CN101741278A - Dynamic vibration absorber-based device for collecting piezoelectric vibration energy - Google Patents
Dynamic vibration absorber-based device for collecting piezoelectric vibration energy Download PDFInfo
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Abstract
The invention relates to a dynamic vibration absorber-based device for collecting piezoelectric vibration energy, and belongs to the technical field of energy utilization. The device comprises a piezoelectric element, a cover plate, a dynamic vibration absorber and an energy collecting circuit, wherein the cover plate is fixed on the piezoelectric element and is connected with the dynamic vibration absorber; and the energy collecting circuit is connected with the piezoelectric element. The piezoelectric element can be arranged on the surface of an external vibrating element conveniently to collect the small-amplitude vibration energy without being embedded in the external vibrating element or large amplitude; and the working frequency of the piezoelectric element can be designed in a higher frequency domain so as to realize the easily-applied and efficient collection of the vibration energy.
Description
Technical field
What the present invention relates to is the device in a kind of energy utilization technology field, in particular a kind of device for collecting piezoelectric vibration energy based on dynamic vibration absorber.
Background technology
There is individual common feature in radio sensing network, the micro-electro-mechanical systems micro electromechanical systems such as individual mobile device that unify: energy consumption is very low, from several μ W to hundreds of mW, but require service time very long, very crucial is because the limiting them and generally can not carry out the energy supply with power line of service condition, there are shortcomings such as volume is big, the life-span is short in present battery-powered mode, adopt solar energy, thermal gradient homenergic to power and then need carry out in the environment that corresponding sunlight or thermal gradient are arranged, this has limited their application.
The energy that has abundant vibration mode in the environment, these collection of energy are got up becomes a kind of good selection for the power supply of above-mentioned micro electromechanical system.Piezoelectric is a kind of intellectual material that can realize that electromechanical energy exchanges, just can produce electric energy endlessly when being subjected to alternate stress, and it can be an electric energy with the power conversion of vibration.Piezoelectric commonly used now has piezoelectric ceramic and piezopolymer and their compound etc., and wherein the electromechanical conversion efficiency of piezoelectric ceramic is higher, is the preferred material that carries out collection of energy.(piezoelectric constant is d to the commonly used generating mode of vibration of piezoelectric ceramic perpendicular to the telescopic mould of length in order to adopt electric field
31), electric field is parallel to the flexible mould of thickness of direction of wave travel (piezoelectric constant is d
33) and electric field is parallel to the thickness shear mode of direction of wave travel, and (piezoelectric constant is d
15), wherein: d
33Be about d
312～3 times, and d
15Be about d
313～4 times.Adopt suitable mode of operation can improve the efficient of the electromechanics conversion of piezoelectric ceramic according to the application scenario.Will make piezoelectric produce many electric weight under specific mode of operation will apply big stress or make piezoelectric produce big deformation, because the distortion of vibrating elements can be very not big, thereby can not lean on the flexural deformation of vibrating elements to drive piezoelectric material to generate electricity.Piezoelectric Cantilever Beams often is used to carry out vibrational energy and collects, but it generally only is suitable for the following vibration of 100Hz.Piezoelectric stack is that the multi-disc piezoelectric patches is stacked together and carry out serial or parallel connection or part series connection, part structure in parallel on circuit, and it mainly utilizes the higher d of piezoelectric constant
33Series connection can improve output voltage on the piezoelectric patches circuit, parallel connection can improve output current, can carry out the series and parallel design to the requirement of electric current and voltage according to actual collecting circuit, under onesize external force effect, for onesize piezoelectric patches, the voluminous more living electric weight of stacked sheet number is just big more, but the sheet number has too much increased volume and cost, need weigh between actual power consumption demand, application space requirement and deployment cost require.By the connection in series-parallel on the piezoelectric patches circuit in the piezoelectric stack is designed, the internal driving when making it make piezoelectric material to generate electricity when increasing piezoelectric length and lifting surface area does not increase or increases very little, so that the impedance matching of realization and external circuit.At present, the method for carrying out collection of energy with piezoelectric stack mainly is that it is embedded in the vibrating elements, make the pressure (drawing) that its two sides is equal to thus power produces electric energy.If just piezoelectric stack is pasted on the vibrating elements surface, the length of PZT (piezoelectric transducer) will equal quarter-wave multiple, this can make piezoelectric size under lower frequency long, such as at the nearly 21cm of 5kHz lower piezoelectric material require, thereby this mode only is applicable to tens kilo hertzs to up to a hundred kilo hertzs frequency range.Additional certain quality piece is pasted on and can constitutes the spring proton structure with certain resonance frequency on the vibrating elements on piezoelectric stack, energy conversion efficiency is very high near this resonance frequency, but because piezoelectric ceramic very hard (rigidity height), just need up to a hundred kilograms mass for the vibration of hundreds of hertz, more be difficult to be applied to the following frequency range of 50Hz, and piezoelectric ceramic be subjected to bigger static compression force after piezoelectric modulus have certain decline, make electromechanical conversion efficiency become very low, thereby this structure also is difficult to use.
Find through retrieval prior art, Chinese invention patent notification number: CN1258866, title: piezoelectric generating apparatus, this device comprises the piezoelectric ceramic plate that the piezo ceramic element by two plate shapes forms, they be layering and be engaged with each other with contrapolarization, wherein by the one or both sides of patting piezoelectric ceramic plate with hard beater, thereby the bending vibration that is activated in the piezoelectric ceramic plate produces.Because it is of short duration that beater is once patted the time of generating, the beating that needs beater to continue could produce stable electric energy, but situation, particularly beater that it generally only is suitable for low-frequency vibration need bigger amplitude ability starting of oscillation, and these have all limited its application.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of device for collecting piezoelectric vibration energy based on dynamic vibration absorber is provided, adopt dynamic absorber structure commonly used in the vibration control, it is additional on the piezoelectric, utilize the strong resonance effect of dynamic vibration absorber to make piezoelectric obtain enough stress, thereby under the small size vibration of vibrating elements, produce more electric energy.Because the resonance frequency of dynamic vibration absorber can design in the frequency domain from several hertz to several KHz, thereby the operating frequency of energy collecting device can be selected in the frequency domain of broad.In addition, can realize the energy collecting device of small size, little quality by design, and the structure that adopts piezoelectric stack and piezoelectric cantilever simultaneously can be widened the working band of energy collecting device, improve the energy density of energy collecting device, thereby obtain to be easy to use, energy gathering apparatus efficiently.
The present invention is achieved by the following technical solutions, the present invention includes: piezoelectric element, cover plate, dynamic vibration absorber and energy acquisition circuit, wherein: securing cover plate on the piezoelectric element, cover plate links to each other with dynamic vibration absorber, and the energy acquisition circuit links to each other with piezoelectric element.
Described dynamic vibration absorber comprises: mass and flexible member, and wherein: flexible member links to each other with cover plate, and mass links to each other with flexible member.
The damping ratio of described flexible member is less than 0.3.
Described piezoelectric element is piezoelectric stack or piezoelectricity overarm arm configuration.
Described piezoelectric stack adopts flexible mould of thickness or thickness shear mode.
Described collection of energy circuit adopts full-bridge rectification filter circuit.
The course of work of the present invention: piezoelectric element is subjected to the excitation of extraneous vibration element to produce forced vibration, in the working band of energy acquisition circuit, because the damping ratio of flexible member is less than 0.3, thereby dynamic vibration absorber generation strong resonance effect drive pressure electric device produces the electric current of alternation, alternating current has obtained than galvanic current behind energy acquisition circuit rectifying and wave-filtering, thus store or directly utilize.
