CN110047458A - Absorb sound unit, sound absorption structure and sound absorption method - Google Patents
Absorb sound unit, sound absorption structure and sound absorption method Download PDFInfo
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- CN110047458A CN110047458A CN201910231914.1A CN201910231914A CN110047458A CN 110047458 A CN110047458 A CN 110047458A CN 201910231914 A CN201910231914 A CN 201910231914A CN 110047458 A CN110047458 A CN 110047458A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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Abstract
Disclose sound absorption unit, sound absorption structure and sound absorption method, the unit that absorbs sound includes born of the same parents' lattice, partition and cover board born of the same parents' lattice are positive hexagonal structure, baffle arrangement is in born of the same parents' lattice, the partition separates born of the same parents' lattice and to form continuous labyrinth channel in regular hexagon structure, cover plate lid sets born of the same parents' lattice, sound absorption structure includes multiple sound absorption units, resonance coupling between the sound absorption unit, by adjusting it is described sound absorption unit geometric parameter to realize the absorption to different frequency noise, sound absorption method includes the following steps, noise frequency to be absorbed determines the geometric dimension of at least one sound absorption unit based on one or more, the sound absorption unit of the geometric dimension is processed in 3 D-printing or die sinking, the multiple sound absorption units of resonance coupling form sound absorption structure, by the opening of sound absorption structure towards noise source to absorb sound.
Description
Technical field
The present invention relates to field of noise control, more particularly, to a kind of sound absorption unit, sound absorption structure and sound absorption method.
Background technique
With the continuous development of society, the harm of noise is outstanding day by day.Noise not only seriously affects the audio experience of people, drop
Low quality of the life, or even the health of people can be impacted.Usually, noise control can be controlled from sound source, be propagated
Three aspects of path clustering and acceptor insulation blocking are started with.Among these, sound absorption means are utilized in propagation path, are effectively inhibited
The negative effect of noise becomes the important means of engine noise control.
However, being all a huge challenge all the time for the control of low-frequency noise.Low-frequency noise wavelength is long, in sky
The slow and penetration capacity that decays in gas is strong.Thus traditional sound-absorbing material such as porous material, is difficult to reach effective in low-frequency range
Acoustic attenuation effect.Realize effective absorption to low-frequency sound wave, sound-absorbing material will be substantially in geometric dimension with wavelength
The same order of magnitude.For the low-frequency noise long for several metric waves easily, so huge compromise makes it in engineer application in size
On face very big limitation.
In recent years, the development of acoustic resonance structure also brings new thinking for low-frequency noise control.It resonates including film
A series of sound absorption structures such as sound-absorbing material, helmholtz resonance cavity configuration and microperforated panel have all obtained answering extensively in engineering
With.Certainly, these resonant structures also have the problems such as structure is complicated, resonance bands are narrow.The super surface of acoustics is located at Asia as a kind of
The novel acoustic Meta Materials of wavelength dimension flexibly manipulate the ability of sound wave because of the frivolous structure of its two dimensionization, asymmetric in sound wave
Propagation, the focusing of the stealthy cape of acoustics, sound wave etc. have huge application potential.In general, the prior art there is also with
Lower several points challenge:
Although 1) Meta Materials sound sucting band has and significantly widens in recent years, this, which is built upon, sacrifices structural thickness and is
Cost.Therefore under the premise of guaranteeing frivolous, the structure for obtaining broadband perfection sound absorption effect still needs to be explored.
2) development of 3D printing technique is depended on, but different from the manufacture in laboratory, acoustic board, suction in engineer application
Acoustic shell volume is relatively large, and 3D printing technique is not a mature fabrication scheme for producing in enormous quantities, but complicated
Geometric modeling be not suitable for die sinking manufacture again, machining is also more difficult.
3) assessment of sound absorption effect is often carried out under conditions of plane wave vertical incidence at present, but reverberation field
The case where there is no enough in-depth studies, engineering in practice, can true sound absorption effect, which reach desired value, to discuss.
4) application environment of sound absorption structure is complex, also has for the adaptability of high temperature, low temperature, greasy dirt, vibration etc.
To further experimental verification.
Disclosed above- mentioned information are used only for enhancing the understanding to background of the present invention in the background section, it is thus possible to
Information comprising not constituting the prior art known to a person of ordinary skill in the art in home.
Summary of the invention
In view of the above problems, it is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind
Absorb sound unit, sound absorption structure and sound absorption method, can be may be implemented by the way that geometric parameter is adjusted to different frequency noise
Absorption.
