CN208507178U - A kind of broadband sound insulation property flexibility frequency acoustic metamaterial structure - Google Patents
A kind of broadband sound insulation property flexibility frequency acoustic metamaterial structure Download PDFInfo
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- CN208507178U CN208507178U CN201821191247.6U CN201821191247U CN208507178U CN 208507178 U CN208507178 U CN 208507178U CN 201821191247 U CN201821191247 U CN 201821191247U CN 208507178 U CN208507178 U CN 208507178U
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Abstract
The utility model belongs to low-frequency noise control technology field, and in particular to a kind of broadband sound insulation property flexibility frequency acoustic metamaterial structure, including grid framework, film covering, the first thin slice and the second thin slice；The grid framework is formed by individual unit lattice through two-dimensional and periodic continuation；Film covering is covered in the side of grid framework；First thin slice and the second thin slice are distributed in the cell of grid framework, are placed in the surface of film covering.The utility model structural unit and low-frequency sound wave interact, and show multiple anti_resonance phenomena, so that its ensemble average Normal Displacement is almost nil or even is negative, high sound insulation property is realized in broadband.
Description
Technical field
The utility model relates to a kind of broadband sound insulation property flexibility frequency acoustic metamaterial structures, have big bandwidth, high sound insulation
Performance belongs to low-frequency noise control technology field.
Background technique
Statistics shows the failure of vehicle 1/3 all and auto NVH (noise, vibration with ride comfort) problem is related.Especially
It is that interior low frequency (600 Hz of <) noise is prominent, penetration power is strong, and harmfulness is big, and general acoustics material can not be solved effectively again
Certainly.According to mass law of sound insulation:STL=20lg(m s )+20lg(f) -47, (STLFor sound transmission loss, the sound insulation energy of material is characterized
Power, dB；m s For the surface density of material, the quality in material unit area, kg/m are characterized2；fFor acoustic wave excitation frequency, Hz.), it can
Know: to obtain preferable sound insulation property in low-frequency range, being bound to use thick and weight acoustical material, it is clear that this does not meet
The lightening design principle of automotive upholstery.Therefore, interior low-frequency noise handles problem, is so far still a technical problem.
Acoustic metamaterial is a kind of artificial composite structure with extraordinary acoustic properties not available for natural acoustical material
Or composite material, it is important one of the developing direction of frequency acoustic Material Field.Correlation theory is research shows that acoustic metamaterial can
Regulate and control big wavelength (low frequency) elastic wave within the scope of small scale structures, future will can be widely applied to automobile, aerospace, boat
Sea, life etc. fields, be in recent years involved in a kind of key investigative technique.Frequency acoustic Meta Materials are in practical engineering application
In face the requirement such as low frequency, broadband, lightweight, flexibility, durability, still turn to the application study stage in theoretical research in industry.
Current acoustic Meta Materials there are the drawbacks of be: sound insulation frequency it is not low enough；Bandwidth is not wide enough；Structure is complicated, thick and heavy, hard, unsuitable
Machine-shaping and lightweight application.Therefore, frivolous one kind, broadband, flexible frequency acoustic Meta Materials are designed, it will be with important reality
Border engineering application value.
Summary of the invention
The purpose of this utility model is designed a kind of with frivolous, flexible structure the drawbacks of evading existing acoustic metamaterial
The broadband sound insulation property frequency acoustic metamaterial structure of feature widens sound insulation frequency band, promotes sound insulation amplitude, so as to improve sound insulation room
Characteristic.
According to the technical solution of the utility model, the broadband sound insulation property flexibility frequency acoustic metamaterial structure, including lattice
Grid frame, film covering, the first thin slice and the second thin slice；The grid framework by individual unit lattice through two-dimensional and periodic continuation and
At；Film covering is covered in the side of grid framework；First thin slice and the second thin slice are distributed in the cell of grid framework, are set
In the surface of film covering.
Further, the grid framework, the first thin slice and the second thin slice are fixed on the ipsilateral or different of film skin-surface
Side.
