CN114039505A - Ultra-wideband nonlinear piezoelectric energy collecting device utilizing compact vibrator array - Google Patents
Ultra-wideband nonlinear piezoelectric energy collecting device utilizing compact vibrator array Download PDFInfo
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- CN114039505A CN114039505A CN202111288771.1A CN202111288771A CN114039505A CN 114039505 A CN114039505 A CN 114039505A CN 202111288771 A CN202111288771 A CN 202111288771A CN 114039505 A CN114039505 A CN 114039505A
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- 238000003306 harvesting Methods 0.000 claims abstract description 36
- 239000000956 alloy Substances 0.000 claims description 9
- 229910000838 Al alloy Inorganic materials 0.000 claims description 6
- 239000002033 PVDF binder Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 230000005489 elastic deformation Effects 0.000 claims description 3
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 3
- 230000005284 excitation Effects 0.000 abstract description 12
- 230000004044 response Effects 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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- 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
- H02N2/188—Vibration harvesters adapted for resonant operation
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Abstract
The invention provides an ultra-wideband nonlinear piezoelectric energy collecting device utilizing a compact vibrator array, which comprises a compact vibrator array component, a vibrator array bracket, a nonlinear energy harvesting component and a fixed bracket component, wherein the compact vibrator array component is arranged on the vibrator array bracket; the compact oscillator array assembly is arranged on the oscillator array support, the oscillator array support is arranged at the top end of the fixed support assembly, and the oscillator array support is arranged in the middle of the fixed support assembly; the end part of the compact oscillator array component can move along the vertical direction, and the compact oscillator array component can drive the nonlinear energy harvesting component to vibrate through magnetic force, so that electric energy is output. According to the piezoelectric energy harvesting device, a plurality of spring oscillator units with different resonant frequency ranges are utilized to realize large-amplitude response under different external excitation frequencies, and the practicability and the applicability of the piezoelectric energy harvesting device are remarkably improved.
Description
Technical Field
The invention relates to the field of vibration energy collection, in particular to an ultra-wideband nonlinear piezoelectric energy collection device utilizing a compact vibrator array, and particularly relates to a wideband nonlinear piezoelectric energy collection device.
Background
The utilization of vibration energy harvesting devices to power micro devices has received increasing attention from many scientific studies and engineering practices. The vibration energy harvesting device supplies electric energy to low-energy-consumption equipment such as wearable equipment and wireless sensor nodes by collecting ubiquitous and continuous vibration energy in the environment and converting the vibration energy into usable electric energy. Compared with traditional power supplies such as a chemical primary battery and the like, the working life of the vibration energy collecting device is related to whether the structure of the device is damaged or not, and is far longer than the service life of the chemical primary battery. Compared with a chemical primary battery, the energy collecting device does not need to be frequently replaced and does not produce waste gas battery pollution, and is an environment-friendly energy collecting device. The piezoelectric energy collecting device is one of the mainstream vibration energy harvesting devices at present, and has the advantages of high conversion efficiency, simple structure, low cost and the like.
The most common piezoelectric energy collecting device is a linear vibration collecting device, and the working principle of the device is mainly based on that a cantilever beam and other linear vibrator structures are in a resonance state and can generate larger amplitude, so that the stress change range in a piezoelectric element near the fixed end of the device is enlarged, and efficient vibration energy collection and conversion are realized. For example, patent CN105932906B discloses a piezoelectric energy harvesting device and a method for manufacturing the same. The piezoelectric energy collecting device utilizes a cantilever beam structure formed by a vibrating block and a piezoelectric vibrator together, and obtains the maximum output power by utilizing the condition of a vibration source and the performance of a piezoelectric material through a linear cantilever beam structure. However, the resonance bandwidth of such a linear vibrator is extremely narrow, and when the excitation frequency range is not near the resonance frequency, the operating efficiency of the piezoelectric energy harvesting device based on the linear structure is greatly limited. Considering that the vibration frequency distribution range in the environment is wider, the working bandwidth of the piezoelectric energy collecting device is widened, and the practicability and the working efficiency of the piezoelectric energy collecting device can be obviously improved. The nonlinear permanent magnetic force is utilized to realize the design of the nonlinear piezoelectric energy collecting device, so that the working bandwidth of the energy collecting device can be remarkably widened, and the working efficiency of the piezoelectric energy collecting device is improved. For example, patent CN111404419A discloses a dual-magnet multistable piezoelectric cantilever beam energy harvester. The invention utilizes the annular and rectangular magnets to realize the three-stable state or four-stable state of the system, broadens the bandwidth of the vibration energy collecting device and improves the volume energy collecting density of the collector. Although the nonlinear energy collecting device effectively widens the working bandwidth of the energy collecting device, the energy conversion efficiency is improved by increasing the amplitude of the oscillator. But the widening range of the working bandwidth is limited, and the wider vibration frequency band is still restricted by the excitation condition compared with the environment. In order to further widen the working frequency band of the piezoelectric energy collecting device, the design of the cantilever beam array can realize the superposition of resonance frequency bands in different ranges in a plurality of groups of structures, thereby realizing the wide-frequency energy collection. For example, patent CN110601599A discloses a broadband piezoelectric energy collector based on cantilever beams, the energy collector includes multiple groups of cantilever beams to form a cantilever beam array, and each group of cantilever beams with different lengths is used to realize stacking at different resonant frequencies, so as to realize effective conversion and output of vibration energy at multiple resonant frequencies. However, the cantilever array type broadband piezoelectric energy collecting device is difficult to realize compact structural design due to arrangement of the cantilever beams, so that the volume energy collecting density of the collector is extremely low, integration of the device is not facilitated, and the practicability of the energy collecting device is restricted.
