CN106652991A - Sound absorption superstructure - Google Patents
Sound absorption superstructure Download PDFInfo
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- CN106652991A CN106652991A CN201610950628.7A CN201610950628A CN106652991A CN 106652991 A CN106652991 A CN 106652991A CN 201610950628 A CN201610950628 A CN 201610950628A CN 106652991 A CN106652991 A CN 106652991A
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- regular hexagon
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- superstructure
- absorption superstructure
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 69
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000003491 array Methods 0.000 claims 1
- 230000000717 retained effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 10
- 230000009467 reduction Effects 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000010587 phase diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/8209—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only sound absorbing devices
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
- E04B2001/8457—Solid slabs or blocks
- E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Multimedia (AREA)
- Building Environments (AREA)
Abstract
The invention discloses a sound absorption superstructure. The sound absorption superstructure comprises a regular hexagon air domain 5, six regular hexagon single cells (6, 7, 8, 9, 10 and 11) at the first layer of the periphery of the regular hexagon air domain 5, and twelve incomplete regular hexagon single cells (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and 23) at the second layer of the periphery of the regular hexagon air domain 5. All single-cell Helmholtz resonant cavities communicate with an external sound field 4 through resonant short tubes. According to the invention, the sound absorption superstructure has single-pole resonance and bipolar resonance phenomena at a low frequency, single-pole resonance can generate a negative dynamic volume modulus, yet bipolar resonance can generate negative dynamic quality density. Due to the negative dynamic volume modulus and the negative dynamic quality density, sound energy is aggregated in the sound absorption superstructure, and thus sound waves are prevented from continuously spreading forward. Therefore, the sound absorption superstructure forms a wide band gap between a single-pole resonance frequency and a bipolar resonance frequency and prevents propagation of the sound waves through a resonant sound absorption mode.
Description
Technical field
The present invention relates to acoustic resonance, sound absorption technique and acoustics superstructure, more particularly to a kind of unit cell of sound absorption superstructure
Structure and its distribution.
Background technology
Sound absorption and noise reduction material can obtain application well, such as the traffic such as automobile, aircraft, high ferro and steamer in many occasions
Household electrical appliance noise reductions such as attendant room's noise reduction, the noise reduction of building, the room conditioning of delivery vehicle etc..Set with the noise reduction of building
Example is calculated as, is generally required and separate by the way of closed Indoor environment space and the exterior space, and using suitable sound absorption
Material, absorbs from outdoor and is transmitted to the noise of interior.But this noise reduction mode can cause closed space, be unfavorable for confined space
With outside air circulation.Additionally, if required up preferable noise reduction, the sound-absorbing material of selection is general thicker, and valency
Lattice are expensive.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of sound absorption superstructure, and it can be under the conditions of unsealed, efficiently
Ground absorbs the noise near superstructure, the sound wave transmission of isolation sound absorption superstructure both sides.
In order to solve above-mentioned technical problem, the present invention provides a kind of sound absorption superstructure, including the unit cell knot of sound absorption superstructure
Structure and its distribution.The single cell structure of sound absorption superstructure is positive six deformations；Positive six deformation is divided into 12 right angled triangles；Each is straight
The inside of angle triangle is the operatic tunes, and the operatic tunes constitutes a Helmholtz resonant cavity by thin mouth and ft connection.Positive six deformation
When space is arranged, using the arrangement of edge-to-edge, and air gap is left.Additionally, when space is arranged, central area is positive six
Side shape air-shed；And one layer of ragged edge can be complete positive six deformation, or according to required geometric shape, align six deform into
Row cutting.
As the improvement of the sound absorption superstructure of the present invention：The unit cell of sound absorption superstructure adopts positive six distressed structure.
As the further improvement of the sound absorption superstructure of the present invention：Positive six deformations unit cell is divided into 12 right angled triangles.
As the further improvement of the sound absorption superstructure of the present invention：The inside of positive six deformations unit cell each right angled triangle is
Helmholtz resonant cavities.
As the further improvement of the sound absorption superstructure of the present invention：When positive six deformation unit cells space is arranged, using edge-to-edge
Arrangement, and leave air gap.
As the further improvement of the sound absorption superstructure of the present invention：The central area of sound absorption superstructure is regular hexagon air
Domain.