Further, the individual unit lattice of the grid framework, single first thin slice, four the second thin slices and film cover
One minimum period unit of skin composition sound insulation property flexibility frequency acoustic metamaterial structure.
Further, the grid framework includes a plurality of bar shaped skeleton to intersect vertically in length and breadth；The each unit of grid framework
Lattice are square frame structure, and side length a is 30-140mm, width w3 is 4-20mm, and thickness h 3 is 1-5mm.
Further, the grid framework is made of ethylene-vinyl acetate copolymer or ethylene propylene diene monomer (EPDM) material.
Further, the thickness h 4 of the film covering is 0.05-0.5mm, by polyimides, polyethylene, is gathered to benzene two
Formic acid glycol ester, nylon or silastic material are made.
Further, first thin slice be cross, the second thin slice be circle, the second thin slice be distributed in the first thin slice with
Between grid framework.
Further, the two-arm of first thin slice intersects vertically, and the length w1 of every arm is 20-80mm, and width w2 is
2-8mm, thickness h 1 are 1-5mm；First thin slice is by ethylene-vinyl acetate copolymer, ethylene propylene diene rubber or acrylic material system
At.
Further, the radius r of second thin slice is 2-8mm, and thickness h 2 is 1-5mm；Second thin slice is by iron, aluminium, Asia
Gram force, ethylene-vinyl acetate copolymer or ethylene propylene diene monomer (EPDM) material are made.
Further, second thin slice every four are distributed between the first thin slice and grid framework for one group, and first is thin
Respectively there is second thin slice between the two-arm of piece.
The utility model sound insulation room flexibility acoustic metamaterial structure is that the sub-wavelength local based on acoustic metamaterial is total
The innovation structure scheme that the requirement for principle and practical application condition of shaking proposes, arranges structure through two-dimension periodic by several unit cells
At showing as the design form in film surface distribution rule quality morphology piece (cross thin slice, thin rounded flakes), wherein grill frame
Erect supporting role；Its structure is simple, is easy to mass processing and forming；Material therefor is all conventional material, as PI, PE, PET,
Nylon, EVA, EPDM, acrylic, iron, aluminium etc., low in cost and clean and environmental protection；Overall structure is light, thin, soft, more meets real
The requirement of border engineer application；Its structural unit realizes broadband, high sound insulation property, has broken the limitation of mass law of sound insulation, realizes
Sound transmission loss is much higher than the homogeneous EVA material of identical surface density, STL and by experimental verification.
Numerous research datas shows that, in antiresonant frequency, structure shows excellent sound insulation effect.But in general object
In reason system, antiresonance mode is interval (there are resonance modes), and this discontinuous antiresonance mode will lead to sound insulation frequency
Band is truncated, and sound insulation paddy occurs, so effectively sound insulation frequency band is often relatively narrow.According to quality piece distributed coordination design concept,
The utility model relates to special construction form (such as cross to thin rounded flakes), special distribution form and its relevant material join
Number causes overall structure that continuous dynamic is presented flat so that generating continuous multiple bends antiresonance mode in the structural unit
Weighing apparatus (average Normal Displacement ≈ 0 is even negative), realizes high sound insulation property in broadband；Therefore, in wide frequency range, sound can
By local in each oscillator element (cross thin slice, thin rounded flakes) of body structure surface, to realize the continuous acoustic attenuation in broadband.
It by rationally designing the structural parameters and material parameter of each oscillator and film covering, and is allowed to match, can make excellent
The acoustic metamaterial unit of choosing generates biggish negative equivalent mass, and negative mass characteristic is more obvious, and the antiresonance of structure couples behavior
Stronger, STL peak value is also higher.Because of the antiresonance characteristic (quantity including antiresonance coupled mode and continuous of metamaterial unit
Property) related with the form of structure, distribution form and material, so, it can be thin by adjusting grid framework, film covering, cross
The structure and material parameter of piece and thin rounded flakes, to adjust STL bandwidth and amplitude.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of broadband sound insulation property flexibility frequency acoustic Meta Materials provided by the utility model.
Fig. 2 is a unit cell schematic diagram of Fig. 1.
