CN105391343A - Acoustic energy recycling device - Google Patents
Acoustic energy recycling device Download PDFInfo
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- CN105391343A CN105391343A CN201510666399.1A CN201510666399A CN105391343A CN 105391343 A CN105391343 A CN 105391343A CN 201510666399 A CN201510666399 A CN 201510666399A CN 105391343 A CN105391343 A CN 105391343A
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- acoustic energy
- retracting device
- line defect
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- energy retracting
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- 238000004064 recycling Methods 0.000 title abstract 4
- 230000007547 defect Effects 0.000 claims abstract description 57
- 230000004807 localization Effects 0.000 claims abstract description 12
- 239000013078 crystal Substances 0.000 claims description 71
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 25
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 20
- 239000002033 PVDF binder Substances 0.000 claims description 14
- 239000012528 membrane Substances 0.000 claims description 6
- 230000000737 periodic effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000004038 photonic crystal Substances 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000009776 industrial production Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- 230000001413 cellular effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
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- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention relates to an acoustic energy recycling device. According to the acoustic energy recycling device, a linear defect is constructed in a two-dimensional photonic crystal for realizing sound wave localization. Furthermore a piezoelectric cantilever beam array is placed into the two-dimensional photonic crystal as an energy converter for converting the acoustic energy to electric energy. Compared with the prior art, the acoustic energy recycling device has advantages of simple structure, convenient manufacture, etc.
Description
Technical field
The present invention relates to energy recycle device technical field, especially relate to a kind of acoustic energy retracting device.
Background technology
In recent years, microelectromechanical-systems, wireless senser are widely used, and its power supply is many to be supplied by chemical cell, need periodic replacement, and maintenance cost is high and cause the permanent pollution of environment.Reclaim the energy in environment, converting thereof into electric energy thus powering for wireless devices is the good plan solved the problem, and the research of this respect causes the concern of numerous scholar.Compared with the environmental energy such as solar energy, wind energy, vibrational energy, the research of reclaiming for acoustic energy in environment is relatively less.Acoustic energy is a kind of extensively existence, and the green sound source of sustainable acquisition, not by the condition such as weather, environment variable effect.Effectively being reclaimed by the huge acoustic energy contained in environment, for self-powered sensor provides reliable energy source, builds healthy acoustic enviroment etc., is the needs meeting the micro-energy strategy development in the fields such as industrial production, environmental monitoring, space flight military project.
Phonon crystal is a kind of new function material with periodic structure, and the vibration good due to it and filtering characteristic, cause Chinese scholars and pay close attention to greatly.Phonon crystal can utilize the fundamental characteristics (as scattering, interference) of ripple and the locally resonant characteristic of structure, forms complete forbidden band at some frequency band range, stops the ripple of these frequency bands in the structure to the propagation of all directions.Different according to band gap mechanism of production, phonon crystal is divided into two kinds: Bragg scatter-type phonon crystal and local resonance type phonon crystal.For Bragg scatter-type phonon crystal, suitably introduce point defect or line defect, just can form resonant cavity or the waveguide of high q-factor in the structure, its this characteristic makes it have the potential advantages be applied in various device and device.
At present, acoustic energy retracting device mainly contains two kinds.One is utilize Helmholz resonance principle, and a certain frequency sound waves produces resonance in resonator, excites the piezoelectric material vibration implanted in resonant cavity, completes the conversion of acoustic energy to electric energy; Two is utilize Bragg scatter-type phonon crystal band gap mechanism, makes the sound wave of a certain frequency be gathered in point defect (resonant cavity) place, utilizes the piezoelectric implanting resonant cavity to reclaim acoustic energy simultaneously.Above-mentioned two kinds of devices due to available inner space limited, be difficult to place greater number, multi-form PZT (piezoelectric transducer), reduce the acoustic energy recovering effect of structure.
