CN104242725B - Two-level vibrating type broadband energy harvester - Google Patents
Two-level vibrating type broadband energy harvester Download PDFInfo
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- CN104242725B CN104242725B CN201310234498.3A CN201310234498A CN104242725B CN 104242725 B CN104242725 B CN 104242725B CN 201310234498 A CN201310234498 A CN 201310234498A CN 104242725 B CN104242725 B CN 104242725B
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Abstract
The invention provides a two-level vibrating type broadband energy harvester. The two-level vibrating type broadband energy harvester at least comprises a first-level low-frequency vibrator and a second-level high-frequency vibrator. The first-level low-frequency vibrator is used for inducting vibration of external environment. The second-level high-frequency vibrator is driven by repulsive force between the second-level high-frequency vibrator and the first-level low-frequency vibrator, and the repulsive force further excites a high-frequency vibration component of the first-level low-frequency vibrator. The first-level low-frequency vibrator and the second-level high-frequency vibrator generate electric energy through vibration. The two-level vibrating type broadband energy harvester has the advantages that the two-level vibrating type broadband energy harvester can work within the broad frequency range, the power generation efficiency is less affected by external vibration, reliability is high, the space utilization rate is high, power generation efficiency is high, and vibrator parameters can be adjusted according to actual needs to obtain electric energy of the needed frequency independent of environment vibration frequency. The two-level vibrating type broadband energy harvester can be applied to a wireless sensor, wireless communication and the like, powers wireless equipment, replaces an original battery power supply mode, has wide application prospects, is simple in structure and easily achieves industrialization.
Description
Technical field
The present invention relates to a kind of energy collecting device, more particularly to a kind of secondary vibration formula broadband energy collecting device.
Background technology
With developing rapidly of radio sensing network and microelectromechanical systems, occur in that many wireless sensers etc. are wireless
Equipment.How effectively to power for them and paid close attention to by people more and more.These equipment mainly pass through battery at present
Power supply.But, the short life of battery, store finite energy, and often volume and quality for the equipment that it is powered
Very big.In addition, in many applications, changing cell process complexity, the cost causing is very high.Therefore, how to solve wirelessly to set
Standby powerup issue becomes the focus of research.
Vibration energy collector can be converted into electric energy vibration kinetic energy present in environment.According to its transducing mode, can
To be divided into electrostatic, piezoelectric type and three kinds of electromagnetic type.For traditional vibration energy collector, only when shaking in external environment
When dynamic frequency is near the eigenfrequency of vibrational structure in energy collecting device, vibrational structure resonates, and amplitude is larger, collector
Enough electric energy could be exported.When external environment vibration frequency deviates and changes eigenfrequency, the electric energy of output is comparatively small.This is tight
Limit the range of application of energy collecting device again.On the other hand, for lower frequency ranges（10 hertz of magnitudes）Ambient vibration,
The eigenfrequency of resonant mode energy collecting device is necessarily designed relatively low, and what the transducing mode such as electrostatic, piezoelectricity and electromagnetism sent
Power is to increase and raising with vibration frequency.Therefore when environmental vibration frequency is relatively low, the electric energy also very little of output.
2012, Univ Michigan-Ann Arbor USA made the energy collecting device of disresonance type（Galchev,T.;Aktakka,
E.E.;Najafi,K.,"A Piezoelectric Parametric Frequency Increased Generator for
Harvesting Low-Frequency Vibrations,"Microelectromechanical Systems,Journal
of,vol.21,no.6,pp.1311,1320,Dec.2012）.By magnetic attraction, magnetic mass replaces and upper and lower two bullets
Spring oscillator adhesive and separately.The separately rear spring oscillator free vibration of magnet on mass and spring, is generated electricity by electromagnetic induction.
This energy collecting device passes through the adhesive of magnet and separates driving spring oscillator it is not necessary to there is resonance, Ke Yi with extraneous vibration
Work in wider ambient vibration frequency band, generating efficiency is subject to extraneous vibration frequency influence little.Meanwhile, the eigenfrequency of spring oscillator
Far above typical environment vibration frequency, therefore electricity generation efficiency is higher.But due to being using magnetic attraction work, so mass
On magnet and vibrating spring on magnetic pull can not be too big, otherwise can lead to not separately, device will be unable to work, because
And its generated output is restricted.And, can collide when mass and spring oscillator adhesive at work, exist and rushed
Hit the risk of damage, the reliability of this kind of energy collecting device it cannot be guaranteed that.
2010, Catania, ITA university and second largest of Montpellier, France were produced jointly and have been utilized magnetic repulsion
Bistable state vibration energy collector（Andò,B.,et al."Nonlinear mechanism in MEMS devices for
energy harvesting applications."Journal of Micromechanics and
Microengineering20.12(2010):125020.）.Deposit between the magnet on fixed magnet and cantilever beam on collector
In magnetic repulsion so that cantilever beam oscillator is in bistable state.Due to bistable presence, this energy collecting device is with respect to monostable
State resonant mode energy collecting device has broader frequency response range to ambient vibration.Fixed magnet is leaned on the magnet on cantilever beam
Magnetic repulsion interacts, and does not occur adhesive to collide, reliability is higher.The response however, bistable structure is not significantly increased
In high fdrequency component, the therefore effect of transducing is not good.Meanwhile, the bistable state effect that a pair of magnet introduces only is embodied in single
On oscillator, magnetic field is not efficiently utilized.
Therefore it provides one kind can overcome, existing energy collecting device operating frequency is limited, generated output density is little, reliability
The novel energy collector of the deficiency of difference is necessary.
Content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of secondary vibration formula broadband energy
Amount collector, for solving limited by energy collecting device operating frequency in prior art, generated output density is little, poor reliability ask
Topic.
For achieving the above object and other related purposes, the present invention provides a kind of secondary vibration formula broadband energy acquisition
Device, at least includes：
First order low-frequency vibrator, for sensing the vibration of external environment；
Second level high frequency oscillator, is driven by the repulsive force with described first order low-frequency vibrator, and described repulsive force is simultaneously
Excite the dither component of described first order low-frequency vibrator；
Described first order low-frequency vibrator and second level high frequency oscillator pass through vibration and produce electric energy.
As a kind of preferred version of the secondary vibration formula broadband energy collecting device of the present invention, its energy derives from the external world
The vibration of environment.
As a kind of preferred version of the secondary vibration formula broadband energy collecting device of the present invention, described first order low frequency shakes
Son is parallel to each other with the direction of vibration of second level high frequency oscillator.
As a kind of preferred version of the secondary vibration formula broadband energy collecting device of the present invention, described first order low frequency shakes
Vibration is converted into electric energy by piezo-electric effect, electromagnetic induction or electrostatic induction by son and second level high frequency oscillator.
As a kind of preferred version of the secondary vibration formula broadband energy collecting device of the present invention, described first order low frequency shakes
Between son and second level high frequency oscillator, there is preset pitch.
As a kind of preferred version of the secondary vibration formula broadband energy collecting device of the present invention, described repulsive force is arranged for magnetic
Repulsion or electrostatic repulsion forces.
As a kind of preferred version of the secondary vibration formula broadband energy collecting device of the present invention, described second level high frequency vibrating
The vibration frequency of son is the resonant frequency of its own, and it is equal with the resonant frequency of its own that it produces the frequency of electric energy.
As a kind of preferred version of the secondary vibration formula broadband energy collecting device of the present invention, described first order low frequency shakes
The vibration of son includes the dither component that the vibration of external environment and described repulsive force excite.
As a kind of preferred version of the secondary vibration formula broadband energy collecting device of the present invention, described first order low frequency shakes
The resonant frequency of son is 10 hertz of magnitudes, and the resonant frequency of described second level high frequency oscillator is 100 hertz of magnitudes.
As a kind of preferred version of the secondary vibration formula broadband energy collecting device of the present invention, described first order low frequency shakes
Attached bag includes：The fixing folding cantilever beam of special of first end, it is fixed on first piezoelectric membrane on described folding cantilever beam of special surface, is fixed on institute
State the first magnet and the mass at folding cantilever beam of special second end；Described second level high frequency vibrating attached bag includes：It is simple that first end is fixed
Cantilever beam, it is fixed on second piezoelectric membrane on described simple cantilever beam surface, is fixed on the of described simple cantilever beam second end
Two magnet；Second end of described folding cantilever beam of special has preset pitch with the second end of described simple cantilever beam.
As described above, the present invention provides a kind of secondary vibration formula broadband energy collecting device, at least include：First order low frequency
Oscillator, for sensing the vibration of external environment；Second level high frequency oscillator, is driven by the repulsive force with described first order low-frequency vibrator
Dynamic, and described repulsive force excites the dither component of described first order low-frequency vibrator simultaneously；Described first order low-frequency vibrator and
Second level high frequency oscillator passes through vibration and produces electric energy.The invention has the advantages that：
1）Whole system is non-resonant, and second level high frequency oscillator is driven by pulse magnetic repulsion, and the first order is low
The dither component that the electric energy that frequency vibration produces excites essentially from pulse magnetic repulsion, so energy collecting device can be very
Wide frequency ranges of operation, generated output is subject to extraneous vibration frequency influence little.
2）In the course of the work, the effect between two-stage oscillator relies on magnetic repulsion, does not collide each other, so energy
The reliability of amount collector is improved；
3）Two-stage oscillator all can send electric energy, and energy collecting device space availability ratio is high；
4）The frequency of second level high frequency oscillator vibrating power-generation is the resonant frequency of its own, unrelated with extraneous vibration frequency,
The electric energy of frequency needed for oscillator gain of parameter therefore can be adjusted according to the actual requirements, without dependence environmental vibration frequency.
Brief description
Fig. 1 is shown as a kind of structural representation of embodiment of secondary vibration formula broadband energy collecting device of the present invention
Figure.
Fig. 2～Fig. 4 is shown as the work in a kind of embodiment of secondary vibration formula broadband energy collecting device of the present invention
Make process schematic.
Fig. 5 is shown as the second level high frequency oscillator voltage output figure of the secondary vibration formula broadband energy collecting device of the present invention
Picture and its Fourier transformation, as seen from the figure, the ac frequency that described second level high frequency oscillator sends is the resonance of oscillator itself
Frequency.
Fig. 6 is shown as the first order low-frequency vibrator voltage output figure of the secondary vibration formula broadband energy collecting device of the present invention
Picture and its Fourier transformation, as seen from the figure, the ac frequency that described first order low-frequency vibrator sends not only includes extraneous vibration
Frequency, also includes the high fdrequency component that the interaction of two-stage oscillator introduces.
Component label instructions
101 folding cantilever beam of specials
102 first piezoelectric membranes
103 first magnet
104 masses
201 simple cantilever beams
202 second piezoelectric membranes
203 second magnet
Specific embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also be by addition different concrete realities
The mode of applying is carried out or applies, and the every details in this specification can also be based on different viewpoints and application, without departing from
Carry out various modifications and changes under the spirit of the present invention.
Refer to Fig. 1～Fig. 6.It should be noted that the diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shows the assembly relevant with the present invention rather than then according to package count during actual enforcement in schema
Mesh, shape and size are drawn, and during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its
Assembly layout kenel is likely to increasingly complex.
As shown in figure 1, the present embodiment provides a kind of secondary vibration formula broadband energy collecting device, at least include：
First order low-frequency vibrator, for sensing the vibration of external environment；
Second level high frequency oscillator, is driven by the repulsive force with described first order low-frequency vibrator, and described repulsive force is simultaneously
Excite the dither component of described first order low-frequency vibrator；
Described first order low-frequency vibrator and second level high frequency oscillator pass through vibration and produce electric energy.
As example, the energy of described secondary vibration formula broadband energy collecting device derives from the vibration of external environment.
As example, described first order low-frequency vibrator is parallel to each other with the direction of vibration of second level high frequency oscillator.
As example, described first order low-frequency vibrator and second level high frequency oscillator pass through piezo-electric effect, electromagnetic induction or quiet
Vibration is converted into electric energy by electric induction.
As example, between described first order low-frequency vibrator and second level high frequency oscillator, there is preset pitch.Due to having
Preset pitch, can't collide during two oscillator work, reliability is high.
As example, described repulsive force is magnetic repulsion or electrostatic repulsion forces.The energy collecting device of the present invention passes through above-mentioned
Two kinds of repulsive forces drive the dither of two-stage oscillator, therefore do not need to resonate with external environment, and generated output is subject to environment
Vibration frequency impact is little, and generated output density is high, good reliability.
As example, the vibration frequency of described second level high frequency oscillator is the resonant frequency of its own, and it produces electric energy
Frequency is equal with the resonant frequency of its own.
As example, the vibration of described first order low-frequency vibrator includes the vibration of external environment and described repulsive force excites
Dither component.
As example, the resonant frequency of described first order low-frequency vibrator is 10 hertz of magnitudes, described second level high frequency oscillator
Resonant frequency be 100 hertz of magnitudes.Because the resonant frequency of described first order low-frequency vibrator is close with extraneous vibration frequency,
Thus can be very good to sense the vibration in the external world and produce larger displacement, and the resonant frequency of described second level high frequency oscillator
Higher, the collecting efficiency of energy collecting device can be greatly improved.
As shown in figure 1, in a specific implementation process, the secondary vibration formula broadband energy collecting device bag of the present invention
Include first order low-frequency vibrator and second level high frequency oscillator, wherein, described first order low-frequency vibrator includes：The fixing folding of first end
Cantilever beam 101, it is fixed on first piezoelectric membrane 102 on described folding cantilever beam of special 101 surface, is fixed on described folding cantilever beam of special
First magnet 103 at 101 second ends and mass 104；Described second level high frequency vibrating attached bag includes：The fixing simple cantilever of first end
Beam 201, it is fixed on second piezoelectric membrane 202 on described simple cantilever beam 201 surface, is fixed on described simple cantilever beam 201
Second magnet 203 at two ends；Second end of the second end of described folding cantilever beam of special 101 and described simple cantilever beam 201 has pre-
If spacing.
The resonant frequency of described first order low-frequency vibrator is relatively low, in 10 hertz of magnitudes；Described second level high frequency oscillator humorous
Vibration frequency is higher, in 100 hertz of magnitudes.Described first magnet 103 is identical with the polar orientation of the second magnet 203.When energy is adopted
When storage vibrates with external environment, the mass 104 of first order low-frequency vibrator due to being acted on by inertia force, the described first order
Low-frequency vibrator vibrates, and its vibration frequency frequency is identical with environmental vibration frequency.The resonant frequency of described second level high frequency oscillator
Far above the environmental vibration frequency in typical case's application, therefore vibrate little with ambient vibration.By two-stage oscillator magnet it
Between pulse magnetic repulsion, first order low-frequency vibrator transfers energy to second level high frequency oscillator, makes described second level high frequency vibrating
Son is according to the resonant frequency free vibration of oneself.Piezoelectric membrane on two-stage oscillator deforms upon, thus producing electric energy.In work
During, second level high frequency oscillator makes the vibration frequency of described first order low-frequency vibrator to the reaction of first order low-frequency vibrator
No longer merely identical with environmental vibration frequency, but carried dither component, this makes described first order low-frequency vibrator
Generated energy more merely according to environmental frequencies vibration be greatly improved.
In the present embodiment, the width of described folding cantilever beam of special 101 is 1 millimeter, and two parts length folded up is respectively
For 27 millimeters and 17 millimeters.The mass 104 at described folding cantilever beam of special 101 second end is lead, and quality is 0.14 gram.Described
One magnet 103 is ndfeb magnet, cylindrically shaped, a diameter of 1.5 millimeters, a height of 0.5 millimeter, and magnetic field intensity is 0.3 spy
Si La.
The width of described simple cantilever beam 201 is 1 millimeter, and length is 8.5 millimeters.Described second magnet 203 is neodymium iron boron
Magnet, cylindrically shaped, a diameter of 1.5 millimeters, a height of 0.5 millimeter, magnetic field intensity is 0.3 tesla.Described second magnet
203 masses simultaneously also serving as described second high frequency oscillator, its quality is 7 milligrams.Described first piezoelectric membrane 102 and second
Piezoelectric membrane 202 is PVDF（Kynoar）Piezoelectric membrane, 30 microns of thickness, 8.5 millimeters of effective length.
The energy collecting device of above structure, under one acceleration of gravity of amplitude, the vibration acceleration of 10 hertz of frequency, produces
Raw alternating voltage peak can reach 22.8 volts.The frequency of alternating voltage is 120 hertz.The instantaneous peak power that generates electricity reaches 94.5
Microwatt, mean power 3.3 microwatt.Collector all has super to the extraneous vibration of one acceleration of gravity of amplitude, frequency 9-18 hertz
Cross the generated output of 1.5 microwatts.
The course of work of energy collecting device of the present invention is as shown in Fig. 2 to Fig. 4.When the external world does not vibrate, two-stage
Oscillator is parked in position as shown in Figure 2.If at a time having a downward acceleration effect on energy collecting device, due to used
Property effect, in energy collecting device referential, first order low-frequency vibrator will move upwards.During this, two-stage oscillator magnet
Between repulsive force increase, the simple cantilever beam of second level high frequency oscillator deforms upon in the presence of magnetic repulsion.Work as the first order
When low-frequency vibrator moves to position as shown in Figure 3, magnetic repulsion reaches maximum, the simple cantilever beam of second level high frequency oscillator
201 restoring force is balanced with magnetic repulsion.First order low-frequency vibrator continues up, and undergos mutation in the direction of magnetic repulsion,
Second level high frequency oscillator is moved downward.Now magnetic repulsion strongly reduces, and second level high frequency oscillator is with the resonance of its own
Frequency makees free vibration.This process is equivalent to and applies a pulse magnetic repulsion to second level high frequency oscillator.Meanwhile, the first order
The reaction force that low-frequency vibrator is subject to is also a pulse magnetic repulsion, and this makes first order low-frequency vibrator have bistable property
Matter, is no longer simple linear oscillator, and therefore its vibration frequency also contains dither component in addition to comprising extraneous vibration frequency.
Under lasting external environment is vibrated, first order low-frequency vibrator up-down vibration, drive second level high frequency in each vibration period
Oscillator is twice.The high fdrequency component of the vibration frequency of second level high frequency oscillator and the vibration of first order low-frequency vibrator and ambient vibration frequency
Rate unrelated it is not necessary to there is resonance with extraneous vibration, thus have good response to wider ambient vibration frequency band.Due to magnetic force
It is repulsive force, do not collide between magnet, adhesive, thus good reliability.Because two-stage oscillator all has generating function, thus empty
Between utilization rate high.
Fig. 5 is shown as the second level high frequency oscillator voltage output figure of the secondary vibration formula broadband energy collecting device of the present invention
Picture and its Fourier transformation, as seen from the figure, the ac frequency that described second level high frequency oscillator sends is the resonance of oscillator itself
Frequency.
Fig. 6 is shown as the first order low-frequency vibrator voltage output figure of the secondary vibration formula broadband energy collecting device of the present invention
Picture and its Fourier transformation, as seen from the figure, the ac frequency that described first order low-frequency vibrator sends not only includes extraneous vibration
Frequency, also includes the high fdrequency component that the interaction of two-stage oscillator introduces.
In sum, the present invention provides a kind of secondary vibration formula broadband energy collecting device, at least includes：First order low frequency
Oscillator, for sensing the vibration of external environment；Second level high frequency oscillator, is driven by the repulsive force with described first order low-frequency vibrator
Dynamic, and described repulsive force excites the dither component of described first order low-frequency vibrator simultaneously；Described first order low-frequency vibrator and
Second level high frequency oscillator passes through vibration and produces electric energy.The invention has the advantages that：
1）Whole system is non-resonant, and second level high frequency oscillator is driven by pulse magnetic repulsion, and the first order is low
The dither component that the electric energy that frequency vibration produces excites essentially from pulse magnetic repulsion, so energy collecting device can be very
Wide frequency ranges of operation, generated output is subject to extraneous vibration frequency influence little.
2）In the course of the work, the effect between two-stage oscillator relies on magnetic repulsion, does not collide each other, so energy
The reliability of amount collector is improved；
3）Two-stage oscillator all can send electric energy, and energy collecting device space availability ratio is high；
4）The frequency of second level high frequency oscillator vibrating power-generation is the resonant frequency of its own, unrelated with extraneous vibration frequency,
The electric energy of frequency needed for oscillator gain of parameter therefore can be adjusted according to the actual requirements, without dependence environmental vibration frequency.
So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
Above-described embodiment only principle of the illustrative present invention and its effect, not for the restriction present invention.Any ripe
The personage knowing this technology all can carry out modifications and changes without prejudice under the spirit and the scope of the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
All equivalent modifications becoming or change, must be covered by the claim of the present invention.
Claims (8)
1. a kind of secondary vibration formula broadband energy collecting device is it is characterised in that at least include：
First order low-frequency vibrator, including：The fixing folding cantilever beam of special of first end, it is fixed on the first of described folding cantilever beam of special surface
Piezoelectric membrane, the first magnet being fixed on described folding cantilever beam of special second end and mass, for sensing the vibration of external environment；
Second level high frequency oscillator, including：The fixing simple cantilever beam of first end, it is fixed on the second of described simple cantilever beam surface
Piezoelectric membrane, it is fixed on second magnet at described simple cantilever beam second end, the second end of described simple cantilever beam and described folding
Second end of folded cantilever beam has preset pitch, is driven by the repulsive force with described first order low-frequency vibrator, and described repulsion
Power excites the dither component of described first order low-frequency vibrator simultaneously；
Described first order low-frequency vibrator and second level high frequency oscillator pass through vibration and produce electric energy.
2. secondary vibration formula broadband energy collecting device according to claim 1 it is characterised in that：Its energy derives from outer
The vibration of boundary's environment.
3. secondary vibration formula broadband energy collecting device according to claim 1 it is characterised in that：Described first order low frequency
Oscillator is parallel to each other with the direction of vibration of second level high frequency oscillator.
4. secondary vibration formula broadband energy collecting device according to claim 1 it is characterised in that：Described first order low frequency
Vibration is converted into electric energy by piezo-electric effect, electromagnetic induction or electrostatic induction by oscillator and second level high frequency oscillator.
5. secondary vibration formula broadband energy collecting device according to claim 1 it is characterised in that：Described first order low frequency
Between oscillator and second level high frequency oscillator, there is preset pitch.
6. secondary vibration formula broadband energy collecting device according to claim 1 it is characterised in that：Described repulsive force is magnetic
Repulsive force or electrostatic repulsion forces.
7. secondary vibration formula broadband energy collecting device according to claim 1 it is characterised in that：Described second level high frequency
The vibration frequency of oscillator is the resonant frequency of its own, and it is equal with the resonant frequency of its own that it produces the frequency of electric energy.
