CN111696504A - Petal-shaped inner insertion tube type underwater Helmholtz resonance cavity structure - Google Patents
Petal-shaped inner insertion tube type underwater Helmholtz resonance cavity structure Download PDFInfo
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- CN111696504A CN111696504A CN202010485705.2A CN202010485705A CN111696504A CN 111696504 A CN111696504 A CN 111696504A CN 202010485705 A CN202010485705 A CN 202010485705A CN 111696504 A CN111696504 A CN 111696504A
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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
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Abstract
The invention discloses a petal-shaped inner insertion tube type underwater Helmholtz resonance cavity structure, wherein a damping inner lining layer is arranged on the inner wall of a cavity, a hole is formed in the center of one end of the cavity, petal-shaped inner insertion tubes are arranged in the hole, and the petal-shaped inner insertion tubes and the cavity are connected in a welding or gluing mode to form the petal-shaped inner insertion tube type underwater Helmholtz resonance cavity structure. The invention has excellent low-frequency sound absorption performance, good bearing performance and light weight performance. Have more adjustable structural parameters in the aspect of the design, can carry out corresponding regulation according to the operating condition demand, simple structure easily makes.
Description
Technical Field
The invention belongs to the technical field of underwater sound absorption, and particularly relates to a petal-shaped inner insertion tube type underwater Helmholtz resonance cavity structure.
Background
The acoustic metamaterial is an artificial periodic composite structure and has the extraordinary acoustic characteristics different from natural materials, such as acoustic focusing, negative refraction, unidirectional transmission, acoustic stealth and the like. In addition, the perfect absorption of low-frequency sound waves by the deep sub-wavelength scale structure is also one of the important special properties of the acoustic metamaterial. In aeroacoustics, perfect absorption based on the helmholtz resonance principle can be achieved by a structural design of space winding or hierarchical perforation. Some of these structures also exhibit broadband absorption capability through the parallel connection of multiple elements with different geometric parameters.
But in water acoustics, metamaterials relying on viscous energy dissipation of air would no longer be suitable due to the near incompressibility and relatively small viscosity of water. Furthermore, the wavelength of sound waves in water is 4 times or more that of air at the same frequency, which makes it more difficult to achieve complete absorption of low frequencies by a small-sized structure.
In the traditional underwater sound absorption material/structure, for example, materials/structures such as a sound absorption covering layer with periodically arranged cavities, a local resonance type phononic crystal, an impedance gradual change type sound absorption covering layer and the like, most of matrixes of the traditional underwater sound absorption material/structure are made of rubber or polyurethane, and the traditional underwater sound absorption material/structure needs to be adhered to a steel shell of underwater equipment during actual work, so that the structural weight is increased, the bearing performance is poor, and the traditional underwater sound absorption material/structure is easy to deform under the action of deep water load, so that the sound absorption performance is weakened. In summary, the above structure generally has the problems of narrow bandwidth, poor low-frequency sound absorption performance, difficulty in processing and manufacturing, large size and poor light weight performance.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a petal-shaped inner insertion tube type underwater helmholtz resonance cavity structure, which solves the problems of narrow bandwidth, poor low-frequency sound absorption performance, difficult processing and manufacturing, large size and poor light weight performance of the conventional underwater sound absorption structure.
The invention adopts the following technical scheme:
the utility model provides an interior intubate of petal shape is Helmholtz resonance cavity structure under water, includes the cavity, and the inner wall of cavity is provided with the damping inner liner, and the center department of cavity one end opens porosely, downtheholely is provided with interior intubate of petal shape, and interior intubate of petal shape and cavity welding or the mode of gluing are connected and are constituted the interior intubate of petal shape is Helmholtz resonance cavity structure under water.
Specifically, the radial roughness of the inner wall of the petal-shaped interpolation tube satisfies the function Γ relationship as follows:
Г＝d×[0.5-cos(βx)]
wherein d is the average diameter of the petal-shaped inner insertion tube and the relative roughness of the petal-shaped inner insertion tube, n is the space wave number of the petal-shaped inner insertion tube, and x is the coordinate along the length direction of the petal-shaped inner insertion tube.
Specifically, the average diameter of the petal-shaped inner insertion tube is 3-5 mm.