Therefore, the existing piezoelectric energy collecting device has the defects of not compact structure, limited frequency broadening range of the nonlinear piezoelectric energy collecting device and the like.
Patent document CN 108054952B provides a piezoelectric-electromagnetic composite vibration energy harvester and a method for manufacturing the same, the energy harvester includes a substrate and a back plate stacked on each other; the substrate is etched to form a cantilever beam structure, wherein a groove is formed in the lower surface of the substrate, the cantilever beam structure is arranged above the groove, the groove and the back plate form a cavity, and a permanent magnet is arranged in the cavity; the upper surface of the cantilever beam structure is provided with a piezoelectric layer, a first inductance coil layer is arranged in the peripheral area of the upper surface of the substrate except the cantilever beam structure, and the piezoelectric layer is insulated from the first inductance coil layer; and a second inductance coil layer is arranged on the lower surface of the back plate. It still does not overcome the problem of narrow resonance bandwidth.
Disclosure of Invention
In view of the shortcomings of the prior art, it is an object of the present invention to provide an ultra-wideband nonlinear piezoelectric energy harvesting device that utilizes a compact array of vibrators.
The invention provides an ultra-wideband nonlinear piezoelectric energy collecting device utilizing a compact vibrator array, which comprises a compact vibrator array component, a vibrator array bracket, a nonlinear energy harvesting component and a fixed bracket component, wherein the compact vibrator array component is arranged on the fixed bracket component;
the compact oscillator array assembly is arranged on the oscillator array support, the oscillator array support is arranged at the top end of the fixed support assembly, and the oscillator array support is arranged in the middle of the fixed support assembly;
the end part of the compact oscillator array component can move along the vertical direction, and the compact oscillator array component can drive the nonlinear energy harvesting component to vibrate through magnetic force, so that electric energy is output.
Preferably, the fixed support assembly comprises a stand column and a base, the stand column is vertically installed on the base, the oscillator array support is installed at the top end of the stand column, and the nonlinear energy harvesting assembly is installed in the middle of the stand column;
the bottom of the base is provided with an installation surface, and the installation surface is connected with an external part.
Preferably, the compact vibrator array assembly comprises a plurality of spring vibrator units, each spring vibrator unit comprises a spring and a first permanent magnet, one end of each spring is mounted on the vibrator array support, and the other end of each spring is connected with the first permanent magnet; the spring stiffness of the spring vibrator units is not completely the same, and the spring vibrator units are distributed in an array.
Preferably, the nonlinear energy capturing assembly comprises a cantilever beam; a piezoelectric element and a second permanent magnet; one end of the cantilever beam is connected with the fixed support assembly, the second permanent magnet is installed at the other end of the cantilever beam, the top surface of the second permanent magnet is opposite to the bottom surface of the compact vibrator array assembly, and the size of the top surface of the second permanent magnet is matched with that of the bottom surface of the compact vibrator array assembly;
the piezoelectric element is arranged on the cantilever beam;
the cantilever beams are all made of materials with elastic deformation characteristics.
Preferably, the oscillator array bracket comprises a first connecting part and a second connecting part; the first connecting part is positioned at one end of the second connecting part; the other end of the second connecting part is arranged at the top end of the fixed bracket component;
the first connecting part is of a groove array structure, the groove array structure is matched with the compact vibrator array assembly, and the compact vibrator array assembly is arranged in the first connecting part;
preferably, the base and the upright posts are both made of aluminum alloy materials.
Preferably, the cantilever beam is made of a copper alloy material.
