CN109559728A - Broadband sound absorption structure of zigzag cavity micro-perforated plate - Google Patents
Broadband sound absorption structure of zigzag cavity micro-perforated plate Download PDFInfo
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- CN109559728A CN109559728A CN201811418984.XA CN201811418984A CN109559728A CN 109559728 A CN109559728 A CN 109559728A CN 201811418984 A CN201811418984 A CN 201811418984A CN 109559728 A CN109559728 A CN 109559728A
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- Prior art keywords
- sound absorption
- partition
- bottom plate
- absorption structure
- cavity
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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
- G10K11/162—Selection of materials
-
- 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
-
- 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
- G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
- G10K2210/10—Applications
- G10K2210/118—Panels, e.g. active sound-absorption panels or noise barriers
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention belongs to the field of noise control, and particularly relates to a broadband sound absorption structure of a zigzag cavity micro-perforated plate, which comprises a bottom plate 1, a side wall 2, a partition plate 3, a cover plate 5 and micro-perforations 6. The side wall 2, the bottom plate 1 and the cover plate 5 are tightly connected to form an integral sound absorption back cavity; the partition plates 3 are arranged in the sound absorption back cavity and sequentially and alternately isolate the whole back cavity from the bottom plate 1 into a zigzag cavity 4; the partition boards 3 are sequentially arranged in the back cavity at certain intervals and are tightly connected with the side boards 2, the intervals and the number of the partition boards are adjustable, and the intervals between the adjacent partition boards are the same or similar; a gap is reserved between the partition plate 3 and the cover plate 5, and the height of the gap can be the same as or close to the distance between the partition plates; the cover plate 5 is provided with one or more microperforations 6 of different sizes. The invention not only improves the low-frequency sound absorption coefficient of the composite sound absorption structure, but also effectively widens the sound absorption frequency band of the composite sound absorption structure under the condition of not increasing the thickness of the back cavity of the micro-perforated plate, and has simple structure, low preparation cost, high application value and wide application range.
Description
Technical field
The invention belongs to field of noise control, and in particular to a kind of broadband suction mutually compound with tortuous cavity by microperforated panel
Acoustic form.
Background technique
In field of noise control, sound-absorbing material or structure can be divided into sound-absorbing porous material and resonance sound-absorbing structure two by principle
Major class, common resonance sound-absorbing structure have resonance sound-absorbing structure for sheet, perforated plate (containing micropunch) resonance sound-absorbing structure, slit total
Sound absorption structure of shaking etc..
In engineering, sound-absorbing porous material has good sound absorbing performance, but its to the medium, high frequency sound wave of 1000Hz or more
It is poor to low frequency (1000Hz or less) sound wave sound absorbing performance；In order to solve the problems, such as the sound absorption of low-frequency sound wave, generally require using altogether
Vibration sound absorption structure.But since the resonant frequency of traditional resonance sound-absorbing structure generally depends on back chamber thickness and plate thickness, in order to improve
The sound absorbing performance of low-frequency range needs to increase back chamber thickness or plate thickness, this is unsatisfactory for small size, light weight in structure practical application
With the requirement of low cost；And traditional resonance sound-absorbing structure only has preferable sound absorbing performance near resonant frequency, works as deviation
Its sound absorbing performance can be remarkably decreased when resonant frequency, and sound sucting band is very narrow, be unable to satisfy broad band sound absorption requirement.Microperforated panel resonance
Sound absorption structure is a kind of sound absorption structure for being widely studied and applying, however, in order to realize it to low frequency (1000Hz or less)
And the efficient absorption of broadband sound wave, it usually needs use biggish back chamber thickness (10cm or more), this is limited to a certain extent
Its engineer application.
Existing limitation is designed for current microperforated panel soundabsorbing construction, the present invention is proposed microperforated panel structure and complications
Cavity structure combines, and devises a kind of NEW TYPE OF COMPOSITE sound absorption structure.The compound sound-absorption structural is using tortuous cavity at multiple
Acoustic propagation path is extended, therefore significantly increases the thickness of equivalent back chamber, so that the compound sound-absorption structural is with lesser
General thickness realizes the efficient absorption to broad band low frequency sound wave, overcomes the deficiency of traditional microperforated panel soundabsorbing construction design.
In conclusion, due to being limited by structure design space, weight condition etc., traditional sound absorption structure is difficult to reality in engineering
Now to the efficient sound absorption effect of low frequency, broadband sound wave.And low frequency, broadband sound absorption are the technologies that those skilled in the art extremely pay close attention to
Problem, and disclosed in the present invention currently without document and realize broad band low frequency sound absorption using tortuous cavity and microperforated panel are mutually compound
Method.
