CN204103801U - A kind of raising frequency formula vibrational energy acquisition system - Google Patents

A kind of raising frequency formula vibrational energy acquisition system Download PDF

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Publication number
CN204103801U
CN204103801U CN201420512080.4U CN201420512080U CN204103801U CN 204103801 U CN204103801 U CN 204103801U CN 201420512080 U CN201420512080 U CN 201420512080U CN 204103801 U CN204103801 U CN 204103801U
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China
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frequency
low
frequency resonant
resonant
vibration
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CN201420512080.4U
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Chinese (zh)
Inventor
刘会聪
陈涛
娄亮
孙立宁
王蓬勃
刘楠
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苏州大学
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Abstract

The utility model discloses a kind of raising frequency formula vibrational energy acquisition system, by low-frequency resonant structure induced environment vibration frequency, and by making high-frequency resonant structure realize self-excited vibration with the contact-impact of high-frequency resonant structure after low-frequency resonant structural vibration, to reach the object of raising frequency.Vibrated by the high-frequency of high-frequency resonant structure, make the piezoelectric material layer on dither beam produce cyclic stretching and compression, realize the Efficient Conversion of vibrational energy to electric energy, take into account high density and export and low operating frequency.The walking beam of low-frequency resonant structure has the lower rigidity of structure and larger tuned mass, and resonance frequency can be reduced to below 50Hz, sensitive to the induction of environmental vibration frequency, the scope of application is wider.

Description

A kind of raising frequency formula vibrational energy acquisition system
Technical field
The utility model belongs to micro-energy resource collecting technical field, is specifically related to a kind of raising frequency formula vibrational energy acquisition system.
Background technology
Vibrational energy in different forms, intensity and frequency be extensively present in the various productions such as bridge, building, boats and ships, vehicle, plant equipment, household electrical appliance and lifestyle device.Therefore carry out collection to vibrational energy to have a wide range of applications for the low power consuming devices such as radio sensing network, embedded system is powered.Such as, the vibration energy collector successful Application of Perpetuum company production is on the bearing monitoring of train wheel; The vibration energy collector of Ferro Solutions company is applied in the steamer of USN and the health monitoring of submarine.
In order to realize high efficiency energy collection, the design of vibrating type energy collector needs its natural frequency and ambient vibration source frequency to match, and requires wider working band to adapt to the change at random of vibration source frequency simultaneously.Research shows that the frequency of most vibration source is at below 200Hz, even lower than 50Hz.Current microminiature vibration energy collector often cannot be taken into account high density simultaneously and export and low operating frequency.Often operating frequency is also higher to have the energy acquisition device that higher-energy exports, and is difficult to realize energy high density when possessing lower operating frequency and exports.The high efficiency energy collection of research under low frequency vibration is the critical bottleneck problem of current microminiature vibrational energy acquisition technique.
Current microminiature vibration energy collector electricity under low-frequency vibration environment exports very low, cannot meet the power demands of low power consuming devices device.For the high density realizing low-frequency vibration exports, therefore need to carry out raising frequency process to original low-frequency vibration, existing raising frequency formula energy collecting device needs to assemble magnet in low frequency and high-frequency resonant structure, the conversion of low-frequency vibration to dither is realized by magnetic pull or repulsive force, but magnet area occupied is larger in this structure, structure is comparatively complicated, this microminiaturization for energy collecting device and the integrated proposition huge challenge of systematization.
Therefore, in view of above problem, be necessary to propose a kind of novel raising frequency formula energy collecting system, realize the sensitive induction to low-frequency vibration and Efficient Conversion, simplify the structure of acquisition system simultaneously, realize the microminiaturization of acquisition system and integrated.
Utility model content
In view of this, the utility model provides a kind of raising frequency formula vibrational energy acquisition system, by the contact-impact of low-frequency resonant structure and high-frequency resonant structure, high-frequency resonant structure is realized object that self-excited vibration reaches raising frequency, and by the tension and compression of piezoelectric material layer, realize the Efficient Conversion of vibrational energy to electric energy.The structure of this acquisition system is simple, is conducive to realizing the microminiaturization of acquisition system and integrated.
A kind of raising frequency formula vibrational energy acquisition system is proposed according to the purpose of this utility model, comprise high-frequency resonant structure and low-frequency resonant structure, described high-frequency resonant structure and described low-frequency resonant structure are fixedly installed at interval successively, described height, low-frequency resonant structure comprises fixed part respectively, mass, and be connected and fixed the walking beam of parts and mass, dither beam surface is disposed with bottom electrode layer, piezoelectric material layer and top electrode layer, described high-frequency resonant structure and the interstructural spacing of described low-frequency resonant are less than the vibration amplitude of low frequency resonance structure under given vibrational excitation.
Preferably, described high-frequency resonant structure and described low-frequency resonant parallelism structural are arranged.
Preferably, the walking beam of described low-frequency resonant structure is straight beam, single S type or many S type cantilever beam.
Preferably, described high-frequency resonant vibrational power flow in described low-frequency resonant structure side, or is symmetricly set in the both sides of described low-frequency resonant structure.
Preferably, described piezoelectric material layer is piezoelectric membrane or piezoelectric thick.
Compared with prior art, disclosed in the utility model, the advantage of raising frequency formula vibrational energy acquisition system is: by low-frequency resonant structure induced environment vibration frequency, and by making high-frequency resonant structure realize self-excited vibration with the contact-impact of high-frequency resonant structure after low-frequency resonant structural vibration, to reach the object of raising frequency.
Vibrated by the high-frequency of high-frequency resonant structure, make the piezoelectric material layer on dither beam produce cyclic stretching and compression, realize the Efficient Conversion of vibrational energy to electric energy, take into account high density and export and low operating frequency.
The walking beam of low-frequency resonant structure has the lower rigidity of structure and larger tuned mass, and resonance frequency can be reduced to below 50Hz, sensitive to the induction of environmental vibration frequency, the scope of application is wider.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of high-frequency resonant structure.
Fig. 2 is the sectional view of high-frequency resonant structure.
The structural representation of Fig. 3 low-frequency resonant structure disclosed in the utility model.
Fig. 4 is the structural representation of vibrational energy acquisition system.
Fig. 5 is primary collision state diagram.
Fig. 6 is cooperative motion state diagram.
Fig. 7 is non-fully elasticity release condition figure.
Fig. 8 is the output voltage wave figure of high-frequency resonant structure.
The title of the numeral in figure or the corresponding component representated by letter:
1, high-frequency resonant structure 2, low-frequency resonant mechanism 3, fixed part 4, walking beam 5, mass 11, bottom electrode layer 12, piezoelectric material layer 13, top electrode layer
Embodiment
Current microminiature vibration energy collector electricity under low-frequency vibration environment exports very low, cannot meet the power demands of low power consuming devices device.For the high density realizing low-frequency vibration exports, therefore need to carry out raising frequency process to original low-frequency vibration, existing raising frequency formula energy collecting device needs to assemble magnet in low frequency and high-frequency resonant structure, the conversion of low-frequency vibration to dither is realized by magnetic pull or repulsive force, but magnet area occupied is larger in this structure, structure is comparatively complicated, this microminiaturization for energy collecting device and the integrated proposition huge challenge of systematization.
The utility model is for deficiency of the prior art, provide a kind of raising frequency formula vibrational energy acquisition system, by the contact-impact of low-frequency resonant structure and high-frequency resonant structure, high-frequency resonant structure is made to realize self-excited vibration to reach the object of raising frequency, and by the tension and compression of piezoelectric material layer, realize the Efficient Conversion of vibrational energy to electric energy, the structure of this acquisition system is simple, realizes the microminiaturization of acquisition system and integrated.
To be clearly and completely described the technical solution of the utility model by embodiment below.Obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Please also refer to Fig. 1 to Fig. 7, a kind of raising frequency formula vibrational energy acquisition system, comprise high-frequency resonant structure 1 and low-frequency resonant structure 2, high-frequency resonant structure 1 and low-frequency resonant structure 2 are fixedly installed at interval successively, high-frequency resonant parallelism structural and the upper and lower sides being arranged at low-frequency resonant structure of symmetry, and high-frequency resonant structure and the interstructural spacing of low-frequency resonant are less than the vibration amplitude of low frequency resonance structure under given vibrational excitation.Low-frequency resonant structure can respond to the vibration frequency of external environment condition, and produces resonance with it, by low-frequency resonant structure and high-frequency resonant structure Contact by vibration passing to high-frequency resonant structure, high-frequency resonant structure realizes self-excited vibration, reaches the object of raising frequency.Wherein high-frequency resonant structure can be arranged at the either side of low-frequency resonant structure or be symmetricly set in both sides, and concrete mode does not limit.
High and low frequency resonance structure comprises fixed part 3 respectively, mass 5, and be connected and fixed the walking beam 4 of parts and mass, the walking beam surface of high-frequency resonant structure is disposed with bottom electrode layer 11, piezoelectric material layer 12 and top electrode layer 13, by being coated with piezoelectric material layer on the surface of dither beam, the periodic reverse motion of dither beam can cause cyclic stretching and the compression of piezoelectric material layer, based on piezoelectric effect, changes mechanical energy can be realized effectively transform to electric energy, take into account the advantage that low operating frequency and high density export.
High-frequency resonant structure 1 is silica-based cantilever beam.Wherein, piezoelectric material layer can be piezoelectric membrane or piezoelectric thick.Coordinate by piezoelectric membrane and walking beam the collection realizing vibrational energy, effectively simplify the structure of acquisition system, be conducive to microminiaturization and the integrated level of acquisition system.
The walking beam of low-frequency resonant structure is the two S type cantilever beam of polymeric material.This cantilever beam has the lower rigidity of structure and larger tuned mass, and be convenient to the vibration responding low frequency environments, and resonate with the vibration of external environment condition, resonance frequency can be reduced to below 50Hz, and sensitive to the induction of environmental vibration frequency, the scope of application is wider.High-frequency resonant structure and low-frequency resonant mechanism all can adopt micro Process means to prepare.
Wherein polymeric material can be rubber, resin or plastics etc., as polyimides (Polymide), dimethyl silicone polymer (PDMS), polyvinylidene fluoride (PVDF), Parylene (Parylene), PETG (PET) etc.The walking beam of low-frequency resonant structure also can adopt silica-base material to prepare.The planform of low-frequency vibration beam and material can be selected according to vibration frequency value to be collected, and generally can be straight beam, single S type or many S type cantilever beam etc., concrete structure does not limit.
Based on an acquisition method for raising frequency formula vibrational energy acquisition system, concrete steps are as follows:
S1: high-frequency resonant structure and low-frequency resonant structure are fixedly installed up and down, high-frequency resonant structure can be arranged at the upper and lower both sides of low-frequency resonant structure or side, and high-frequency resonant structure and the interstructural spacing of low-frequency resonant are less than the vibration amplitude of low frequency resonance structure under given vibrational excitation;
S2: initial contact, under extraneous vibrational excitation, the walking beam of low-frequency resonant structure swings, and from horizontal level to upside or lower side oscillation, produces contact with the walking beam of high-frequency resonant structure;
S3: cooperative motion, low frequency contacts with the walking beam of high frequency and is coupled and moves to side highest position together;
S4: non-fully elasticity discharges, low frequency counter motion together with the walking beam of high frequency afterwards, the walking beam of high frequency starts the release of non-fully elasticity occurs, produce self-excited vibration, the walking beam of low frequency continues motion and contacts with another dither beam, is realized the self-excited vibration of another dither beam by contact;
S5: the periodic reverse motion of dither beam can cause cyclic stretching and the compression of piezoelectric material layer, based on piezoelectric effect, realizes vibrational energy and exports to electric transformation of energy.
Refer to Fig. 5 to Fig. 7, raising frequency principle is as follows:
Low-frequency resonant structure in system has the lower rigidity of structure and larger tuned mass.High-frequency resonant structure, in the both ends or one end up and down of low-frequency resonant structure, has the higher rigidity of structure and less tuned mass.Assembling accurately will control the vibration amplitude that high and low frequency resonance structure gap is less than low frequency resonance structure under given vibrational excitation.For half harmonic period of a low-frequency vibration beam, the collision process of low frequency and dither beam experienced by initial contact (Fig. 5), cooperative motion (Fig. 6) and non-fully elasticity release (Fig. 7) process.Under extraneous vibrational excitation, when low-frequency vibration beam moves to position 2 from position 1, contact-impact is to the dither beam (Fig. 5) of upper end.Since then, low frequency contacts with dither beam and is coupled and moves to extreme higher position 3 (Fig. 6) from position 2 together, then moves downward position 4 together.Now, start the release of non-fully elasticity occurs, low-frequency vibration beam moves downward position 1 by continuing, and d/d dither beam then starts self-excited vibration under its resonance frequency (Fig. 7).When low-frequency vibration beam continues to move to position 1, start the dither beam of contact-impact to lower end.In like manner, the self-excited vibration of lower end dither beam is realized by contact-impact.The method is based on achieving energy collecting device under collision effect in the effective conversion of low-frequency ambient vibrations to radio frequency system self-excited vibration.
Embodiment
In previous work, experimental work is done to the piezoelectric energy acquisition system based on collision raising frequency mechanism, prepared low frequency and high frequency piezo micro-structural beam by the silica-based technique of MEMS.High and low frequency resonance beam chip size in experiment is 5.2mm*4.2mm*0.4mm.Low-frequency vibration beam adopts two S type design resonance frequency can be reduced to 20Hz.Dither beam resonance frequency is 127Hz, and surface is coated with piezoelectric thin film layer, by piezoelectric effect, mechanical energy is converted to electric energy and exports.Fig. 8 is the test result of the output voltage wave figure of low-and high-frequency resonance structure, the voltage of high-frequency resonant beam (127Hz) exports and exports higher than the voltage of low-frequency resonant beam (20Hz) far away as seen from the figure, effectively realizes the object that low frequency height exports.
The utility model discloses a kind of raising frequency formula vibrational energy acquisition system, by low-frequency resonant structure induced environment vibration frequency, and by making high-frequency resonant structure realize self-excited vibration with the contact-impact of high-frequency resonant structure after low-frequency resonant structural vibration, to reach the object of raising frequency.
Vibrated by the high-frequency of high-frequency resonant structure, make the piezoelectric material layer on dither beam produce cyclic stretching and compression, realize the Efficient Conversion of vibrational energy to electric energy, take into account high density and export and low operating frequency.
The walking beam of low-frequency resonant structure has the lower rigidity of structure and larger tuned mass, and resonance frequency can be reduced to below 50Hz, sensitive to the induction of environmental vibration frequency, the scope of application is wider.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (5)

