the substrate also generates deformation to capture electric energy. The vibration of the branch beam fixed on the substrate not only leads the piezoelectric plate on the upper surface of the branch beam to deform to capture energy, but also leads the branch beam to collide with the substrate, thereby greatly increasing the working bandwidth of the structure and improving the energy capturing efficiency. And the electric energy generated by the piezoelectric sheet is connected with an external circuit to output energy, thereby providing continuous energy for electronic equipment and the like. Since the structure has three branched beams, the natural frequency of the low frequency range is increased, so that the energy trapped is high. The fixed end has large strain, so that high electric energy can be generated by pasting the piezoelectric sheet on the fixed end. Because the distance between the branch beam and the substrate is short, the branch and the main beam collide during resonance, high output voltage can be continuously provided in a wider frequency band range, and the energy harvesting efficiency is increased.
Claims (8)
1. The multimode collision low-frequency piezoelectric energy harvester is characterized by comprising a substrate, a piezoelectric sheet, a branch beam and a mass block; the cross section of the plate is rectangular, one end of the plate is fixed with the outside to form a fixed end, and the other end of the plate is a free end; the piezoelectric piece is laid on the upper surface of the substrate, the width of the piezoelectric piece is the same as that of the substrate, and the length of the piezoelectric piece is about one half of that of the substrate; a large mass block is arranged at the free end of the substrate, the width of the large mass block is the same as that of the substrate, the length of the large mass block is one twentieth of that of the substrate, the upper surface of the large mass block is provided with three branch structures, the size and the distribution condition of each branch structure are the same, the length of a branch beam of each branch structure is one third of that of the substrate, and the width of the branch beam is one fifth of that of the substrate; the piezoelectric sheet is arranged on the upper surface of the branch beam, the length of the piezoelectric sheet is about one half of that of the branch beam, and the width of the piezoelectric sheet is the same as that of the branch beam; the other end of the branch beam is provided with a mass block, the natural frequency of the branch beam is reduced, the length of the mass block is about one fourth of the length of the branch beam, and the width of the mass block is equal to the width of the branch beam.
2. The multi-modal crash low frequency piezoelectric energy harvester of claim 1 wherein the substrate and mass are both of structural steel, the piezoelectric patch is of PVDF and the branch beams are both of aluminum material.
3. The multi-modal collisional low frequency piezoelectric energy harvester of claim 1, wherein the piezoelectric patch laid on the upper surface of the substrate has a left end face flush with the left end face of the substrate.
4. The multi-modal collisional low frequency piezoelectric energy harvester of claim 1, wherein the right end face of the mass placed at the free end of the substrate is flush with the right end face of the substrate.
5. The multi-modal collisional low frequency piezoelectric energy harvester of claim 1, wherein the three branch structures are uniformly distributed on the large mass, and the right end face is flush with the right end face of the substrate.
6. The multi-modal crash low frequency piezoelectric energy harvester of claim 1, wherein the right end face of the piezoelectric patch on the branch beam is flush with the branch beam right end face.
7. The multi-modal crash low frequency piezoelectric energy harvester of claim 1, wherein the small mass left end face is flush with the branch beam right end face.
8. The multi-modal crash low frequency piezoelectric energy harvester of claim 1 wherein the substrate and mass are both of structural steel, the piezoelectric patch is of PVDF and the branch beams are both of aluminum material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110999666.2A CN113852295A (en) | 2021-08-29 | 2021-08-29 | Multimode collision low-frequency piezoelectric energy harvester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110999666.2A CN113852295A (en) | 2021-08-29 | 2021-08-29 | Multimode collision low-frequency piezoelectric energy harvester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113852295A true CN113852295A (en) | 2021-12-28 |
Family
ID=78976499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110999666.2A Pending CN113852295A (en) | 2021-08-29 | 2021-08-29 | Multimode collision low-frequency piezoelectric energy harvester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113852295A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204906229U (en) * | 2015-09-24 | 2015-12-23 | 金陵科技学院 | Arborescent multimode piezoelectricity power generation facility |
| CN105337531A (en) * | 2014-06-25 | 2016-02-17 | 华为技术有限公司 | Piezoelectric power generation device |
| KR101713798B1 (en) * | 2015-09-25 | 2017-03-08 | 광운대학교 산학협력단 | Wideband piezoelectric energy harvester |
-
2021
- 2021-08-29 CN CN202110999666.2A patent/CN113852295A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337531A (en) * | 2014-06-25 | 2016-02-17 | 华为技术有限公司 | Piezoelectric power generation device |
| CN204906229U (en) * | 2015-09-24 | 2015-12-23 | 金陵科技学院 | Arborescent multimode piezoelectricity power generation facility |
| KR101713798B1 (en) * | 2015-09-25 | 2017-03-08 | 광운대학교 산학협력단 | Wideband piezoelectric energy harvester |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110445417B (en) | Low-frequency broadband vibration energy harvesting device | |
| CN102790548B (en) | Bistable composite cantilever beam piezoelectric power generating device | |
| CN105226994A (en) | Multifrequency coupled vibrations energy capture device | |
| JP4663035B2 (en) | Vibration power generator, vibration power generation device, and communication device equipped with vibration power generation device | |
| CN104836478A (en) | Piezoelectric-electromagnetic composite low-frequency broadband energy harvester | |
| CN104022685B (en) | The frequency modulation array piezoelectric cantilever prisoner applying to piezoelectric harvester can method | |
| CN113315408B (en) | Highly integrated combined type vibration energy conversion module facing limited space | |
| CN106921310A (en) | A kind of electric field energy collection device | |
| CN106887973A (en) | A kind of parallel composite beam piezoelectricity electromagnetism prisoner based on magneticaction can device | |
| CN103414379A (en) | Piezoelectric energy collector based on linear resonator and nonlinear vibration exciter | |
| CN111130387A (en) | Asymmetric combined type broadband vibration energy collector | |
| CN102170247A (en) | Energy acquisition circuit of micro-power device driven by piezoelectricity-magnetoelectricity combined vibration | |
| CN105634331B (en) | A kind of magnetoelectricity piezoelectricity combines generator | |
| CN113852295A (en) | Multimode collision low-frequency piezoelectric energy harvester | |
| CN204795539U (en) | Power generation facility and applied this power generation facility's audio amplifier | |
| CN108809039A (en) | A kind of electromagnetic type T-type beam vibration energy collecting device based on rigid and fixible connecting structure | |
| CN113852294A (en) | Vibration-damping energy-harvesting dual-function metamaterial beam | |
| CN114448111A (en) | Piezoelectric wireless energy transmission device based on magnetic coupling | |
| Covaci et al. | Energy harvesting with piezoelectric materials for IoT–Review | |
| CN205407628U (en) | Magnetoelectric piezoelectricity combination generator | |
| Qi et al. | Research on optimization of piezoelectric composite cantilever beam structure | |
| RU2419952C1 (en) | Generation method of electric pulse in inductance load of explosive piezogenerator | |
| CN110601599A (en) | Broadband piezoelectric energy collector based on cantilever beam | |
| CN110768579A (en) | Bottle-shaped sound-electricity conversion power generation device | |
| CN100474648C (en) | Rosen piezoelectric transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |