CN111739503A - Petal-shaped inner insertion tube type Helmholtz resonance sound absorption structure - Google Patents
Petal-shaped inner insertion tube type Helmholtz resonance sound absorption structure Download PDFInfo
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- CN111739503A CN111739503A CN202010484707.XA CN202010484707A CN111739503A CN 111739503 A CN111739503 A CN 111739503A CN 202010484707 A CN202010484707 A CN 202010484707A CN 111739503 A CN111739503 A CN 111739503A
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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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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention provides a petal-shaped inner insertion tube type Helmholtz resonance sound absorption structure, wherein a cavity and the petal-shaped inner insertion tube are welded or glued to form a Helmholtz resonance cavity, and radial roughness is introduced on the inner wall of the inner insertion tube, so that the acoustic impedance characteristic of the structure is improved, the low-frequency sound absorption performance of the structure is improved, and the sound absorption bandwidth of the structure is widened. The cavity structure reduces the structure weight and ensures the structure bearing performance on the premise of realizing good low-frequency sound absorption performance.
Description
Technical Field
The invention relates to the field of underwater sound absorption, in particular to a petal-shaped inner insertion tube type Helmholtz resonance sound absorption structure.
Background
Helmholtz resonance cavity is a typical resonance sound absorption structure, and in the middle of practical application, utilizes microperforated panel and back of the body chamber structure Helmholtz resonance structure usually, absorbs the sound wave in the air through Helmholtz resonance to realize the damping in movie theater, meeting room, the car cabin and fall the design of making an uproar. However, for the micro-perforated plate structure, if the micro-perforated plate structure is to achieve efficient absorption of the sound waves in the lower frequency band, the thickness of the micro-perforated plate needs to be increased and the aperture of the micro-perforations needs to be reduced, which results in an increase in the mass and volume of the structure, and is not favorable for light-weight design and manufacturing. In addition, the hole type of the micro-perforation is generally a regular cylindrical hole, the internal damping of the micro-perforation is small, and the micro-perforation is not beneficial to increasing the sound absorption bandwidth and improving the low-frequency sound absorption performance.
Disclosure of Invention
The invention provides a petal-shaped inner insertion tube type Helmholtz resonance sound absorption structure for solving the problems of narrow bandwidth, poor low-frequency sound absorption performance, difficult processing and manufacturing, large size and poor light weight performance of the traditional air sound absorption structure.
The invention provides a petal-shaped inner insertion tube type Helmholtz resonance sound absorption structure which comprises a cavity and petal-shaped inner insertion tubes, wherein the cavity and the petal-shaped inner insertion tubes are connected through welding or cementing to form the petal-shaped inner insertion tube type Helmholtz resonance sound absorption structure.
According to the invention, the cavity and the petal-shaped inner insertion tube are welded or glued to form the Helmholtz resonant cavity, and the radial roughness is introduced on the inner wall of the inner insertion tube, so that the acoustic impedance characteristic of the structure is improved, the low-frequency sound absorption performance of the structure is improved, and the sound absorption bandwidth of the structure is widened. The cavity structure reduces the structure weight and ensures the structure bearing performance on the premise of realizing good low-frequency sound absorption performance.
Specifically, the cavity is made of hard materials such as structural steel, resin, wood or composite materials, a small hole is formed in the upper surface, the lower surface of the cavity is fixed on the surface of a wall body needing acoustic treatment, and the structure has good bearing performance due to the application of the structural steel.
Furthermore, the diameter of the cavity is 20-30 mm, the cavity is used as a Helmholtz resonant cavity, the sound capacity effect is achieved, and the peak sound absorption frequency of the structure can be controlled by adjusting the diameter of the cavity.
Furthermore, the height of the cavity is 30-50 mm, the height of the cavity determines the size of the resonant cavity, and the sound absorption frequency band of the structure can be adjusted by changing the height of the cavity.
Specifically, the petal-shaped inner insertion tubes are made of hard materials such as structural steel, resin, wood or composite materials and are connected with the openings in the cavity through welding or gluing, the cavity is communicated with the outside through the petal-shaped inner insertion tubes, and air flows into the cavity through the petal-shaped inner insertion tubes to form the Helmholtz resonant cavity.
Further, the average diameter of intubate in the petal shape is 3~5mm, and the diameter of intubate in the petal shape has decided the diameter of intraductal air column, can change the helmholtz resonance characteristic of structure through adjusting the intubate diameter in the petal shape to adjust the sound absorption performance of structure.
Furthermore, the relative roughness of the inner petal-shaped inserting tubes is 0.15-0.25, the diameter change amplitude of the air column in the tubes is determined by the relative roughness of the inner petal-shaped inserting tubes, the acoustic impedance of the structure can be regulated by regulating the relative roughness of the inner petal-shaped inserting tubes, and the regulation and control of the sound absorption performance of the structure are realized.
Furthermore, the spatial wave number of the petal-shaped inner insertion tubes is 4-8, the spatial wave number of the petal-shaped inner insertion tubes determines the diameter change condition of air columns in the tubes, and the acoustic impedance of the structure can be regulated by regulating the spatial wave number of the petal-shaped inner insertion tubes, so that the sound absorption performance of the structure can be regulated.
Furthermore, the length of the petal-shaped inner insertion tube is 25-40 mm, the height of the air column in the perforation is determined by the length of the petal-shaped inner insertion tube, and the resonance sound absorption characteristic of the structure is controlled.
The invention has the beneficial effects that:
1. has excellent low-frequency sound absorption performance. The sound absorption coefficient of the test piece at a certain frequency of 100-400 Hz can reach more than 0.99, and perfect sound absorption is realized. Compared with the traditional structure, the sound absorption coefficient of the sound absorption structure is moved by 18% -35% to the low frequency, and the peak value of the sound absorption coefficient is improved by 5%. And the structure thickness is only 1/36-1/33 of the corresponding perfect sound absorption wavelength, and the super-material is a deep sub-wavelength scale low-frequency perfect sound absorption super-material.
2. Has good bearing performance and light weight performance. The cavity is made of hard materials such as structural steel, and the structure has good pressure resistance and is a multifunctional structure with bearing and light weight.
3. With more adjustable parameters and variables. The cavity diameter, the cavity height, the diameter of the petal-shaped inner insertion tube, the relative roughness of the petal-shaped inner insertion tube, the space wave number of the petal-shaped inner insertion tube and the length of the petal-shaped inner insertion tube are adjustable parameters, and can be selected and adjusted reasonably according to specific use scenes, such as the requirement on bearing performance or the requirement on acoustic performance.
4. Simple structure and easy manufacture.
Drawings
Fig. 1 is a schematic view of a petal-shaped inner insertion tube type helmholtz resonance sound absorption structure according to the present invention, wherein (a) is a schematic view of a petal-shaped inner insertion tube type helmholtz resonance sound absorption structure, (b) is a cross-sectional view of a petal-shaped inner insertion tube type helmholtz resonance sound absorption structure, and (c) is a cross-sectional view of a petal-shaped inner insertion tube;
FIG. 2 is a schematic diagram of sound absorption coefficients within 100-400 Hz of three embodiments of the present invention.
Wherein: 1. a cavity; 2. a petal-shaped inner insertion tube.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
According to the petal-shaped inner insertion tube type Helmholtz resonance sound absorption structure, the cavity 1 and the petal-shaped inner insertion tube 2 are welded or glued to form the Helmholtz resonance cavity, radial roughness is introduced into the inner wall of the inner insertion tube 2, the acoustic impedance characteristic of the structure is improved, the low-frequency sound absorption performance of the structure is improved, and the sound absorption bandwidth of the structure is widened. Under the prerequisite of realizing good low frequency sound absorption performance, cavity 1 structure has alleviateed structure weight, has guaranteed structure bearing capacity, has solved traditional microperforated panel sound absorbing structure and has had the bandwidth of ubiquitous narrower, low frequency sound absorption performance not good, manufacturing difficulty, the size is great, the not good problem of lightweight performance.
Referring to fig. 1, the petal-shaped inner insertion tube type helmholtz resonance sound absorption structure of the present invention includes a cavity 1 and a petal-shaped inner insertion tube 2, and the cavity 1 and the petal-shaped inner insertion tube 2 are connected by welding or glue joint to form the petal-shaped inner insertion tube type helmholtz resonance sound absorption structure.
The cavity 1 is made of hard materials such as structural steel, resin, wood or composite materials, a small hole is formed in the upper surface, the lower surface of the cavity is fixed on the surface of a wall body needing acoustic treatment, the diameter of the cavity 1 is 20-30 mm, the cavity is cylindrical, cuboid, hexagonal prism or irregular, and the height of the cavity 1 is 30-50 mm.
The petal-shaped inner inserting tube 2 is made of structural steel, resin, wood or composite materials and other hard materials and is connected with an opening on a cavity through welding or gluing, the radial roughness of the inner wall of the petal-shaped inner inserting tube 2 is carved according to the function gamma = d x [0.5-cos (nx) ], wherein d is the average diameter of the petal-shaped inner inserting tube and is the relative roughness of the petal-shaped inner inserting tube, n is the space wave number of the petal-shaped inner inserting tube, x is a coordinate along the length direction of the petal-shaped inner inserting tube, the average diameter of the petal-shaped inner inserting tube 2 is 3-5 mm, the relative roughness of the petal-shaped inner inserting tube 2 is 0.15-0.25, the space wave number of the petal-shaped inner inserting tube 2 is 4-8, and the length of the petal-shaped inner inserting tube 2 is 25-40 mm.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The acoustic absorption performance of the acoustic absorption cavity is mainly determined by resonance cavity parameters, and specifically comprises the cavity diameter, the cavity height, the petal-shaped inner insertion tube diameter, the petal-shaped inner insertion tube relative roughness, the petal-shaped inner insertion tube space wave number and the petal-shaped inner insertion tube length. The bearing and light weight performance is mainly determined by the size of the cavity, including the diameter and height of the cavity. Because the structural parameters are adjustable parameters, the corresponding performance requirements of sound absorption, bearing and light weight can be realized through adjustment. The technical solution of the present invention is exemplarily illustrated by the following specific examples.
Materials for examples:
structural steel: it is characterized by a density of 7850kg/m3Young's modulus 200GPa, Poisson's ratio 0.2.
Air: it is characterized by a density of 1.29kg/m3Sound velocity 343m/s, dynamic viscosity coefficient 1.81 × 10-5Pa·s。
Structural dimensions and material selection of comparative examples:
comparative example
A roughness-free insert tube type Helmholtz resonance sound absorbing structure was selected as a comparative example, in which the cavity diameter was 20mm, the cavity height was 30mm, the insert tube diameter was 3mm, and the insert tube length was 25 mm.
Structural dimensions and material selection of the examples:
example 1
The diameter of the cavity is 20mm, the height of the cavity is 30mm, the diameter of the petal-shaped inner insertion tube is 3mm, the relative roughness of the petal-shaped inner insertion tube is 0.15, the space wave number of the petal-shaped inner insertion tube is 4, and the length of the petal-shaped inner insertion tube is 25 mm.
Example 2
The diameter of the cavity is 25mm, the height of the cavity is 40mm, the diameter of the petal-shaped inner insertion tube is 4mm, the relative roughness of the petal-shaped inner insertion tube is 0.2, the space wave number of the petal-shaped inner insertion tube is 6, and the length of the petal-shaped inner insertion tube is 30 mm.
Example 3
The diameter of the cavity is 30mm, the height of the cavity is 50mm, the diameter of the petal-shaped inner insertion tube is 5mm, the relative roughness of the petal-shaped inner insertion tube is 0.25, the space wave number of the petal-shaped inner insertion tube is 8, and the length of the petal-shaped inner insertion tube is 40 mm.
Referring to fig. 2, the helmholtz resonance phenomenon at low frequency can achieve high sound absorption in a certain frequency range. By introducing radial roughness into the inner wall of the inner insertion tube, the acoustic impedance characteristic of the structure is improved, and the acoustic resistance and the acoustic quality of the structure are enhanced, so that the low-frequency perfect sound absorption is realized.
Referring to fig. 2, the comparative example reached a peak sound absorption value at 315Hz, which was 0.94, and perfect sound absorption could not be achieved.
