CN202385032U - Cantilever piezoelectric generator with adjustable fundamental frequency resonant frequency - Google Patents
Cantilever piezoelectric generator with adjustable fundamental frequency resonant frequency Download PDFInfo
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- CN202385032U CN202385032U CN2011205538667U CN201120553866U CN202385032U CN 202385032 U CN202385032 U CN 202385032U CN 2011205538667 U CN2011205538667 U CN 2011205538667U CN 201120553866 U CN201120553866 U CN 201120553866U CN 202385032 U CN202385032 U CN 202385032U
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- piezoelectric generator
- cantilever
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Abstract
The utility model relates to a piezoelectric generator, in particular to a cantilever piezoelectric generator with adjustable fundamental frequency resonant frequency. The cantilever piezoelectric generator comprises a clamping device, a piezoelectric layer, a bonding layer, an elastic layer, a U-shaped groove and a mass block, wherein the piezoelectric layer and the elastic layer construct a cantilever beam of the cantilever piezoelectric generator; the fixed end of the cantilever beam is inserted into the clamping device; the U-shaped groove is fixed at the free end of the cantilever beam; and the mass block is fixed in the U-shaped groove through a bolt in the center of the U-shaped groove. The effective stiffness of the cantilever beam is changed by sliding the mass block horizontally, so that the fundamental frequency resonant frequency of the piezoelectric generator is adjusted. Due to the adoption of cantilever piezoelectric generator with adjustable fundamental frequency resonant frequency, energy generated by environmental vibration of different vibration frequencies can be collected, so that the application rage of the piezoelectric vibration generation is enlarged.
Description
Technical field
The utility model relates to a kind of piezoelectric generator, the cantilever style piezoelectric generator that especially a kind of fundamental resonance frequency is adjustable.
Background technology
Along with the arrival of information age, wireless senser has obtained using widely in every profession and trade.Existing wireless senser mainly relies on the battery mode to supply power, because battery capacity is limited, in order to keep the operate as normal of transducer, therefore needs the periodic replacement battery.Continue, supply reliably the focus that electric energy becomes people's research forever how for transducer.The vibrational energy that is richly stored with in the environment, highway, bridge, building and various electric equipments etc. all can produce vibration.Utilize the piezoelectric vibration power generation machine of piezoelectric effect, after can the vibrational energy in the environment being collected, being converted into electric energy, for transducer is supplied power, thus for transducer provide stable, reliably, the supply of electrical energy that continues forever.Become the focus of people's research based on the piezoelectric vibration power generation machine art of piezoelectricity mode.Existing piezoelectric generator all is the piezoelectric vibrator that adopts cantilever style, and mass is fixed on the free end of cantilever beam, and the vibration frequency of piezoelectric vibrator is unadjustable, therefore can only the extraneous vibration of a certain frequency be absorbed, and range of application is narrower.
The utility model content
The utility model technical problem to be solved is to the deficiency of above-mentioned background technology, provides a kind of fundamental resonance frequency adjustable cantilever style piezoelectric generator.
The utility model is for realizing that above-mentioned utility model purpose adopts following technical scheme:
The cantilever style piezoelectric generator that a kind of fundamental resonance frequency is adjustable comprises: single-chip cantilever style piezoelectric generator, U type groove, mass; Wherein: U type groove is fixed on the free end of single-chip cantilever style piezoelectric generator cantilever beam, in the U type that the is bolted to groove of said mass through U type groove center place.
In the cantilever style piezoelectric generator that said fundamental resonance frequency is adjustable, the length of said U type groove is identical with the length of mass, and the quality of U type groove is much smaller than the quality of mass.
In the cantilever style piezoelectric generator that said fundamental resonance frequency is adjustable; Said single-chip cantilever style piezoelectric generator comprises elastic layer; And the piezoelectric layer that is arranged on the elastic layer upper surface, wherein the width of piezoelectric layer and length respectively with the width and the equal in length of elastic layer.
The cantilever style piezoelectric generator that a kind of fundamental resonance frequency is adjustable comprises: twin lamella cantilever style piezoelectric generator, U type groove, mass; Wherein: U type groove is fixed on the free end of twin lamella cantilever style piezoelectric generator cantilever beam, in the U type that the is bolted to groove of said mass through U type groove center place.
In the cantilever style piezoelectric generator that said fundamental resonance frequency is adjustable, the length of said U type groove is identical with the length of mass, and the quality of U type groove is much smaller than the quality of mass.
In the cantilever style piezoelectric generator that said fundamental resonance frequency is adjustable; Said twin lamella cantilever style piezoelectric generator comprises elastic layer; And the piezoelectric layer that is separately positioned on the upper and lower surface of elastic layer, wherein the width of piezoelectric layer and length respectively with the width and the equal in length of elastic layer.
The utility model adopts technique scheme, has following beneficial effect: realized the ambient vibration of different vibration frequencies is carried out collection of energy, improved the range of application of piezoelectric vibration power generation machine.
Description of drawings
Fig. 1 is the threedimensional model view of fundamental resonance frequency adjustable double wafer cantilever style piezoelectric generator.
Fig. 2 is the structure chart of fundamental resonance frequency adjustable double wafer cantilever style piezoelectric generator among the embodiment.
Fig. 3 is the graph of a relation of the displacement and the piezoelectric vibration power generation machine vibration frequency of mass.
Label declaration among the figure: 1 is elastic layer, and 2 and 13 is piezoelectric layer, and 3 and 14 is tack coat, and 4 and 5 is lead, and 6 is mass, 7 and 8 electrodes, and 9 is clamping device, and 10 is pedestal, and 11 is U type groove, and 12 is bolt.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to utility model:
The twin lamella cantilever style piezoelectric generator model that fundamental resonance frequency as shown in Figure 1 is adjustable comprises: clamping device 9, elastic layer 1; Piezoelectric layer 2 and 3, U type groove 11, mass 6; Elastic layer 1 and piezoelectric layer 2 and 13 constitute the cantilever beam of the adjustable cantilever style piezoelectric generator of fundamental resonance frequency; The part that elastic layer 1 exceeds piezoelectric layer 2 and 3 is inserted in the clamping device 9, and U type groove 11 is fixed on the free end of cantilever beam, and mass 6 is fixed in the bolt 12 through the bolt 12 of U type groove 11 centers.Mass 6 is identical with U type slot length.Mass 6 in U type groove 11 slidably distance be to be the length of 1/2nd masses about the center with bolt 12.
Fig. 2 is the adjustable twin lamella cantilever style piezoelectric generator structure chart of the described fundamental resonance frequency of specific embodiment; Piezoelectric layer 2 and 13 respectively through tack coat 3 with 14 and the upper and lower surfaces of elastic layer 1 bond; Piezoelectric layer 2 and 13 upper and lower surfaces are coated with electrode 7 and 8 respectively, electrode 7 with 8 through lead 4 with 5 with have the interface circuit of rectification and be connected with the energy storage.Clamping device 9 is fixed on the pedestal 10, and when pedestal vibrated with external environment, piezoelectric layer under the effect of inertia force deformation will take place, thereby has realized the conversion of mechanical energy to electric energy.Piezoelectric layer 1 is a stainless steel, and the material of piezoelectric layer is a PZT-5H type piezoelectric ceramic, and U type groove 11 is the material of aluminium alloy, and mass 6 is high-density metal materials such as lead.Piezoelectric layer 2 is identical with elastic layer 1 with 13 width.
Direct piezoelectric effect principle according to piezoelectric ceramic:
Can know that by formula (1) when cantilever beam is receiving under the effect of z direction inertia force, piezoelectric layer can produce in the x direction and stretch and compression, and at z to forming coupled electric field.Wherein: s
11, ε
33And d
31Be respectively softness factor, dielectric constant and the piezoelectric constant of piezoelectric, D
3Be electric displacement, E
3Be electric field strength, S
1And σ
1Be respectively strain and stress.
The fundamental resonance frequency that can be known cantilever beam by the correlation theory of Elasticity is:
M is the effective mass of cantilever beam in the formula, m=m
M+ 0.236mb, m
MBe the quality of mass, m
bBe the quality of cantilever beam, K is the effective rigidity of cantilever beam,
K＝3E
pI/L
e 3(3)
E in the formula
pBe the modulus of elasticity of piezoelectric layer, L
eBe the effective length of cantilever beam, I is the torque inertia of cantilever beam, I=(η wh
m 3/ 12) (wh+2
p 3/ 12+wh
p(h
p+ h
m)
2), w is the deck-siding of cantilever beam, η=E
b/ E
p, E
bModulus of elasticity for elastic layer.Can know L by Fig. 1
eBe the barycenter of mass distance to the cantilever beam stiff end, when mass when the translation of U type trough inner water is moving, L
eSize be changed, can know L by formula (2), (3)
eChange will cause the cantilever beam fundamental resonance frequency to change.
As shown in Figure 3: cantilever beam width 7mm, piezoelectric layer thickness 0.3mm, elastic layer thickness 0.3mm; The length of mass is 18mm; Quality is 10g, and piezoelectric layer and elastic layer length are the adjustable cantilever style piezoelectric generator of the fundamental resonance frequency of 35mm, along with mass moves in U type groove; The fundamental vibration frequency of piezoelectric vibration power generation machine changes in the scope of 70Hz～210Hz, thereby has realized the adjusting to piezoelectric vibration power generation machine fundamental resonance frequency.
It is thus clear that; Cantilever style piezoelectric vibration power generation machine in the utility model comes through changing the effective length of cantilever beam through move left and right mass on the horizontal direction; Thereby change the effective rigidity of cantilever beam, and then realize regulating the fundamental resonance frequency of piezoelectric vibration power generation machine.Therefore the adjustable cantilever style piezoelectric generator of said fundamental resonance frequency can be realized the ambient vibration of different vibration frequencies is carried out collection of energy, has improved the range of application of piezoelectric vibration power generation machine.
Claims (6)
1. the cantilever style piezoelectric generator that fundamental resonance frequency is adjustable is characterized in that comprising: single-chip cantilever style piezoelectric generator, U type groove, mass; Wherein: U type groove is fixed on the free end of single-chip cantilever style piezoelectric generator cantilever beam, in the U type that the is bolted to groove of said mass through U type groove center place.
2. the cantilever style piezoelectric generator that fundamental resonance frequency according to claim 1 is adjustable is characterized in that: the length of said U type groove is identical with the length of mass, and the quality of U type groove is much smaller than the quality of mass.
3. the cantilever style piezoelectric generator that fundamental resonance frequency according to claim 1 is adjustable; It is characterized in that: said single-chip cantilever style piezoelectric generator comprises elastic layer; And the piezoelectric layer that is arranged on the elastic layer upper surface, wherein the width of piezoelectric layer and length respectively with the width and the equal in length of elastic layer.
4. the cantilever style piezoelectric generator that fundamental resonance frequency is adjustable is characterized in that comprising: twin lamella cantilever style piezoelectric generator, U type groove, mass; Wherein: U type groove is fixed on the free end of twin lamella cantilever style piezoelectric generator cantilever beam, in the U type that the is bolted to groove of said mass through U type groove center place.
5. the cantilever style piezoelectric generator that fundamental resonance frequency according to claim 4 is adjustable is characterized in that the length of said U type groove is identical with the length of mass, and the quality of U type groove is much smaller than the quality of mass.