Preferably, the piezoelectric element is made of piezoelectric ceramics or flexible piezoelectric element polyvinylidene fluoride.
Preferably, the oscillator array support is made of an aluminum alloy material.
Preferably, the first permanent magnet and the second permanent magnet are both neodymium iron boron permanent magnets.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the piezoelectric energy harvesting device, a plurality of spring oscillator units with different resonant frequency ranges are utilized to realize large-amplitude response under different external excitation frequencies, and the practicability and the applicability of the piezoelectric energy harvesting device are remarkably improved.
2. The invention realizes the design of the ultra-wideband nonlinear piezoelectric energy collecting device by utilizing the compact vibrator array component and the nonlinear permanent magnetic force, has higher structural compactness and wider working bandwidth.
3. The invention has compact structure and strong practicability, and can be widely applied to various mechanical structures. Through the collection to external vibration energy, for the energy supply of low-power consumption device, can not produce the pollutant, be the energy output device of a green type.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a vibrator array support structure;
fig. 3 is a schematic structural view of a compact vibrator array assembly.
The figures show that:
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
The invention provides an ultra-wideband nonlinear piezoelectric energy collecting device utilizing a compact vibrator array, which comprises a compact vibrator array component, a vibrator array bracket 2, a nonlinear energy harvesting component and a fixed bracket component, wherein the compact vibrator array component is arranged on the vibrator array bracket 2; as shown in fig. 1, the compact oscillator array assembly is mounted on the oscillator array support 2, the oscillator array support 2 is mounted at the top end of the fixed support assembly, and the oscillator array support 2 is mounted in the middle of the fixed support assembly; the end part of the compact oscillator array component can move along the vertical direction, and the compact oscillator array component can drive the nonlinear energy harvesting component to vibrate through magnetic force, so that electric energy is output.
The fixed support assembly comprises an upright post 3 and a base 4, the upright post 3 is vertically arranged on the base 4, the oscillator array support 2 is arranged at the top end of the upright post 3, and the nonlinear energy harvesting assembly is arranged in the middle of the upright post 3; in a preferred embodiment, the base 4 is rectangular, and the base 4 and the upright column 3 are made of aluminum alloy materials. The bottom of the base 4 is provided with an installation surface, the installation surface is connected with an external part, and the external part provides external excitation for the ultra-wideband nonlinear piezoelectric energy collecting device utilizing the compact vibrator array.
As shown in fig. 3, the compact vibrator array assembly includes a plurality of spring vibrator units, each of the spring vibrator units includes a spring 1 and a first permanent magnet 8, one end of the spring 1 is mounted on the vibrator array support 2, and the other end is connected to the first permanent magnet 8; the rigidity of the springs 1 in the spring vibrator units is not completely the same, and the spring vibrator units are distributed in an array. In a preferred embodiment, the first permanent magnet 8 is a small block permanent magnet, the spring 1 is a coil spring, and the spring 1 is made of stainless steel. The natural frequency of the spring oscillator unit is controlled by the combination of the stiffness of the spring 1 and the mass of the first permanent magnet 8, and preferably, the natural frequency of different spring oscillator units can be different by making the lengths of the springs 1 in the plurality of spring oscillator units different. In a preferred embodiment, the natural frequency of each of the spring vibrator units in the compact vibrator array assembly is continuously different.
The nonlinear energy capturing component comprises a cantilever beam 6, a piezoelectric element 5 and a second permanent magnet 7; one end of the cantilever beam 6 is connected with the fixed support assembly, and specifically, one end of the cantilever beam 6 is connected with the middle part of the upright post 3. The second permanent magnet 7 is installed at the other end of the cantilever beam 6, the top surface of the second permanent magnet 7 is opposite to the bottom surface of the compact vibrator array assembly, and the size of the top surface of the second permanent magnet 7 is matched with the size of the bottom surface of the compact vibrator array assembly. In a preferred embodiment, the second permanent magnet 7 is a large block permanent magnet. In a preferred embodiment, the first permanent magnet 8 in the compact vibrator array assembly is directly opposite to and repels the second permanent magnet 7 in the non-linear energy capturing assembly. The cantilever beam 6 is made of a material with elastic deformation characteristic, preferably a copper alloy material.
The piezoelectric element 5 is mounted on the cantilever beam 6. Preferably, the piezoelectric element 5 is bonded to the upper and lower surfaces of one end of the cantilever 6 close to the upright post 3, and the piezoelectric element 5 can be piezoelectric ceramic PZT or a flexible piezoelectric element polyvinylidene fluoride PVDF.