Example 1 has the same structural parameters as the comparative example, except that the inner wall of the inner insert tube of example 1 has a radial roughness that achieves perfect sound absorption at 316Hz with a peak sound absorption of 0.99. Compared with the comparative example, after the inner cannula introduces the radial roughness, the sound absorption peak position of the invention is almost unchanged, and the sound absorption peak size is improved by 0.05 (5%). The sound absorption performance of the structure is greatly improved compared to the comparative example, and the sound absorption coefficient curve of example 1 is higher overall than that of the comparative example. At the moment, the thickness of the structure is only 30mm, which is 1/36 of the corresponding perfect sound absorption wavelength, so that the structure is a deep sub-wavelength scale low-frequency perfect sound absorption metamaterial;
example 2 after further optimization of the structural parameters, perfect sound absorption was achieved at 258Hz with a peak sound absorption value of 0.99. Compared with the comparative example, the peak sound absorption of example 2 is shifted to a low frequency by 57Hz (18%), and the peak sound absorption is increased by 0.05 (5%). The sound absorption properties of the structure are greatly improved compared to the comparative examples. The thickness of the structure is only 40mm and is 1/33 of the corresponding perfect sound absorption wavelength, so that the structure is a deep sub-wavelength scale low-frequency perfect sound absorption metamaterial;
example 3 after further optimization of the structural parameters, perfect sound absorption was achieved at 204Hz with a peak sound absorption value of 0.99. The peak sound absorption of example 3 was shifted by 111Hz (35%) to a lower frequency and the peak sound absorption was increased by 0.05 (5%) compared to the comparative example. The sound absorption properties of the structure are greatly improved compared to the comparative examples. At the moment, the thickness of the structure is only 50mm, which is 1/34 of the corresponding perfect sound absorption wavelength, so that the structure is a deep sub-wavelength scale low-frequency perfect sound absorption metamaterial;
the sound absorption coefficient curve shows that the invention can realize excellent low-frequency sound absorption performance in a certain frequency range, and the adjustment of the acoustic performance can be realized through the design of different structural parameters.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. The utility model provides a petal shape intubate formula helmholtz resonance sound absorption structure which characterized in that: the cavity is connected with the petal-shaped inner insertion tubes through welding or cementing to form a petal-shaped inner insertion tube type Helmholtz resonance sound absorption structure; the upper surface of the cavity is provided with small holes, and the lower surface of the cavity is fixed on the surface of a wall body needing acoustic treatment; the petal-shaped inner inserting tube is connected with the small hole in the cavity through welding or cementing, the radial roughness of the inner wall of the petal-shaped inner inserting tube is described by a function of r = d x [0.5-sin (nx) ], wherein d is the average diameter of the petal-shaped inner inserting tube and is the relative roughness of the petal-shaped inner inserting tube, n is the space wave number of the petal-shaped inner inserting tube, and x is the coordinate along the length direction of the petal-shaped inner inserting tube.
2. A petal shaped inner bayonette type helmholtz resonance sound absorbing structure according to claim 1, wherein: the cavity is made of hard materials, including structural steel, resin, wood or composite materials.
3. A petal shaped inner bayonette type helmholtz resonance sound absorbing structure according to claim 1, wherein: the diameter of the cavity is 20-30 mm, and the shape of the cavity is cylindrical, cuboid, hexagonal prism or irregular.
4. A petal shaped inner bayonette type helmholtz resonance sound absorbing structure according to claim 1, wherein: the height of the cavity is 30-50 mm.
5. A petal shaped inner bayonette type helmholtz resonance sound absorbing structure according to claim 1, wherein: the petal-shaped inner insertion tubes are made of hard materials and comprise structural steel, resin, wood or composite materials.
6. A petal shaped inner bayonette type helmholtz resonance sound absorbing structure according to claim 1, wherein: the average diameter of the petal-shaped inner insertion tube is 3-5 mm.
7. A petal shaped inner bayonette type helmholtz resonance sound absorbing structure according to claim 1, wherein: the relative roughness of the petal-shaped inner insertion tube is 0.15-0.25 mm.
8. A petal shaped inner bayonette type helmholtz resonance sound absorbing structure according to claim 1, wherein: the space wave number of the petal-shaped inner insertion tube is 4-8.
9. A petal shaped inner bayonette type helmholtz resonance sound absorbing structure according to claim 1, wherein: the length of the petal-shaped inner insertion tube is 25-40 mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113362796A (en) * | 2021-05-10 | 2021-09-07 | 西安交通大学 | Two-way rough inner insertion tube type Helmholtz resonance sound absorption structure |
| CN113362795A (en) * | 2021-05-10 | 2021-09-07 | 西安交通大学 | Porous sound absorbing structure of petal-shaped channel |
| CN113362793A (en) * | 2021-05-10 | 2021-09-07 | 西安交通大学 | Porous sound absorbing structure with micro-channels arranged in bidirectional rough parallel manner |
| CN116189644A (en) * | 2023-04-28 | 2023-05-30 | 南京南大电子智慧型服务机器人研究院有限公司 | Broadband cylindrical acoustic wave absorber with sub-wavelength |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015212790A (en) * | 2014-05-07 | 2015-11-26 | 大成建設株式会社 | Sound absorber using helmholtz resonance |
| CN205692567U (en) * | 2016-05-27 | 2016-11-16 | 北京市劳动保护科学研究所 | A kind of low frequency composite sound absorbing device |
| CN106856090A (en) * | 2015-12-09 | 2017-06-16 | 北京市劳动保护科学研究所 | A kind of microperforated panel combination acoustic metamaterial compound sound-absorption structural |
| CN109346051A (en) * | 2018-12-13 | 2019-02-15 | 西安交通大学 | Built-in perforated-plate Helmholtz resonator and broad band low frequency sound absorption structure based on it |
| CN111105774A (en) * | 2019-10-29 | 2020-05-05 | 同济大学 | Helmholtz resonator and low-frequency broadband sound absorption and noise reduction structure based on same |
| US20200143782A1 (en) * | 2018-11-05 | 2020-05-07 | Yamaha Corporation | Sound Absorbing Apparatus and Sound Absorption Structure |
-
2020
- 2020-06-01 CN CN202010484707.XA patent/CN111739503B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015212790A (en) * | 2014-05-07 | 2015-11-26 | 大成建設株式会社 | Sound absorber using helmholtz resonance |
| CN106856090A (en) * | 2015-12-09 | 2017-06-16 | 北京市劳动保护科学研究所 | A kind of microperforated panel combination acoustic metamaterial compound sound-absorption structural |
| CN205692567U (en) * | 2016-05-27 | 2016-11-16 | 北京市劳动保护科学研究所 | A kind of low frequency composite sound absorbing device |
| US20200143782A1 (en) * | 2018-11-05 | 2020-05-07 | Yamaha Corporation | Sound Absorbing Apparatus and Sound Absorption Structure |
| CN109346051A (en) * | 2018-12-13 | 2019-02-15 | 西安交通大学 | Built-in perforated-plate Helmholtz resonator and broad band low frequency sound absorption structure based on it |
| CN111105774A (en) * | 2019-10-29 | 2020-05-05 | 同济大学 | Helmholtz resonator and low-frequency broadband sound absorption and noise reduction structure based on same |
Non-Patent Citations (1)
| Title |
|---|
| 黄思博 等: "基于内插管式赫姆霍兹结构的宽频耦合吸声体", 《声学技术》, pages 1 - 4 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113362796A (en) * | 2021-05-10 | 2021-09-07 | 西安交通大学 | Two-way rough inner insertion tube type Helmholtz resonance sound absorption structure |
| CN113362795A (en) * | 2021-05-10 | 2021-09-07 | 西安交通大学 | Porous sound absorbing structure of petal-shaped channel |
| CN113362793A (en) * | 2021-05-10 | 2021-09-07 | 西安交通大学 | Porous sound absorbing structure with micro-channels arranged in bidirectional rough parallel manner |
| CN113362793B (en) * | 2021-05-10 | 2024-05-24 | 西安交通大学 | Bidirectional rough parallel-arrangement micro-channel porous sound absorption structure |
| CN113362796B (en) * | 2021-05-10 | 2024-05-24 | 西安交通大学 | Bidirectional rough interpolation tube type Helmholtz resonance sound absorption structure |
| CN116189644A (en) * | 2023-04-28 | 2023-05-30 | 南京南大电子智慧型服务机器人研究院有限公司 | Broadband cylindrical acoustic wave absorber with sub-wavelength |
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