As the further improvement of the sound absorption superstructure of the present invention：Sound absorption superstructure outermost layer can be positive six deformation unit cells,
Or according to required geometric shape, aligning six deformation unit cells carries out cutting.
Compared with background technology, tool has the advantages that the present invention：
The sound absorption superstructure can adopt the larger material (such as iron and steel and aluminium alloy) of rigidity process, production cost compared with
It is low.The one pole resonance of present invention sound absorption superstructure can produce negative dynamic volume modulus, and it is close that bipolar resonance can produce negative dynamic mass
Degree.Present invention sound absorption superstructure produces negative dynamic volume modulus and negative dynamic mass density, makes acoustic energy be gathered in sound absorption superjunction
In structure.By acoustic energy near sound absorption superstructure aggregation, blocking sound wave continues to propagate forward the present invention, and then plays the work of noise reduction
With.
Below in conjunction with the accompanying drawings the present invention is further illustrated with specific embodiment.
Description of the drawings
Fig. 1 is a kind of unit cell figure of sound absorption superstructure of the present invention；
Fig. 2 is a kind of sound absorption superstructure of the present invention；
Fig. 3 is a kind of one pole resonance and bipolar resonance mode figure of sound absorption superstructure of the present invention；
Fig. 4 is a kind of sound absorption superstructure transmission function and acoustic pressure field pattern in waveguide of the present invention；
Specific embodiment
Fig. 1 gives a kind of sound absorption superstructure unit cell.Unit cell is regular hexagon.1 is the material area of unit cell, and the material is
The larger material of rigidity (such as iron and steel and aluminium alloy).Regular hexagon unit cell is divided into 12 right angled triangles, each right angle trigonometry
Shape inside is the right angled triangle operatic tunes 2.The right angled triangle operatic tunes 2 is by resonance short tube 3 and the outside UNICOM of sound field 4.Right angle trigonometry
Ideophone chamber 2 constitutes Helmholtz resonant cavities with resonance short tube 3.
Fig. 2 gives a kind of sound absorption superstructure.Sound absorption superstructure is formed by the arrangement of regular hexagon unit cell.5 is regular hexagon
Air-shed.The peripheral ground floor of regular hexagon air-shed 5 is 6 regular hexagon unit cells, and numbering is respectively 6,7,8,9,10 and 11.
The border of each regular hexagon unit cell is parallel with the border of regular hexagon air-shed.The peripheral second layer of regular hexagon air-shed 5
For 12 incomplete regular hexagon unit cells, numbering is 12,13,14,15,16,17,18,19,20,21,22 and 23.Wherein,
12,13,14,15,16 and 17 is the half of positive six deformation unit cells；18,19,20,21,22 and 23 is the 1/3 of positive six deformation unit cells.
The Helmholtz resonant cavities of regular hexagon unit cell are by resonance short tube 3 and the outside UNICOM of sound field 4.
The sound absorption superstructure operation principle of the present invention is as follows：
(1) geometric parameter of the sound absorption superstructure unit cell is a=1mm, b=1mm, t=1mm andl=14/sin (π/3)
mm。
(2) geometric parameter of the sound absorption superstructure is h=0.5mm and R=28.4mm.
(3) by the sound absorption superstructure as in rectangular waveguide.To absorbing sound, superstructure carries out model analysis, the resonance of its one pole and
Bipolar resonance mode is as shown in Figure 3.
One pole resonant frequency shown in Fig. 3 is 369Hz.In one pole resonant frequency, pressure-plotting (Fig. 3 a) shows acoustic energy
Amount is gathered in the central area of sound-absorbing material.Phase diagram (Fig. 3 b) shows that the phase place of the superstructure all directions that absorb sound is approximately equal
's.Therefore, the pressure distribution and phase diagram of one pole resonance shows sound wave with locking phase pattern (Collective in-Phase
Pattern) vibrate, vibration phase is unrelated with angle.Bipolar resonant frequency shown in Fig. 3 is 758Hz.In bipolar resonant frequency,
Pressure-plotting (Fig. 3 c) shows that acoustic energy is gathered in the left and right sides of sound absorption superstructure, and intensity approximately equal.Phase diagram (figure
3d) show, the phase place of the superstructure that the absorbs sound left and right sides is reciprocal into 180 °.Therefore, the pressure distribution and phase diagram of bipolar resonance shows
Show sound wave along sound absorption superstructure the right and left and with 180 ° of reciprocal phase oscillations.