Summary of the invention
The purpose of the present invention is to solve the deficiencies in above-mentioned background technique, provide a kind of simple and reasonable complications
Cavity microperforated panel broadband sound absorption structure, extends acoustic propagation path by tortuous cavity at double, so that low-frequency sound wave can be improved
Sound absorbing performance, and can effectively widen wide band sound absorption, and be further without and additional increase architecture quality and volume.
The technical solution adopted by the present invention is that: the broadband sound absorption structure includes that bottom plate 1 (can be by mounting wall in practical application
Face replacement), side wall 2, partition 3, cover board 5, micropunch 6.The side wall 2 is closely connect with bottom plate 1 and cover board 5, surrounds whole suction
Sound carries on the back chamber；The partition 3 is placed in sound absorption and carries on the back intracavitary portion, and Integral back chamber is isolated into the concatenated sub- cavity of multiple complications, these strings
The sub- cavity of connection constitutes tortuous cavity 4 together；One or more various sizes of micropunch 6 are provided on the cover board 5.
Further, the side wall 2 passes through welding or cementing close connection with bottom plate 1 and cover board 5.
Further, the tortuous cavity microperforated panel broadband sound absorption structure, which is characterized in that the knot of the bottom plate 1
Configuration formula is thin layer plate structure, and cross sectional shape can be square, rectangle or circle.
Further, the tortuous cavity microperforated panel broadband sound absorption structure, which is characterized in that the knot of the side wall 2
Configuration formula is thin layer plate structure, and cross sectional shape can be square, rectangle or circle, and side wall 2 is perpendicular to 1 side of bottom plate
To 1 inside of size and bottom plate it is identical the vertical range between 5 inside of panel.
Further, the structure type of the partition 3 is thin layer plate structure, and thickness can be 0.3mm-3mm；Partition 3
It being successively arranged at a certain distance and carries on the back intracavitary and closely connect with side plate 2, its spacing and quantity are adjustable, the partition more than 3 added,
The resonant frequency of sound absorption is lower, and the spacing of adjacent separator is answered same or similar；Partition 3 successively alternately with bottom plate 1 and cover board 5 there are
The height in gap, gap can be same or similar with the spacing between partition.
Further, the tortuous cavity 4 is in the thickness (i.e. whole sound absorption back chamber thickness) perpendicular to 1 direction of bottom plate
It is identical in the size perpendicular to 1 direction of bottom plate as side wall 2.
Further, side (being located above single sub- cavity) is provided with one or more different sizes on the cover board 5
Micropunch 6, the arrangement mode in hole can be periodically, is also possible to acyclic；Punching rate can be 0.8%-
10%, aperture can be 0.1-2mm, and the cross sectional shape in hole can be round, rectangular, triangle or irregular shape etc..
Further, the partition 3 is made of hard material (such as metal, rigid plastics, resin).
Further, the cover board 5 is made of metal material (such as aluminium alloy, steel).
The present invention has the following technical effect that broadband of the present invention for structure absorbs sound, in the volume and lid of tortuous cavity 4
In the case that the thickness of plate 5 is constant, by rationally adjusting the structure and arrangement of partition 3 and micropunch 6, sound absorption knot is both significantly improved
Structure has effectively widened the wide band sound absorption of structure to the sound absorbing performance of low-frequency sound wave.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described.Following attached drawings are only some embodiments of the present invention, not right
The present invention imposes any restrictions.
Fig. 1 is a kind of schematic diagram of tortuous cavity microperforated panel broadband sound absorption structure of the invention.
Fig. 2 is three kinds of representative shape schematic diagrames of insole board of the present invention.
Fig. 3 is the arrangement form schematic diagram of micropunch in the present invention.
Fig. 4 is four kinds of representative section schematic shapes of micropunch in the present invention.
Fig. 5 is the absorption coefficient curve figure of sound absorption structure of the present invention.
Attached drawing remarks: 1- bottom plate, 2- side wall, 3- partition, 4- complications cavity, 5- cover board, 6- micropunch.
Specific embodiment
To keep the purposes, technical schemes and advantages implemented of the present invention relatively sharp, with reference to the accompanying drawing, illustrative examples
And its present invention is further explained in explanation.
The present invention provides a kind of tortuous cavity microperforated panel broadband sound absorption structures, can effectively improve structure to low frequency
The acoustical absorptivity of sound wave, and wide band sound absorption can be effectively widened, and be further without the additional quality and volume for increasing structure.