Specifically, the relative roughness of the petal-shaped inner insertion tube is 0.15-0.3.
Specifically, the space wave number of the petal-shaped inner insertion tube is 4-8.
Specifically, the length of the petal-shaped inner insertion tube is 25-40 mm.
Specifically, the cavity is cylindrical, rectangular, hexagonal prism or irregular.
Furthermore, the diameter of the cavity is 30-45 mm.
Further, the height of the cavity is 30-50 mm.
Specifically, the thickness of damping inside liner is 2 ~ 4 mm.
Compared with the prior art, the invention has at least the following beneficial effects:
the petal-shaped inner insertion tube type underwater Helmholtz resonance cavity structure comprises a cavity body, a petal-shaped inner insertion tube, a damping lining layer, a sound absorbing layer and a sound absorbing layer, wherein the cavity body is welded or glued with the petal-shaped inner insertion tube to form a Helmholtz resonance cavity, radial roughness is introduced to the inner wall of the inner insertion tube to improve the acoustic impedance characteristic of the structure, the damping lining layer is glued to the inner wall of the cavity body to provide extra sound capacity and sound resistance, the low-frequency sound absorbing performance of the structure is improved, the sound absorbing bandwidth of the structure is widened, the cavity body is made of hard materials such as structural steel, the upper surface of the cavity body is provided. The cavity structure reduces the structure weight on the premise of realizing good low-frequency sound absorption performance, ensures the structure bearing performance, and solves the problems that the traditional underwater sound absorption structure has narrow bandwidth, poor low-frequency sound absorption performance, difficult processing and manufacturing, large size and poor light weight performance.
Furthermore, the petal-shaped inner inserting tube is made of structural steel and other hard materials and is connected with the opening on the cavity through welding or cementing, the inner part of the cavity is communicated with the outside due to the petal-shaped inner inserting tube, water flows into the cavity through the petal-shaped inner inserting tube to form a Helmholtz resonant cavity, and radial roughness meeting a function is introduced into the inner wall of the inner inserting tube; on the other hand, the adjustable parameters of the structure are increased, so that the structure has more excellent performance adjustability.
Further, the average diameter of intubate in the petal shape is 3 ~ 5mm, and the diameter of intubate has decided the diameter of intraductal water column in the petal shape, 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 0.15-0.3, the diameter change amplitude of the water column in the tube 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 the water column in the tubes, and the acoustic impedance of the structure can be regulated and controlled 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 and controlled.
Furthermore, the length of the inner insertion tube in the petal shape is 25-40 mm, the height of a water column in the through hole is determined by the length of the inner insertion tube in the petal shape, and the resonance sound absorption characteristic of the structure is controlled.
Furthermore, the diameter of the cavity is 30-45 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.
Further, the damping inner liner is made by sticky elastic material such as rubber or polyurethane, paste on cavity inner wall, the pasting of damping inner liner provides extra acoustic resistance and sound capacity for helmholtz resonance chamber, the impedance characteristic of structure has been improved, be favorable to realizing the low frequency of structure sound absorption under water, damping inner liner thickness is 2 ~ 4mm, the thickness of damping inner liner has decided the size of the acoustic resistance and the sound capacity of extra increase, can exert an influence to the acoustic impedance characteristic of structure, can realize specific frequency's excellent sound absorption effect through rational design.
In conclusion, the sound-absorbing material has excellent low-frequency sound-absorbing performance, good bearing performance and light weight. Have more adjustable structural parameters in the aspect of the design, can carry out corresponding regulation according to the operating condition demand, simple structure easily makes.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of the present invention, wherein (a) is a perspective view, (b) is a sectional view, and (c) is a sectional view of a petal-shaped inner cannula;
FIG. 2 is a schematic diagram of sound absorption coefficients within 0-1000 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.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
The invention provides a petal-shaped inner insertion tube type underwater Helmholtz resonance cavity structure, wherein a Helmholtz resonance cavity is formed by welding or gluing a cavity and a petal-shaped inner insertion tube, radial roughness is introduced on the inner wall of the inner insertion tube, the acoustic impedance characteristic of the structure is improved, a damping lining layer is pasted on the inner wall of the cavity, extra acoustic capacity and acoustic resistance are provided, 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 on the premise of realizing good low-frequency sound absorption performance, ensures the structure bearing performance, and solves the problems that the traditional underwater sound absorption structure has narrow bandwidth, poor low-frequency sound absorption performance, difficult processing and manufacturing, large size and poor light weight performance.
