CN110661450B - Piezoelectric vibrator with non-linear differential geometric characteristics - Google Patents
Piezoelectric vibrator with non-linear differential geometric characteristics Download PDFInfo
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- H—ELECTRICITY
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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
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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
- H02N2/188—Vibration harvesters adapted for resonant operation
Abstract
The invention provides a piezoelectric vibrator with nonlinear differential geometric characteristics, which is characterized by comprising a support; the vibrator body is in a cantilever shape, one end of the vibrator body is mounted on the support, the vibrator body comprises a first piezoelectric layer, an intermediate layer and a second piezoelectric layer, the first piezoelectric layer, the intermediate layer and the second piezoelectric layer are sequentially stacked in a direction perpendicular to the extending direction of the vibrator body, the first piezoelectric layer and the second piezoelectric layer are made of piezoelectric materials, the intermediate layer is made of conductive materials, and the extending path of the vibrator body is a nonlinear space curve; and the mass block is arranged at the free tail end of the vibrator body and is used for driving the vibrator body to vibrate together under external excitation. The quality piece drives the oscillator body and vibrates together under the external excitation, and first piezoelectric layer and second piezoelectric layer produce the potential difference because of piezoelectric effect to can convert external excitation into the electric energy, and the oscillator body produces nonlinear resonance more easily, and energy collection efficiency is higher.
Description
Technical Field
The invention relates to the technical field of piezoelectric power generation, in particular to a piezoelectric vibrator with nonlinear differential geometric characteristics.
Background
The vibrating piezoelectric generator has simple structure, high energy density and good miniaturization, and is one of the focuses of the current vibrating micro generator research. However, the output power of the current vibration type piezoelectric generator is still limited in a plurality of fields, wherein the resonance frequency band of the linear piezoelectric vibrator adopted by the linear piezoelectric generator is narrow, and the excitation of the external environment is often time-varying in a broadband range, so that the linear piezoelectric vibrator is often difficult to satisfy the resonance state, and the energy collection efficiency is greatly reduced.
Therefore, it is also necessary to provide a new piezoelectric vibrator to solve the above problems.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a piezoelectric vibrator with non-linear differential geometry characteristics and high energy collection efficiency.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a piezoelectric vibrator with non-linear differential geometric characteristics is characterized by comprising a support; the vibrator body is in a cantilever shape, one end of the vibrator body is mounted on the support, the vibrator body comprises a first piezoelectric layer, an intermediate layer and a second piezoelectric layer, the first piezoelectric layer, the intermediate layer and the second piezoelectric layer are sequentially stacked in a direction perpendicular to the extending direction of the vibrator body, the first piezoelectric layer and the second piezoelectric layer are made of piezoelectric materials, the intermediate layer is made of conductive materials, and the extending path of the vibrator body is a nonlinear space curve; and the mass block is arranged at the free tail end of the vibrator body and is used for driving the vibrator body to vibrate together under external excitation.
Preferably, the structure of the first piezoelectric layer and the second piezoelectric layer is symmetrical with respect to the intermediate layer.
Preferably, the cross-sectional shape of the vibrator body is one of a rectangle, a triangle, a circle and an ellipse.
Preferably, the support comprises a first pressing block, a second pressing block and a bolt, the middle layer is located between the first pressing block and the second pressing block, and the bolt is used for locking the first pressing block and the second pressing block to press the middle layer.
Preferably, the intermediate layer and the first piezoelectric layer or the second piezoelectric layer are bonded by an electrically conductive adhesive.
Preferably, the intermediate layer is made of metal, and the first piezoelectric layer and the second piezoelectric layer are made of piezoelectric ceramics.
Preferably, the vibrator body further comprises two conductive layers, and the two conductive layers are respectively arranged on the outer surfaces of the first piezoelectric layer and the second piezoelectric layer.
Preferably, the conductive layer is a conductive film.
Preferably, the conductive layer and the first piezoelectric layer or the second piezoelectric layer are bonded by a conductive adhesive.
Preferably, the extending path of the vibrator body is one of a spatial cylindrical spiral line, a spatial cosine line, a spatial elliptic curve and a spatial parabola.
Compared with the prior art, the invention mainly has the following beneficial effects:
the mass block drives the vibrator body to vibrate together under external excitation, the first piezoelectric layer and the second piezoelectric layer generate potential difference due to piezoelectric effect, so that the external excitation can be converted into electric energy, nonlinear resonance such as super harmonic resonance, sub harmonic resonance, combined resonance, multiple resonance and the like can be generated more easily due to the fact that the extension path of the vibrator body is a nonlinear space curve, and the energy collection efficiency of the piezoelectric vibrator is higher.
Drawings
In order to illustrate the solution of the present application more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural view of a piezoelectric vibrator according to the present invention;
fig. 2 is a schematic view of the structure of the cradle 10 according to the present invention.
Fig. 3 is a sectional view of a vibrator body according to the present invention;
fig. 4 is a schematic diagram of the extended path of the vibrator body in the invention, which is a spatial cylindrical spiral line;
fig. 5 is a schematic view of the extended path of the vibrator body related to the present invention as a spatial cosine line;
fig. 6 is a schematic diagram of the extending path of the vibrator body according to the present invention being a space elliptic curve;
fig. 7 is a schematic view showing a transducer body according to the present invention, in which an extension path is a space parabola.
Reference numerals:
100-piezoelectric vibrator, 10-support, 20-vibrator body, 21-first piezoelectric layer, 22-middle layer, 23-second piezoelectric layer, 24-conducting layer and 30-mass block.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Fig. 1 is a schematic structural view of a piezoelectric vibrator 100 according to the present invention.
As shown in fig. 1, a piezoelectric vibrator 100 according to a preferred embodiment of the present invention includes a support 10, a vibrator body 20, and a mass 30. One end of the vibrator body 20 is mounted to the support 10, and the mass 30 is mounted to a free end of the vibrator body 20. In fig. 1, the support 10 is a simplified structural schematic.
Fig. 2 is a schematic view of the structure of the cradle 10 according to the present invention.
In the present embodiment, the holder 10 is used to support the vibrator body 20. As shown in fig. 2, the support 10 includes a first press piece 11, a second press piece 12, and bolts 13, the intermediate layer 22 is located between the first press piece 11 and the second press piece 12, and the two bolts 13 are used for locking the first press piece 11 and the second press piece 12 to compress the intermediate layer 22. The first and second compacts 11, 12 may be made of an insulating rigid material, such as plastic or ceramic. Preferably, the first and second compacts 11, 12 are made of transparent plastic.
Fig. 3 is a sectional view of the transducer body 20 according to the present invention.
In the present embodiment, the transducer body 20 is used to convert external excitation into electric energy. The vibrator body 20 is in a cantilever shape, and one end of the vibrator body 20 is attached to the support 10. The transducer body 20 has a non-linearized differential geometry. As shown in fig. 3, the transducer body 20 includes: a first piezoelectric layer 21, an intermediate layer 22, a second piezoelectric layer 23, a conductive layer 24. The first piezoelectric layer 21, the intermediate layer 22, and the second piezoelectric layer 23 are sequentially laminated in a direction perpendicular to the extending direction of the vibrator body 20, the first piezoelectric layer 21 and the second piezoelectric layer 23 are made of a piezoelectric material, and the intermediate layer 22 is made of a conductive material. The intermediate layer 22 may serve as a common electrode for the first piezoelectric layer 21 and the second piezoelectric layer 23. Two conductive layers 24 are provided on the outer surfaces of the first piezoelectric layer 21 and the second piezoelectric layer 23, respectively. Preferably, the first piezoelectric layer 21 and the second piezoelectric layer 23 are made of piezoelectric crystals or piezoelectric ceramics. The intermediate layer 22 is made of a metal, such as nickel alloy, bronze or copper. This improves the mechanical properties of the transducer body 20 and prolongs the operating life of the transducer body 20 during vibration. Preferably, the structure of the first piezoelectric layer 21 and the second piezoelectric layer 23 is symmetrical with respect to the intermediate layer 22, and the vibrator body 20 has a symmetrical mechanical structure in a cross section perpendicular to the extending direction of the vibrator body 20. This contributes to the resonance of the transducer body 