CN110212809B - Adaptive coupled nonlinear energy capture system - Google Patents
Adaptive coupled nonlinear energy capture system Download PDFInfo
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- CN110212809B CN110212809B CN201910495919.5A CN201910495919A CN110212809B CN 110212809 B CN110212809 B CN 110212809B CN 201910495919 A CN201910495919 A CN 201910495919A CN 110212809 B CN110212809 B CN 110212809B
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- 230000003044 adaptive effect Effects 0.000 title description 5
- 239000012530 fluid Substances 0.000 claims abstract description 39
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 abstract description 10
- 238000010168 coupling process Methods 0.000 abstract description 10
- 238000005859 coupling reaction Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 230000000737 periodic effect Effects 0.000 description 3
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H02N2/185—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using fluid streams
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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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- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The invention discloses a self-adaptive coupling nonlinear energy capturing system which comprises a support, a crank, a piezoelectric cantilever beam, a bluff body, a vibrating magnet, a slide rail, a slide block and a sliding magnet. The sliding rail is fixed at the bottom of the support through a bolt, a plurality of sliding blocks are mounted on the sliding rail, the sliding blocks can slide on the sliding rail, and a sliding magnet is fixed on each sliding block; the crank is installed at the top of the support through a hole formed in the top of the support and can rotate in the hole, the piezoelectric cantilever beam is installed at the bottom of the crank, the tail end of the piezoelectric cantilever beam is connected with a blunt body, and a plurality of vibrating magnets are fixed at the bottom of the blunt body. The invention realizes the self-adaptability of the energy capture system to incoming flows in different directions by designing the rotatable crank, solves the problem of efficiency reduction of the traditional energy capture system when the incoming flow direction is changed, and simultaneously leads the energy capture system to have high energy capture efficiency under different fluid flow rates by introducing the nonlinear magnetic field force through the magnet.
Description
Technical Field
The invention belongs to the technical field of energy capture, and particularly relates to a self-adaptive coupling nonlinear energy capture system.
Background
Energy is the driving force of the development of human society, and since the 21 st century, along with the continuous improvement of the industrial level, the energy problem also becomes the focus of the attention of all countries in the world. At present, the demand of rapid economic development on energy is continuously increased, and the fossil energy reserves in the nature are limited, so that the requirement of sustainable development of the human society cannot be met. Therefore, the development and utilization of renewable energy sources using energy capture technologies is essential.
The fluid energy of fluids such as air flow and water flow which are ubiquitous in the environment is a renewable energy source with development potential, and is paid attention by researchers in the technical field of energy capture. Currently, energy capture devices that generate electricity from fluid energy are primarily single degree of freedom, with good energy capture efficiency only in one direction, and such energy capture devices suffer a significant decrease in efficiency when the fluid direction changes. However, the flow velocity and direction of the fluid in real life are often uncertain, which makes the energy capture efficiency of the conventional fluid energy collection system low, and therefore, it is necessary to design a new energy capture system to improve the energy capture efficiency.
Disclosure of Invention
In order to solve the above problems, the present invention provides an adaptive coupling nonlinear energy capture system, which can automatically adjust the direction according to the incoming flow direction, and has high energy capture efficiency under incoming flows with different flow rates and directions.
The invention is realized by the following technical scheme:
an adaptively coupled nonlinear energy capture system, characterized by: the piezoelectric actuator comprises a support, a crank, a piezoelectric cantilever beam, a bluff body, a vibrating magnet, a sliding rail, a sliding block and a sliding magnet. The sliding rail is fixed at the bottom of the support through a bolt, a plurality of sliding blocks are mounted on the sliding rail, the sliding blocks can slide on the sliding rail, and a sliding magnet is fixed on each sliding block; the crank is installed at the top of the support through a hole formed in the top of the support and can rotate in the hole, the piezoelectric cantilever beam is installed at the bottom of the crank, the tail end of the piezoelectric cantilever beam is connected with a blunt body, and a plurality of vibrating magnets are fixed at the bottom of the blunt body.
The support is made of a non-magnetic material, and the sliding rail and the sliding block are made of aluminum alloy materials.
The crank can rotate in a hole formed in the top of the support, the crank and the support are well lubricated, and friction force between the crank and the support is small.
The sliding block can slide on the sliding rail, and the sliding magnet fixed on the sliding block slides on the sliding rail through the sliding block.
The blunt body is light in weight and large in volume, and a fluid passing through the blunt body generates a significant fluid force acting on the blunt body.
Piezoelectric materials are attached to the surface of the piezoelectric cantilever beam, and the piezoelectric materials are subjected to stress strain to generate electricity through the vibration of the piezoelectric cantilever beam.
The sliding magnets arranged on the sliding rail can generate nonlinear magnetic force on the vibrating magnet, and the energy capture efficiency is improved.
The principle is as follows: when fluid flows through the self-adaptive coupling nonlinear energy capture system, due to the fluid-solid coupling effect, the crank rotates around the hole formed in the top of the support due to the fluid force generated by the piezoelectric cantilever beam and the blunt body, and the crank stops rotating and keeps the position unchanged until the torque of the fluid force on the hole is zero. At the moment, fluid force flows through the blunt body to generate vortex, the vortex acts on the piezoelectric cantilever beam to generate flow-induced vibration, and therefore electricity is generated through the piezoelectric material on the surface of the piezoelectric cantilever beam, and the purpose of converting fluid energy into electric energy is achieved. Under the action of a certain flow velocity of fluid, the periodic fluid force on the surface of the blunt body enables the blunt body and the piezoelectric cantilever beam to generate flow-induced vibration. However, conventional energy capture devices can only provide high energy capture efficiency when the frequency of the generated fluid force is relatively close to the natural frequency of the piezoelectric cantilever, resulting in narrow flow rates for efficient operation. Therefore, the self-adaptive coupling nonlinear energy capture system can adapt to fluids with different flow rates by introducing the nonlinear magnetic field force through the sliding magnet, namely, the self-adaptive coupling nonlinear energy capture system can keep higher energy capture efficiency under the action of the fluids with different flow rates.
The invention has the characteristics and advantages that: the self-adaptability of the energy capture device to incoming flows in different directions is realized by designing the rotatable crank, the problem that the efficiency of the traditional energy capture device is reduced when the incoming flow direction is changed is solved, and meanwhile, the nonlinear magnetic field force is introduced through the magnet, so that the energy capture device has higher energy capture efficiency under different fluid flow rates.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional structure of an adaptive coupled nonlinear energy capture system according to the present invention.
FIG. 2 is a schematic view of the initial position of the crank of the present invention.
Fig. 3 is a schematic view of the stable position of the crank of the present invention after fluid flow in a direction perpendicular to the plane of the paper.
1 … … support 2 … … crank
3 … … piezoelectric cantilever 4 … … bluff body
5 … … vibrating magnet 6 … … slide rail
7 … … slider 8 … … sliding magnet
Detailed description of the preferred embodiments
The invention is described in detail below with reference to the figures and examples.
Example 1
As shown in fig. 1, the present embodiment provides an adaptive coupling nonlinear energy capture system, which includes a support 1, a crank 2, a piezoelectric cantilever 3, a blunt body 4, a vibrating magnet 5, a slide rail 6, a slider 7 and a sliding magnet 8. The sliding rail 6 is fixed at the bottom of the support 1 through a bolt, a plurality of sliding blocks 7 are installed on the sliding rail 6, the sliding blocks 7 can slide on the sliding rail 6, and a sliding magnet 8 is fixed on each sliding block 7; the crank 2 is installed at the top of the support 1 through a hole formed in the top of the support 1 and can rotate in the hole, the piezoelectric cantilever beam 3 is installed at the bottom of the crank 2, the tail end of the piezoelectric cantilever beam 3 is connected with a blunt body 4, and a plurality of vibrating magnets 5 are fixed at the bottom of the blunt body 4.
The support 1 is made of a non-magnetic material, and the slide rail 6 and the slide block 7 are both made of an aluminum alloy material. The crank 2 can rotate in a hole at the top of the support 1, and the crank 2 and the support 1 are well lubricated and have small friction force. The slide block 7 can slide on the slide rail 6, and the slide magnet 8 fixed on the slide block 7 can slide on the slide rail 6 through the slide block 7. The blunt body 4 is light in weight and large in volume, and a fluid passing through the blunt body 4 generates a significant fluid force acting on the blunt body 4. The surface of the piezoelectric cantilever beam 3 is adhered with a piezoelectric material, and the vibration of the piezoelectric cantilever beam 3 drives the piezoelectric material to generate electricity. The sliding magnets 8 arranged on the sliding rail 6 can generate nonlinear magnetic force on the vibrating magnet 5, and the energy capture efficiency is improved.
As shown in fig. 2, the crank 2 is in any initial position, and the crank 2 remains stationary when no fluid flows through it.
