CN110829895A - Buckling self-adjusting piezoelectric energy recovery device - Google Patents
Buckling self-adjusting piezoelectric energy recovery device Download PDFInfo
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- H—ELECTRICITY
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
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Abstract
The invention discloses a buckling self-adjusting piezoelectric energy recovery device, which comprises an installation platform (1), and a primary adjusting mechanism (12), a first supporting seat (2) and a second supporting seat (3) which are sequentially arranged on the installation platform (1); the two clamp assemblies are arranged between the first supporting seat (2) and the second supporting seat (3) and are symmetrical with each other; a buckling beam energy collector disposed between the clamp assemblies; the energy collecting-storing unit, the management unit controller and the driving circuit; the piezoelectric energy recovery device has a simple structure and reliable performance, can automatically adjust the buckling level of the buckling beam under different excitation conditions, ensures that the buckling beam always works in a resonance or high-energy track state, and has higher energy recovery efficiency and higher output average power than an energy collector with unchanged ordinary buckling level.
Description
Technical Field
The invention belongs to the field of piezoelectric energy recovery, and particularly relates to a buckling self-adjusting piezoelectric energy recovery device.
Background
The internet of things is often regarded as the third wave of information revolution, is the integrated development of a new generation of information technology, and further expands the information interconnection boundary. Due to the comprehensiveness and the universality of the Internet of things, the industrial chain relates to each level of sensing, network, application and the like, and has wide development prospect. In a huge system of the internet of things, a wireless sensor network occupies a key position. Due to the good prospect that the portability of the intelligent vehicle is matched with the intelligent society, the intelligent vehicle is widely applied to the fields of medical health, structure monitoring and diagnosis, industrial and agricultural production, intelligent transportation and the like related to the Internet of things.
Most of current wireless sensors adopt a battery power supply mode, and considering the maintenance cost of battery replacement and many application occasions where batteries cannot be replaced, the service life of the wireless sensors is greatly limited by the energy provided by the batteries, and the reliability and the economy of a wireless sensor network are seriously influenced. In the actual environment of the intelligent transportation field, vibration energy which is widely distributed and abundant often exists. Many times, these vibration energies have adverse effects on transportation facilities and vehicles and need to be suppressed. The part of vibration energy is utilized to convert the electric energy to be used as a micro energy system for energy supply of the sensor, and the micro energy system has important significance for promoting the further development of the Internet of things in the field of intelligent transportation.
With the impetus of a large number of researchers, vibration energy harvesting techniques have been rapidly evolving while still facing several challenges. One important problem is to improve the bandwidth of the energy collector as much as possible under the condition of ensuring certain power performance so as to solve the problem of variable vibration excitation in the practical application environment. On the solution of expanding the working bandwidth of the energy collector, different structural types such as frequency up-conversion, multimode array, resonance adjustable and nonlinear structure are provided. The multistable nonlinear energy collector means that an energy collector structure has two or more potential energy traps and corresponding steady-state balance points. The most common is the buckling beam structure, which is a classical bistable structure, whose application in energy recovery is extensively studied.
From the above analysis, it can be known that the multistable energy collector has unique advantages and potentials in a wide-band vibration energy collection scheme, but two key problems to be solved are urgently needed to fully exert excellent performances, match the structural potential energy characteristics with excitation and obtain stable high-energy-state response.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a buckling self-adjusting piezoelectric energy recovery device of an energy collector, which has a simple structure and reliable performance, can automatically adjust the buckling level of a buckling beam under different excitation conditions, ensures that the buckling beam always works in a resonance or high-energy track state, and has higher energy recovery efficiency and higher output average power than the common buckling level.
The purpose of the invention is realized by the following technical scheme: a buckling self-adjusting piezoelectric energy recovery device comprises an installation platform, and a primary adjustment mechanism, a first supporting seat and a second supporting seat which are sequentially arranged on the installation platform; the two clamp assemblies are arranged between the first supporting seat and the second supporting seat and are symmetrical with each other; a buckling beam energy collector disposed between the clamp assemblies; the energy collecting-storing unit, the management unit controller and the driving circuit;
grooves are respectively arranged on the opposite end surfaces of the first supporting seat and the second supporting seat, and piezoelectric actuators are arranged in the grooves; the piezoelectric actuator comprises a piezoelectric sheet and an amplifying mechanism which are mechanically stacked, the amplifying mechanism is of a hollow cylinder structure, the piezoelectric sheet is fixed in the middle of the amplifying mechanism and integrated with the amplifying mechanism, and two fixing holes are symmetrically formed in the amplifying mechanism relative to the axis of the piezoelectric sheet; one fixing hole is connected with the supporting seat through a screw, and the other fixing hole is fixedly connected with the first clamp through a screw;
the clamp assembly comprises a first clamp, a second clamp and a third clamp, and the first clamp is connected with a fixing hole in the amplifying mechanism through a screw; the second clamp is fixed on the first clamp through a screw, and the third clamp is fixed on the second clamp through a screw;
the buckling beam energy collector comprises a buckling beam and a mass block; two ends of the buckling beam are respectively fixed between the second clamp and the third clamp, and the mass block is positioned in the middle of the buckling beam; two auxiliary piezoelectric elements and two main piezoelectric elements are symmetrically arranged about the mass block, the main piezoelectric elements are respectively clung to the side surfaces of the buckling beam close to the two ends of the clamp, and the auxiliary piezoelectric elements are respectively clung to the side surfaces of the buckling beam close to the two sides of the mass block;
the primary adjustment mechanism comprises a fixed block and an adjusting screw, the fixed block is arranged on the mounting table on the side surface of the first support base, and the threaded end of the adjusting screw is matched with a counter bore in one end surface of the first support base;
the energy collecting-storing unit, the management unit controller and the driving circuit are arranged on the mounting table, the management unit controller is respectively connected with the auxiliary piezoelectric element, the mounting table and the sensing element through leads, the energy collecting-storing unit is connected with the main piezoelectric element and the mounting table through leads, the driving circuit is connected with the piezoelectric sheet through leads, and the management unit controller, the energy collecting-storing unit and the driving circuit are mutually connected through leads.
Further, the amplification mechanism of the piezoelectric actuator is not in contact with the groove side wall.
Furthermore, the first supporting base and the second supporting base are respectively and fixedly connected with a vibration source.
Further, the piezoelectric sheets in the piezoelectric actuator are mechanically stacked, and the piezoelectric sheets deform under the action of voltage and drive the amplification mechanism to expand and contract.
Further, the buckling beam is made of metal materials, the rigidity of the buckling beam in the motion direction is smaller than that of the piezoelectric actuator in the stretching direction, the buckling level change range of the buckling beam is wider as the stroke of the piezoelectric actuator is larger, and the natural frequency change range of the same buckling beam is wider; the initial state utilizes a first-adjustment mechanism to produce a flexion.
Furthermore, the energy collecting-storing unit is connected with the main piezoelectric element, the management unit controller is connected with the auxiliary piezoelectric element, the driving circuit is respectively connected with the piezoelectric actuators, and the two piezoelectric actuators are connected in parallel.
The invention has the beneficial effects that: the energy collecting-storing unit can collect and store energy when collecting energy in a vibration energy environment, the management unit can acquire the motion state of the buckling beam, the piezoelectric actuator can automatically change the axial output displacement without an external power supply, and the buckling level of the buckling beam is changed to enable the buckling beam to reach a resonance or bistable motion state; when the piezoelectric actuator does not work, the piezoelectric actuator can be used as an energy collector to collect and store energy. Therefore, the energy recovery efficiency and the output average power of the device are higher than those of the energy collector with the unchanged common buckling level, the collected electric energy can be stored and can be used for supplying power to elements such as a wireless sensor, and the energy collection efficiency of the energy collector is improved.
Drawings
FIG. 1 is a schematic structural view of a buckling self-adjusting piezoelectric energy recovery device of the present invention;
FIG. 2 is a schematic diagram of a piezoelectric actuator;
FIG. 3 is a flow chart of a drive circuit control algorithm of the present invention;
FIG. 4 is a graph of the level of buckling versus drive voltage for a buckling beam of the present invention;
FIG. 5 is a diagram of the operating conditions of the beam of the present invention when the natural frequency matches an excitation frequency;
FIG. 6 is a graph showing the displacement of an excitation beam from a monostable to a bistable state according to the present invention;
description of reference numerals: 1-an installation table, 2-a first support seat, 3-a second support seat, 4-a piezoelectric actuator, 41-a piezoelectric sheet, 42-an amplification mechanism, 43-a fixing hole, 5-a first clamp, 6-a second clamp, 7-a third clamp, 8-a main piezoelectric element, 9-a secondary piezoelectric element, 10-a mass block, 11-a bending beam and 12-a primary adjustment mechanism.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the buckling self-adjusting piezoelectric energy recovery device of the present invention comprises an installation platform 1, and a primary adjustment mechanism 12, a first support seat 2 and a second support seat 3 sequentially arranged on the installation platform 1; the two clamp assemblies are arranged between the first supporting seat 2 and the second supporting seat 3 and are symmetrical with each other; a buckling beam energy collector disposed between the clamp assemblies; the energy collecting-storing unit, the management unit controller and the driving circuit;
grooves are respectively arranged on the opposite end surfaces of the first supporting seat 2 and the second supporting seat 3, and piezoelectric actuators 4 are arranged in the grooves; as shown in fig. 2, the piezoelectric actuator 4 includes a mechanically stacked piezoelectric sheet 41 and an amplifying mechanism 42, the amplifying mechanism 42 is a hollow cylinder structure, and the piezoelectric sheet 41 is fixed in the middle of the amplifying mechanism 42 and is integrated with the amplifying mechanism 42; the piezoelectric sheets 41 are bonded together, and two ends of the piezoelectric sheets are rigidly connected with the inner cavity of the amplifying mechanism; when voltage is applied, all the piezoelectric sheets deform together to drive the amplification mechanism to stretch, and the amplification mechanism can amplify the stroke of the piezoelectric sheets; two fixing holes 43 are symmetrically arranged on the amplifying mechanism 42 about the axis of the piezoelectric sheet 41; one fixing hole is connected with the supporting seat through a screw, and the other fixing hole is fixedly connected with the first clamp 5 through a screw;
the clamp assembly comprises a first clamp 5, a second clamp 6 and a third clamp 7, wherein the first clamp 5 is connected with a fixing hole in the amplifying mechanism 42 through a screw; the second clamp 6 is fixed on the first clamp 5 through a screw, and the third clamp 7 is fixed on the second clamp 6 through a screw;
the buckling beam energy collector comprises a buckling beam 11 and a mass block 10; two ends of the buckling beam 11 are respectively fixed between the second clamp 6 and the third clamp 7, and the mass block 10 is positioned in the middle of the buckling beam 11; two auxiliary piezoelectric elements 9 and two main piezoelectric elements 8 are symmetrically arranged about the mass block 10, the main piezoelectric elements 8 are respectively clung to the side surfaces of the buckling beam 11 close to the two ends of the fixture, and the auxiliary piezoelectric elements 9 are respectively clung to the side surfaces of the buckling beam 11 close to the two sides of the mass block 10;
the primary adjustment mechanism 12 comprises a fixed block and an adjusting screw, the fixed block is arranged on the mounting table 1 on the side surface of the first support base 2, and the threaded end of the adjusting screw is matched with a counter bore in one end surface of the first support base 2;
the energy collecting-storing unit, the management unit controller and the driving circuit are arranged on the mounting table 1, the management unit controller is respectively connected with the auxiliary piezoelectric element 9, the mounting table 1 and the sensing element through leads, the energy collecting-storing unit is connected with the main piezoelectric element 8 and the mounting table 1 through leads, the driving circuit is connected with the piezoelectric plate 41 through leads, and the management unit controller, the energy collecting-storing unit and the driving circuit are mutually connected through leads.
Further, the amplifying mechanism 42 of the piezoelectric actuator 4 is not in contact with the side wall of the groove, the groove functions to protect the piezoelectric actuator 4, and the side wall of the groove 42 has a gap from the amplifying mechanism because the amplifying mechanism is deformed and the groove cannot restrict it.
Further, the first supporting base 2 and the second supporting base 3 are respectively fixedly connected with a vibration source.
Further, the piezoelectric sheets in the piezoelectric actuator 4 are mechanically stacked, and deform under the action of voltage, and simultaneously drive the amplification mechanism to expand and contract. Therefore, the inverse piezoelectric effect can be used to increase or decrease the axial displacement output of the piezoelectric actuator 4, and the buckling level of the buckling beam can be changed, and conversely, the positive piezoelectric effect can be used to generate electricity, and the piezoelectric actuator 4 does not output displacement in the initial state. The piezoelectric actuator 4 can instantaneously change the self-output displacement, so that the buckling level of the buckling beam 11 is suddenly changed, and the buckling beam 11 can jump from a monostable low-energy-state response track to a bistable high-energy-state response track.
