CN108922510A - The sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure - Google Patents
The sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure Download PDFInfo
- Publication number
- CN108922510A CN108922510A CN201810791875.6A CN201810791875A CN108922510A CN 108922510 A CN108922510 A CN 108922510A CN 201810791875 A CN201810791875 A CN 201810791875A CN 108922510 A CN108922510 A CN 108922510A
- Authority
- CN
- China
- Prior art keywords
- sound
- porous material
- resonant cavity
- absorbing porous
- absorbing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Sound absorption structure is mixed with the wideband of resonance sound-absorbing structure parallel connection by sound-absorbing porous material the invention discloses a kind of, the more porous sound absorption structure of sound sucting band is wide, has better sound absorption effect, and can adjust low frequency high acoustic absorption effect location according to actual needs.This mixing sound absorption structure in parallel includes sound-absorbing porous material and resonance sound-absorbing structure, and due to being that resonance sound-absorbing structure is embedded in inside sound-absorbing porous material, entire sound absorption structure does not change on thickness.Resonance sound-absorbing structure has good sound absorption effect to low frequency, multiple sound absorption peak values can be generated in low frequency by the resonance sound-absorbing structure of multiple and different resonant frequencies in parallel, entire mixing sound absorption structure in parallel can guarantee the good sound absorbing performance of sound-absorbing porous material in medium-high frequency and have good sound absorption effect in low frequency.
Description
Technical field
The present invention relates to a kind of sound absorption structures, and in particular to one kind is used for aviation, navigation, vehicle and building, in wideband
Efficient sound absorption structure with acoustic absorptivity with higher in range.
Background technique
With the rapid development of the vehicles such as China's aviation, navigation, automobile, problem of noise pollution is more obvious.Currently,
In these fields to the receiving surface laying sound-absorbing material absorption acoustic wave energy that the measure of noise reduction is mainly in sound.
Existing sound absorption structure is varied, but to sum up has following insufficient：
1) there is specific sound absorption frequency range；For example, sound absorption frequency range quartile is in medium-high frequency section, and it is anti-to all-bottom sound
It answers relatively blunt；
2) sound sucting band is relatively narrow, and the sound absorption effect decline other than peak value is obvious
3) performances such as fire prevention, anti-corrosion, Moisture-proof lamp are poor and environmental pollution is more serious, therefore by environmental condition when application
Limitation.
4) 3 are not avoided) described problem, and some new material higher costs used, using also not universal.
Summary of the invention
The object of the present invention is to provide a kind of sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure, features
It is:Mixing sound absorption structure is formed by sound-absorbing porous material, resonant cavity and insertion tube.
The sound-absorbing porous material is hollow cylindrical body.The hollow cylindrical body has cylindrical cavity.This is hollow
Cylindrical member at one end is open end, the other end is circular bottom surface.
The resonant cavity is and the matched hollow cylindrical body in the inner cavity of sound-absorbing porous material.The sound-absorbing porous material set
Outside resonant cavity.Described resonant cavity one end is that the open end concordant with open end, the other end are contacted with resonance bottom of chamber portion
Bottom end.
Open end and open end are fixed on wall surface.
The center of the bottom surface of the sound-absorbing porous material has a through-hole.The bottom end of the resonant cavity also have one with
The matched through-hole of through-hole on bottom surface.The through-hole is penetrated for insertion tube.The insertion tube is the cylindrical tube of open at both ends.
Described insertion tube one end is inserted into resonant cavity, the other end is concordant with bottom surface.
It is worth noting that realizing the sound sucting band for adjusting low frequency by adjusting insertion length of tube and diameter.Porous sound absorption
The cylinder height of material is 70mm；The depth of resonant cavity is 50mm；Insertion pipe diameter is 20mm, and length is 20~65mm.
Further, a kind of sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure, it is characterised in that:By porous
Sound-absorbing material, several resonant cavities and several insertion tubes composition mixing sound absorption structure.
The sound-absorbing porous material is cuboid.Cuboid one end is lower end surface, the other end is upper surface.The porous suction
Sound material internal has several cylindrical hollow inner cavities.The outlet of these hollow cavities is in the lower end surface.
The resonant cavity is and the matched hollow cylindrical body in the inner cavity of sound-absorbing porous material.The quantity of the resonant cavity with
The lumen number of sound-absorbing porous material is identical.The sound-absorbing porous material covers outside resonant cavity.Described resonant cavity one end be with
The concordant open end in the lower end surface, the other end are the bottom ends contacted with resonance bottom of chamber portion.
The mixing sound absorption structure is mounted on wall surface.The lower end surface and open end are fixed on wall surface.It is described porous
The upper surface of sound-absorbing material has through-hole identical with resonant cavity quantity.The bottom end of each resonant cavity also has one and upper surface
On the matched through-hole of through-hole.The through-hole is penetrated for insertion tube.
The insertion tube is the cylindrical tube of open at both ends.The quantity of the insertion tube is identical as resonant cavity quantity.It is each
A insertion tube one end is inserted into resonant cavity, the other end is concordant with bottom surface.
The sound-absorbing porous material is made of porosity of 0.75~0.90 polyurethane foamed material.
The mixing sound absorption structure in parallel of invention has the advantage that：
1) resonance sound-absorbing structure can form sound absorption peak value in low frequency；
2) the resonance sound-absorbing frequency of resonance sound-absorbing structure can select by adjusting insertion length of tube；
3) sound absorption structure also ensures the height of medium-high frequency sound-absorbing porous material while improving low frequency absorption coefficient
Acoustic absorptivity.
Detailed description of the invention
Fig. 1 is the basic structure schematic diagram of mixing sound absorption structure in parallel of the invention.
Fig. 2 is the sound absorption plane that multiple basic structure parallel connections are formed.
Fig. 3 is acoustic absorptivity Experimental Comparison figure of the insertion tube of mixing sound absorption structure in parallel in four kinds of different lengths.
In figure：Wall surface (1), open end (201), circular bottom surface (202), resonant cavity (3), is inserted sound-absorbing porous material (2)
Enter pipe (4)；Alphabetical I is directed toward open end (201), and letter e is directed toward circular bottom surface (202)；Alphabetical A and A-A is direction view mark.
Wall surface (10), sound-absorbing porous material (20), lower end surface (2010), upper surface (2020), resonant cavity (30), open end
(3010), bottom end (3020), insertion tube (40)；Letter b and B-B are direction view mark.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention only
It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used
With means, various replacements and change are made, should all include within the scope of the present invention.
Embodiment 1：
Referring to Fig. 1, a kind of mixing sound absorption structure that sound-absorbing porous material is in parallel with resonant structure, it is characterised in that:By more
Hole sound absorbing material 2, resonant cavity 3 and the composition mixing sound absorption structure of insertion tube 4.
The sound-absorbing porous material 2 is hollow cylindrical body.The hollow cylindrical body has cylindrical cavity.This is hollow
Cylindrical member at one end is open end 201, the other end is circular bottom surface 202.
The resonant cavity 3 is and the matched hollow cylindrical body in the inner cavity of sound-absorbing porous material 2.The sound-absorbing porous material
2 sets outside resonant cavity 3.Described 3 one end of resonant cavity is that the open end 301 concordant with open end 201, the other end are and resonant cavity
The bottom end 302 of 3 bottoms contact.
Open end 201 and open end 301 are fixed on wall surface 1.
The center of the bottom surface 202 of the sound-absorbing porous material 2 has a through-hole.The bottom end 302 of the resonant cavity 3 also has
There are one and the matched through-hole of through-hole on bottom surface 202.The through-hole is penetrated for insertion tube 4.The insertion tube 4 is spacious for both ends
The cylindrical tube of mouth.Described 4 one end of insertion tube is inserted into resonant cavity 3, the other end is concordant with bottom surface 102.Resonant cavity 3 and insertion tube
4 be all made of to have pvc pipe.
Fig. 3 is acoustic absorptivity Experimental Comparison figure of the insertion tube of mixing sound absorption structure in parallel in four kinds of different lengths.
In this test, testing equipment is the 4206 impedance tube external member of Type of B&K company, the exemplar parameter used in test
For：Sound-absorbing porous material is the polyurethane foam that porosity is 0.75~0.90, and the height of diameter 100mm, cylindrical body are
70mm；The diameter of resonant cavity is 40mm, depth 50mm；The insertion pipe diameter of resonant cavity be 20mm, length be respectively 25mm,
31mm, 46mm and 50mm.
Embodiment 2：
Referring to fig. 2, a kind of sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure, it is characterised in that：It is a kind of
The sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure, it is characterised in that:By sound-absorbing porous material 20, several resonance
Chamber 30 and the composition mixing sound absorption structure of several insertion tubes 40.
The sound-absorbing porous material 20 is cuboid.Cuboid one end is lower end surface 2010, the other end is upper surface 2020.
There are several cylindrical hollow inner cavities inside the sound-absorbing porous material 20.The outlet of these hollow cavities is in the lower end surface
2010。
The resonant cavity 30 is and the matched hollow cylindrical body in the inner cavity of sound-absorbing porous material 20.The resonant cavity 30
Quantity is identical as the lumen number of sound-absorbing porous material 20.20 sets of the sound-absorbing porous material is outside resonant cavity 30.It is described total
It is the bottom end contacted with 30 bottom of resonant cavity that vibration 30 one end of chamber, which is the open end 3010 concordant with the lower end surface 2010, the other end,
3020。
The mixing sound absorption structure is mounted on wall surface 10.The lower end surface 2010 and open end 3010 are fixed on wall surface 10
On.The upper surface 2020 of the sound-absorbing porous material 20 has through-hole identical with 30 quantity of resonant cavity.Each resonant cavity 30
Bottom end 3020 also has one and the matched through-hole of through-hole on upper surface 2020.The through-hole is penetrated for insertion tube 40.
The insertion tube 40 is the cylindrical tube of open at both ends.The quantity of the insertion tube 40 and 30 quantity phase of resonant cavity
Together.Each 40 one end of insertion tube is inserted into resonant cavity 30, the other end is concordant with bottom surface 1020.Resonant cavity 3 and insertion tube 4 are all
There is pvc pipe to be made.
Claims (3)
1. a kind of sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure, it is characterised in that:By the porous sound absorption
Material (2), resonant cavity (3) and insertion tube (4) composition mixing sound absorption structure.
The sound-absorbing porous material (2) is hollow cylindrical body；The hollow cylindrical body has cylindrical cavity；The hollow circle
Cylinder one end is open end (201), the other end is circular bottom surface (202)；
The resonant cavity (3) is and the matched hollow cylindrical body in the inner cavity of sound-absorbing porous material (2)；The sound-absorbing porous material
(2) it covers external in resonant cavity (3)；It is together that described resonant cavity (3) one end, which is with open end (201) open end (301), the other end,
The bottom end (302) of vibration chamber (3) bottom contact；
Open end (201) and open end (301) are fixed on wall surface (1)；
The center of the bottom surface (202) of the sound-absorbing porous material (2) has a through-hole；The bottom end (302) of the resonant cavity (3)
Also there is one and the matched through-hole of through-hole on bottom surface (202)；The through-hole is penetrated for insertion tube (4)；The insertion tube
It (4) is the cylindrical tube of open at both ends；In insertion tube (4) one end insertion resonant cavity (3).
2. a kind of sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure, it is characterised in that：By the porous sound absorption
Material (20), several resonant cavities (30) and several insertion tubes (40) composition mixing sound absorption structure.
The sound-absorbing porous material (20) is cuboid；Cuboid one end is lower end surface (2010), the other end is upper surface
(2020)；There are several cylindrical hollow inner cavities inside the sound-absorbing porous material (20)；The outlet of these hollow cavities exists
The lower end surface (2010)；
The resonant cavity (30) is and the matched hollow cylindrical body in the inner cavity of sound-absorbing porous material (20)；The resonant cavity (30)
Quantity it is identical as the lumen number of sound-absorbing porous material (20)；The sound-absorbing porous material (20) cover resonant cavity (30) outside
Portion；Described resonant cavity (30) one end is to be and resonant cavity (30) bottom with the lower end surface (2010) open end (3010), the other end
The bottom end (3020) of portion's contact；
The mixing sound absorption structure is mounted on wall surface (10)；The lower end surface (2010) and open end (3010) are fixed on wall surface
(10) on；The upper surface (2020) of the sound-absorbing porous material (20) has through-hole identical with resonant cavity (30) quantity；Each
The bottom end (3020) of resonant cavity (30) also has one and the matched through-hole of through-hole on upper surface (2020)；The through-hole supplies
Insertion tube (40) penetrates；
The insertion tube (40) is the cylindrical tube of open at both ends；The quantity of the insertion tube (40) and resonant cavity (30) quantity phase
Together；Each insertion tube (40) one end is inserted into resonant cavity (30).
3. a kind of sound-absorbing porous material according to claim 1 mixing sound absorption structure in parallel with resonant structure, feature
It is：The sound-absorbing porous material (2) is made of porosity of 0.75~0.90 polyurethane foamed material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810791875.6A CN108922510B (en) | 2018-07-18 | 2018-07-18 | Mixed sound absorption structure with porous sound absorption material and resonance structure connected in parallel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810791875.6A CN108922510B (en) | 2018-07-18 | 2018-07-18 | Mixed sound absorption structure with porous sound absorption material and resonance structure connected in parallel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108922510A true CN108922510A (en) | 2018-11-30 |
| CN108922510B CN108922510B (en) | 2023-08-15 |
Family
ID=64414003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810791875.6A Active CN108922510B (en) | 2018-07-18 | 2018-07-18 | Mixed sound absorption structure with porous sound absorption material and resonance structure connected in parallel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108922510B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613481A (en) * | 2019-01-10 | 2019-04-12 | 重庆大学 | A kind of Wave beam forming identification of sound source method adapting to wind tunnel test environment |
| CN110397505A (en) * | 2019-07-11 | 2019-11-01 | 上海交通大学 | A kind of extension cast perforated plate honeycomb interlayer sound absorption structure |
| CN111696511A (en) * | 2020-01-17 | 2020-09-22 | 南京大学 | Laying method for improving random incidence sound absorption performance of resonance sound absorber array |
| CN112227237A (en) * | 2020-11-10 | 2021-01-15 | 广州地铁设计研究院股份有限公司 | Sound barrier containing air resonant cavity |
| CN112447162A (en) * | 2019-08-29 | 2021-03-05 | 比亚迪股份有限公司 | Sound absorption structure design method, sound absorption structure and acoustic bag structure |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11259076A (en) * | 1998-03-16 | 1999-09-24 | Mitsubishi Motors Corp | Structure of sound absorbing material |
| CN1626780A (en) * | 2003-12-12 | 2005-06-15 | 丰田自动车株式会社 | Exhaust muffling device |
| JP2006085184A (en) * | 2000-09-29 | 2006-03-30 | Kobe Steel Ltd | Porous soundproof structure and method of manufacturing the same |
| JP2008076870A (en) * | 2006-09-22 | 2008-04-03 | Swcc Showa Device Technology Co Ltd | Sound absorber and sound absorbing structure using the same |
| CN101645263A (en) * | 2009-02-27 | 2010-02-10 | 中国科学院声学研究所 | Composite resonance sound absorption device of tube bundle perforated plate |
| CN101727894A (en) * | 2010-01-08 | 2010-06-09 | 中国科学院声学研究所 | Composite sound absorbing device with built-in resonant cavity |
| CN102016977A (en) * | 2008-03-03 | 2011-04-13 | 3M创新有限公司 | Process for audible acoustic frequency management in gas flow systems |
| CN103700366A (en) * | 2013-12-24 | 2014-04-02 | 江苏大学 | Wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates |
| CN203673822U (en) * | 2013-12-24 | 2014-06-25 | 江苏大学 | Wideband sound absorption structure realized through combining mechanical impedance of composite resonator with micropunch plate |
| CN104464709A (en) * | 2014-11-03 | 2015-03-25 | 江苏大学 | Variable-damping mechanical impedance combined sound absorption structure |
| CN104616648A (en) * | 2014-12-26 | 2015-05-13 | 北京市劳动保护科学研究所 | Composite sound absorption plate |
| CN105118497A (en) * | 2015-09-18 | 2015-12-02 | 贵州大学 | Tube-bundle perforated panel and spring cyclic structure sound absorption apparatus |
| JP2016027401A (en) * | 2014-07-01 | 2016-02-18 | 株式会社日本コンポジット工業 | Sound absorption structure |
| JP2016177117A (en) * | 2015-03-20 | 2016-10-06 | 克己 櫂谷 | Thin plate-like sound absorbing structure and method of manufacturing the same |
| CN206134247U (en) * | 2016-10-09 | 2017-04-26 | 四川中车复合材料结构有限公司 | Novel compound acoustic baffle of foamed aluminium |
| CN106652989A (en) * | 2017-01-18 | 2017-05-10 | 江苏大学 | Mechanical impedance plate composite porous elastic tube sound absorbing structure |
| CN206451511U (en) * | 2017-01-18 | 2017-08-29 | 江苏大学 | A kind of compound porous elastic tube sound absorption structure of mechanical impedance plate |
| CN107437411A (en) * | 2016-05-27 | 2017-12-05 | 北京市劳动保护科学研究所 | A kind of low frequency composite sound absorbing device |
-
2018
- 2018-07-18 CN CN201810791875.6A patent/CN108922510B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11259076A (en) * | 1998-03-16 | 1999-09-24 | Mitsubishi Motors Corp | Structure of sound absorbing material |
| JP2006085184A (en) * | 2000-09-29 | 2006-03-30 | Kobe Steel Ltd | Porous soundproof structure and method of manufacturing the same |
| CN1626780A (en) * | 2003-12-12 | 2005-06-15 | 丰田自动车株式会社 | Exhaust muffling device |
| JP2008076870A (en) * | 2006-09-22 | 2008-04-03 | Swcc Showa Device Technology Co Ltd | Sound absorber and sound absorbing structure using the same |
| CN102016977A (en) * | 2008-03-03 | 2011-04-13 | 3M创新有限公司 | Process for audible acoustic frequency management in gas flow systems |
| CN101645263A (en) * | 2009-02-27 | 2010-02-10 | 中国科学院声学研究所 | Composite resonance sound absorption device of tube bundle perforated plate |
| CN101727894A (en) * | 2010-01-08 | 2010-06-09 | 中国科学院声学研究所 | Composite sound absorbing device with built-in resonant cavity |
| CN203673822U (en) * | 2013-12-24 | 2014-06-25 | 江苏大学 | Wideband sound absorption structure realized through combining mechanical impedance of composite resonator with micropunch plate |
| CN103700366A (en) * | 2013-12-24 | 2014-04-02 | 江苏大学 | Wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates |
| JP2016027401A (en) * | 2014-07-01 | 2016-02-18 | 株式会社日本コンポジット工業 | Sound absorption structure |
| CN104464709A (en) * | 2014-11-03 | 2015-03-25 | 江苏大学 | Variable-damping mechanical impedance combined sound absorption structure |
| CN104616648A (en) * | 2014-12-26 | 2015-05-13 | 北京市劳动保护科学研究所 | Composite sound absorption plate |
| JP2016177117A (en) * | 2015-03-20 | 2016-10-06 | 克己 櫂谷 | Thin plate-like sound absorbing structure and method of manufacturing the same |
| CN105118497A (en) * | 2015-09-18 | 2015-12-02 | 贵州大学 | Tube-bundle perforated panel and spring cyclic structure sound absorption apparatus |
| CN107437411A (en) * | 2016-05-27 | 2017-12-05 | 北京市劳动保护科学研究所 | A kind of low frequency composite sound absorbing device |