Electromagnetic noise is especially reduced, electromagnetic noise has the noise of distinguishing feature, such as typical transformer as one kind
Noise, noise of motor, noise frequency are concentrated mainly on the electric current order harmonic frequencies in the low-frequency range lower than 500Hz,
Such as 100Hz, 200Hz and 300Hz, currently invention addresses electric current fundamental frequency and its order harmonic frequencies, omit using in two kinds of structures
Differentiated unit cell intercouples, and using both high order resonance, can get 100Hz, 200Hz, 300Hz, 500Hz,
High acoustic absorption rate at 700Hz, in addition, the present invention is as a kind of base unit structure, can by the way that geometric parameter is adjusted,
The absorption to different frequency noise may be implemented, the fundamental resonance frequency for adjusting two unit cells keeps the two close, reaches coupling effect, also
It can realize that broadband absorbs sound to a certain extent, thus there is good applicability and wide future in engineering applications.In addition this hair
Bright structure is simple, is not necessarily to 3 D-printing, can be opened processing, and processing cost significantly reduces, the present invention suitable for high temperature, low temperature,
The complicated applications environment such as greasy dirt, vibration.
The purpose of the present invention is be achieved by the following technical programs.
A kind of sound absorption unit includes,
Born of the same parents' lattice, be positive hexagonal structure, and born of the same parents' lattice side length is a,
Partition is arranged in born of the same parents' lattice, and the partition separates born of the same parents' lattice and makes the company of being formed in regular hexagon structure
Continuous labyrinth channel, the labyrinth channel width are b, and the spacer width is t, wherein
Cover board, lid set born of the same parents' lattice.
In the sound absorption unit, the partition is the substantially inside continuous slab of spiral.
In the sound absorption unit, upper cover plate corresponds to born of the same parents' lattice center and is equipped with opening, and the opening is diameter d
Circular hole.
In the sound absorption unit, the resonance centre frequency of the sound absorption unit isWherein a
For born of the same parents' lattice side length, m is resonance order, and L is labyrinth channel effective length, by adjusting labyrinth channel effective length L to adjust
State resonance centre frequency；AbsorptivityAmong these, Wherein, f is frequency to the π of ω=2 f, and μ is air force viscosity, and ρ is atmospheric density, and c is air
The middle velocity of sound, d are hole diameter, and t is cover sheet thickness (aperture depth), S1For sound absorption cell cross-section product, S2It is transversal for air duct
Area.
The removable second partition for adjusting resonant frequency is equipped in the sound absorption unit, in the labyrinth channel,
The second partition separates the labyrinth channel.
In the sound absorption unit, the sound absorption unit is by being selected from FR4 epoxy resin, ABS resin, organic glass and aluminium
One of or a variety of be made.
According to a further aspect of the invention, a kind of sound absorption structure includes multiple sound absorption units, between the sound absorption unit
Resonance coupling, by adjusting it is described sound absorption unit geometric parameter to realize the absorption to different frequency noise.
In the sound absorption structure, the sound absorption unit has different geometric dimensions, the sound absorption list of different geometrical size
First parallel connection is to obtain multiple sound absorption peaks.
In the sound absorption structure, the sound absorption unit is combined to form plate knot by diagonal line same way linear array
Structure.
According to another aspect of the invention, a kind of sound absorption method using the sound absorption structure includes the following steps,
First step, noise frequency to be absorbed determines the dimensioning of at least one sound absorption unit based on one or more
It is very little,
The sound absorption unit of the geometric dimension is processed in second step, 3 D-printing or die sinking,
Third step, the multiple sound absorption units of resonance coupling form sound absorption structures, by the opening of sound absorption structure towards noise source
With sound absorption.
Compared with prior art, the beneficial effects of the present invention are:
The present invention absorbs sound unit with significant sound absorption characteristics, and the material of production unit structure is high molecular material, density
It is lower, it is simple light, there is wide future in engineering applications to adjust with can be convenient by adjusting the geometric parameter of cellular construction
Save the centre frequency of first order resonant.In the sound absorption characteristics of cellular construction designed by the present invention and improvement cellular construction, absorption peak
Position is mainly related with the equivalent length of labyrinth channel, parameter that can be separately adjustable.Thus can be purposive, guiding root
The determination of structure size is carried out according to sound absorption target and structure is improved.