With traditional membranous type resonance sound Meta Materials (Membrane-Type Metamaterials) and tradition Helmholtz
Resonance type acoustic metamaterial (Classical Helmholtz-Type Metamaterials) is compared, and the sound absorption superstructure has
Significantly characteristic.For membranous type resonance Meta Materials, the vibration mode of its single order eigenfrequency is bipolar resonance.Bipolar resonance frequency
Dynamic mass density near rate is negative value, and this can cause Acoustic Wave Propagation to compose the asymmetric peaked Line Profile (Fano- of existing Fano types
like Asymmetric Dip-Peak Profile).However, being limited by film thickness, model resonance material is difficult to obtain single
Resonate pole.The Helmholtz resonant cavity groups that traditional Helmholtz resonance types acoustic metamaterial is distributed by narrow waveguide and preiodic type
Into.The motion of fluid at Helmholtz resonant cavity short tubes can produce vertical vibration form.In such case, Helmholtz resonance
Chamber, to medium radiative acoustic wave around, and then causes one pole to resonate in the form of hemisphere.In one pole near-resonance, dynamic volume modulus
For negative value.Because the Helmholtz resonant cavities of periodic arrangement are to decouple with waveguide, therefore tradition Helmholtz resonance types
Acoustic metamaterial is difficult to obtain bipolar resonance.And there is the sound absorption superstructure of the present invention design one pole to resonate and bipolar common simultaneously
Shake.Similar with Mie resonators, the locking phase of sound wave is propagated the one pole that can cause to absorb sound superstructure and is resonated.Further, since this
The space arrangement of the right angled triangle Helmholtz resonant cavities of bright sound absorption superstructure unit cell is Broken Symmetry (Symmetry-
), therefore the sound absorption superstructure can be considered Broken Symmetry type Meta Materials (symmetry-broken formal broken
metamaterial).The Order Scattering that the unit cell of Broken Symmetry causes can cause bipolar resonance.
The one pole resonance of the sound absorption superstructure and bipolar resonance can respectively cause negative dynamic volume modulus and negative dynamic mass
Density.In the sound absorption superstructure, dynamic voice spread speed cmIt is represented by：
In formula, BmFor dynamic volume modulus, ρmFor dynamic mass density.When dynamic volume modulus BmWith dynamic mass density
ρmFor negative value when, i.e. Bm<0 or ρm<0, then equivalent dynamic voice spread speed cmFor imaginary number.
Wave number k of sound transmissionmIt is represented by：
km=ω/cm
When equivalent dynamic voice spread speed cmFor imaginary number, then wave number k of sound transmissionmAlso it is imaginary number.In this case
Sound wave will be gathered among acoustics superstructure, and cannot continue to propagate forward.
One pole resonates and the normalized frequency of bipolar resonance is
fr1R/c0=0.062
fr2R/c0=0.127
F in formular1And fr2Respectively one pole resonance and bipolar resonance frequency；R is the radius of sound absorption superstructure；c0For sound
Spread speed.
Because standardized frequency is much smaller than 1.Therefore the sound absorption superstructure is sub-wavelength structure, can effective controls ripple
Longer Acoustic Wave Propagation.
(4) up-and-down boundary of the superstructure that absorbs sound is 30mm with the distance of waveguide boundary.In the y-direction, the line of the superstructure that absorbs sound
Filling rate is 62%.The transmission function of sound absorption superstructure is as shown in fig. 4 a.Analysis frequency band is 300Hz-800Hz.In one pole resonance
And bipolar resonant frequency between, sound carry-over factor is less.This shows that sound absorption superstructure has effectively blocked the propagation of sound.