Referring to Fig.1, the present invention provides a kind of tortuous cavity microperforated panel broadband sound absorption structure, the sound absorption structure includes
Bottom plate 1, side wall 2, partition 3, cover board 5 and micropunch 6.The side wall 2 is closely connect with bottom plate 1, cover board 5, surrounds whole sound absorption
Carry on the back chamber；The partition 3 is placed in sound absorption and carries on the back intracavitary portion, and Integral back chamber is isolated into the concatenated sub- cavity of multiple complications, these series connection
Sub- cavity constitute tortuous cavity 4 together；One or more various sizes of micropunch 6 are provided on the cover board 5.
Preferably, the side wall 2 surrounds whole sound absorption back with bottom plate 1, cover board 5 by closely connecting (welding or cementing)
Chamber.
Preferably, the structure type of the bottom plate 1 is thin layer plate structure, and cross sectional shape can be square, rectangle
Or round (referring to Fig. 2).
Preferably, the structure type of the side wall 2 is thin layer plate structure, and cross sectional shape can be square, rectangle
Or round (referring to Fig. 2), and the hanging down between 5 inside of the size perpendicular to 1 direction of bottom plate and 1 inside of bottom plate and panel of side wall 2
Directly apart from identical.
Preferably, the structure type of the partition 3 is thin layer plate structure, and thickness can be 0.3mm-3mm；Partition 3 is pressed
One fixed spacing, which is successively arranged in, to be carried on the back intracavitary and closely connect with side plate 2, and its spacing and quantity are adjustable, the partition more than 3 added, and inhale
The resonant frequency of sound is lower, and the spacing of adjacent separator is answered same or similar；Partition 3 successively alternately and bottom plate 1 and cover board 5 there are
The height of gap, gap can be same or similar with the spacing between partition (referring to Fig.1).
Preferably, the tortuous cavity 4 perpendicular to 1 direction of bottom plate thickness (i.e. whole sound absorption back chamber thickness) with
Side wall 2 is identical in the size perpendicular to 1 direction of bottom plate.
Preferably, side on the cover board 5 (being located above single sub- cavity) is provided with one or more various sizes of
Micropunch 6, the arrangement mode in hole can be periodically, be also possible to acyclic；Punching rate can be 0.8%-10%,
Aperture can be 0.1-2mm, and the cross sectional shape in hole can be round, rectangular, triangle or irregular shape etc. (referring to Fig. 3, Fig. 4).
Preferably, the partition 3 is made of hard material (such as metal, rigid plastics, resin).
Preferably, the cover board 5 is made of metal material (such as aluminium alloy or steel).
Tortuous cavity microperforated panel broadband sound absorption structure provided by the invention is carried out below in conjunction with specific embodiment detailed
Explanation.
Preferred embodiment of the present invention, side wall 2 and bottom plate 1, cover board 5 surround whole sound absorption back chamber by cementing fixation.Bottom
The structure type of plate 1 is thin layer plate structure, and its cross sectional shape is square, thickness 1mm, length and width having a size of
60mm×60mm.The structure type of side plate 2 is thin layer plate structure, and its cross sectional shape is rectangle, and thickness is
1mm, length and width is having a size of 60mm × 50mm (side wall 2 is width in the size perpendicular to 1 direction of bottom plate at this time).The structure of partition 3
Form is thin layer plate structure, and its cross sectional shape is rectangle, and with a thickness of 0.5mm, length and width is having a size of 60mm × 45mm.Every
Plate 3 is intracavitary and closely connect that (partition quantity is 3, adjacent separator spacing is with side plate 2 by Integral back is equidistantly successively arranged in
15mm), and partition 3 successively alternately there are the gaps of 15mm with bottom plate 1 and cover board 5；Integral back chamber has been isolated into three by partition 3
Tortuous concatenated sub- cavity, these concatenated sub- cavitys constitute tortuous cavity 4 together.Tortuous cavity 4 is perpendicular to 1 direction of bottom plate
Thickness (i.e. whole sound absorption back chamber thickness) and side wall 2 in the size perpendicular to 1 direction of bottom plate identical, value 50mm.
It is circular micropunch 6, the arrangement side in hole that side, which (is located above single sub- cavity) setting there are two types of cross sectional shape, on cover board 5
Formula can be periodically；The diameter in hole is respectively 0.9mm, 0.4mm, punching rate 3%.Partition 3 is formed from a resin, cover board 5
It is made of aluminium alloy.
The sound absorption characteristics curve of the present embodiment is referring to Fig. 5, the results show that the sound absorption structure provided in the present embodiment is in 370-
There is good sound absorption effect in 840Hz frequency range, realizes broad band low frequency and efficiently absorb sound.
The above, the only present invention preferably one of specific embodiment, but protection scope of the present invention is not limited to
In this.It is all to utilize the principle of the present invention or marrow, made any variation, same replacement, improvement etc., belong to protection of the present invention
Range.
Claims (13)
1. a kind of complications cavity microperforated panel broadband sound absorption structure, it is characterized in that: the broadband sound absorption structure include bottom plate (1),
Side wall (2), partition (3), cover board (5), micropunch (6), the side wall (2) closely connect with bottom plate (1) and cover board (5), surround
Whole sound absorption back chamber；The partition (3) is placed in sound absorption and carries on the back intracavitary portion, and it is empty that Integral back chamber is isolated into the concatenated son of multiple complications
Chamber, these concatenated sub- cavitys constitute tortuous cavity (4) together；One or more different sizes are provided on the cover board (5)
Micropunch (6).
2. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the bottom plate
(1) structure type is thin layer plate structure, the regular shapes such as cross sectional shape can be square, rectangle or circle.
3. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the side wall
(2) structure type is thin layer plate structure, the regular shapes such as cross sectional shape can be square, rectangle or circle, and side
Wall (2) is identical as the vertical range on the inside of bottom plate (1) between cover board (5) inside in the size perpendicular to bottom plate (1) direction.
4. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the partition
(3) structure type is thin layer plate structure, and thickness can be 0.3mm-3mm；Partition (3) is successively arranged in back at a certain distance
Intracavitary and closely connect with side plate (2), its spacing and quantity are adjustable, and the spacing of adjacent separator is answered same or similar；Partition (3) according to
There are gaps for secondary alternating and bottom plate (1) and cover board (5), and the height in gap can be same or similar with the spacing between partition.
5. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the complications
Cavity (4) is in the thickness (i.e. whole sound absorption back chamber thickness) perpendicular to bottom plate (1) direction with side wall (2) perpendicular to bottom plate
(1) size in direction is identical.
6. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the cover board
(5) side (being located above single sub- cavity) is provided with one or more various sizes of micropunch (6), the arrangement side in hole on
Formula can be periodically, be also possible to acyclic；Punching rate can be 0.8%-10%, and aperture can be 0.1-2mm, hole
Cross sectional shape can be round, rectangular, triangle or irregular shape etc..
7. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the partition
(3) it is made of hard material.
8. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the cover board
(5) it is made of metal material.
9. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the partition
(3) it can be made of metal, rigid plastics, resin etc..
10. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the lid
Plate (5) can be made of aluminium alloy, steel etc..
11. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the side
Wall (2) and bottom plate (1) and cover board (5) pass through welding or cementing close connection.
12. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 4, it is characterised in that: the increasing
If partition (3) it is more, the resonant frequency of sound absorption is lower.
13. a kind of tortuous cavity microperforated panel broadband sound absorption structure according to claim 1, it is characterised in that: the bottom
Plate (1) can be replaced in practical applications by installation wall surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811418984.XA CN109559728A (en) | 2018-11-26 | 2018-11-26 | Broadband sound absorption structure of zigzag cavity micro-perforated plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811418984.XA CN109559728A (en) | 2018-11-26 | 2018-11-26 | Broadband sound absorption structure of zigzag cavity micro-perforated plate |
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| CN109559728A true CN109559728A (en) | 2019-04-02 |