Fig. 3 is a round unit cell schematic diagram of the utility model.
Fig. 4 is the STL curve of the preferred embodiment in the utility model.
Fig. 5 be the utility model relates to round unit cell equivalent mass curve and average normal direction displacement curve.
Fig. 6 is vibration mode schematic diagram all in Fig. 3 cellular in STL bandwidth in Fig. 4.
Description of symbols: 1- grid framework, 1.1- ring grille frame, 2- film covering, the first thin slice of 3-, 4- second
Thin slice.
Specific embodiment
The utility model is described in further detail with attached drawing combined with specific embodiments below.
Broadband sound insulation property flexibility frequency acoustic metamaterial structure as shown in Figure 1:, including grid framework 1, film covering 2, ten
Word thin slice 3 and thin rounded flakes 4.Grid framework 1 is formed by single rectangular cells lattice through two-dimensional and periodic continuation；Film covering 2 covers
It is placed on the side of grid framework 1；First thin slice 3 and the second thin slice 4 are distributed in the rectangular cells lattice of grid framework 1, are placed in thin
The surface of film covering 2
Specifically, grid framework 1, the first thin slice 3 and the second thin slice 4 are fixed on the ipsilateral or heteropleural on 2 surface of film covering,
It is ipsilateral in diagram, wherein grid framework 1 plays a supportive role.Single rectangular cells lattice, single first thin slice of grid framework 1
3, four the second thin slices 4 and film covering 2 constitute a unit cell of sound insulation property flexibility frequency acoustic metamaterial structure.
Grid framework 1 is globality, and including a plurality of bar shaped skeleton to intersect vertically in length and breadth, grid framework 1 is each rectangular
The frame side length a of cell is 30-140mm, width w3 is 4-20mm, and thickness h 3 is 1-5mm.It is by EVA flexible or EPDM
Material is made.The thickness h 4 of film covering 2 is 0.05-0.5mm, is made of PI, PE, PET, nylon or silastic material.
First thin slice 3 can be cross thin slice, the second thin slice 4 be thin rounded flakes, thin rounded flakes be distributed in cross thin slice with
Between grid framework 1, thin rounded flakes every four are distributed between cross thin slice and grid framework 1 for one group, and the two of cross thin slice
Arm respectively has a thin rounded flakes.
The two-arm of first thin slice 3 intersects vertically, and the length w1 of every arm is 20-80mm, and width w2 is 2-8mm, thickness h 1
For 1-5mm；First thin slice 3 is made of EVA, EPDM or acrylic material.The radius r of thin rounded flakes 4 is 2-8mm, and thickness h 2 is
1-5mm；Thin rounded flakes 4 are made of iron, aluminium, acrylic, ethylene-vinyl acetate copolymer or ethylene propylene diene monomer (EPDM) material.
Expansion, the structure and material by adjusting grid framework 1, film covering 2, cross thin slice and thin rounded flakes is joined
The adjustment, it can be achieved that amplitude and frequency range of STL is counted, target design requirement is met.Such as: increase the side length of grid framework 1, reduce
The side length of cross thin slice, the width for reducing cross thin slice or the Young's modulus for reducing film covering 2, will all draw to some extent
It is mobile to more low frequency to play STL peak value, and bandwidth narrows；The radius for increasing thin rounded flakes will cause STL peak value to move to the right (intermediate frequency)
It is dynamic, and bandwidth broadens；It is mobile to more low frequency to cause STL peak value for the thickness for reducing film covering 2, and bandwidth slightly narrows.
As shown in figure 3, broadband sound insulation property flexibility frequency acoustic metamaterial structure includes ring grille frame in the present embodiment
1.1, film covering 2, cross thin slice and thin rounded flakes.Wherein, 1.1 support film covering 2 of ring grille frame；Film covering 2
It is covered in the side of ring grille frame 1.1；Cross thin slice is distributed in the center of ring grille frame 1, is pasted on film covering 2
Surface；Thin rounded flakes are distributed between cross thin slice and ring grille frame 1.1.Ring grille frame 1.1, cross thin slice and circle
Shape thin slice is glued to the same side on 2 surface of film covering.