The present invention has the following advantages compared to existing technology: owing to adopted the dynamic vibration absorber structure, piezoelectric element does not need to embed the inside of extraneous vibration element among the present invention, do not need bigger amplitude yet, collect the vibrational energy of little amplitude on the surface that can be arranged in vibrating elements easily, and the operating frequency of this device can be designed in higher frequency domain realization is easy to use, the collection of vibrational energy efficiently.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of embodiment 2;
Fig. 3 is the structural representation of embodiment 3;
Fig. 4 is the structural representation of embodiment 4;
Fig. 5 is the structural representation of embodiment 5.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: vibrating elements 1, piezoelectric element 2, cover plate 3, dynamic vibration absorber 4 and energy acquisition circuit 5, wherein: vibrating elements 1 links to each other with piezoelectric element 2, securing cover plate 3 on the piezoelectric element 2, cover plate 3 links to each other with dynamic vibration absorber 4, and energy acquisition circuit 5 links to each other with piezoelectric element 2.
Described dynamic vibration absorber 4 comprises: mass 6 and flexible member 7, and wherein: flexible member 7 links to each other with cover plate 3, and mass 6 links to each other with flexible member 7.
The damping ratio of described flexible member 7 is less than 0.3.
The piezoelectric element 2 of present embodiment adopts the flexible mould of thickness, and its piezoelectric constant is d
33
Described energy acquisition circuit 5 is full-bridge rectification filter circuits, comprising: rectifier bridge 8, filter capacitor 9 and load 10, and wherein: piezoelectric element 2 links to each other with rectifier bridge 8, and rectifier bridge 8 links to each other with filter capacitor 9, load 10 and filter capacitor 9 parallel connections.
The effect of cover plate 3 is whole surfaces that protection piezoelectric element 2 and the power that makes flexible member 7 can be evenly distributed to piezoelectric element 2.Because being subjected to stretch, piezoelectric is easy to damage, and the intensity by compression the time is higher, thereby when be applied in the vibration strong occasion need carry out pretension to piezoelectric stack, can adopt two structure of cover plate, promptly all arrange cover plate 3 on the piezoelectric stack both sides, pass piezoelectric with screw and carry out pretension, just need perforation like this in the middle of the piezoelectric.
The energy that the vibrational system that vibrating elements 1, piezoelectric element 2 and dynamic vibration absorber 4 are formed produces when resonance takes place is maximum, and this moment, piezoelectric element 2 was stressed greater than outside exciting force; The piezoelectric element 2 stressed exciting forces that equal when excited frequency equals the natural frequency of dynamic vibration absorber 4, the energy that this moment, whole device produced is also more; When the natural frequency of dynamic vibration absorber 4 equaled the natural frequency of vibrating elements 1, the resonance bands of this device was the wideest, and the mass ratio that increases mass 6 and vibrating elements 1 this moment can be widened the resonance bands of this device.
As shown in Figure 2, the dynamic vibration absorber 4 of present embodiment is the stack of two flexible members 7 and mass 6, has constituted double-deck dynamic absorber structure.Dynamic vibration absorber 4 comprises first spring 11, first mass 12, second spring 13 and second mass 14, and wherein: first spring 11 links to each other with cover plate 3, and first spring 11, first mass 12, second spring 13 link to each other successively with second mass 14.Be that flexible member 7 comprises: first spring 11 and second spring 13, mass 6 comprises: first mass 12 and second mass 14.
Other execution modes of present embodiment are identical with embodiment 1.
This embodiment adopts two springs and mass 6 to form the Three Degree Of Freedom vibrational system with vibrating elements 1, has increased formant number and resonance bands width, thereby has widened the bandwidth of operation of whole device.
As shown in Figure 3, the flexible member 7 of present embodiment comprises: first support 15, second support 16, the 3rd spring 17 and first lever 18, mass 6 comprises: the 3rd mass 19 and the 4th mass 20, wherein: first support 15 and the 4th mass 20 lay respectively at the two ends of first lever 18, second support 16 links to each other with cover plate 3 with first lever 18 respectively, first support 15 links to each other with the 3rd mass 19, and the 3rd mass 19 links to each other with the 3rd spring 17, and the 3rd spring 17 links to each other with cover plate 3.
Other execution modes of present embodiment are identical with embodiment 1.
This structure is fit to be applied in to the conditional occasion of weight.