The above description is only an overview of the technical scheme of the present invention, in order to make technological means of the invention clearer
Understand, reach the degree that those skilled in the art can be implemented in accordance with the contents of the specification, and in order to allow the present invention
Above and other objects, features and advantages can be more clearly understood, illustrated below with a specific embodiment of the invention
Explanation.
Detailed description of the invention
By reading the detailed description in hereafter preferred embodiment, various other advantages and benefits of the present invention
It will become apparent to those of ordinary skill in the art.Figure of description only for the purpose of illustrating preferred embodiments,
And it is not to be construed as limiting the invention.It should be evident that drawings discussed below is only some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.And throughout the drawings, identical component is presented with like reference characters.
In the accompanying drawings:
Fig. 1 is the structural schematic diagram of sound absorption unit according to an embodiment of the invention；
Fig. 2 is the diagrammatic cross-section of sound absorption unit according to an embodiment of the invention；
Fig. 3 is the structural schematic diagram of sound absorption unit according to an embodiment of the invention, and wherein second partition reduces air
The equivalent length in channel, and then make resonance centre frequency to high-frequency mobile；
Fig. 4, which is two according to an embodiment of the invention, has the sound absorption unit of different parameters n identical according to diagonal line
2 × 2 unit figures that combine of principle；
Fig. 5 is the plate structure schematic diagram obtained after unit linear array shown in Fig. 4；
Fig. 6 is another plate structure schematic diagram obtained after unit linear array shown in Fig. 4；
Fig. 7 is sound absorption unit simulation model according to an embodiment of the invention, and there are the incidences of the plane of 1Pa in region
Wave and back wave；
Fig. 8 is the simulation model schematic diagram of 2 × 2 structures of sound absorption unit according to an embodiment of the invention；
Fig. 9 is the step schematic diagram of sound absorption method according to an embodiment of the invention；
Figure 10 is the acoustic resistance acoustic reactance curve graph of single absorptive unit of the invention；
Figure 11 is the absorptivity analytic curve and numerical value simulation curve figure of single absorptive unit of the invention；
Figure 12 is absorptivity numerical simulation curve graph of the present invention combination unit cell in 80-800Hz frequency range；
Below in conjunction with drawings and examples, the present invention will be further explained.
Specific embodiment
1 to the specific embodiment that the present invention will be described in more detail of attached drawing 12 below with reference to accompanying drawings.Although being shown in attached drawing
Specific embodiments of the present invention, it being understood, however, that may be realized in various forms the present invention without that should be illustrated here
Embodiment is limited.On the contrary, providing these embodiments is to be able to thoroughly understand the present invention, and can will be of the invention
Range be fully disclosed to those skilled in the art.
It should be noted that having used some vocabulary in the specification and claims to censure specific components.Ability
Field technique personnel it would be appreciated that, technical staff may call the same component with different nouns.This specification and right
It is required that not in such a way that the difference of noun is as component is distinguished, but with the difference of component functionally as differentiation
Criterion."comprising" or " comprising " as mentioned throughout the specification and claims are an open language, therefore should be solved
It is interpreted into " including but not limited to ".Specification subsequent descriptions are to implement better embodiment of the invention, so the description be with
For the purpose of the rule of specification, the range that is not intended to limit the invention.Protection scope of the present invention is when the appended right of view
It is required that subject to institute's defender.
In order to facilitate understanding of embodiments of the present invention, further by taking specific embodiment as an example below in conjunction with attached drawing to be solved
Explanation is released, and each attached drawing does not constitute the restriction to the embodiment of the present invention.
A kind of sound absorption unit includes,
Born of the same parents' lattice, be positive hexagonal structure, and born of the same parents' lattice side length is a,
Partition is arranged in born of the same parents' lattice, and the partition separates born of the same parents' lattice and makes the company of being formed in regular hexagon structure
Continuous labyrinth channel, the labyrinth channel width are b, and the spacer width is t, wherein
Cover board, lid set born of the same parents' lattice.
In one embodiment of the sound absorption unit, the partition is the substantially inside continuous slab of spiral.
In one embodiment of the sound absorption unit, upper cover plate corresponds to born of the same parents' lattice center and is equipped with opening, institute
State the circular hole that opening is diameter d.
In one embodiment of the sound absorption unit, the resonance centre frequency of the sound absorption unit isWherein a is born of the same parents' lattice side length, and m is resonance order, and L is labyrinth channel effective length, by adjusting labyrinth
Channel effective length L is to adjust the resonance centre frequency；AbsorptivityAmong these,ys=yhole+ycavity,Wherein μ is air to the π of ω=2 f
Dynamic viscosity, ρ are atmospheric density, and c is THE VELOCITY OF SOUND IN AIR, and d is hole diameter, and s is cover sheet thickness (aperture depth), S1For sound absorption
Cell cross-section product, S2For air duct cross-sectional area.
In one embodiment of the sound absorption unit, the removable of resonant frequency is adjusted equipped with English in the labyrinth channel
Dynamic second partition, the second partition separate the labyrinth channel.
In one embodiment of the sound absorption unit, the sound absorption unit is by being selected from FR4 epoxy resin, ABS resin, having
One of machine glass and aluminium a variety of are made.
For a further understanding of the present invention, in one embodiment, inhaled for fixed frequency single in low-frequency range and its frequency multiplication
The sound absorption unit of the super surface foundation cellular construction of the labyrinth type acoustics of sound is as shown in Figure 1, single cell structure is regular hexagon, Ke Yi
Mi Pu in plane, while the mechanical strength of hexagonal structure is preferable.Side length is a, is highly h, and labyrinth channel width is b, partition
Width and upper cover plate are with a thickness of t.Meet following relationship between the single cell structure geometric dimension provided in figure:
Its geometric parameter is adjusted, its resonance centre frequency can be made to reach 100Hz.The upper and lower cover plates of base unit structure and
Intermediate labyrinth structure, material be can be FR4 epoxy resin, ABS resin, organic glass and aluminium etc..It is noted that
Here material selection is mainly processed as principle to facilitate.For example, facilitating the ABS resin of 3D printing production and facilitating mach aluminium
Material etc..At the center of labyrinth structure, there are aperture, hole diameter d at upper cover plate.
Make a series of variations on designed base unit, desired sound absorption effect may be implemented:
Second partition is added in base unit air duct shown in Fig. 1, so as to shorten the effective length of air duct,
As shown in Fig. 2, its centre of oscillation frequency is 200Hz, partition can arbitrarily move in channel, to adjust the resonance frequency of unit
Rate.
By two kinds of base unit structures with different parameters, one 2 × 2 is combined by the identical mode of diagonal line and is answered
Cellular construction is closed, as shown in Figure 3.
It by two kinds of recombiner unit structures shown in Fig. 1,2, is combined by checkerboard arrangement, forms infinitely great plate knot
Structure, as shown in Figure 4.
By adjusting second partition position, the absorption for different frequency noise may be implemented.Simultaneously by two kinds of base units
It is linked togather, available multiple sound absorption peaks, to realize effective absorption for multiple single-frequency noises.It is single using basis simultaneously
The high-order absorption peak of member, can effectively absorb the frequencys multiplication such as three, five, seven of base unit resonant frequency, especially suitable for
Electromagnetism noise like.Structure designed by the present invention is as a kind of enterprise infrastructure, with structure is simple, weight is light, low frequency is inhaled
The advantages such as sound effective value is good, at the same have it is very big expand space, adjust its absorption peak with can be convenient, increase its applicable situation.
2 × 2 composite construction shown in Fig. 3 shows expected sound absorption characteristics in impedance tube.800Hz resonance below
Peak respectively appears in 100Hz, 200Hz, 300Hz, 500Hz, 600Hz and 700Hz.Wherein to the suction of 100Hz and 200Hz noise
Yield has reached 85% or more.This coincide with by the spectral characteristic of the electromagnetic noise of representative of transformer noise, has very high
Engineering application value.
A kind of typical structural thickness of the structure is 22mm, and only the 0.64% of wavelength, the material of production unit structure is
High molecular material, density is lower, simple light, has wide future in engineering applications.
By adjusting the geometric parameter of cellular construction, the centre frequency of first order resonant is adjusted with can be convenient；When two kinds of bases
When the resonant frequency of plinth unit is close, two formants can also be coupled into a broader formant.
It cellular construction designed by the present invention and improves in the sound absorption characteristics of cellular construction, absorbs peak position mainly and labyrinth
The equivalent length in channel is related, and assimilation effect is mainly related with the ratio between percent opening perforated area and the unit gross area, is two phases
It is unrelated, parameter that can be separately adjustable.Thus purposive, guiding structure size can be carried out according to sound absorption target
Determining and structure is improved.
A kind of sound absorption structure includes multiple sound absorption units, resonance coupling between the sound absorption unit, by adjusting institute
The geometric parameter of sound absorption unit is stated to realize the absorption to different frequency noise.
In one embodiment of the sound absorption structure, the sound absorption unit has different geometric dimensions, different geometry
The sound absorption unit parallel connection of size is to obtain multiple sound absorption peaks.
In one embodiment of the sound absorption structure, the sound absorption unit is combined by diagonal line same way linear array
Form plate structure.
In order to better understand, the sound absorption structure on the super surface of labyrinth type sound absorption is done for the single-frequency noise and its frequency multiplication of low frequency
Specific optimization, as shown in Figure 1, its base unit structure is made of intermediate labyrinth structure and upper and lower cover plates.Not by two kinds
Same base unit is combined in a manner of scheming (3), has just obtained one group 2 × 2 of structure.By 2 × 2 structure along plane side
To unlimited array, so that it may obtain acoustic board.Cellular construction is made by the way of 3D printing, printed cellular construction according to
Acoustic board can be obtained in above method Mi Pu.It should be noted that the structure is for geometric parameter rdativery sensitive, in order to guarantee to tie
Structure can work in the resonant frequency of setting, and the precision of 3D printing needs to reach submillimeter level.
For sound absorption cellular construction designed by the present invention shown in FIG. 1, side length a is 82mm, and height h is 22mm.
For the sound absorption characteristics on the theory analysis super surface of labyrinth type acoustics, using large commercial finite element software COMSOL
The hot frequency-domain analysis module of the sound-of Multiphysics 5.3 (Thermoviscous Acoustic, Frequency Domain
Interface finite element simulation simulation model) is established.In order to reduce amount of calculation, only base unit structure is emulated
It calculates, and its boundary condition is defined as Floquet periodic boundary, with the actual size and mounting bar of accurate simulation acoustic board
Part.Entire limit element artificial module is therefore only right as shown in figure 5, our default configuration boundaries are acoustics bounds in simulations
Air duct is modeled in labyrinth structure.It include at this time incident sound pressure Pi and reflecting acoustic pressure Pr in the incident operatic tunes, because of labyrinth
Structural base is acoustics bounds, therefore does not consider sound transmission.Its absorptivity thus can be calculated accordingly, as shown in following formula 1.
Wherein pinFor incident sound energy；psFor reflecting acoustic pressure.
Definition incident sound pressure is 1Pa, and frequency scanning frequency range is 80Hz-1000Hz, step-length 2Hz.Finite element simulation obtains
The sound absorption curve of the super surface texture of labyrinth type acoustics is illustrated in fig. 6 shown below.From figure it can be found that 100Hz, 200Hz, 300Hz,
With the presence of absorption peak at 500Hz, 600Hz.For schematic structure, resonance centre frequency are as follows:
Wherein L is labyrinth structure channel effective length, and m is resonance order.When we adjust L, base unit is made by chance to exist
When resonating at 100Hz and 200Hz, that is, it can reach sound absorption effect shown in figure.
Absorptivity can be expressed asAmong these,ys=yhole+ycavity,Wherein μ is sky to the π of ω=2 f
Aerodynamic force viscosity, ρ are atmospheric density, and c is THE VELOCITY OF SOUND IN AIR, and d is hole diameter, and s is cover sheet thickness (aperture depth), S1To inhale
Sound cell cross-section product, S2For air duct cross-sectional area.By adjusting the geometric dimension of sound absorption structure, so that xs=1, ys=
0, sound absorption can be made to be optimal effect, as shown in Figure 10, at 100Hz, designed absorptive unit meets this mesh just
Mark.
As shown in figure 9, a kind of sound absorption method using the sound absorption structure includes the following steps,
First step S1, noise frequency to be absorbed determines the dimensioning of at least one sound absorption unit based on one or more
It is very little,
The sound absorption unit of the geometric dimension is processed in second step S2,3 D-printing or die sinking,
Third step S3, the multiple sound absorption units of resonance coupling form sound absorption structures, by the opening of sound absorption structure towards noise
Source is to absorb sound.
The absorption for different frequency noise may be implemented by adjusting the geometric parameter of base unit in the present invention.By two
Kind base unit is connected in parallel, available multiple sound absorption peaks, to realize effective absorption for multiple single-frequency noises.Together
The high-order absorption peak of Shi Liyong base unit can effectively inhale the frequencys multiplication such as three, five, seven of base unit resonant frequency
It receives, especially suitable for electromagnetism noise like.Structure designed by the present invention has structure simple as a kind of enterprise infrastructure, weight
Measure the advantages such as light, effect of low-frequency sound absorption is good, at the same have it is very big expand space, adjust its absorption peak with can be convenient, increase
Add its applicable situation.
Industrial applicibility
Sound absorption unit, sound absorption structure and sound absorption method of the present invention can be manufactured and be used in field of noise.
The basic principle of the application is described in conjunction with specific embodiments above, however, it is desirable to, it is noted that in this application
The advantages of referring to, advantage, effect etc. are only exemplary rather than limitation, must not believe that these advantages, advantage, effect etc. are the application
Each embodiment is prerequisite.In addition, detail disclosed above is merely to exemplary effect and the work being easy to understand
With, rather than limit, it is that must be realized using above-mentioned concrete details that above-mentioned details, which is not intended to limit the application,.
In order to which purpose of illustration and description has been presented for above description.In addition, this description is not intended to the reality of the application
It applies example and is restricted to form disclosed herein.Although already discussed above multiple exemplary aspects and embodiment, this field skill
Its certain modifications, modification, change, addition and sub-portfolio will be recognized in art personnel.
Claims (10)
1. a kind of sound absorption unit, which is characterized in that the sound absorption unit includes,
Born of the same parents' lattice, be positive hexagonal structure, and born of the same parents' lattice side length is a,
Partition is arranged in born of the same parents' lattice, and the partition separates born of the same parents' lattice and to be formed continuously in regular hexagon structure
Labyrinth channel, the labyrinth channel width are b, and the spacer width is t, wherein
Cover board, lid set born of the same parents' lattice.
2. sound absorption unit as described in claim 1, which is characterized in that preferred, the partition is the substantially inside company of spiral
Continuous plate.
3. sound absorption unit as described in claim 1, which is characterized in that upper cover plate is equipped with corresponding to born of the same parents' lattice center and opens
Mouthful, the circular hole that the opening is diameter d.
4. sound absorption unit as described in claim 1, which is characterized in that
It is described sound absorption unit resonance centre frequency beWherein a is born of the same parents' lattice side length, and m is resonance order, and L is
Labyrinth channel effective length, by adjusting labyrinth channel effective length L to adjust the resonance centre frequency；AbsorptivityAmong these,ys=yhole+ycavity,Wherein, f is frequency to the π of ω=2 f,
μ is air force viscosity, and ρ is atmospheric density, and c is THE VELOCITY OF SOUND IN AIR, and d is hole diameter, and t is cover sheet thickness, S1It is single for sound absorption
First cross-sectional area, S2For air duct cross-sectional area.
5. sound absorption unit as described in claim 1, which is characterized in that be equipped in the labyrinth channel for adjusting resonant frequency
Removable second partition, the second partition separates the labyrinth channel.
6. sound absorption unit as described in claim 1, which is characterized in that the sound absorption unit is by being selected from FR4 epoxy resin, ABS
One of resin, organic glass and aluminium a variety of are made.
7. a kind of sound absorption structure, which is characterized in that the sound absorption structure includes multiple suctions as described in any one of claim 1-6
Sound unit, resonance coupling between the sound absorption unit, by adjusting the sound absorption unit geometric parameter to realize to different frequencies
The absorption of rate noise.
8. sound absorption structure as claimed in claim 7, which is characterized in that the sound absorption unit has different geometric dimensions, no
With the sound absorption unit parallel connection of geometric dimension to obtain multiple sound absorption peaks.
9. sound absorption structure as claimed in claim 7, which is characterized in that the sound absorption unit presses diagonal line same way linear rows
Column combination forms plate structure.
10. a kind of sound absorption method using any one of the claim 7-9 sound absorption structure comprising following steps,
First step, noise frequency to be absorbed determines the geometric dimension of at least one sound absorption unit based on one or more,
The sound absorption unit of the geometric dimension is processed in second step, 3 D-printing or die sinking,
Third step, the multiple sound absorption units of resonance coupling form sound absorption structure, by the opening of sound absorption structure towards noise source to inhale
Sound.
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| CN111809756A (en) * | 2020-07-27 | 2020-10-23 | 宁波兴茂地产开发有限公司 | Sound absorption and insulation board |
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| CN112634854A (en) * | 2020-12-17 | 2021-04-09 | 华中科技大学 | Sound absorption performance-adjustable sound absorption metamaterial and additive manufacturing method thereof |
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