1. a raising frequency formula vibrational energy acquisition system, it is characterized in that, comprise high-frequency resonant structure and low-frequency resonant structure, described high-frequency resonant structure and described low-frequency resonant structure are fixedly installed at interval successively, described height, low-frequency resonant structure comprises fixed part respectively, mass, and be connected and fixed the walking beam of parts and mass, dither beam surface is disposed with bottom electrode layer, piezoelectric material layer and top electrode layer, described high-frequency resonant structure and the interstructural spacing of described low-frequency resonant are less than the vibration amplitude of low frequency resonance structure under given vibrational excitation.
2. raising frequency formula vibrational energy acquisition system as claimed in claim 1, it is characterized in that, described high-frequency resonant structure and described low-frequency resonant parallelism structural are arranged.
3. raising frequency formula vibrational energy acquisition system as claimed in claim 1, it is characterized in that, the walking beam of described low-frequency resonant structure is straight beam, single S type or many S type cantilever beam.
4. raising frequency formula vibrational energy acquisition system as claimed in claim 1, it is characterized in that, described high-frequency resonant vibrational power flow in described low-frequency resonant structure side, or is symmetricly set in the both sides of described low-frequency resonant structure.
5. raising frequency formula vibrational energy acquisition system as claimed in claim 1, it is characterized in that, described piezoelectric material layer is piezoelectric membrane or piezoelectric thick.
CN201420512080.4U 2014-09-05 2014-09-05 A kind of raising frequency formula vibrational energy acquisition system CN204103801U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104158440A (en) * 2014-09-05 2014-11-19 苏州大学 Frequency-raising type vibration energy collecting system and collecting method
CN104935209A (en) * 2015-06-10 2015-09-23 南方科技大学 Piezoelectric energy collector and piezoelectric energy collection method
CN107873120A (en) * 2015-06-11 2018-04-03 天津威盛电子有限公司 Piezo vibration module
CN108847784A (en) * 2018-06-29 2018-11-20 安徽工程大学 A kind of low-frequency vibration two degrees of freedom piezo-electricity energy harvester
CN109306945A (en) * 2018-10-18 2019-02-05 洛阳理工学院 A kind of adjustable monoblock type raising frequency pendulum energy collection device of rigid sheet amount of bow

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104158440A (en) * 2014-09-05 2014-11-19 苏州大学 Frequency-raising type vibration energy collecting system and collecting method
CN104935209A (en) * 2015-06-10 2015-09-23 南方科技大学 Piezoelectric energy collector and piezoelectric energy collection method
CN107873120A (en) * 2015-06-11 2018-04-03 天津威盛电子有限公司 Piezo vibration module
CN107873120B (en) * 2015-06-11 2020-04-24 天津威盛电子有限公司 Piezoelectric vibration module
CN108847784A (en) * 2018-06-29 2018-11-20 安徽工程大学 A kind of low-frequency vibration two degrees of freedom piezo-electricity energy harvester
CN109306945A (en) * 2018-10-18 2019-02-05 洛阳理工学院 A kind of adjustable monoblock type raising frequency pendulum energy collection device of rigid sheet amount of bow

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