CN205178913U - Changeable type of five stable states of shallow potential well nonlinearity wide band vibration energy collector - Google Patents
Changeable type of five stable states of shallow potential well nonlinearity wide band vibration energy collector Download PDFInfo
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- CN205178913U CN205178913U CN201521054953.2U CN201521054953U CN205178913U CN 205178913 U CN205178913 U CN 205178913U CN 201521054953 U CN201521054953 U CN 201521054953U CN 205178913 U CN205178913 U CN 205178913U
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Abstract
The utility model discloses a changeable type of five stable states of shallow potential well nonlinearity wide band vibration energy collector, the fastening of the one end of piezoelectricity cantilever beam is on the shell, and the other end is fixed with I, two I symmetry of permanent magnet of two permanent magnets and fixes on two sides of the neutral surface of piezoelectricity cantilever beam, and two I heterocharge of permanent magnet are relative, and the surface of the equal perpendicular to piezoelectricity cantilever beam of polarised direction, two permanent magnets II are fixed on the internal surface of shell for the neutral surface symmetry of piezoelectricity cantilever beam, and two II heterocharge of permanent magnet are relative, and the surface of the equal perpendicular to piezoelectricity cantilever beam of polarised direction, and the heterocharge of II and two permanent magnets I of two permanent magnets is relative, and two hold back symmetrical arrangement are in the neutral surface both sides of piezoelectricity cantilever beam and fix on the shell. The utility model discloses have the design of five stable states, and realize higher magnetic field utilization ratio, have stronger miniaturized potentiality, can also switch over the stable state type in the required excitation magnitude of reduction work to the needs of the complicated excitation environment of adaptation.
Description
Technical field
The utility model belongs to energy acquisition technical field, particularly relates to a kind of shallow potential well five steady-state variance wideband vibration energy collector.
Background technology
At present, mostly known wideband non-linear piezoelectric vibration energy collector is that utilizing piezoelectric bimorph or the additional magneticaction of piezoelectric monocrystal sheet cantilever beam to form nonlinear system restoring force obtains wider vibration frequency range and higher output voltage.Wherein, the adjustment of mission nonlinear restoring force can only be realized by the size and distributing position changing magnet.The stable state number formed according to collector oscillator is distinguished, and the non-linear piezoelectric vibration energy collector of wideband proposed at present can be divided into monostable, bistable state and three-stable state three class.Due to complexity and the essentially nonlinear of magnetic force, this extensive structural adjustment and optimization method limit the further lifting of collector output performance, the characteristic that cannot make full use of magnetic field, to promote its power density, bandwidth of operation and the sensitiveness to excitation faint in environment, limits further miniaturization and the high power of collector.Meanwhile, the Optimum Excitation environment corresponding to different stable state type is had nothing in common with each other, and the vibration energy collector of single stable state type cannot meet the needs of excitation situation engineering reality complicated and changeable in actual applications.Therefore, exploitation can make full use of magnetic field performance, has more high power density and Miniaturization Design potentiality and the wideband non-linear piezoelectric vibration energy collector that simply can switch stable state type is very necessary.
Utility model content
In order to overcome that existing wideband non-linear piezoelectric vibration energy collector tactic pattern is single, power density is low and cannot the shortcoming of compact efficient, and improve the output effect of collector under small excitation further, the utility model provides a kind of shallow potential well five stable state switching piezoelectric vibration energy collector, this collector has five bistable design of innovation, and higher magnetic field utilance and miniaturization potential, stable state type can also be switched, to adapt to the needs of complex incentive environment while encouraging magnitude needed for reduction work.
The utility model is achieved through the following technical solutions:
The non-linear wideband vibration energy collector of shallow potential well five stable state switching, comprises shell (1), piezoelectric cantilever (2), two stoppers (5), two permanent magnets, I (3), two permanent magnets II (4); One end of described piezoelectric cantilever (2) is fastened on shell (1), the other end of piezoelectric cantilever (2) is fixed with two permanent magnets I (3), two permanent magnet I symmetries are fixed on two sides of the neutral surface of piezoelectric cantilever (2), two permanent magnet I heteropoles are relative, and polarised direction is all perpendicular to the surface of piezoelectric cantilever; Two permanent magnets II (4) are fixed on the inner surface of shell relative to the neutral surface symmetry of piezoelectric cantilever, two permanent magnet II (4) heteropoles are relative, and polarised direction is all perpendicular to the surface of piezoelectric cantilever, and two permanent magnets II (4) are relative with the heteropole of two permanent magnets I (3), two stoppers (5) are symmetrically arranged in the neutral surface both sides of piezoelectric cantilever (2) and are fixed on shell, and two stoppers are provided with the position of collision a for colliding with piezoelectric cantilever 2.
In technique scheme, described piezoelectric cantilever 2 length is 90mm, wide 15mm, thick 0.3mm; The volume of two permanent magnets I is identical, and is 10 × 5 × 1.5mm
3, the volume of two permanent magnets II is identical, and is 20 × 10 × 5mm
3; The opposite face spacing of two permanent magnets II is 30mm, and the left surface of two permanent magnets II and the right surface of permanent magnet I are in the horizontal direction at a distance of 4mm.
In technique scheme, position of collision a and piezoelectric cantilever surface are at a distance of 2.4mm, and the horizontal range of the stiff end of position of collision a and piezoelectric cantilever is 35mm, and the stiff end of piezoelectric cantilever is the one end of the piezoelectric cantilever be fixedly connected with shell.
In technique scheme, in two stoppers, be provided with the adjustable screw in position (6) respectively, in order to adjust the distance on screw screw terminal and piezoelectric cantilever surface, to realize the switching of different stable state.
In technique scheme, the screw terminal of screw (6) and piezoelectric cantilever surface are at a distance of 1.7mm, and the horizontal range of the stiff end of the screw terminal of screw and piezoelectric cantilever is 33mm, the stiff end of piezoelectric cantilever is the one end of the piezoelectric cantilever be fixedly connected with shell.
In technique scheme, micrometer push rod structure (7) is provided with respectively in two stoppers, described micrometer push rod structure (7) comprises screw rod (7-1), fixed muffle (7-2), quill (7-3), fixed muffle (7-2) and quill (7-3) are provided with scale, one end and the quill (7-3) of screw rod (7-1) are coaxially fixed, fixed muffle (7-2) is coaxially connected on screw rod (7-1) by thread bush, one end of quill (7-3) is coaxially rotatable to be socketed on fixed muffle (7-2), fixed muffle (7-2) is fixed with shell (1), by screwing quill (7-3), and the distance between the screw terminal of screw rod and piezoelectric cantilever surface can be adjusted accurately in conjunction with scale, to realize the switching of different stable state.
In technique scheme, two permanent magnets I are rubidium iron boron permanent magnet.
In technique scheme, two permanent magnets II are rubidium iron boron permanent magnet.
Advantage of the present utility model and beneficial effect are:
(1) compared with bistable state and three-stable state, potential energy distribution can be entered in more potential well by exclusive five steady-state systems of the present invention, thus have the more shallow potential well of the degree of depth, collector oscillator (rubidium iron boron permanent magnet I) can be run off under less excitation energy between trap that place potential well carries out large amplitude and move.In addition, more stable state can promote the resonance bandwidth of collector effectively, makes piezoelectric structure produce higher power stage in wider frequency band, to this increase collector to the sensitiveness of faint excitation and adaptability;
(2) due to the effect of stopper, the region of high stress is no longer only positioned at the root of beam, and the piezoelectric patches on piezoelectric cantilever creates larger strain, and its power output is obviously promoted;
(3) compared to the multistable vibration energy collector that other utilization magnetic field is formed, design of the present invention can make magnetic inertia mass fully near outside permanent magnet, thus improve magnetic energy utilization rate and the power output of system, decrease the dependence of collector to permanent magnet volume, and then reduce the impact of collector on neighbouring electronic equipment, make collector can be further miniaturized and integrated;
(4) switching of collector stable state type can be realized, to adapt to the requirement of different incentive environment to collector.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention one.
Fig. 2 is the cross section structural map of Fig. 1.
Fig. 3 is cantilever beam free end magnon in embodiment one (i.e. rubidium iron boron permanent magnet I) the stressed graph of a relation in vertical.
Fig. 4 is the potential-energy function of the vibration energy collector system in embodiment one.
Fig. 5 is the structural representation of the embodiment of the present invention two.
Fig. 6 is the cross section structural map of Fig. 5.
Fig. 7 is the stressed graph of a relation of cantilever beam free end magnon in vertical (simultaneously compared for the stressed graph of a relation of cantilever beam free end magnon in embodiment one) in embodiment two.
Fig. 8 is the structural representation of the embodiment of the present invention three.
Fig. 9 is the structural representation of traditional micrometer.
In figure: 1 is shell, 2 is piezoelectric cantilever, and 3 is rubidium iron boron permanent magnet I, 3-1 is upper rubidium iron boron permanent magnet I, 3-2 is lower rubidium iron boron permanent magnet I, 4 is rubidium iron boron permanent magnet II, 4-1 be upper rubidium iron boron permanent magnet II, 4-2 is lower rubidium iron boron permanent magnet II, 5 is stopper, 6 is bolt, and 7 is micrometer push rod structure, and 8 is through hole.
Embodiment
The technical solution of the utility model is further illustrated below in conjunction with specific embodiment.
Embodiment one:
Low and cannot the shortcoming of compact efficient in order to overcome existing wideband non-linear piezoelectric vibration energy collector power density, and improve the output effect of collector under small excitation further, present embodiments provide a kind of shallow potential well five steady-state variance wideband vibration energy collector.As shown in Figure 1-2, described shallow potential well five steady-state variance wideband vibration energy collector, comprise shell 1, piezoelectric cantilever 2 (experimentally needs, carries out part separating treatment to the piezoelectricity lamella of piezoelectric cantilever, also can keep the integrality of whole piezoelectricity lamella, what show in figure is the schematic construction of piezoelectric cantilever), two stoppers, 5, two rubidium iron boron permanent magnets, I 3, two rubidium iron boron permanent magnets II 4, described piezoelectric cantilever 2 length is 90mm, wide 15mm, thick 0.3mm, the left end of electric cantilever beam 2 is fastened on shell 1, (volume is 10 × 5 × 1.5mm to a pair rubidium iron boron permanent magnet, I 3, two rubidium iron boron permanent magnets I 3 that piezoelectric cantilever 2 right-hand member is fixed with for serving as inertia mass
3) symmetry is fixed on two sides of the neutral surface of piezoelectric cantilever 2, two rubidium iron boron permanent magnet I 3 heteropoles are relative, and polarised direction is all perpendicular to the surface of piezoelectric cantilever 2, (volume is 20 × 10 × 5mm to two rubidium iron boron permanent magnets II 4
3) be fixed on the inner surface of shell 1 relative to the neutral surface symmetry of piezoelectric cantilever 2, two rubidium iron boron permanent magnet II 4 heteropoles are relative, and polarised direction is all perpendicular to the surface of piezoelectric cantilever 2, and two rubidium iron boron permanent magnets II 4 are relative with the heteropole of two rubidium iron boron permanent magnets I 3 (namely goes up rubidium iron boron permanent magnet II 4-1 relative with upper rubidium iron boron permanent magnet I 3-1 heteropole, lower rubidium iron boron permanent magnet II 4-2 is relative with lower rubidium iron boron permanent magnet I 3-2 heteropole), the opposite face of two rubidium iron boron permanent magnets II 4 is between the upper and lower every 30mm (namely go up the lower surface of rubidium iron boron permanent magnet II and the upper surface spacing of lower rubidium iron boron permanent magnet II is 30mm), the left surface of two rubidium iron boron permanent magnets II 4 and the right surface of rubidium iron boron permanent magnet I 3 are in the horizontal direction at a distance of 4mm, two stoppers 5 are symmetrically arranged in the neutral surface both sides of piezoelectric cantilever 2 and are fixed by screw and shell 1, two stoppers are provided with for (one side that stopper is relative with piezoelectric cantilever is plane with the stop position a that piezoelectric cantilever 2 comes in contact, the low order end of this plane is stop position a, namely position of collision a), stop position a and piezoelectric cantilever surface are at a distance of 2.4mm, and the horizontal range of the stiff end (one end that piezoelectric cantilever and shell are fixedly connected) of stop position a and piezoelectric cantilever is 35mm.
During use, collector is fixed on vibrational structure surface by the through hole 8 reserved by shell, under the excitation perpendicular to vibration of beam component, piezoelectric cantilever 2 produces vibration, when cantilever beam moves upward and contacts at stop position a with stopper, beam root stops vibration to the part of touch position a, and position a continues motion to the part of cantilever beam end points permanent magnet under effect of inertia, now the effective length of piezoelectric cantilever shortens, equivalent stiffness increases, as shown in Figure 3, the now slope of cantilever beam restoring force (figure middle polyline) suffered by a pair rubidium iron boron permanent magnet I, the i.e. equivalent stiffness of cantilever vibrator, by K
1be increased to K
2, restoring force shows as piecewise linearity, and waypoint to correspond to when failing rubidium iron boron permanent magnet I 3 relative to the vertical deviation of position C.In conjunction with the non-linear attraction (i.e. in accompanying drawing 3 curve S) of two rubidium iron boron permanent magnets II to two rubidium iron boron permanent magnets I, piezoelectric cantilever exist in motion process 9 equilbrium positions (namely make a concerted effort suffered by rubidium iron boron permanent magnet I be zero position, intersection point for curve S and K1, K2 in accompanying drawing 3), wherein 5 equilbrium positions are stable (when rubidium iron boron permanent magnet I is in these positions, even if there is small sample perturbations to make it slightly depart from this position, under the effect of system resilience and damping force, permanent magnet still can finally be stable on these positions.), i.e. A, B, C, D, E.To system resilience (namely permanent magnet I is suffered makes a concerted effort) integration, the potential-energy function of now system can be obtained, as shown in Figure 4, there is the very shallow potential well of five degree of depth in potential energy of system, position A, B, C, D, E in Fig. 3 correspond to the minimum point of each potential well in potential-energy function respectively, when collector works, inertia mass will be moved between these five potential wells, and vibrational energy acquisition system is now five steady-state systems.
Compared with bistable state and three-stable state, potential energy distribution can be entered in more potential well by exclusive five steady-state systems of the present invention, thus have the more shallow potential well of the degree of depth, collector oscillator (rubidium iron boron permanent magnet I) can be run off under less excitation energy between trap that place potential well carries out large amplitude and move.In addition, there is the resonance bandwidth that effectively can promote collector in more stable state, thus makes piezoelectric structure produce higher power stage in wider frequency band.
Due to the effect of stopper, piezoelectric cantilever obtains larger strain (may damage piezoelectric patches to prevent the collision of stopper and piezoelectric beam, halt place does not arrange piezoelectric patches, and the basic unit that stopper is larger with piezoelectric beam hardness contacts), its output voltage is obviously promoted.Compared to the multistable vibration energy collector that other utilization magnetic field is formed, design of the present invention can make magnetic inertia mass (i.e. rubidium iron boron permanent magnet I) can be more sufficient near external permanent magnets (i.e. rubidium iron boron permanent magnet II), improve the magnetic energy utilization rate of system, thus improve output performance and the power density of collector.From another viewpoint, the lifting of magnetic energy utilization rate makes the dependence of collector to permanent magnet volume reduce further, and then reduces the impact of collector on neighbouring electronic equipment, makes collector can be further miniaturized and integrated.
Embodiment two:
The vibration energy collector of different stable state type the Optimum Excitation environment that is suitable for have nothing in common with each other, although the shallow potential well five steady-state variance wideband vibration energy collector described in above-described embodiment one in most of the cases can provide stable energy input for the equipment in faint incentive environment, but move because multistable system is more easily absorbed in small size trap under some arbitrary excitation types, so the output performance of shallow potential well five steady-state variance wideband vibration energy collector under these arbitrary excitation environment described in embodiment one may be worse than have the monostable collector that rigidity " softens " effect.In order to the vibration energy collector solving single stable state type cannot meet the problem of excitation situation actual demands of engineering complicated and changeable in actual applications, the present embodiment, on the basis of the shallow potential well five steady-state variance wideband vibration energy collector described in embodiment one, adds and five stable states is switched to monostable function.Concrete grammar is: as seen in figs. 5-6, the adjustable screw in the position 6 (screwed hole that namely vertically processing is penetrating on stopper is provided with respectively in two stoppers 5, screw 6 is screwed in) in screwed hole, the degree of depth of stopper is screwed in by adjustment screw 6, make screw terminal and the piezoelectric cantilever surface 1.7mm apart of screw 6, and the horizontal range of the screw terminal of screw 6 and the stiff end of piezoelectric cantilever is 33mm, now the screw terminal of screw 6 forms stop position b, when piezoelectric cantilever 2 contacts at stop position b with screw 6, as shown in Figure 7, now cantilever beam restoring force slope suffered by a pair rubidium iron boron permanent magnet I is by K
1become K
3in conjunction with two rubidium iron boron permanent magnets II to the non-linear attraction of two rubidium iron boron permanent magnets I, the piezoelectric cantilever balance point that only existence anduniquess is stable in motion process (i.e. position C in Fig. 7), in conjunction with the rigidity softening effect (external manifestation be cantilever beam distortion more easy) of attractive magnetic force to piezoelectric cantilever, now vibrational energy acquisition system " softens " the monostable system of effect for having rigidity, ensure that the output of collector under arbitrary excitation environment, improve the adaptability of collector.
Embodiment three:
Comparative example two, in order to control the location accuracy of position of collision b further, as shown in Figure 8, on the basis of the shallow potential well five steady-state variance wideband vibration energy collector described in embodiment one, micrometer push rod structure 7 is provided with respectively (as shown in Figure 9 in two stoppers 5, traditional micrometer comprises spiral ejection pin part d and chi frame part c, the described micrometer push rod structure 7 i.e. spiral ejection pin part of micrometer), described micrometer push rod structure 7 comprises screw rod 7-1, fixed muffle 7-2, quill 7-3, fixed muffle 7-2 and quill 7-3 is provided with scale, one end and the quill 7-3 of screw rod 7-1 coaxially fix, fixed muffle 7-2 is coaxially connected on screw rod 7-1 by thread bush, one end of quill 7-3 is coaxially rotatable to be socketed on fixed muffle 7-2, fixed muffle 7-2 and shell 1 are fixed, by screwing quill 7-3, and distance between the screw terminal of screw rod and piezoelectric cantilever surface can be adjusted accurately (when micrometer push rod structure 7 is installed in conjunction with scale, when ensureing that the screw terminal of screw rod contacts with piezoelectric cantilever surface, scale is 0), thus determine position of collision b accurately, fixed muffle 7-2 is also provided with the locking device 7-4 for tie down screw, after adjusting the position of collision b described in embodiment two, by locking device 7-4 by locked for screw rod 7-1, when preventing from gathering vibration signal, its position changes, and affects collection effect.
Above exemplary description is done to the utility model; should be noted that; when not departing from core of the present utility model, any simple distortion, amendment or other those skilled in the art can not spend the equivalent replacement of creative work all to fall into protection range of the present utility model.
Claims (7)
1. the non-linear wideband vibration energy collector of shallow potential well five stable state switching, it is characterized in that, comprise shell (1), piezoelectric cantilever (2), two stoppers (5), two permanent magnets, I (3), two permanent magnets II (4); One end of described piezoelectric cantilever (2) is fastened on shell (1), the other end of piezoelectric cantilever (2) is fixed with two permanent magnets I (3), two permanent magnet I symmetries are fixed on two sides of the neutral surface of piezoelectric cantilever (2), two permanent magnet I heteropoles are relative, and polarised direction is all perpendicular to the surface of piezoelectric cantilever; Two permanent magnets II (4) are fixed on the inner surface of shell relative to the neutral surface symmetry of piezoelectric cantilever, two permanent magnet II (4) heteropoles are relative, and polarised direction is all perpendicular to the surface of piezoelectric cantilever, and two permanent magnets II (4) are relative with the heteropole of two permanent magnets I (3), two stoppers (5) are symmetrically arranged in the neutral surface both sides of piezoelectric cantilever (2) and are fixed on shell, and two stoppers are provided with the position of collision for colliding with piezoelectric cantilever (2).
2. the non-linear wideband vibration energy collector of shallow potential well five stable state switching according to claim 1, is characterized in that, described piezoelectric cantilever 2 length is 90mm, wide 15mm, thick 0.3mm; The volume of two permanent magnets I is identical, and is 10 × 5 × 1.5mm
3, the volume of two permanent magnets II is identical, and is 20 × 10 × 5mm
3; The opposite face spacing of two permanent magnets II is 30mm, and the left surface of two permanent magnets II and the right surface of permanent magnet I are in the horizontal direction at a distance of 4mm.
3. the non-linear wideband vibration energy collector of shallow potential well five stable state switching according to claim 1, is characterized in that, two permanent magnets I are rubidium iron boron permanent magnet; Two permanent magnets II are rubidium iron boron permanent magnet.
4. according to the non-linear wideband vibration energy collector of shallow potential well five stable state switching one of claim 1-3 Suo Shu, it is characterized in that, position of collision and piezoelectric cantilever surface are at a distance of 2.4mm, the horizontal range of the stiff end of position of collision and piezoelectric cantilever is 35mm, and the stiff end of piezoelectric cantilever is the one end of the piezoelectric cantilever be fixedly connected with shell.
5. according to the non-linear wideband vibration energy collector of shallow potential well five stable state switching one of claim 1-3 Suo Shu, it is characterized in that, the adjustable screw in position is provided with respectively in two stoppers, as position of collision, in order to adjust the distance on screw screw terminal and piezoelectric cantilever surface, to realize the switching of different stable state.
6. according to the non-linear wideband vibration energy collector of shallow potential well five stable state switching one of claim 5 Suo Shu, it is characterized in that, the screw terminal of screw (6) and piezoelectric cantilever surface are at a distance of 1.7mm, and the horizontal range of the stiff end of the screw terminal of screw and piezoelectric cantilever is 33mm, the stiff end of piezoelectric cantilever is the one end of the piezoelectric cantilever be fixedly connected with shell.
7. according to the non-linear wideband vibration energy collector of shallow potential well five stable state switching one of claim 1-3 Suo Shu, it is characterized in that, micrometer push rod structure (7) is provided with respectively in two stoppers, described micrometer push rod structure (7) comprises screw rod (7-1), fixed muffle (7-2), quill (7-3), fixed muffle (7-2) and quill (7-3) are provided with scale, one end and the quill (7-3) of screw rod (7-1) are coaxially fixed, fixed muffle (7-2) is coaxially connected on screw rod (7-1) by thread bush, one end of quill (7-3) is coaxially rotatable to be socketed on fixed muffle (7-2), fixed muffle (7-2) is fixed with shell (1), by screwing quill (7-3), and the distance between the screw terminal of screw rod and piezoelectric cantilever surface can be adjusted accurately in conjunction with scale, to realize the switching of different stable state.
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| CN201521054953.2U CN205178913U (en) | 2015-12-15 | 2015-12-15 | Changeable type of five stable states of shallow potential well nonlinearity wide band vibration energy collector |
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| CN201521054953.2U CN205178913U (en) | 2015-12-15 | 2015-12-15 | Changeable type of five stable states of shallow potential well nonlinearity wide band vibration energy collector |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471318A (en) * | 2015-12-15 | 2016-04-06 | 天津大学 | Shallow-potential-well five-steady state switchable type nonlinear broadband vibration energy harvester and application thereof |
| CN107294422A (en) * | 2017-06-26 | 2017-10-24 | 上海交通大学 | Two-way multistable dielectric elastomer driver |
| CN109831118A (en) * | 2019-01-25 | 2019-05-31 | 天津大学 | A kind of non-linear piezoelectric vibration energy collector of beam type |
-
2015
- 2015-12-15 CN CN201521054953.2U patent/CN205178913U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471318A (en) * | 2015-12-15 | 2016-04-06 | 天津大学 | Shallow-potential-well five-steady state switchable type nonlinear broadband vibration energy harvester and application thereof |
| CN107294422A (en) * | 2017-06-26 | 2017-10-24 | 上海交通大学 | Two-way multistable dielectric elastomer driver |
| CN107294422B (en) * | 2017-06-26 | 2019-03-05 | 上海交通大学 | Two-way multistable dielectric elastomer driver |
| CN109831118A (en) * | 2019-01-25 | 2019-05-31 | 天津大学 | A kind of non-linear piezoelectric vibration energy collector of beam type |
| CN109831118B (en) * | 2019-01-25 | 2023-09-01 | 天津大学 | Cantilever beam type nonlinear piezoelectric vibration energy collector |
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Granted publication date: 20160420 Effective date of abandoning: 20171031 |