Further, the buckling beam 11 is made of a metal material, and the rigidity of the buckling beam in the moving direction is smaller than the rigidity of the piezoelectric actuator 4 in the stretching direction, and the larger the stroke of the piezoelectric actuator is, the wider the range of change of the buckling level of the buckling beam 11 is, and the wider the range of change of the natural frequency of the same buckling beam 11 is; the initial state utilizes a first-adjustment mechanism to produce a flexion.
Furthermore, the energy collecting and storing unit is connected with the main piezoelectric element 8, the management unit controller is connected with the auxiliary piezoelectric element 9, the driving circuits are respectively connected with the piezoelectric actuators 4, and the two piezoelectric actuators 4 are connected in parallel.
The piezoelectric energy recovery device comprises a primary adjustment mechanism 12, wherein the thread end of a screw in the primary adjustment mechanism 12 is matched with a counter bore on the end face of the first support base 2, the thread axis is perpendicular to the end face, the screw can be freely contacted and separated, the primary adjustment mechanism 12 directly changes the buckling degree of the buckling beam 11, when initial buckling is generated, the primary adjustment mechanism 12 is contacted with the first support base 2, and after the initial buckling is formed, the primary adjustment mechanism 12 can be detached.
The shape and the moving direction of the mount 1 are not limited as long as the fixing function is satisfied. The size, shape and installation direction of the two supporting bases are not limited, as long as the piezoelectric actuator can be fixed on the installation platform and initial buckling adjustment is facilitated. The type, type and number of the two piezoelectric actuators are not particularly required (in this embodiment, the amplification mechanism adopts a diamond structure, and the two fixing holes are respectively arranged at the top points of the diamond structure), and the larger the stroke of the piezoelectric actuator is, the wider the variation range of the buckling level of the buckling beam 11 is, and the piezoelectric actuator can be selected according to specific needs. The structural form of the primary adjustment mechanism 12 and the contact manner with the first support base 1 are not particularly limited, and generally, the larger the number of the adjustment screws, the more the adjustment screws are, the more the adjustment of the initial buckling is facilitated, and an appropriate primary adjustment manner can be selected according to actual application conditions. Obviously, any fixed connection mode can be adopted between the buckling beam energy collectors (8, 9, 10, 11) and the two piezoelectric actuators, between the two piezoelectric actuators and the supporting bases (2, 3), between the supporting bases (2, 3) and the mounting table 1, and between the primary adjustment mechanism 12 and the mounting table 1.
The rigidity of the buckling beam 11 in the moving direction is smaller than the rigidity of the piezoelectric actuator in the stretching direction, theoretically, the larger the rigidity of the piezoelectric actuator is, the smaller the influence on the buckling beam 11 is, the motion of the buckling beam 11 is more regular, the material, the length, the thickness and the width of the buckling beam 11 have no substantial influence on the invention, and the proper material and size can be selected according to the rigidity requirement. The size, number and symmetry of the piezoelectric sheets (8, 9) have no influence on the invention and can be selected according to the power consumption of the management unit. The mass block 10 is located in the middle of the buckling beam 11, the installation direction and size of the mass block 10 are not particularly limited, the natural frequency of the buckling beam 11 is affected by the mass size, and the mass size can be adjusted as required. The invention is characterized in that the rigidity of the buckling beam 11 is smaller than that of the piezoelectric actuator, the axial displacement of the piezoelectric actuator can realize self-adjustment through the energy generated by the energy collector to change the buckling level of the buckling beam 11 (the control method used in the embodiment is shown in fig. 3), and simultaneously the natural frequency of the buckling beam is changed to enable the buckling beam to always approach to generate resonance, or the buckling beam jumps from a monostable state to a bistable state to collect more energy. In the present embodiment, the two piezoelectric actuators are symmetrically designed and connected in parallel, so that the buckling level of the buckling beam 11 can be adjusted more easily, the piezoelectric actuators are installed in the grooves to protect the piezoelectric actuators, the present invention is not limited to such an installation method, and the piezoelectric actuators can be redesigned according to actual needs, the piezoelectric actuators 4 of the present embodiment contract when subjected to positive voltage, the beam buckling level decreases, the beam buckling increases when subjected to negative voltage, and the relationship between the buckling level of the buckling beam and the driving voltage is shown in fig. 4, and the present invention is not limited to this type of piezoelectric actuators.
The working principle of the invention is as follows: during installation, the supporting base 3 is fixed, the supporting base 2 is loosened, the buckling beam naturally extends, the adjusting screw of the primary adjusting mechanism is rotated to buckle the buckling beam 11 according to the range of external excitation frequency, the natural frequency of the buckling beam is enabled to be within the range of the excitation frequency as far as possible, then the supporting base 2 is fixed, at the moment, the buckling beam 11 has initial buckling, and the primary adjusting mechanism can be detached after primary adjustment is completed. In the initial state, under the action of external excitation, the buckling beam vibrates, the energy generated by the main piezoelectric element 8 and the piezoelectric actuator 4 is collected and stored through the energy collecting-storing unit, and after the stored energy reaches a certain value, the management unit obtains the inherent frequency according to the set buckling level of the buckling beam 11 and compares the inherent frequency with the measured external excitation frequency: if the buckling beam 11 generates resonance or bistable vibration, the management unit does not output driving voltage, and the piezoelectric actuator 4 serves as an energy collector to output energy to the energy collecting-storing unit; if the natural frequency of the buckling beam 11 is greater than the excitation frequency, the piezoelectric actuator 4 stops outputting energy to the energy collecting-storing unit at the moment, the management unit continuously outputs positive voltage increment to drive the actuator to reduce the buckling level of the buckling beam, and simultaneously the natural frequency is reduced until the natural frequency of the buckling beam 11 is consistent with the excitation frequency and generates resonance or bistable vibration, the driving voltage is not output at the moment, and when the external excitation is changed again, the driving voltage is changed; if the natural frequency of the buckling beam 11 is less than the excitation frequency, at this time, the piezoelectric actuator 4 stops outputting energy to the energy collecting and storing unit, the management unit continuously outputs a negative voltage increment to drive the actuator to increase the buckling level of the buckling beam 11, and simultaneously, the natural frequency is increased until the natural frequency of the buckling beam 11 is consistent with the excitation frequency and generates resonance or bistable vibration, at this time, the driving voltage is not output any more, and when the external excitation is changed again, the driving voltage is changed along with the change of the natural frequency of the buckling beam 11 and the excitation frequency are matched again (as shown in fig. 5). Finally, the natural frequency of the buckling beam 11 is matched with the excitation frequency, resonance or bistable state is always generated, and the energy collection efficiency is higher. When the buckling beam 11 is in the resonance state and does not generate the bistable state and the buckling level is large, the management unit may obtain the displacement peak value of the buckling beam 11, and control the driving voltage of the driving circuit to return to zero at the displacement peak value instantly, and the buckling of the buckling beam returns to the initial state instantly, and at this time, the buckling beam 11 obtains a high acceleration to generate the bistable state, as shown in fig. 6. When the bistable state is finished due to the change of the excitation frequency, the buckling beam repeats the process, so that the buckling beam energy collector realizes buckling self-adjustment and is more likely to generate the bistable state, more energy is collected, and the collected energy is greatly improved.
The buckling self-adjusting piezoelectric energy recovery device provided by the invention can automatically realize the matching of the natural frequency of the buckling beam with the external excitation frequency and generate the bistable phenomenon under certain conditions, and according to the principle that the rigidity of the buckling beam is lower than that of the piezoelectric actuator, the piezoelectric actuator enables the natural frequency of the buckling beam to be continuously changed or suddenly changed under the action of driving voltage, namely under the action of external excitation, if the buckling beam does not resonate or vibrate bistable state, the natural frequency of the buckling beam is gradually close to the excitation frequency by the piezoelectric actuator through the energy storage unit and the management unit of the device, and finally resonation or the bistable phenomenon is generated. Therefore, the buckling beam energy collector automatically adjusts the motion state of the buckling beam energy collector without external intervention and keeps high energy collection efficiency. The device has simple and reliable structure, when applied to vibration energy recovery, the buckling self-adjustment does not need to consume extra electric energy, and the buckling beam energy collector can generate resonance or bistable state under different excitation conditions, so the energy recovery efficiency is higher than that of the common buckling beam energy collecting device, and the collected electric energy can be stored or can supply power for elements such as a wireless sensor.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (6)
1. A buckling self-adjusting piezoelectric energy recovery device, characterized by: comprises an installation platform (1), and a primary adjusting mechanism (12), a first supporting seat (2) and a second supporting seat (3) which are arranged on the installation platform (1) in sequence; the two clamp assemblies are arranged between the first supporting seat (2) and the second supporting seat (3) and are symmetrical with each other; a buckling beam energy collector disposed between the clamp assemblies; the energy collecting-storing unit, the management unit controller and the driving circuit;
grooves are respectively arranged on the opposite end surfaces of the first supporting seat (2) and the second supporting seat (3), and piezoelectric actuators (4) are arranged in the grooves; the piezoelectric actuator (4) comprises a piezoelectric sheet (41) and an amplifying mechanism (42) which are mechanically stacked, the amplifying mechanism (42) is of a hollow cylinder structure, the piezoelectric sheet (41) is fixed in the middle of the amplifying mechanism (42) and integrated with the amplifying mechanism (42), and two fixing holes (43) are symmetrically arranged on the amplifying mechanism (42) relative to the axis of the piezoelectric sheet (41); one fixing hole is connected with the supporting seat through a screw, and the other fixing hole is fixedly connected with the first clamp (5) through a screw;
the clamp assembly comprises a first clamp (5), a second clamp (6) and a third clamp (7), wherein the first clamp (5) is connected with a fixing hole in the amplifying mechanism (42) through a screw; the second clamp (6) is fixed on the first clamp (5) through a screw, and the third clamp (7) is fixed on the second clamp (6) through a screw;
the buckling beam energy collector comprises a buckling beam (11) and a mass block (10); two ends of the bent beam (11) are respectively fixed between the second clamp (6) and the third clamp (7), and the mass block (10) is positioned in the middle of the bent beam (11); two auxiliary piezoelectric elements (9) and two main piezoelectric elements (8) are symmetrically arranged on the mass block (10), the main piezoelectric elements (8) are respectively and closely attached to the side surfaces of the bending beam (11) close to the two ends of the clamp, and the auxiliary piezoelectric elements (9) are respectively and closely attached to the side surfaces of the bending beam (11) close to the two sides of the mass block (10);
the primary adjustment mechanism (12) comprises a fixed block and an adjusting screw, the fixed block is arranged on the mounting table (1) on the side surface of the first support base (2), and the threaded end of the adjusting screw is matched with a counter bore in one end surface of the first support base (2);
the energy collecting-storing unit, the management unit controller and the driving circuit are installed on the installation platform (1), the management unit controller is connected with the auxiliary piezoelectric element (9), the installation platform (1) and the sensing element through leads respectively, the energy collecting-storing unit is connected with the main piezoelectric element (8) and the installation platform (1) through leads, the driving circuit is connected with the piezoelectric sheet (41) through leads, and the management unit controller, the energy collecting-storing unit and the driving circuit are connected with each other through leads.
2. A buckling self-adjusting piezoelectric energy recovery device as claimed in claim 1, wherein: the amplification mechanism (42) of the piezoelectric actuator (4) is not in contact with the groove side wall.
3. A buckling self-adjusting piezoelectric energy recovery device as claimed in claim 1, wherein: the first supporting base (2) and the second supporting base (3) are fixedly connected with a vibration source respectively.
4. A buckling self-adjusting piezoelectric energy recovery device as claimed in claim 1, wherein: the piezoelectric sheets in the piezoelectric actuator (4) are mechanically stacked, and deform under the action of voltage, and meanwhile, the amplification mechanism is driven to stretch and contract.
5. A buckling self-adjusting piezoelectric energy recovery device as claimed in claim 1, wherein: the bending beam (11) is made of metal materials, the rigidity of the bending beam in the motion direction is smaller than the rigidity of the piezoelectric actuator (4) in the stretching direction, the larger the stroke of the piezoelectric actuator is, the wider the bending horizontal change range of the bending beam (11) is, and the wider the natural frequency change range of the same bending beam (11) is; the initial state utilizes a first-adjustment mechanism to produce a flexion.
6. A buckling self-adjusting piezoelectric energy recovery device as claimed in claim 1, wherein: the energy collecting-storing unit is connected with the main piezoelectric element (8), the management unit controller is connected with the auxiliary piezoelectric element (9), the driving circuit is respectively connected with the piezoelectric actuators (4), and the two piezoelectric actuators (4) are connected in parallel.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112532107A (en) * | 2020-12-07 | 2021-03-19 | 上海大学 | Human body wearable energy collector based on piezoelectric stack and frequency modulation effect |
| CN114039506A (en) * | 2021-11-02 | 2022-02-11 | 上海交通大学 | Self-tuning piezoelectric energy collection device |
| CN114962519A (en) * | 2022-02-22 | 2022-08-30 | 上海大学 | Bistable nonlinear vibration absorber for inhibiting micro-amplitude vibration |
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| CN114962519B (en) * | 2022-02-22 | 2024-01-30 | 上海大学 | Bistable nonlinear vibration absorber for inhibiting micro-amplitude vibration |
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