2=100mm(of outside diameter d of ring grille frame 1.1 is identical as impedance bore), internal diameter d1=90mm, thickness h 3=
2mm, material are EVA material flexible.4=0.2mm of thickness h of film covering 2, material are PI material.The two-arm of cross thin slice is hung down
Straight intersection, right-angled intersection point are located at the center of round single cell structure, side length w1=40mm, width w2=4mm, 1=2mm of thickness h,
Material is EVA material flexible.The quantity of thin rounded flakes is 4, is respectively positioned between the two-arm of cross thin slice, radius r=6mm,
2=2mm of thickness h, material are iron.
By impedance tube apparatus in the present embodiment single cell structure carry out sound transmission loss test, with STL characterize its every
Acoustic performance.When test, exemplar is set in impedance tube, fixes its edge using greasy filth sealing, relevant testing standard is " GB/Z
Measurement-transfer matrix method of loss is transmitted in 27764-2011 acoustic impedance pipe ".
Acquired results are as shown in Figure 4.For the ease of illustrating, therefore the first STL valley point of label is A, STL in Fig. 4
Peak point is B, the 2nd STL valley point is C, wherein the sound insulation frequency band between A point and C point is referred to as STL bandwidth.Solid line is in Fig. 4
The STL curve of FEM calculation, dotted line are the STL curve that experiment measures.Find out, simulation result and experimental result consistency are preferable
(correspondence for being presented as curvilinear trend, peak value and valley).As a comparison, it is also marked with the solid line with warning triangle in Fig. 4
The STL empirical curve of homogeneous EVA thin plate, it is to be noted that homogeneous EVA thin plate and the single cell structure of the utility model in Fig. 3 have
There is identical surface density；In addition, also with long-short dash line indicated mass law of sound insulation defined by STL curve.As can be seen that
The STL bandwidth of the preferred embodiment in the utility model is 50-736Hz, is up to 48dB in B point STL peak value.Sound insulation bandwidth obtains significantly
It widens, and continuous (without biggish sound insulation paddy in STL bandwidth)；Meanwhile STL amplitude is also therefore greatly increased, occur significantly every
Sound peak.STL in 656Hz following frequency range is much higher than the STL of mass law of sound insulation.In addition, the results showed that
560Hz is hereinafter, the STL of the preferred embodiment in the utility model is much higher than STL, mean height 7dB with surface density EVA thin plate.
Solid line in Fig. 5 with warning triangle is the equivalent mass curve being normalized, and dotted line is the method for average being normalized
To displacement curve.All vibration modes of Fig. 6 structure between A point and C point, wherein arrow indicates direction of displacement, incident acoustic wave
Direction is from bottom to top.It is further analyzed and described in conjunction with Fig. 5 and Fig. 6, for disclosing the mechanism in the broadband STL and peak value formation.In A
Point, the direction of vibration and incident acoustic wave in structure centre region are in the same direction, and the vibration of cross thin slice oscillator and Z-mode shearing wave generate by force
The effect of intercoupling, then structure shows the lump coupled resonance behavior of central area, and STL is caused the first valley, A point occur
For the lower frequency limit of STL bandwidth.Meanwhile the equivalent mass of structure is 0, which is similar to the full impregnated medium of massless, then
Easily penetrated by sound wave.In B point, STL to reach to peak value.Structure shows as a kind of antiresonance behavior: four thin rounded flakes distinguish table
It is now the lateral antiresonance mode of itself.The antiresonance mode is coupled with sound wave, and a large amount of sound can be shaken by local in thin rounded flakes
The inside of son, the average Normal Displacement of structure are 0, and sound wave is effectively controlled.In addition, equivalent mass from positive extreme value jump to
Cathode value shows that structure generates strong antiresonance coupling behavior, determines STL peak value size.In C point, structure centre region
Antiresonance intensity be weaker than the strength of resonance in the same direction of perimetric film covering, this causes a large amount of sound that can be assembled and be transmitted.Therefore,
Brilliant STL bandwidth is terminated, and second STL paddy occurs.In addition, equivalent mass is equal to the 0 upper frequency limit for determining STL bandwidth
Rate.
Further, in STL bandwidth, the single cell structure of the utility model shows 15 kinds of continuous multiple local anti-communisms
Vibration mode, no rank circle resonance mode.Find out from these antiresonance modes, just because of these two types of specific form oscillator (cross
With thin rounded flakes) and its special distribution form, so that structure generates multiple continuous antiresonance and coordinates behavior, these antiresonance
Behavior causes structure to realize continuous dynamic balance state (average Normal Displacement ≈ 0) in wider frequency section, so that STL frequency band quilt
It widens.In addition, the negative equivalent mass characteristic of structure is more obvious, the antiresonance behavior of structure is stronger, and STL peak value is also higher.And
The antiresonance characteristic (quantity and continuity including antiresonance coupled mode) of metamaterial unit and the structural form of oscillator and divide
Cloth form is related.Therefore, STL bandwidth and width can be adjusted by changing the structure and material parameter of oscillator and covering film
Value.
Claims (10)
1. a kind of broadband sound insulation property flexibility frequency acoustic metamaterial structure, which is characterized in that covered including grid framework (1), film
Skin (2), the first thin slice (3) and the second thin slice (4)；The grid framework (1) by individual unit lattice through two-dimensional and periodic continuation and
At；Film covering (2) is covered in the side of grid framework (1)；First thin slice (3) and the second thin slice (4) are distributed in grid framework
(1) in cell, it is placed in the surface of film covering (2).
2. broadband sound insulation property flexibility frequency acoustic metamaterial structure according to claim 1, which is characterized in that the grid
Frame (1), the first thin slice (3) are fixed on the ipsilateral or heteropleural on film covering (2) surface with the second thin slice (4).
3. broadband sound insulation property flexibility frequency acoustic metamaterial structure according to claim 1, which is characterized in that the grid
The individual unit lattice of frame (1), single first thin slice (3), four the second thin slices (4) and film covering (2) constitute sound insulation property
One minimum period unit of flexible frequency acoustic metamaterial structure.
4. broadband sound insulation property flexibility frequency acoustic metamaterial structure according to claim 1, which is characterized in that the grid
Frame (1) includes a plurality of bar shaped skeleton to intersect vertically in length and breadth；Grid framework (1) each cell is square frame structure, side
Long a is 30-140mm, width w3 is 4-20mm, and thickness h 3 is 1-5mm.
5. broadband sound insulation property flexibility frequency acoustic metamaterial structure according to claim 1 or 4, which is characterized in that described
Grid framework (1) is made of ethylene-vinyl acetate copolymer or ethylene propylene diene monomer (EPDM) material.
6. broadband sound insulation property flexibility frequency acoustic metamaterial structure according to claim 1, which is characterized in that the film
The thickness h 4 of covering (2) is 0.05-0.5mm, by polyimides, polyethylene, polyethylene terephthalate, nylon or silicon rubber
Glue material is made.
7. broadband sound insulation property flexibility frequency acoustic metamaterial structure according to claim 1, which is characterized in that described first
Thin slice (3) is cross, and the second thin slice (4) is circle, the second thin slice (4) be distributed in the first thin slice (3) and grid framework (1) it
Between.
8. broadband sound insulation property flexibility frequency acoustic metamaterial structure according to claim 7, which is characterized in that described first
The two-arm of thin slice (3) intersects vertically, and the length w1 of every arm is 20-80mm, and width w2 is 2-8mm, and thickness h 1 is 1-5mm；The
One thin slice (3) is made of ethylene-vinyl acetate copolymer, ethylene propylene diene rubber or acrylic material.
9. broadband sound insulation property flexibility frequency acoustic metamaterial structure according to claim 7, which is characterized in that described second
The radius r of thin slice (4) is 2-8mm, and thickness h 2 is 1-5mm；Second thin slice (4) is total by iron, aluminium, acrylic, ethene-vinyl acetate
Polymers or ethylene propylene diene monomer (EPDM) material are made.
10. according to claim 1 or broadband sound insulation property flexibility frequency acoustic metamaterial structure described in 9, which is characterized in that described
Second thin slice (4) every four are distributed between the first thin slice (3) and grid framework (1) for one group, the two-arm of the first thin slice (3) it
Between respectively have second thin slice (4).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111312203A (en) * | 2020-02-28 | 2020-06-19 | 清华大学 | Flexible acoustic metamaterial structure |
| CN112259066A (en) * | 2020-10-23 | 2021-01-22 | 西安交通大学 | N-order acoustic metamaterial low-frequency sound insulation structure |
| CN112687252A (en) * | 2020-12-18 | 2021-04-20 | 浙江大学 | Device for regulating and controlling low-frequency sound insulation performance of sandwich plate structure and parameter determination method thereof |
| CN112863471A (en) * | 2021-01-14 | 2021-05-28 | 湖北航鹏化学动力科技有限责任公司 | Sound insulation device |
| CN112874066A (en) * | 2021-01-08 | 2021-06-01 | 哈尔滨工程大学 | Honeycomb structure plate integrating vibration suppression and light weight and high strength and preparation method thereof |
| CN113808562A (en) * | 2021-09-29 | 2021-12-17 | 哈尔滨工程大学 | Three-dimensional chiral acoustic metamaterial with high bearing capacity and low broadband vibration suppression performance |
| CN113823253A (en) * | 2021-10-28 | 2021-12-21 | 深圳清华大学研究院 | Semi-isolation type film type low-frequency sound insulation acoustic metamaterial |
| WO2022268233A1 (en) * | 2021-06-22 | 2022-12-29 | 国网智能电网研究院有限公司 | Sound insulation structure having low-frequency broadband sound insulation function |
| CN117360026A (en) * | 2023-12-07 | 2024-01-09 | 迈默智塔(无锡)科技有限公司 | Composite material with sound insulation and electromagnetic prevention functions for building |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111312203A (en) * | 2020-02-28 | 2020-06-19 | 清华大学 | Flexible acoustic metamaterial structure |
| CN111312203B (en) * | 2020-02-28 | 2021-03-12 | 清华大学 | Flexible acoustic metamaterial structure |
| CN112259066A (en) * | 2020-10-23 | 2021-01-22 | 西安交通大学 | N-order acoustic metamaterial low-frequency sound insulation structure |
| CN112687252A (en) * | 2020-12-18 | 2021-04-20 | 浙江大学 | Device for regulating and controlling low-frequency sound insulation performance of sandwich plate structure and parameter determination method thereof |
| CN112874066A (en) * | 2021-01-08 | 2021-06-01 | 哈尔滨工程大学 | Honeycomb structure plate integrating vibration suppression and light weight and high strength and preparation method thereof |
| CN112863471A (en) * | 2021-01-14 | 2021-05-28 | 湖北航鹏化学动力科技有限责任公司 | Sound insulation device |
| WO2022268233A1 (en) * | 2021-06-22 | 2022-12-29 | 国网智能电网研究院有限公司 | Sound insulation structure having low-frequency broadband sound insulation function |
| CN113808562A (en) * | 2021-09-29 | 2021-12-17 | 哈尔滨工程大学 | Three-dimensional chiral acoustic metamaterial with high bearing capacity and low broadband vibration suppression performance |
| CN113808562B (en) * | 2021-09-29 | 2024-06-04 | 哈尔滨工程大学 | Three-dimensional chiral acoustic metamaterial with high bearing capacity and low-broadband vibration suppression performance |
| CN113823253A (en) * | 2021-10-28 | 2021-12-21 | 深圳清华大学研究院 | Semi-isolation type film type low-frequency sound insulation acoustic metamaterial |
| CN113823253B (en) * | 2021-10-28 | 2023-10-31 | 深圳清华大学研究院 | Semi-isolated film type low-frequency sound insulation acoustic metamaterial |
| CN117360026A (en) * | 2023-12-07 | 2024-01-09 | 迈默智塔(无锡)科技有限公司 | Composite material with sound insulation and electromagnetic prevention functions for building |
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