As shown in Figure 4, the flexible member 7 of present embodiment comprises: the 3rd support 21, the 4th support 22 and overarm arm 23, wherein: an end and the 4th support 22 of overarm arm 23 are fixedly linked, the other end is provided with mass 6, the 4th support 22 and cover plate 3 are fixedly linked, the 3rd support 21 and overarm arm 23 flexibly connect, and the both sides of overarm arm 23 adhere to piezoelectric patches 24 respectively, and the damping ratio of whole elastic element 7 is less than 0.3.
Starting of oscillation element 1 is provided with vertical sidewall 25 in the present embodiment, adhere to first piezoelectric stack 26 on the sidewall 25, first piezoelectric stack 26 is provided with cover plate 3, piezoelectric patches 24 and the piezoelectricity overarm arm configuration of arm 23 compositions of hanging oneself from a beam and the piezoelectric element 2 that first piezoelectric stack 26 has constituted present embodiment.One end of the 3rd support 21 and overarm arm 23 are movably connected, and the other end and sidewall 25 are fixedly linked.
The contact-making surface of the sidewall 25 and first piezoelectric stack 26 is provided with the angle of 10～15 degree, and this makes the piezoelectric stack 26 of winning mainly be parallel to the stretching and the compression stress of polarized electric field.
Being provided with two rectifier bridges 8 in the energy acquisition circuit 5 links to each other with first piezoelectric stack 26 with piezoelectric patches 24 respectively, the alternating current that piezoelectricity is exported becomes the direct current of unidirectional output, reduced the couplings of two kinds of structure output electric weight, the numerical value of appropriate design filter capacitor 9 can provide more stable voltage to load 10.
Other execution modes of present embodiment are identical with embodiment 1.
In the present embodiment: when vibrating elements 1 vibration, dynamic vibration absorber 4 just can resonate at certain band frequency, because cantilever beam 23 is fixing by the 3rd support 21 and the 4th support 22, so just, can on two piezoelectric stacks, produce the stress of alternation, and because the free partial-length of cantilever beam 23 is longer, the stress that mass 6 up-down vibration produce can produce the lever amplification on the 4th support 22, this will increase the generating capacity of piezoelectric stack greatly.The length direction of first piezoelectric stack 26 is arranged along the Width of cantilever beam 23, can reduce the length of cantilever beam 23 standing parts like this, increases the amplification of lever.In fact, owing to adopt cantilever beam 23, the resonance frequency of dynamic vibration absorber 4 is more, can carry out vibrational energy collection efficiently in a plurality of frequency ranges.
As shown in Figure 5, present embodiment adopts the big (d of piezoelectric constant
15) thickness shear mode, second piezoelectric stack 27 is pasted on upright side walls 25, the contact-making surface of the sidewall 25 and second piezoelectric stack 27 does not have angle.In the present embodiment, flexible member 7 comprises: cantilever beam 23, the 5th support 28 and the 6th support 29, and wherein: the 5th support 28 1 ends are fixed on the sidewall 25, and an end links to each other with cantilever beam 23, the 6th support 29 1 ends are fixed on the cover plate 3, and an end links to each other with cantilever beam 23.The both sides of cantilever beam 23 are provided with piezoelectric patches 24.
Other execution modes of present embodiment are identical with embodiment 4.
Claims (4)
1. device for collecting piezoelectric vibration energy based on dynamic vibration absorber, comprise: piezoelectric element, energy acquisition circuit and cover plate, it is characterized in that, also comprise: dynamic vibration absorber, wherein: securing cover plate on the piezoelectric element, cover plate links to each other with dynamic vibration absorber, the energy acquisition circuit links to each other with piezoelectric element, described dynamic vibration absorber comprises: mass and damping ratio are less than 0.3 flexible member, and wherein: flexible member links to each other with cover plate, and mass links to each other with flexible member.
2. the device for collecting piezoelectric vibration energy based on dynamic vibration absorber according to claim 1 is characterized in that, described piezoelectric element is piezoelectric stack or piezoelectricity overarm arm configuration.
3. the device for collecting piezoelectric vibration energy based on dynamic vibration absorber according to claim 2 is characterized in that, described piezoelectric stack adopts flexible mould of thickness or thickness shear mode.
4. the device for collecting piezoelectric vibration energy based on dynamic vibration absorber according to claim 1 is characterized in that, described collection of energy circuit is a full-bridge rectification filter circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210149507.4A CN102664555B (en) | 2010-03-24 | 2010-03-24 | A kind of Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector |
| CN2010101305193A CN101741278B (en) | 2010-03-24 | 2010-03-24 | Dynamic vibration absorber-based device for collecting piezoelectric vibration energy |
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| CN2010101305193A CN101741278B (en) | 2010-03-24 | 2010-03-24 | Dynamic vibration absorber-based device for collecting piezoelectric vibration energy |
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| CN201210149507.4A Division CN102664555B (en) | 2010-03-24 | 2010-03-24 | A kind of Multi-frequency-bandpiezoelectric piezoelectric vibration energy collector |
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| CN101741278A true CN101741278A (en) | 2010-06-16 |
| CN101741278B CN101741278B (en) | 2012-09-05 |
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Cited By (17)
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| CN102427314A (en) * | 2011-11-02 | 2012-04-25 | 浙江师范大学 | Elevator rope head buffering power generation device |
| CN102647112A (en) * | 2012-05-07 | 2012-08-22 | 哈尔滨工业大学 | Rotary piezoelectric power generator |
| CN103023377A (en) * | 2012-12-24 | 2013-04-03 | 成都理工大学 | Piezoelectric and electromagnetic hybrid variable-frequency micro-power generation assembly and method for same |
| CN104104133A (en) * | 2014-06-21 | 2014-10-15 | 浙江师范大学 | Self-adaptive piezoelectric energy high-efficiency conversion method |
| CN104521130A (en) * | 2012-08-07 | 2015-04-15 | 株式会社村田制作所 | Piezoelectric power generating apparatus |
| CN106712575A (en) * | 2016-11-17 | 2017-05-24 | 上海交通大学 | Amplitude amplified and superposed vibration energy acquisition device |
| CN107623463A (en) * | 2017-10-24 | 2018-01-23 | 安徽理工大学 | Bistable state piezoelectric energy recovery device |
| CN108828361A (en) * | 2018-06-27 | 2018-11-16 | 哈尔滨工业大学 | A kind of piezoelectric energy harvesters test device based on dynamic vibration absorber |
| CN109281417A (en) * | 2018-11-13 | 2019-01-29 | 广州广日电梯工业有限公司 | A kind of elevator self energizing piezoelectricity shock mitigation system and method |
| WO2019041758A1 (en) * | 2017-08-28 | 2019-03-07 | 北京工业大学 | Piezoelectric electromagnetic composite energy harvester based on parallel mechanism |
| CN111245293A (en) * | 2020-01-19 | 2020-06-05 | 上海电力大学 | Elastic vibration type wind power generation device |
| CN111641351A (en) * | 2020-05-18 | 2020-09-08 | 扬州大学 | Vortex vibration piezoelectric power generation device with broadband energy collection function |
| CN111664209A (en) * | 2020-07-13 | 2020-09-15 | 西南交通大学 | Vibration absorber, floating plate rail and vibration absorbing method |
| CN111934581A (en) * | 2020-06-18 | 2020-11-13 | 重庆大学 | Energy recovery device utilizing piezoelectric stack to capture energy |
| CN112019088A (en) * | 2020-09-10 | 2020-12-01 | 重庆大学 | Paper folding coupling broadband nonlinear piezoelectric vibration power generation device |
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| CN113131789A (en) * | 2021-04-22 | 2021-07-16 | 长春工业大学 | Multimode road piezoelectric power generation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102427314A (en) * | 2011-11-02 | 2012-04-25 | 浙江师范大学 | Elevator rope head buffering power generation device |