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| CN201811418984.XA Pending CN109559728A (en) | 2018-11-26 | 2018-11-26 | Broadband sound absorption structure of zigzag cavity micro-perforated plate |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110517659A (en) * | 2019-08-20 | 2019-11-29 | 西安交通大学 | A kind of multiple-unit manifold type microperforated panel broad band low frequency sound absorption structure and its design method |
| CN110767207A (en) * | 2019-10-30 | 2020-02-07 | 哈尔滨工程大学 | Ultra-thin many absorption peak low frequency sound absorber |
| CN111489732A (en) * | 2020-03-16 | 2020-08-04 | 中国农业大学 | Acoustic super surface, design method thereof and acoustic device |
| CN112185331A (en) * | 2020-09-29 | 2021-01-05 | 西南大学 | Porous mixed channel ultra wide band sound absorption structure |
| CN112185332A (en) * | 2020-09-29 | 2021-01-05 | 西南大学 | Porous flexible FP passageway self-adaptation broadband sound absorbing structure |
| CN112289294A (en) * | 2020-09-07 | 2021-01-29 | 南京航空航天大学 | Underwater sound absorption structure with fish scale-shaped partition board filled with viscoelastic material |
| CN112712784A (en) * | 2020-11-30 | 2021-04-27 | 南京大学 | Low-frequency broadband flat plate sound absorption structure |
| CN113124256A (en) * | 2021-04-09 | 2021-07-16 | 株洲时代新材料科技股份有限公司 | Method for improving noise reduction effect of low-frequency noise reduction liner of pipeline and sound liner |
| CN113327568A (en) * | 2021-05-01 | 2021-08-31 | 西北工业大学 | Perforated plate structure and low-frequency broadband sound absorption device with variable-section bent cavity applying same |
| CN113808565A (en) * | 2021-07-29 | 2021-12-17 | 北京航空航天大学 | Back cavity perforated partition plate nozzle capable of improving sound absorption capacity |
| CN115331651A (en) * | 2022-08-09 | 2022-11-11 | 四川大学 | Low-frequency vibration-damping sound-absorbing integrated phononic crystal composite noise reduction structure and design method |
| CN117211427A (en) * | 2023-11-09 | 2023-12-12 | 迈默智塔(无锡)科技有限公司 | Broad-width silencing device for building and noise reduction plate |
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Cited By (17)
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|---|---|---|---|---|
| CN110517659A (en) * | 2019-08-20 | 2019-11-29 | 西安交通大学 | A kind of multiple-unit manifold type microperforated panel broad band low frequency sound absorption structure and its design method |
| CN110517659B (en) * | 2019-08-20 | 2022-07-12 | 西安交通大学 | Multi-unit coupling type micro-perforated plate low-frequency broadband sound absorption structure and design method thereof |
| CN110767207B (en) * | 2019-10-30 | 2023-09-29 | 哈尔滨工程大学 | Ultrathin multi-absorption peak low-frequency sound absorber |
| CN110767207A (en) * | 2019-10-30 | 2020-02-07 | 哈尔滨工程大学 | Ultra-thin many absorption peak low frequency sound absorber |
| CN111489732A (en) * | 2020-03-16 | 2020-08-04 | 中国农业大学 | Acoustic super surface, design method thereof and acoustic device |
| CN111489732B (en) * | 2020-03-16 | 2024-01-19 | 中国农业大学 | Acoustic super-surface and design method thereof and acoustic device |
| CN112289294A (en) * | 2020-09-07 | 2021-01-29 | 南京航空航天大学 | Underwater sound absorption structure with fish scale-shaped partition board filled with viscoelastic material |
| CN112185331A (en) * | 2020-09-29 | 2021-01-05 | 西南大学 | Porous mixed channel ultra wide band sound absorption structure |
| CN112185332A (en) * | 2020-09-29 | 2021-01-05 | 西南大学 | Porous flexible FP passageway self-adaptation broadband sound absorbing structure |
| CN112185331B (en) * | 2020-09-29 | 2022-07-05 | 西南大学 | Porous mixed channel ultra wide band sound absorption structure |
| CN112712784A (en) * | 2020-11-30 | 2021-04-27 | 南京大学 | Low-frequency broadband flat plate sound absorption structure |
| CN113124256A (en) * | 2021-04-09 | 2021-07-16 | 株洲时代新材料科技股份有限公司 | Method for improving noise reduction effect of low-frequency noise reduction liner of pipeline and sound liner |
| CN113327568A (en) * | 2021-05-01 | 2021-08-31 | 西北工业大学 | Perforated plate structure and low-frequency broadband sound absorption device with variable-section bent cavity applying same |
| CN113808565A (en) * | 2021-07-29 | 2021-12-17 | 北京航空航天大学 | Back cavity perforated partition plate nozzle capable of improving sound absorption capacity |
| CN113808565B (en) * | 2021-07-29 | 2024-02-06 | 北京航空航天大学 | Back cavity perforation baffle nozzle capable of improving suction capacity |
| CN115331651A (en) * | 2022-08-09 | 2022-11-11 | 四川大学 | Low-frequency vibration-damping sound-absorbing integrated phononic crystal composite noise reduction structure and design method |
| CN117211427A (en) * | 2023-11-09 | 2023-12-12 | 迈默智塔(无锡)科技有限公司 | Broad-width silencing device for building and noise reduction plate |
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Application publication date: 20190402 |