Acoustic pressure field pattern such as Fig. 4 b and 4c of 380Hz and 746Hz (close one pole resonance and bipolar resonant frequency respectively)
It is shown.Acoustic pressure field pattern shows that the acoustic pressure in the superstructure that absorbs sound right side waveguide is respectively lower than -60dB (380Hz) and -70dH
(746Hz).Therefore, incident sound pressure 0dB of the acoustic pressure in the waveguide of right side far below left side waveguide.This show in 380Hz and
746Hz, sound wave is ideally blocked.Additionally, from Fig. 4 b can be observed to absorb sound superstructure center air domain sound pressure amplitude it is big
In 10dB.This shows that the acoustic pressure of the superstructure air-shed that absorbs sound is more than the acoustic pressure of periphery medium, and acoustic energy is gathered in sound absorption superstructure
Central area.Its reason is because one pole resonance can cause negative dynamic volume modulus；Negative dynamic volume modulus causes air to exist
Occurs swelling in the case of extruded.The unit cell that we design is rigid boundary, then prevent the compression and expansion of air.
Such case, acoustic energy can be gathered at the peak value of one pole resonance, i.e., acoustic energy is absorbed sound superstructure center air domain effectively
Absorb.
The sound pressure amplitude that can be observed outside sound absorption superstructure for single cell structure from Fig. 4 c is more than 10dB.This shows that sound absorption is super
The acoustic pressure of structure single cell structure is more than the acoustic pressure of periphery medium, and acoustic energy is gathered in the single cell structure of sound absorption superstructure.Its reason
It is because bipolar resonance can cause negative dynamic mass density, negative dynamic mass density to cause the direction of air acceleration and external drive
Direction it is reciprocal.The unit cell that we design is rigid boundary, then prevent air reverse movement.In such case, acoustic energy is assembled
At the peak value of bipolar resonance, i.e. the acoustic energy superstructure periphery guarantee structure that absorbed sound is effectively absorbed collection.
Finally, in addition it is also necessary to it is noted that listed above is only a specific embodiment of the invention.Obviously, the present invention
Above example is not limited to, there can also be many deformations, such as circle, triangle, four deformations.One of ordinary skill in the art
The all deformations that can directly derive from present disclosure or associate, are considered as protection scope of the present invention.
Claims (9)
1. a kind of sound absorption superstructure, an including regular hexagon air-shed 5,6 of the peripheral ground floor of regular hexagon air-shed 5 are just
Hexagon unit cell (6,7,8,9,10 and 11), 12 incomplete regular hexagon lists of the peripheral second layer of regular hexagon air-shed 5
Born of the same parents (12,13,14,15,16,17,18,19,20,21,22 and 23).The Helmholtz resonant cavities of all unit cells are short by resonating
Pipe and the outside UNICOM of sound field 4.
2. a kind of sound absorption superstructure according to claim 1, it is characterised in that：Sound absorption superstructure center regular hexagon air
Domain 5.
3. a kind of sound absorption superstructure according to claim 1, it is characterised in that：Sound absorption superstructure center regular hexagon air
The peripheral ground floor in domain 5 is formed by 6 regular hexagon unit cells (6,7,8,9,10 and 11) array.
4. a kind of sound absorption superstructure according to claim 1, it is characterised in that：The periphery second of sound absorption superstructure air-shed
Layer is formed by 12 incomplete regular hexagon unit cell (12,13,14,15,16,17,18,19,20,21,22 and 23) arrays.
5., according to the requirement of claim 1 and 2, certain gap is retained between complete and incomplete regular hexagon unit cell.
6. a kind of sound absorption superstructure according to claim 4, it is characterised in that 6 incomplete regular hexagon unit cells (12,
13,14,15,16,17) it is the 1/2 of complete regular hexagon unit cell.
7. a kind of sound absorption superstructure according to claim 4, it is characterised in that 6 incomplete regular hexagon unit cells (18,
19,20,21,22 and 23) be the 1/3 of complete regular hexagon unit cell.
8. a kind of sound absorption superstructure according to claim 3,6 and 7, it is characterised in that：Regular hexagon unit cell is by 12
Right angled triangle is constituted, and two oblique angles of right angled triangle are respectively 30 ° and 60 °, totally one of two neighboring right angled triangle
Long right-angle side, each right angled triangle includes a Helmholtz chamber.