The vibrator array bracket 2 can be made of an aluminum alloy material, and the vibrator array bracket 2 comprises a first connecting part 9 and a second connecting part 10; the first connecting part 9 is positioned at one end of the second connecting part 10; the other end of the second connecting part 10 is mounted at the top end of the fixed bracket assembly; first connecting portion 9 is the groove array structure, the groove array structure with compact oscillator array subassembly phase-match, just compact oscillator array subassembly is installed in first connecting portion 9, that is to say, the quantity of spring oscillator unit with the groove quantity is the same in oscillator array support 2, and the spring oscillator unit is installed in the groove. In a preferred embodiment, the first connecting portion 9 is integrally connected to the second connecting portion 10. In a preferred embodiment, as shown in fig. 2, the oscillator array bracket 2 is an L-shaped block, the end of the long side is connected to the top end of the upright post, and the inside of the short side is in a groove array structure. In a preferred embodiment, the grooves of the first connection parts 9 in the transducer array holder 2 are in a 3 × 3 array. The first permanent magnet 8 in the compact vibrator array assembly and the second permanent magnet 7 in the nonlinear energy capturing assembly are opposite and mutually exclusive. In a preferred embodiment, the first permanent magnet 8 and the second permanent magnet 7 are both neodymium iron boron permanent magnets.
The working principle of the invention is as follows:
when external excitation acts on the ultra-wideband nonlinear piezoelectric energy collecting device of the compact vibrator array through the base 4, the first permanent magnet 8 in the compact vibrator array assembly arranged in the vibrator array support 2 is driven by the spring 1 to start reciprocating motion along the vertical direction, the natural frequency of each spring vibrator unit is continuously different, and the natural frequency of at least one spring vibrator unit is close to the external excitation frequency. At this time, the corresponding first permanent magnet 8 will realize large excitation. The first permanent magnet 8 in the compact vibrator array assembly further excites the second permanent magnet 7 facing to the nonlinear energy harvesting assembly, and the nonlinear energy harvesting assembly can respond to external excitation under different frequencies. The second permanent magnet 7 generates alternating stress near one end of the cantilever beam 6 close to the upright post 3 under the action of nonlinear permanent magnet force, and the piezoelectric element 5 bonded on the cantilever beam 6 converts the alternating stress into an electric signal to be output. When the external vibration frequency changes, the compact vibrator array assembly has a plurality of groups of different resonant frequency ranges, and the first permanent magnet 8 in the compact vibrator array assembly can still realize large-amplitude reciprocating motion and further excite the nonlinear energy harvesting assembly under different external excitation frequencies, so that the ultra-wide-frequency nonlinear piezoelectric energy harvesting device can realize ultra-wide-frequency nonlinear piezoelectric energy harvesting under the action of the compact vibrator array assembly and the nonlinear permanent magnet, and further improves the practicability and the working efficiency.
The invention realizes the design of the ultra-wideband nonlinear piezoelectric energy collecting device by utilizing the compact vibrator array component and the nonlinear permanent magnetic force. Compared with a common cantilever beam array type broadband piezoelectric energy collecting device, the broadband piezoelectric energy collecting device has higher structural compactness and has wider working bandwidth compared with a common nonlinear piezoelectric energy collecting device. The piezoelectric energy harvesting device realizes large-amplitude response under different external excitation frequencies by utilizing the spring oscillator units in different resonance frequency ranges, and the practicability and the applicability of the piezoelectric energy harvesting device are obviously improved. Under the action of the nonlinear permanent magnetic force, the invention realizes nonlinear vibration energy collection so as to further improve energy harvesting efficiency. The invention simultaneously overcomes the defects of the existing common cantilever beam array type broadband piezoelectric energy collecting device that the structure is not compact, the frequency broadening range of the nonlinear piezoelectric energy collecting device is limited, and the like.
According to the invention, the first permanent magnet 8 in the spring oscillator unit further excites the second permanent magnet 7 facing to the inside of the nonlinear energy capturing assembly, so that the nonlinear energy capturing assembly can respond to external excitation under different frequencies, and the structure of the spring oscillator unit has higher compactness, thereby being beneficial to increasing the number of the spring oscillator units in the compact oscillator array assembly and simultaneously keeping the compactness of the whole structure. On the premise of keeping the compact integral structure, the designed piezoelectric energy collecting device can greatly widen the working bandwidth of the piezoelectric energy collecting device, and realizes the collection of nonlinear vibration energy under the action of permanent magnetic force so as to further improve the energy harvesting efficiency of the piezoelectric energy collecting device. Compared with a common cantilever beam array type broadband piezoelectric energy collecting device and a nonlinear piezoelectric energy collecting device, the cantilever beam array type broadband piezoelectric energy collecting device has a compact structure, the compact vibrator array component has multiple groups of different resonant frequency ranges, the working bandwidth is wider through superposition of the resonant frequency ranges, and nonlinear vibration energy collection is realized under the action of nonlinear permanent magnetic force, so that the energy harvesting efficiency is further improved.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. An ultra-wideband nonlinear piezoelectric energy collection device utilizing a compact vibrator array is characterized by comprising a compact vibrator array component, a vibrator array bracket (2), a nonlinear energy harvesting component and a fixed bracket component;
the compact vibrator array assembly is arranged on the vibrator array support (2), the vibrator array support (2) is arranged at the top end of the fixed support assembly, and the vibrator array support (2) is arranged in the middle of the fixed support assembly;
the end part of the compact oscillator array component can move along the vertical direction, and the compact oscillator array component can drive the nonlinear energy harvesting component to vibrate through magnetic force, so that electric energy is output.