8. secondary vibration formula broadband energy collecting device according to claim 1 it is characterised in that：Described first order low frequency
The resonant frequency of oscillator is 10 hertz of several levels, and the resonant frequency of described second level high frequency oscillator is 100 hertz of several levels.
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| CN104796037A (en) * | 2015-04-22 | 2015-07-22 | 北京工业大学 | Wideband piezoelectric power generating device |
| CN104868784A (en) * | 2015-04-28 | 2015-08-26 | 南京航空航天大学 | Piezoelectric oscillator structure for vibration energy recycling |
| CN104935209B (en) * | 2015-06-10 | 2018-05-15 | 南方科技大学 | Piezoelectric type energy collector and piezoelectric type energy collecting method |
| CN106329987B (en) * | 2015-06-19 | 2019-05-17 | 中国科学院上海微系统与信息技术研究所 | Self-power wireless vibrates autonomous alarm system and its method |
| CN106803726B (en) * | 2015-11-26 | 2019-05-10 | 清华大学 | Low-frequency vibration electromagnetic energy collector |
| CN105553331B (en) * | 2015-12-29 | 2018-06-05 | 南京航空航天大学 | A kind of low frequency piezoelectric vibration energy collector |
| CN105610347A (en) * | 2016-03-17 | 2016-05-25 | 浙江工商大学 | Non-linear wideband piezoelectric vibration energy collector |
| CN105811804B (en) * | 2016-04-08 | 2017-10-31 | 厦门大学 | A kind of broadband piezoelectric energy gathering apparatus based on wire saws |
| CN107994807B (en) * | 2016-10-26 | 2020-02-14 | 中国科学院上海微系统与信息技术研究所 | Low-vibration threshold monitoring secondary energy collector based on ferromagnetic cantilever beam |
| CN106877739B (en) * | 2017-01-18 | 2018-08-17 | 上海交通大学 | The multidirectional pull-type bistable state vibrational energy catcher of magnetic |
| CN108054951B (en) * | 2017-11-21 | 2019-10-18 | 西北工业大学 | A kind of prisoner's energy/energy storage integrated micro-nano battery based on multilayered structure |
| CN110013141B (en) * | 2018-01-09 | 2021-07-16 | 宁波戴维医疗器械股份有限公司 | Posture-keeping sleeping bedding |
| CN108680246B (en) * | 2018-05-14 | 2020-11-06 | 中国科学院上海微系统与信息技术研究所 | Vibration mode recognition device and method based on threshold driving energy collector |
| CN108736763B (en) * | 2018-06-14 | 2020-02-14 | 电子科技大学 | Bidirectional series broadband piezoelectric energy harvester with parallel circuit |
| CN110808693A (en) * | 2019-11-11 | 2020-02-18 | 天津大学 | Double-beam low-frequency rotating mechanical energy collecting device |
| CN114396451B (en) * | 2022-01-19 | 2022-11-11 | 北京市科学技术研究院城市安全与环境科学研究所 | Bistable nonlinear vibration isolator and rail vibration isolation system |
| CN118200823A (en) * | 2024-04-17 | 2024-06-14 | 武汉敏声新技术有限公司 | MEMS loudspeaker |
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| WO2005036728A2 (en) * | 2003-07-30 | 2005-04-21 | The Boeing Company | Strain energy shuttle apparatus and method for vibration energy harvesting |
| WO2010148312A2 (en) * | 2009-06-19 | 2010-12-23 | The Regents Of The University Of Michigan | Increased frequency power generation using low-frequency ambient vibrations |
| CN101656493B (en) * | 2009-09-17 | 2011-07-27 | 上海交通大学 | MEMS wideband piezoelectricity energy collector based on bistable state frequency raising structure |
| CN102790547B (en) * | 2012-07-18 | 2015-08-05 | 天津大学 | Bistable state double cantilever beam piezoelectric generating device |
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