Summary of the invention
Object of the present invention is exactly provide a kind of structure simple, easily manufactured to overcome defect that above-mentioned prior art exists, can be used for the acoustic energy retracting device reclaiming the ambient noise produced in industrial production, construction, communications and transportation and social life.
Object of the present invention can be achieved through the following technical solutions: a kind of acoustic energy retracting device, and this acoustic energy retracting device structural line defect in two-dimension phonon crystal, can realize the localization of sound wave, and the acoustic pressure namely realizing sound regional area is amplified, acoustic energy focusing; And in described two-dimension phonon crystal, insert piezoelectric cantilever array serve as transducer, can be used for reclaiming industrial production, urban environment noise that road traffic, construction bring, realize the conversion of acoustic energy to electric energy.
Described two-dimension phonon crystal is formed by several two-dimensional crystal lattice unit periodic arrangement, and described two-dimensional crystal lattice unit is arranged according to two-dimensional crystal lattice in atmosphere by the acrylic cylinder be parallel to each other and forms.
The arrangement architecture of described two-dimensional crystal lattice unit is the plane geometric figures such as square, rectangle, triangle or hexagon, preferably square.
The shape of cross section of described acrylic cylinder is circular, square, rectangle or triangle etc., circular.
Described acrylic density of pillars is ρ
pMMA=1190kg/m
3, longitudinal wave velocity is c
pMMA=2694m/s, the density of air is ρ
air=1.2kg/m
3, longitudinal wave velocity is c
air=343m/s.
Described line defect is formed by a certain row acrylic cylinder removed in two-dimensional crystal lattice unit, further, described line defect is formed by any row acrylic cylinder except first row and last row removed in two-dimensional crystal lattice unit, preferably removes the row acrylic cylinder in two-dimensional crystal lattice unit on geometirc symmetry axis.
Described line defect is formed by the row acrylic cylinder removed in two-dimensional crystal lattice unit on symmetry axis.
Described piezoelectric cantilever beam array is equidistantly arranged by a row piezoelectric cantilever be arranged on line defect axial plane and forms, and usual piezoelectric cantilever is arranged on the axis of line defect with " one " font.
Described piezoelectric cantilever is the materials such as piezoelectric monocrystal sheet, piezoelectric bimorph or PVDF piezoelectric membrane; Described piezoelectric cantilever shape is rectangle, isosceles trapezoid or triangle etc.Described piezoelectric cantilever preferred rectangle PVDF piezoelectric film cantilever beam, the density of described PVDF piezoelectric membrane is ρ
pVDF=1780kg/m
3, Young's modulus of elasticity is E
pVDF=3.5Gpa, Poisson's ratio is v
pVDF=0.3,31 mode lower piezoelectric constants are d
31=23pC/N, 33 mode lower piezoelectric constants are d
33=33pC/N.
The sound localization effect of two-dimension phonon crystal line defect mainly affects by following factor: the physical parameter such as mass density, elastic constant of component medium; The geometry of filled media, volume fraction and arrangement orientation; The arrangement architecture of two-dimensional crystal lattice unit; The implantation position of line defect; Piezoelectric crystal structure and arrangement form.By regulate and change above-mentioned factor can obtain meet frequency requirement, the line defect two-dimension phonon crystal of the recovery acoustic energy with good sound localization effect.
The pillar array that two-dimension phonon crystal mostly is axis being parallel is arranged in background media and is formed, two-dimension phonon crystal has Multicomponent material, for improving the sound localization effect at two-dimension phonon crystal line defect place, the bi-material that should acoustic impedance be adopted as far as possible to differ greatly.
Compared with prior art, the present invention has the following advantages:
(1) the application is by structural line defect in two-dimension phonon crystal, can realize the localization of sound wave, and the acoustic pressure namely realizing sound regional area is amplified, acoustic energy focusing;
(2) the application adopts piezo technology, namely line defect mid-enter piezoelectric cantilever beam array, can be used for the urban environment noise reclaiming industrial production, road traffic, construction bring, realize the conversion of acoustic energy to electric energy;
(3) the acoustic energy retracting device structure of the present application is simple, easily manufactured.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of acoustic energy retracting device of the application;
Fig. 2 is the two-dimension phonon crystal structure schematic diagram of the application;
Fig. 3 for based on 1 × 7 surpass cellular to calculate the two-dimension phonon crystal band structure figure in X direction obtained;
Fig. 4 be the line defect two-dimension phonon crystal of structure and scale 7 × 7 under the first defect mid-band frequency is 3499Hz acoustic wave excitation, the sound-filed simulation figure of line defect two-dimension phonon crystals;
Fig. 5 be the line defect two-dimension phonon crystal of structure and scale 7 × 7 under the first defect mid-band frequency is 3499Hz acoustic wave excitation, the distribution map of line defect two-dimension phonon crystals acoustic pressure gradient field;
Fig. 6 is the Changing Pattern oscillogram of open circuit voltage with incident acoustic wave frequency of the line defect two-dimension phonon crystals PVDF piezoelectric cantilever of different filling rate.
Be designated in figure: 1 acrylic cylinder, 2 piezoelectric cantilevers, 3 incident acoustic waves, 4 use electric device.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
Be illustrated in figure 1 a kind of acoustic energy retracting device of the application, this acoustic energy retracting device structural line defect in two-dimension phonon crystal, can realize the localization of sound wave, and the acoustic pressure namely realizing sound regional area is amplified, acoustic energy focusing; And in two-dimension phonon crystal, insert piezoelectric cantilever array serve as transducer, can be used for reclaiming industrial production, urban environment noise that road traffic, construction bring, realize the conversion of acoustic energy to electric energy.
The sound localization effect of two-dimension phonon crystal line defect mainly affects by following factor: the physical parameter such as mass density, elastic constant of component medium; The geometry of filled media, volume fraction and arrangement orientation; The arrangement architecture of two-dimensional crystal lattice unit; The implantation position of line defect; Piezoelectric crystal structure and arrangement form.By regulate and change above-mentioned factor can obtain meet frequency requirement, the line defect two-dimension phonon crystal of the recovery acoustic energy with good sound localization effect.
Two-dimension phonon crystal is formed by several two-dimensional crystal lattice unit periodic arrangement, two-dimension phonon crystal has Multicomponent material, for improving the sound localization effect at two-dimension phonon crystal line defect place, the bi-material that should acoustic impedance be adopted as far as possible to differ greatly, the pillar array that two-dimensional crystal lattice unit mostly is axis being parallel is arranged in background media and is formed, adopt the acrylic cylinder 1 be parallel to each other to form two-dimensional crystal lattice unit according to two-dimensional crystal lattice arrangement in atmosphere in the application, structure and material is comparatively reasonable.
The arrangement architecture of two-dimensional crystal lattice unit is the plane geometric figures such as square, rectangle, triangle or hexagon, preferably square.
The shape of cross section of acrylic cylinder 1 is circular, square, rectangle or triangle etc., circular.
Acrylic cylinder 1 density is ρ
pMMA=1190kg/m
3, longitudinal wave velocity is c
pMMA=2694m/s, the density of air is ρ
air=1.2kg/m
3, longitudinal wave velocity is c
air=343m/s.
Line defect is formed by a certain row acrylic cylinder 1 removed in two-dimensional crystal lattice unit, further, line defect is formed by any row acrylic cylinder 1 except first row and last row removed in two-dimensional crystal lattice unit, preferably removes the row acrylic cylinder 1 in two-dimensional crystal lattice unit on geometirc symmetry axis.
Line defect is formed by the row acrylic cylinder 1 removed in two-dimensional crystal lattice unit on symmetry axis.
The piezoelectric cantilever 2 that piezoelectric cantilever beam array is arranged on line defect axial plane by row equidistantly arranges and forms, and usual piezoelectric cantilever 2 is arranged on the axis of line defect with " one " font.