As shown in FIG. 3, when a fluid flows in a direction vertical to the paper, fluid force is generated on the surfaces of the blunt body 4 and the piezoelectric cantilever beam 3, the crank 2 rotates in the hole due to the torque of the fluid force on the hole arranged at the top of the support 1, and the crank 2 stops rotating and keeps the existing position until the torque of the fluid force on the hole arranged at the top of the support 1 is zero.
After the fluid in any direction flows through, the crank 2 rotates to the corresponding position in a self-adaptive way under the action of the fluid force and keeps the position. At this time, when the fluid flows through the blunt body 4, asymmetric shedding vortices are formed on two sides of the blunt body 4, so that a periodic pressure difference is formed on two sides of the blunt body 4, the blunt body 4 and the piezoelectric cantilever beam 3 generate flow-induced vibration, and the piezoelectric material attached to the surface of the piezoelectric cantilever beam 3 generates electric energy when the piezoelectric cantilever beam 3 vibrates.
Under the action of a certain flow rate of fluid, the periodic fluid force on the surface of the blunt body 4 causes the blunt body 4 and the piezoelectric cantilever beam 3 to generate flow-induced vibration. However, the conventional energy capture device can only achieve a high energy harvesting efficiency when the frequency of the generated fluid force is relatively close to the natural frequency of the piezoelectric cantilever 3. Therefore, the self-adaptive coupling nonlinear energy capture system can adapt to fluids with different flow rates by introducing the nonlinear magnetic field force through the sliding magnet 8, namely, the self-adaptive coupling nonlinear energy capture system can keep higher energy capture efficiency under the action of the fluids with different flow rates.
The invention provides a self-adaptive coupling nonlinear energy capture system, which realizes the self-adaptability of the system to incoming flows in different directions by designing a rotatable crank, solves the problem of low efficiency of the traditional energy capture device when the incoming flow direction is changed, and simultaneously leads the system to have higher energy capture efficiency under different fluid flow rates by introducing nonlinear magnetic field force through a magnet.
The above embodiments are merely illustrative of the principles and purposes of the present invention, and are not intended to limit the invention, and any variations, modifications, or equivalent arrangements which fall within the spirit and scope of the invention are intended to be included therein.
Claims (4)
1. An adaptively coupled nonlinear energy capture system, characterized by: the piezoelectric actuator comprises a support, a crank, a piezoelectric cantilever beam, a bluff body, a vibrating magnet, a slide rail, a slide block and a sliding magnet; the sliding rail is fixed at the bottom of the support through a bolt, a plurality of sliding blocks are mounted on the sliding rail, the sliding blocks can slide on the sliding rail, and a sliding magnet is fixed on each sliding block; the crank is installed through the hole that the support top was established the support top and can rotate in the hole, the piezoelectric cantilever beam is installed to the crank bottom, piezoelectric cantilever beam end connection one the bluff body, the bluff body bottom is fixed a plurality of vibrating magnet.
2. The adaptively coupled nonlinear energy capture system of claim 1, wherein: the support is made of a non-magnetic material, and the sliding rail and the sliding block are made of aluminum alloy materials.
3. The adaptively coupled nonlinear energy capture system of claim 1, wherein: the fluid flowing through the bluff body generates significant fluid forces acting on the bluff body.
4. The adaptively coupled nonlinear energy capture system of claim 1, wherein: the sliding magnets arranged on the sliding rail can generate nonlinear magnetic force on the vibrating magnet, and the energy capture efficiency is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910495919.5A CN110212809B (en) | 2019-06-10 | 2019-06-10 | Adaptive coupled nonlinear energy capture system |
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| CN201910495919.5A CN110212809B (en) | 2019-06-10 | 2019-06-10 | Adaptive coupled nonlinear energy capture system |
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| CN110212809A CN110212809A (en) | 2019-09-06 |
| CN110212809B true CN110212809B (en) | 2020-10-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9431928B2 (en) * | 2013-11-06 | 2016-08-30 | Oscilla Power Inc. | Power production in a completed well using magnetostrictive materials |
| CN107196556B (en) * | 2017-07-25 | 2023-09-22 | 青岛大学 | Crank slider type piezoelectric power generation device utilizing wave energy |
| CN107395054B (en) * | 2017-08-17 | 2023-07-11 | 浙江师范大学 | Indirectly excited multi-vibrator piezoelectric wind driven generator |
| CN107332466B (en) * | 2017-08-17 | 2023-06-27 | 浙江师范大学 | Multi-vibrator piezoelectric wind energy capture device |
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