6. the cantilever style piezoelectric generator that fundamental resonance frequency according to claim 4 is adjustable; It is characterized in that said twin lamella cantilever style piezoelectric generator comprises elastic layer; And the piezoelectric layer that is separately positioned on the upper and lower surface of elastic layer, wherein the width of piezoelectric layer and length respectively with the width and the equal in length of elastic layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011205538667U CN202385032U (en) | 2011-12-27 | 2011-12-27 | Cantilever piezoelectric generator with adjustable fundamental frequency resonant frequency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205538667U CN202385032U (en) | 2011-12-27 | 2011-12-27 | Cantilever piezoelectric generator with adjustable fundamental frequency resonant frequency |
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| CN202385032U true CN202385032U (en) | 2012-08-15 |
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| CN2011205538667U Expired - Fee Related CN202385032U (en) | 2011-12-27 | 2011-12-27 | Cantilever piezoelectric generator with adjustable fundamental frequency resonant frequency |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412757A (en) * | 2011-12-27 | 2012-04-11 | 东南大学 | Cantilever-type piezoelectric generator with adjustable base frequency resonant frequency |
| CN102983779A (en) * | 2012-11-01 | 2013-03-20 | 西安交通大学 | Piezoelectric vibration energy capture device of magnetic coupling |
| CN103248266A (en) * | 2013-05-07 | 2013-08-14 | 天津大学 | Combined-type vibrational energy acquisition system |
| CN105157938A (en) * | 2015-05-04 | 2015-12-16 | 南京理工大学 | Device and method for adjusting modal frequency of flexible cantilever |
| CN106655889A (en) * | 2017-03-21 | 2017-05-10 | 山东大学 | Adaptive frequency conversion piezoelectric energy collector structure |
| CN107427110A (en) * | 2015-01-07 | 2017-12-01 | 卡地亚国际股份公司 | For clock and watch or the mosaic system of jewelry article |
| CN108713260A (en) * | 2016-03-01 | 2018-10-26 | 维蒙股份公司 | Piezoelectric harvester system with Composition spacer |
| CN109194193A (en) * | 2018-08-24 | 2019-01-11 | 重庆大学 | The adaptive piezoelectric energy collector of bridge-type |
| CN112595408A (en) * | 2020-12-10 | 2021-04-02 | 四川度飞科技有限责任公司 | Novel dynamic resonance sensing device |
-
2011
- 2011-12-27 CN CN2011205538667U patent/CN202385032U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102412757A (en) * | 2011-12-27 | 2012-04-11 | 东南大学 | Cantilever-type piezoelectric generator with adjustable base frequency resonant frequency |
| CN102983779A (en) * | 2012-11-01 | 2013-03-20 | 西安交通大学 | Piezoelectric vibration energy capture device of magnetic coupling |
| CN102983779B (en) * | 2012-11-01 | 2015-02-25 | 西安交通大学 | Piezoelectric vibration energy capture device of magnetic coupling |
| CN103248266A (en) * | 2013-05-07 | 2013-08-14 | 天津大学 | Combined-type vibrational energy acquisition system |
| CN107427110A (en) * | 2015-01-07 | 2017-12-01 | 卡地亚国际股份公司 | For clock and watch or the mosaic system of jewelry article |
| CN107427110B (en) * | 2015-01-07 | 2019-05-10 | 卡地亚国际股份公司 | For clock and watch or the mosaic system of jewelry article |
| CN105157938A (en) * | 2015-05-04 | 2015-12-16 | 南京理工大学 | Device and method for adjusting modal frequency of flexible cantilever |
| CN105157938B (en) * | 2015-05-04 | 2018-12-14 | 南京理工大学 | The device and method for adjusting flexible cantilever beam modal frequency |
| CN108713260A (en) * | 2016-03-01 | 2018-10-26 | 维蒙股份公司 | Piezoelectric harvester system with Composition spacer |
| CN108713260B (en) * | 2016-03-01 | 2023-03-24 | 卡爱达克有限公司 | Piezoelectric energy harvester system with composite gasket |
| CN106655889A (en) * | 2017-03-21 | 2017-05-10 | 山东大学 | Adaptive frequency conversion piezoelectric energy collector structure |
| CN109194193A (en) * | 2018-08-24 | 2019-01-11 | 重庆大学 | The adaptive piezoelectric energy collector of bridge-type |
| CN112595408A (en) * | 2020-12-10 | 2021-04-02 | 四川度飞科技有限责任公司 | Novel dynamic resonance sensing device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120815 Termination date: 20141227 |
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| EXPY | Termination of patent right or utility model |