Referring to fig. 1, the petal-shaped inner insertion tube type underwater helmholtz resonance cavity structure of the present invention includes a cavity 1, petal-shaped inner insertion tubes 2 and a damping liner layer 3, wherein the damping liner layer 3 is adhered to an inner wall of the cavity 1, the petal-shaped inner insertion tubes 2 are sleeved in the cavity 1, and are connected by welding or gluing to form the petal-shaped inner insertion tube type underwater helmholtz resonance cavity structure.
The cavity 1 is made of hard materials such as structural steel, a hole is formed in the upper surface of the cavity, the petal-shaped inner insertion tube 2 is arranged in the hole, the lower surface of the cavity is fixed on the surface of a structure needing acoustic treatment, the cavity 1 is cylindrical, cuboid, hexagonal prism or irregular, the diameter of the cavity is 30-45 mm, and the height of the cavity is 30-50 mm.
The petal-shaped inner inserting tube 2 is made of hard materials such as structural steel and the like, is connected with an opening on the cavity body through welding or cementing, and the radial roughness of the inner wall of the petal-shaped inner inserting tube 2 is characterized by a function gamma, and specifically comprises the following steps:
Г＝d×[0.5-cos(nx)]
wherein d is the average diameter of the petal-shaped inner insertion tube and the relative roughness of the petal-shaped inner insertion tube, n is the space wave number of the petal-shaped inner insertion tube, and x is the coordinate along the length direction of the petal-shaped inner insertion tube.
The average diameter of the petal-shaped inner insertion tube 2 is 3-5 mm, the relative roughness of the petal-shaped inner insertion tube 2 is 0.15-0.3, the space wave number of the petal-shaped inner insertion tube 2 is 4-8, and the length of the petal-shaped inner insertion tube 2 is 25-40 mm.
The damping inner liner layer 3 is made of sticky elastic materials such as rubber or polyurethane and is pasted on the inner wall of the cavity 1, and the thickness of the damping inner liner layer 3 is 2-4 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 device 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, the petal-shaped inner insertion tube length and the damping lining layer thickness. 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.
Water: it is characterized by a density of 1000kg/m3The sound velocity is 1500m/s, and the dynamic viscosity coefficient is 0.00101 pas.
Rubber: it is characterized by a density of 1100kg/m3Young's modulus 10MPa, Poisson's ratio 0.49, and loss factor 0.2.
Structural dimensions and material selection of comparative examples:
comparative example
An inner insertion tube type Helmholtz resonance sound absorption structure without roughness and damping inner lining layers is selected as a comparative example, wherein the diameter of a cavity is 30mm, the height of the cavity is 30mm, the diameter of the inner insertion tube is 3mm, and the length of the inner insertion tube is 25 mm.
Structural dimensions and material selection of the examples:
example 1
The diameter of the cavity is 30mm, 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, the length of the petal-shaped inner insertion tube is 25mm, and the thickness of the damping lining layer is 2 mm.
Example 2
The diameter of the cavity is 40mm, 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, the length of the petal-shaped inner insertion tube is 30mm, and the thickness of the damping lining layer is 3 mm.
Example 3
The diameter of the cavity is 45mm, 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 0.3, the space wave number of the petal-shaped inner insertion tube is 8, the length of the petal-shaped inner insertion tube is 40mm, and the thickness of the damping lining layer is 4 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 pipe and sticking a damping lining layer on the inner wall of the cavity, the acoustic impedance characteristic of the structure is improved, the acoustic resistance and the acoustic quality of the structure are enhanced, and the low-frequency perfect sound absorption is realized.
Referring to fig. 2, the comparative example reaches the sound absorption peak value at 882Hz, the peak value is 0.42, and effective sound absorption cannot be realized due to insufficient structural damping.
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 radial roughness, and a 2mm damping liner layer is adhered to the inner wall of the cavity, which can achieve perfect sound absorption at 380Hz with a sound absorption peak value of 0.99. Compared with a comparative example, after the radial roughness is introduced into the inner insertion pipe and the damping lining layer is pasted on the inner wall of the cavity, the sound absorption peak value of the sound absorption device is moved to the low frequency by 502Hz (57%), and the sound absorption peak value is improved by 0.58 (58%). 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 30mm, which is 1/132 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 284Hz with a peak sound absorption value of 0.99. Compared with the comparative example, the sound absorption peak of the example 2 is shifted to a low frequency by 598Hz (68%), and the sound absorption peak size is increased by 0.58 (58%). 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 1/132 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 229Hz with a peak sound absorption of 0.99. The peak sound absorption of example 3 was shifted toward lower frequencies by 653Hz (74%) and the peak sound absorption size was increased by 0.58 (58%) as 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 1/131 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.
In summary, the invention achieves the following technical effects:
1. has excellent low-frequency sound absorption performance. The sound absorption coefficient of the test piece at a certain frequency of 229-380 Hz can reach above 0.99, and perfect sound absorption is realized. Compared with the traditional structure, the sound absorption coefficient of the sound absorption structure is shifted to low frequency by 57% -74%, and the peak value of the sound absorption coefficient is improved by 58%. And the structure thickness is only 1/132-1/131 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, the length of the petal-shaped inner insertion tube and the thickness of the damping lining layer 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.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The underwater Helmholtz resonance cavity structure is characterized by comprising a cavity (1), wherein a damping inner lining layer (3) is arranged on the inner wall of the cavity (1), a hole is formed in the center of one end of the cavity (1), a petal-shaped inner inserting tube (2) is arranged in the hole, and the petal-shaped inner inserting tube (2) and the cavity (1) are connected in a welding or gluing mode to form the underwater Helmholtz resonance cavity structure.
2. A petal-shaped inner intubation type underwater helmholtz resonance cavity structure according to claim 1, wherein the radial roughness of the inner wall of the petal-shaped inner intubation (2) satisfies the function r relation as follows:
Г＝d×[0.5-cos(βx)]
wherein d is the average diameter of the petal-shaped inner insertion tube and the relative roughness of the petal-shaped inner insertion tube, n is the space wave number of the petal-shaped inner insertion tube, and x is the coordinate along the length direction of the petal-shaped inner insertion tube.
3. The underwater Helmholtz resonance chamber structure with petal-shaped inner insertion tubes as claimed in claim 1, wherein the average diameter of the petal-shaped inner insertion tubes (2) is 3-5 mm.
4. The underwater Helmholtz resonance chamber structure with petal-shaped inner insertion tubes as claimed in claim 1, wherein the relative roughness of the petal-shaped inner insertion tubes (2) is 0.15-0.3.
5. The underwater Helmholtz resonance chamber structure with petal-shaped inner tubes as claimed in claim 1, wherein the spatial wave number of the petal-shaped inner tubes (2) is 4-8.
6. The underwater Helmholtz resonance chamber structure with petal-shaped inner insertion tubes as claimed in claim 1, wherein the length of the petal-shaped inner insertion tubes (2) is 25-40 mm.
7. A petal-shaped inner cannula type underwater helmholtz resonance cavity structure according to claim 1, wherein the shape of the cavity (1) is cylindrical, rectangular parallelepiped, hexagonal prism or irregular.
8. A petal-shaped inner intubation type underwater Helmholtz resonance chamber structure according to claim 1 or 7, wherein the diameter of the chamber body (1) is 30-45 mm.
9. A petal-shaped inner intubation type underwater Helmholtz resonance chamber structure according to claim 1 or 7, wherein the height of the chamber body (1) is 30-50 mm.
10. The underwater Helmholtz resonance chamber structure with petal-shaped inner intubation according to claim 1, wherein the thickness of the damping lining layer (3) is 2-4 mm.
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| 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 |
| CN113823252A (en) * | 2021-08-26 | 2021-12-21 | 南京航空航天大学 | Petal-shaped channel-rubber composite underwater sound absorption structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN113823252A (en) * | 2021-08-26 | 2021-12-21 | 南京航空航天大学 | Petal-shaped channel-rubber composite underwater sound absorption structure |
| CN113823252B (en) * | 2021-08-26 | 2023-12-19 | 南京航空航天大学 | Petal-shaped channel-rubber composite underwater sound absorption structure |
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