Piezoelectric cantilever 2 is the materials such as piezoelectric monocrystal sheet, piezoelectric bimorph or PVDF piezoelectric membrane; Piezoelectric cantilever 2 shape is rectangle, isosceles trapezoid or triangle etc.Described piezoelectric cantilever 2 is rectangle PVDF piezoelectric film cantilever beam preferably, and the density of described PVDF piezoelectric membrane is ρ
pVDF=1780kg/m
3, Young's modulus of elasticity is E
pVDF=3.5Gpa, Poisson's ratio is v
pVDF=0.3,31 mode lower piezoelectric constants are d
31=23pC/N, 33 mode lower piezoelectric constants are d
33=33pC/N.
According to above-mentioned theory, the present embodiment adopts cross section to be that (density of acrylic is ρ to circular acrylic cylinder 1
pMMA=1190kg/m
3, longitudinal wave velocity is c
pMMA=2694m/s), (density of air is ρ in atmosphere
air=1.2kg/m
3, longitudinal wave velocity is c
air=343m/s) form two-dimensional crystal lattice unit by square lattice arrangement, lattice constant is a=39mm.Acrylic cylinder 1 is 7 layers, and constructs line defect by removing the 4th row acrylic cylinder 1.
Piezoelectric cantilever 2 adopts rectangle PVDF piezoelectric membrane, and is equidistantly arranged along line defect axis by 7 PVDF piezoelectric cantilevers 2, forms " one " font piezoelectric cantilever beam array (as shown in Figure 2).
The present embodiment utilizes the localization effect to sound wave under defect frequency of two-dimension phonon crystal line defect, incident acoustic wave 3 in a certain special frequency channel is accumulated in line defect both sides, form loud nip, and high sound pressure gradient zones is formed in line defect centre position, the PVDF piezoelectric cantilever 2 of inserting in line defect is encouraged to do forced vibration with this, convert acoustic energy to electric energy, for electric device 4.Fig. 3 for based on 1 × 7 surpass cellular to calculate the two-dimension phonon crystal band structure figure in X direction obtained, its acoustic propagation forbidden band scope is 2234Hz to 6311Hz, two strip defect frequency bands have been there are in its forbidden band, centre frequency is respectively 3499Hz and 5715Hz, and the sound wave in this frequency band range can penetrate phonon crystal.Fig. 4 and Fig. 5 is respectively the line defect two-dimension phonon crystal of structure and scale 7 × 7 under the first defect mid-band frequency is 3499Hz acoustic wave excitation, the acoustic pressure of line defect two-dimension phonon crystals and acoustic pressure gradient cloud charts, can find out, sound wave is limited in line defect both sides, form loud nip, distribute in phase-inversion symmetric, on line defect axis, sound pressure amplitude is lower on the contrary; Contrary with the sound pressure amplitude regularity of distribution, acoustic pressure gradient demonstrates larger amplitude at line defect near axis, PVDF piezoelectric cantilever 2 can be encouraged to vibrate with this, produces electric energy.
Fig. 6 is the Changing Pattern oscillogram of open circuit voltage with incident acoustic wave frequency of the line defect two-dimension phonon crystals PVDF piezoelectric cantilever 2 of different filling rate, can find out, the two-dimensional line defect phonon crystal of different filling rate has different defect frequencies, crest voltage has all been there is in defect frequency place separately at it, there is good acoustic-electric changing effect, the line defect two-dimension phonon crystal that wherein filling rate is larger PVDF piezoelectric cantilever 2 therein can obtain larger open circuit voltage.
Embodiment 2
The shape of cross section of the acrylic cylinder 1 that the present embodiment adopts is square, and two-dimensional crystal lattice unit arrangement structure is hexagon, and all the other are with embodiment 1.
Embodiment 3
The shape of cross section of the acrylic cylinder 1 that the present embodiment adopts is triangle, and two-dimensional crystal lattice unit arrangement structure is triangle, and all the other are with embodiment 1.