20 under external excitation, thereby improving the energy collection efficiency. Furthermore, the structure of the first piezoelectric layer 21 and the second piezoelectric layer 23 is symmetrical with respect to the intermediate layer 22, and the force applied to the intermediate layer 23 during vibration may be zero. Preferably, the vibrator body 20 is vertically mounted to the support 10, that is, at the junction of the vibrator body 20 and the support 10, the extending direction of the vibrator body 20 is perpendicular to the support 10. This can improve the mechanical strength of the connection between the vibrator body 20 and the holder 10, and can extend the operating life of the vibrator body 20 during vibration. If the connection point between the vibrator body 20 and the support 10 has an acute angle, stress concentration occurs, and the operation life of the vibrator body 20 may be shortened. Preferably, the conductive layer 24 is a conductive thin film, so that the weight of the vibrator body 20 can be reduced, which contributes to the extension of the operating life of the vibrator body 20, and the moving speed of the electric charges generated in the vibrator body 20 can be increased, thereby improving the energy collection efficiency. The conductive layer 24 may be made of copolymer polyvinylidene fluoride. The sectional shape of the vibrator body 20 is one of a rectangle, a triangle, a circle and an ellipse, and the sectional shape of the vibrator body 20 may also be a polygon, such as a regular hexagon or a regular octagon. Preferably, the vibrator body 20 has a rectangular cross-sectional shape, so that the vibrator body 20 can have a symmetrical mechanical structure, thereby contributing to the generation of resonance of the vibrator body 20 under external excitation and improving energy collection efficiency. The intermediate layer 22 is bonded to the first piezoelectric layer 21 or the second piezoelectric layer 22 by a conductive adhesive. The conductive layer 24 is bonded to the first piezoelectric layer 21 or the second piezoelectric layer 22 by a conductive adhesive. The conductive adhesive can be RTP-801 room temperature curing adhesive or epoxy resin adhesive.
In the present embodiment, the mass 30 is mounted at the free end of the vibrator body 20, and the mass 30 is used for driving the vibrator body 20 to vibrate together under external excitation. The external excitation refers to the vibration of the environment, and can be the mechanical vibration of the transient contact, and can also be the sound wave. The mass 30 may be made of an insulating rigid material, such as ceramic or plastic. The mass 30 may also be a metal that has been protected by insulation. The mass 30 may be bonded to the free end of the vibrator body 20.
In the present embodiment, the operating principle of the piezoelectric vibrator 100 is: along with the vibration of the environment, the mass block 30 is acted by the inertia force to cause the vibrator body 20 to deform, thereby causing the change of the strain and the stress in the piezoelectric layer; due to the piezoelectric effect a varying potential difference will be generated between the first piezoelectric layer 21 and the second piezoelectric layer 23, the two conductive layers 24 acting as lead-out electrodes, which can supply power to the load. The vibration of the mass 30 induces deformation of the transducer body 20, causing polarization of the piezoelectric material, which generates positive and negative charges that move to the two poles, i.e., polarization. When the environmental vibration frequency is equal to the natural frequency of the vibrator body 20, the resonance of the vibrator body 20 is caused, and the variation of the stress and strain of the piezoelectric layer is maximized, thereby maximizing the variation of the output voltage of the generator. In some cases, the vibration direction of the vibrator body 20 is related to the polarization direction. As an important means for the research of nonlinear piezoelectric power generation, structural nonlinearity often widens the resonant frequency of a piezoelectric power generator without limiting a special piezoelectric material or adding an external nonlinear force or motion. The application aims to apply the nonlinear resonance design theory to piezoelectric power generation, and designs a bending cantilever beam structure with nonlinear differential geometric characteristics to obtain the piezoelectric vibrator 100 with optimized resonance frequency band. Due to the diversity of external excitation, more and richer choices of parameter equations of the traction curve are obtained, and meanwhile, the section shapes of the bending cantilever beams are flexible and changeable, so that the formed piezoelectric vibrator 100 realizes the control of the resonance frequency band through structural differential geometric characteristic nonlinearity. The nonlinear piezoelectric vibrator 100 has a small volume, a light weight and a variable geometric structure, and can be widely applied to the field of micro piezoelectric power generation.
Compared with the piezoelectric vibrator 100 with nonlinear differential geometric characteristics, the piezoelectric vibrator adopted by the linear piezoelectric power generation mechanism has a simple structure, can utilize a single/multiple degree of freedom model formed by mass-spring-damping or an Euler-Bernoulli equation to quickly complete solution, but the resonance frequency band of the linear piezoelectric vibrator is narrow, the excitation of an external environment is time-varying in a broadband range, so that the linear piezoelectric vibrator is often difficult to meet the resonance state, and good performance output cannot be obtained. In order to improve the above properties and widen the resonance frequency band, one of the methods is to apply a nonlinear magnetic field (permanent magnet or electromagnet) to the linear piezoelectric vibrator. However, after the nonlinear magnetic field is applied, it is required to solve the force-electric-magnetic multi-field coupling relationship and the numerical calculation methods related to the longgutta and the like are complicated and difficult to calculate, so the application proposes to nonlinearize the piezoelectric vibrator instead of applying the nonlinear force or the nonlinear field. The nonlinear piezoelectric vibrator suitable for the multi-vibration model is designed through the nonlinearity of the differential geometric characteristics of the piezoelectric vibrator. The shape of the nonlinear piezoelectric vibrator is obtained by scanning a cross-sectional curve along a traction curve, wherein the traction curve is an arbitrary three-dimensional smooth curve instead of a plane curve. The three-dimensional curve direction is flexible, the section figures are rich and changeable, and the section figures can be round, oval, quadrilateral and the like; meanwhile, compared with the solution of the force-electric-magnetic multi-field coupling relationship for increasing the nonlinear field, the solution of the equation for establishing the force-electric coupling relationship is relatively simpler.
In this embodiment, the vibrator body 20 may be hollowAn arbitrary curve in between makes a simple entity of the configuration. Preferably, the extending path of the vibrator body 20 is a non-linear space curve. Compared with a traditional piezoelectric vibrator with a linear cantilever structure, the vibrator body 20 has a more flexible shape, and the extending path of the vibrator body is a nonlinear space curve, so that nonlinear resonance such as super-harmonic resonance, sub-harmonic resonance, combined resonance and multiple resonance can be generated more easily, and the energy collection efficiency is higher. The space curve formed by the extending path of the vibrator body 20 can be called a traction curve, and the parametric equation can be expressed as:
wherein t is a motion parameter variable. The difference of the parameter equations can cause the structure shape of the vibrator body 20 to generate obvious difference; meanwhile, the section shape of the vibrator body 20 is changeable, and can be rectangular, triangular, circular and the like; by selecting the traction curve parametric equation and the cross-sectional shape, the piezoelectric vibrator 20 capable of forming nonlinear resonances such as super-harmonic resonance, sub-harmonic resonance, combined resonance, multiple resonance and the like in different directions can be obtained under the external excitation condition of vibration. The selection of the traction curve is generally closely related to the external stimulus. Compared with the traditional piezoelectric vibrator with a linear cantilever structure, the piezoelectric vibrator is more flexible in shape, can generate nonlinear resonance such as super-harmonic resonance, sub-harmonic resonance, combined resonance and multiple resonance more easily, and is higher in energy collection efficiency. The piezoelectric vibrator 100 with the nonlinear differential geometric characteristics adopts a space curve configuration mode, has the advantages of simple structure, light weight, changeable cross section shape and small volume, and is more abundantly applied to the field of miniature piezoelectric power generation devices. Therefore, the piezoelectric vibrator 100 according to the present invention can be widely applied to a micro vibration type piezoelectric generator, and a high-efficiency piezoelectric power generation effect is achieved.
In the present embodiment, the spatial curve formed by the extending path of the vibrator body 20 may be one of a spatial cylindrical spiral line, a spatial cosine line, a spatial elliptic curve, and a spatial parabola.
Fig. 4 is a schematic diagram showing the extending path of the transducer body 20 according to the present invention as a spatial cylindrical spiral. Fig. 4(a) is a schematic structural diagram of the extending path of the transducer body 20 being a spatial cylindrical spiral; fig. 4(b) is a schematic view in which the piezoelectric direction applied to the transducer body 20 is along the radial direction of the cylindrical spiral; fig. 4(c) is a schematic diagram in which the direction of the applied piezoelectric force to the transducer body 20 is perpendicular to the radial direction of the cylindrical spiral.
As shown in fig. 4(a), the space curve formed by the extending path of the transducer body 20 is a cylindrical spiral line, and the parameter equation is as follows:
t is more than or equal to-pi and less than or equal to-2 pi/5. Wherein: m is the spiral radius of the traction cylindrical spiral line, and m is 15; t is a motion parameter variable, -pi is more than or equal to t is less than or equal to 0; n is the pitch parameter of the traction cylindrical spiral line, and n is 4. The vibrator body 20 has a rectangular cross-sectional shape.
As shown in fig. 4(b), the space curve formed by the extending path of the transducer body 20 is a cylindrical spiral line, and the piezoelectric direction is along the radial direction of the cylindrical spiral line. R represents the radial direction of the cylindrical spiral, and F represents the piezoelectric direction.
As shown in fig. 4(c), the space curve formed by the extending path of the transducer body 20 is a cylindrical spiral line, and the piezoelectric direction is perpendicular to the radial direction of the cylindrical spiral line. R represents the radial direction of the cylindrical spiral, and F represents the piezoelectric direction.
Fig. 5 is a schematic view showing a spatial cosine line as an extension path of the vibrator body 20 according to the present invention.
As shown in FIG. 5, the space curve formed by the extension path of the vibrator body 20 is a space cosine line, and the parameter equation is
-pi ≦ t ≦ pi. The vibrator body 20 has a rectangular cross-sectional shape.
Fig. 6 is a schematic diagram showing the extending path of the transducer body 20 according to the present invention as a spatial elliptic curve.
As shown in fig. 6, the space curve formed by the extending path of the transducer body 20 is a space elliptic curve, and the parameter equation is:
-pi ≦ t ≦ pi. The vibrator body 20 has a rectangular cross-sectional shape.
Fig. 7 is a schematic diagram showing the extending path of the transducer body 20 according to the present invention as a space parabola.
As shown in fig. 7, the space curve formed by the extending path of the transducer body 20 is a space parabola, and the parametric equation is:
-pi ≦ t ≦ pi. The vibrator body 20 has a rectangular cross section.
In the present embodiment, the transducer body 20 may be a simple entity configured by an arbitrary curve of space. Compared with a traditional piezoelectric vibrator with a linear cantilever structure, the vibrator body 20 related to the application has more flexible shape, and the extending path of the vibrator body is a space curve, so that nonlinear resonance such as super-harmonic resonance, sub-harmonic resonance, combined resonance and multiple resonance can be generated more easily, and the energy collection efficiency is higher.
It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.
Claims (9)
1. A differential geometry nonlinearized piezoelectric vibrator, comprising:
a support;
the vibrator body is in a cantilever shape, one end of the vibrator body is mounted on the support, the vibrator body comprises a first piezoelectric layer, an intermediate layer and a second piezoelectric layer, the first piezoelectric layer, the intermediate layer and the second piezoelectric layer are sequentially stacked in a direction perpendicular to the extending direction of the vibrator body, the first piezoelectric layer and the second piezoelectric layer are made of piezoelectric materials, the intermediate layer is made of conductive materials, and the extending path of the vibrator body is a nonlinear space curve; the intermediate layer serves as a common electrode for the first piezoelectric layer and the second piezoelectric layer;
the mass block is arranged at the free tail end of the vibrator body and is used for driving the vibrator body to vibrate together under external excitation;
the two conducting layers are respectively arranged on the outer surfaces of the first piezoelectric layer and the second piezoelectric layer;
the non-linear spatial curve is determined based on the following formula:
wherein c is the nonlinear space curve; t is a motion parameter variable; x is a motion curve in the x-axis direction; y is a motion curve in the x-axis direction; z is the motion curve in the x-axis direction.
2. The piezoelectric vibrator according to claim 1,
the structure of the first piezoelectric layer and the second piezoelectric layer is symmetrical with respect to the intermediate layer.
3. The piezoelectric vibrator according to claim 1,
the cross section of the vibrator body is in one of a rectangular shape, a triangular shape, a circular shape and an oval shape.
4. The piezoelectric vibrator according to claim 1,
the support comprises a first pressing block, a second pressing block and a bolt, the middle layer is located between the first pressing block and the second pressing block, and the bolt is used for locking the first pressing block and the second pressing block to tightly press the middle layer.
5. The piezoelectric vibrator according to claim 1,
the intermediate layer is bonded to the first piezoelectric layer or the second piezoelectric layer by a conductive adhesive.
6. The piezoelectric vibrator according to claim 1,
the intermediate layer is made of metal, and the first piezoelectric layer and the second piezoelectric layer are made of piezoelectric crystal or piezoelectric ceramic.
7. The piezoelectric vibrator according to claim 1,
the conductive layer is a conductive film.
8. The piezoelectric vibrator according to claim 7,
the conductive layer is bonded to the first piezoelectric layer or the second piezoelectric layer by a conductive adhesive.
9. The piezoelectric vibrator according to claim 1,
the extension path of the vibrator body is one of a space cylindrical spiral line, a space cosine line, a space elliptic curve and a space parabola.
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| CN116780939B (en) * | 2023-08-24 | 2023-11-21 | 河南工学院 | Wave power generation floating body based on differential geometric feature nonlinear piezoelectric vibrator |
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|---|---|---|---|---|
| CN2369412Y (en) * | 1997-02-04 | 2000-03-15 | 焦秉立 | Curved piezoelectric vibrator |
| CN102291043A (en) * | 2011-08-16 | 2011-12-21 | 华中科技大学 | Helical spring type low-frequency piezoelectric energy arrester |
| CN105305881A (en) * | 2015-11-26 | 2016-02-03 | 北京工业大学 | Arc vibration energy collector based on piezoelectricity |
| CN207442719U (en) * | 2017-11-27 | 2018-06-01 | 浙江三花智能控制股份有限公司 | Energy capture sensor, vibration generating device and vehicle-mounted detecting system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100956076B1 (en) * | 2008-10-02 | 2010-05-07 | 한국과학기술연구원 | High efficiency piezoelectric energy harvester which having spiral structure |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2369412Y (en) * | 1997-02-04 | 2000-03-15 | 焦秉立 | Curved piezoelectric vibrator |
| CN102291043A (en) * | 2011-08-16 | 2011-12-21 | 华中科技大学 | Helical spring type low-frequency piezoelectric energy arrester |
| CN105305881A (en) * | 2015-11-26 | 2016-02-03 | 北京工业大学 | Arc vibration energy collector based on piezoelectricity |
| CN207442719U (en) * | 2017-11-27 | 2018-06-01 | 浙江三花智能控制股份有限公司 | Energy capture sensor, vibration generating device and vehicle-mounted detecting system |
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