| CN102647112A (en) * | 2012-05-07 | 2012-08-22 | 哈尔滨工业大学 | Rotary piezoelectric power generator |
| CN104521130A (en) * | 2012-08-07 | 2015-04-15 | 株式会社村田制作所 | Piezoelectric power generating apparatus |
| DE112013003943B4 (en) * | 2012-08-07 | 2021-01-14 | Murata Manufacturing Co., Ltd. | Piezoelectric power generating device |
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| CN103023377A (en) * | 2012-12-24 | 2013-04-03 | 成都理工大学 | Piezoelectric and electromagnetic hybrid variable-frequency micro-power generation assembly and method for same |
| CN103023377B (en) * | 2012-12-24 | 2017-05-03 | 成都理工大学 | Piezoelectric and electromagnetic hybrid variable-frequency micro-power generation assembly and method for same |
| CN104104133A (en) * | 2014-06-21 | 2014-10-15 | 浙江师范大学 | Self-adaptive piezoelectric energy high-efficiency conversion method |
| CN106712575A (en) * | 2016-11-17 | 2017-05-24 | 上海交通大学 | Amplitude amplified and superposed vibration energy acquisition device |
| CN106712575B (en) * | 2016-11-17 | 2018-05-25 | 上海交通大学 | Amplitude amplification superpositing vibration electricity energy harvester |
| WO2019041758A1 (en) * | 2017-08-28 | 2019-03-07 | 北京工业大学 | Piezoelectric electromagnetic composite energy harvester based on parallel mechanism |
| US11463025B2 (en) | 2017-08-28 | 2022-10-04 | Tiangong University | Piezoelectric electromagnetic composite energy harvester based on parallel mechanism |
| CN107623463A (en) * | 2017-10-24 | 2018-01-23 | 安徽理工大学 | Bistable state piezoelectric energy recovery device |
| CN108828361A (en) * | 2018-06-27 | 2018-11-16 | 哈尔滨工业大学 | A kind of piezoelectric energy harvesters test device based on dynamic vibration absorber |
| CN108828361B (en) * | 2018-06-27 | 2020-07-07 | 哈尔滨工业大学 | Piezoelectric energy collector testing device based on dynamic vibration absorber |
| CN109281417A (en) * | 2018-11-13 | 2019-01-29 | 广州广日电梯工业有限公司 | A kind of elevator self energizing piezoelectricity shock mitigation system and method |
| CN109281417B (en) * | 2018-11-13 | 2024-03-26 | 广州广日电梯工业有限公司 | Self-powered piezoelectric damping system and method for elevator |
| CN111245293A (en) * | 2020-01-19 | 2020-06-05 | 上海电力大学 | Elastic vibration type wind power generation device |
| CN111641351A (en) * | 2020-05-18 | 2020-09-08 | 扬州大学 | Vortex vibration piezoelectric power generation device with broadband energy collection function |
| CN111641351B (en) * | 2020-05-18 | 2022-03-25 | 扬州大学 | Vortex vibration piezoelectric power generation device with broadband energy collection function |
| CN111934581A (en) * | 2020-06-18 | 2020-11-13 | 重庆大学 | Energy recovery device utilizing piezoelectric stack to capture energy |
| CN111664209A (en) * | 2020-07-13 | 2020-09-15 | 西南交通大学 | Vibration absorber, floating plate rail and vibration absorbing method |
| CN112019088A (en) * | 2020-09-10 | 2020-12-01 | 重庆大学 | Paper folding coupling broadband nonlinear piezoelectric vibration power generation device |
| CN112019088B (en) * | 2020-09-10 | 2024-03-15 | 重庆大学 | Paper folding coupling broadband nonlinear piezoelectric vibration power generation device |
| CN112532108A (en) * | 2020-12-07 | 2021-03-19 | 上海大学 | Vibration energy collecting device based on piezoelectric stack and electromagnetic induction |
| CN112532108B (en) * | 2020-12-07 | 2022-02-22 | 上海大学 | Vibration energy collecting device based on piezoelectric stack and electromagnetic induction |
| CN113131789A (en) * | 2021-04-22 | 2021-07-16 | 长春工业大学 | Multimode road piezoelectric power generation device |
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