9. a kind of sound absorption superstructure according to claim 3,6 and 7, it is characterised in that：Helmholtz chambers are short by resonating
Pipe and the outside UNICOM of sound field 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610950628.7A CN106652991A (en) | 2016-10-27 | 2016-10-27 | Sound absorption superstructure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610950628.7A CN106652991A (en) | 2016-10-27 | 2016-10-27 | Sound absorption superstructure |
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| Publication Number | Publication Date |
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| CN106652991A true CN106652991A (en) | 2017-05-10 |
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ID=58821431
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| CN201610950628.7A Pending CN106652991A (en) | 2016-10-27 | 2016-10-27 | Sound absorption superstructure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108443631A (en) * | 2018-04-12 | 2018-08-24 | 湖南大学 | A kind of asymmetric acoustic propagation triangle superstructure |
| CN109119059A (en) * | 2018-09-21 | 2019-01-01 | 同济大学 | A kind of double negative acoustic metamaterial structures based on the coupling of Helmholtz acoustic resonator |
| CN110880311A (en) * | 2018-09-05 | 2020-03-13 | 湖南大学 | Underwater sub-wavelength space coiled acoustic metamaterial |
| CN111989740A (en) * | 2018-04-18 | 2020-11-24 | 富士胶片株式会社 | Sound insulation structure |
| WO2021096683A1 (en) * | 2019-11-11 | 2021-05-20 | Toyota Motor Engineering & Manufacturing North America, Inc. | Degenerative sound isolation device |
| CN113808560A (en) * | 2020-06-12 | 2021-12-17 | 香港科技大学 | Ultra-thin broadband underwater sound absorber made of composite metamaterial based on impedance matching |
| WO2023193412A1 (en) * | 2022-04-07 | 2023-10-12 | 同济大学 | Sound absorption and bearing integrated structure and preparation method therefor |
| DE102022129881B4 (en) | 2021-11-15 | 2024-09-12 | Hochschule für Technik und Wirtschaft Dresden, Körperschaft des öffentlichen Rechts | Sound absorption structure |
-
2016
- 2016-10-27 CN CN201610950628.7A patent/CN106652991A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| BAIZHAN XIA, ETC.: "Symmetry-broken metamaterial for blocking, cloaking, and supertunneling of sound in a subwavelength scale", 《AIP出版物数据库》 * |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108443631A (en) * | 2018-04-12 | 2018-08-24 | 湖南大学 | A kind of asymmetric acoustic propagation triangle superstructure |
| CN111989740A (en) * | 2018-04-18 | 2020-11-24 | 富士胶片株式会社 | Sound insulation structure |
| CN111989740B (en) * | 2018-04-18 | 2024-03-22 | 富士胶片株式会社 | Sound insulation structure |
| CN110880311A (en) * | 2018-09-05 | 2020-03-13 | 湖南大学 | Underwater sub-wavelength space coiled acoustic metamaterial |
| CN110880311B (en) * | 2018-09-05 | 2023-08-15 | 湖南大学 | Underwater sub-wavelength space coiling type acoustic metamaterial |
| CN109119059A (en) * | 2018-09-21 | 2019-01-01 | 同济大学 | A kind of double negative acoustic metamaterial structures based on the coupling of Helmholtz acoustic resonator |
| CN109119059B (en) * | 2018-09-21 | 2020-11-27 | 同济大学 | Double-negative-acoustic metamaterial structure based on Helmholtz resonator coupling |
| WO2021096683A1 (en) * | 2019-11-11 | 2021-05-20 | Toyota Motor Engineering & Manufacturing North America, Inc. | Degenerative sound isolation device |
| EP4059008A4 (en) * | 2019-11-11 | 2023-12-06 | Toyota Motor Engineering & Manufacturing North America, Inc. | Degenerative sound isolation device |
| CN113808560A (en) * | 2020-06-12 | 2021-12-17 | 香港科技大学 | Ultra-thin broadband underwater sound absorber made of composite metamaterial based on impedance matching |
| DE102022129881B4 (en) | 2021-11-15 | 2024-09-12 | Hochschule für Technik und Wirtschaft Dresden, Körperschaft des öffentlichen Rechts | Sound absorption structure |
| WO2023193412A1 (en) * | 2022-04-07 | 2023-10-12 | 同济大学 | Sound absorption and bearing integrated structure and preparation method therefor |
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Application publication date: 20170510 |