2. The ultra-wideband nonlinear piezoelectric energy collection device utilizing a compact vibrator array as claimed in claim 1, characterized in that the fixed bracket component comprises a vertical pillar (3) and a base (4), the vertical pillar (3) is vertically installed on the base (4), a vibrator array bracket (2) is installed on the top end of the vertical pillar (3), and the nonlinear energy harvesting component is installed in the middle of the vertical pillar (3);
the bottom of the base (4) is provided with a mounting surface, and the mounting surface is connected with an external part.
3. The ultra-wideband nonlinear piezoelectric energy collection device using a compact vibrator array according to claim 1, wherein the compact vibrator array assembly includes a plurality of spring vibrator units, the spring vibrator units include springs (1) and first permanent magnets (8), one end of the springs (1) are mounted on the vibrator array support (2), and the other end is connected with the first permanent magnets (8); the rigidity of the springs (1) in the spring vibrator units is not completely the same, and the spring vibrator units are distributed in an array.
4. The ultra-wideband nonlinear piezoelectric energy harvesting apparatus with a compact dipole array according to claim 3, wherein the nonlinear energy harvesting component comprises a cantilever beam (6); a piezoelectric element (5) and a second permanent magnet (7); one end of the cantilever beam (6) is connected with the fixed support assembly, the second permanent magnet (7) is installed at the other end of the cantilever beam (6), the top surface of the second permanent magnet (7) is opposite to the bottom surface of the compact vibrator array assembly, and the size of the top surface of the second permanent magnet (7) is matched with that of the bottom surface of the compact vibrator array assembly;
the piezoelectric element (5) is mounted on the cantilever beam (6);
the cantilever beams (6) are all made of materials with elastic deformation characteristics.
5. The ultra-wideband nonlinear piezoelectric energy collection device with a compact vibrator array according to claim 1, wherein the vibrator array support (2) comprises a first connection portion (9) and a second connection portion (10); the first connecting part (9) is positioned at one end of the second connecting part (10); the other end of the second connecting part (10) is arranged at the top end of the fixed bracket component;
the first connecting portion (9) is of a groove array structure, the groove array structure is matched with the compact vibrator array assembly, and the compact vibrator array assembly is installed in the first connecting portion (9).
6. The ultra-wideband nonlinear piezoelectric energy harvesting device with a compact vibrator array according to claim 2, wherein the base (4) and the upright post (3) are made of aluminum alloy material.
7. The ultra-wideband nonlinear piezoelectric energy harvesting device with a compact vibrator array according to claim 4, wherein the cantilever beam (6) is made of copper alloy material.
8. The ultra-wideband nonlinear piezoelectric energy collecting device with a compact vibrator array according to claim 4, wherein the piezoelectric element (5) is made of piezoelectric ceramics or flexible piezoelectric element polyvinylidene fluoride.
9. The ultra-wideband nonlinear piezoelectric energy collection device with a compact vibrator array as claimed in claim 1, wherein said vibrator array holder (2) is made of aluminum alloy material.
10. The ultra-wideband nonlinear piezoelectric energy harvesting device with a compact dipole array according to claim 4, characterized in that both the first permanent magnet (8) and the second permanent magnet (7) are neodymium iron boron permanent magnets.
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| KR20210125794A (en) * | 2020-04-09 | 2021-10-19 | 한국과학기술연구원 | Self-resonance tuning energy harvester using Adaptive clamp |
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| WO2013036971A1 (en) * | 2011-09-08 | 2013-03-14 | The Research Foundation Of State University Of New York | Granular mechanical device to dynamically extract dissipated energy and method |
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| KR20210125794A (en) * | 2020-04-09 | 2021-10-19 | 한국과학기술연구원 | Self-resonance tuning energy harvester using Adaptive clamp |
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