Claims (9)
1. an acoustic energy retracting device, is characterized in that, this acoustic energy retracting device structural line defect in two-dimension phonon crystal, realizes acoustic localization, and in described two-dimension phonon crystal, inserts piezoelectric cantilever array serve as transducer, converts acoustic energy to electric energy.
2. a kind of acoustic energy retracting device according to claim 1, it is characterized in that, described two-dimension phonon crystal is formed by several two-dimensional crystal lattice unit periodic arrangement, and described two-dimensional crystal lattice unit is arranged according to two-dimensional crystal lattice in atmosphere by the acrylic cylinder (1) be parallel to each other and forms.
3. a kind of acoustic energy retracting device according to claim 2, is characterized in that, the arrangement architecture of described two-dimensional crystal lattice unit is square, rectangle, triangle or hexagon.
4. a kind of acoustic energy retracting device according to claim 2, is characterized in that, the shape of cross section of described acrylic cylinder (1) is circular, square, rectangle or triangle.
5. a kind of acoustic energy retracting device according to claim 1, is characterized in that, described line defect is consisted of any row acrylic cylinder (1) removed in two-dimensional crystal lattice unit except first row and last row.
6. a kind of acoustic energy retracting device according to claim 5, is characterized in that, described line defect is formed by the row acrylic cylinder (1) removed in two-dimensional crystal lattice unit on geometirc symmetry axis.
7. a kind of acoustic energy retracting device according to claim 1, is characterized in that, the piezoelectric cantilever (2) that described piezoelectric cantilever beam array is arranged on line defect axial plane by row equidistantly arranges and forms.
8. a kind of acoustic energy retracting device according to claim 7, is characterized in that, described piezoelectric cantilever (2) is piezoelectric monocrystal sheet, piezoelectric bimorph or PVDF piezoelectric membrane.
9. a kind of acoustic energy retracting device according to claim 7, is characterized in that, the shape of described piezoelectric cantilever (2) is rectangle, isosceles trapezoid or triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510666399.1A CN105391343A (en) | 2015-10-15 | 2015-10-15 | Acoustic energy recycling device |
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| CN201510666399.1A CN105391343A (en) | 2015-10-15 | 2015-10-15 | Acoustic energy recycling device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130403A (en) * | 2016-07-11 | 2016-11-16 | 武汉理工大学 | A kind of composite line defect phonon crystal wide frequency division cloth vibration energy regeneration system |
| CN106941327A (en) * | 2017-03-31 | 2017-07-11 | 国网江西省电力公司电力科学研究院 | It is a kind of to be used for except the Piezoelectric anisotropy phonon crystal plate for generating of making an uproar |
| CN108859594A (en) * | 2018-04-26 | 2018-11-23 | 华东交通大学 | A kind of High Speed Railway Trains wheel vibration absorber based on phonon crystal |
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Cited By (5)
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|---|---|---|---|---|
| CN106130403A (en) * | 2016-07-11 | 2016-11-16 | 武汉理工大学 | A kind of composite line defect phonon crystal wide frequency division cloth vibration energy regeneration system |
| CN106941327A (en) * | 2017-03-31 | 2017-07-11 | 国网江西省电力公司电力科学研究院 | It is a kind of to be used for except the Piezoelectric anisotropy phonon crystal plate for generating of making an uproar |
| CN106941327B (en) * | 2017-03-31 | 2019-05-21 | 国网江西省电力公司电力科学研究院 | A kind of Piezoelectric anisotropy phonon crystal plate for except power generation of making an uproar |
| CN108859594A (en) * | 2018-04-26 | 2018-11-23 | 华东交通大学 | A kind of High Speed Railway Trains wheel vibration absorber based on phonon crystal |
| CN108859594B (en) * | 2018-04-26 | 2021-09-28 | 华东交通大学 | High-speed railway train wheel bump leveller based on phononic crystal |
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