| CN206134247U (en) * | 2016-10-09 | 2017-04-26 | 四川中车复合材料结构有限公司 | Novel compound acoustic baffle of foamed aluminium |
| CN106652989A (en) * | 2017-01-18 | 2017-05-10 | 江苏大学 | Mechanical impedance plate composite porous elastic tube sound absorbing structure |
| CN206451511U (en) * | 2017-01-18 | 2017-08-29 | 江苏大学 | A kind of compound porous elastic tube sound absorption structure of mechanical impedance plate |
Non-Patent Citations (2)
| Title |
|---|
| GROBY J P: ""Enhancing the absorption properties of acoustic porous plates by periodically embedding Helmholtz resonators"", 《JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA》 * |
| 王世彦: ""弹性壁共振腔和声学覆盖层中低频吸声性能计算与分析"", 《第十六届船舶水下噪声学术讨论会论文集》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613481A (en) * | 2019-01-10 | 2019-04-12 | 重庆大学 | A kind of Wave beam forming identification of sound source method adapting to wind tunnel test environment |
| CN110397505A (en) * | 2019-07-11 | 2019-11-01 | 上海交通大学 | A kind of extension cast perforated plate honeycomb interlayer sound absorption structure |
| CN112447162A (en) * | 2019-08-29 | 2021-03-05 | 比亚迪股份有限公司 | Sound absorption structure design method, sound absorption structure and acoustic bag structure |
| CN112447162B (en) * | 2019-08-29 | 2024-07-16 | 比亚迪股份有限公司 | Sound absorption structure design method, sound absorption structure and acoustic package structure |
| CN111696511A (en) * | 2020-01-17 | 2020-09-22 | 南京大学 | Laying method for improving random incidence sound absorption performance of resonance sound absorber array |
| CN112227237A (en) * | 2020-11-10 | 2021-01-15 | 广州地铁设计研究院股份有限公司 | Sound barrier containing air resonant cavity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108922510B (en) | 2023-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108922510A (en) | The sound-absorbing porous material mixing sound absorption structure in parallel with resonant structure | |
| CN101727894B (en) | Composite sound absorbing device with built-in resonant cavity | |
| CN204898916U (en) | Multilayer double entry cavity wide band sound absorption device | |
| CN103700366B (en) | The broad band sound absorption structure that the mechanical impedance of combinative resonator is combined with microperforated panel | |
| CN210639980U (en) | Inhale sound insulation composite member and transformer | |
| US20120247867A1 (en) | Composite sound-absorbing device with built in resonant cavity | |
| CN203773937U (en) | Sound insulating and absorbing honeycomb panel | |
| CN102298925A (en) | Composite sound-absorbing structure | |
| CN104700827B (en) | Wideband sound absorbent perforated structure | |
| CN108399911B (en) | Ventilating, radiating and sound insulating structure of low-frequency broadband | |
| CN210489826U (en) | Low transmission loss radome | |
| CN112435647A (en) | Sound absorption unit and sound absorption device | |
| CN108443116B (en) | Suction muffler for refrigerator reciprocating compressor | |
| CN113096626A (en) | Silent box | |
| CN103600809A (en) | Vibration damping and noise reducing flexible sandwich plate for ship structure | |
| CN105587374A (en) | Resonant silencer | |
| CN110459393A (en) | A kind of sound absorption composite members and a kind of transformer | |
| CN204303341U (en) | A kind of porous compound sound-absorption structural | |
| CN107610688B (en) | Cavity tube composite sound insulation structure | |
| CN211923206U (en) | Ultra-wide band sound absorption brick | |
| CN110230597A (en) | Compressor shell and compressor | |
| CN113539223B (en) | Helmholtz sound absorption device | |
| JP4145278B2 (en) | Sound absorber | |
| CN113393826B (en) | Low-frequency broadband acoustic metamaterial composite sound absorption structure and preparation method | |
| CN209944712U (en) | Noise elimination piece, silencer and ventilation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |