CN112053672A - Viscoelastic material longitudinal baffle subregion sound absorbing structure under water - Google Patents
Viscoelastic material longitudinal baffle subregion sound absorbing structure under water Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 10
- 238000005192 partition Methods 0.000 claims abstract description 115
- 238000010521 absorption reaction Methods 0.000 claims abstract description 65
- 239000002131 composite material Substances 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
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- 239000003365 glass fiber Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
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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
- G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
-
- 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
Abstract
The invention discloses an underwater sound absorption structure partitioned by longitudinal partition plates made of viscoelastic materials. The invention has excellent mechanical property and good underwater sound absorption performance. The adjustable device has more adjustable parameters in the aspect of design, including structural parameters and material parameters, can be correspondingly adjusted according to the requirements of actual working conditions, and is simple in structure and easy to manufacture.
Description
Technical Field
The invention belongs to the technical field of underwater sound absorption composite structures, and particularly relates to an underwater sound absorption structure partitioned by longitudinal partition plates made of viscoelastic materials.
Background
Since the invention of sonar, underwater sound absorption materials and structures are hot spots and difficulties for research of scientists, and with further exploration of oceans, the problem becomes more urgent to be solved. The underwater sound absorption is usually made of a viscoelastic material, the viscoelastic material is made of high polymer materials such as rubber or polyurethane, molecular chains rub with each other under the excitation of sound waves to generate energy loss, and the loss capacity can be improved by filling glass beads or other fiber materials in the underwater sound absorption. Due to the strong penetrating ability of low-frequency sound waves, a thicker thickness is needed when the low-frequency sound waves are absorbed, or a resonance structure is introduced into the low-frequency sound waves, for example, an Alberich type sound absorption covering layer is introduced into a cavity, and the resonance of the cavity is utilized to improve the sound absorption performance of the low frequency. However, with the continuous development of sonar and the continuous increase of human detection depth, the materials cannot meet the requirements of human beings.
Therefore, the sound energy loss capability of the viscoelastic material is improved through the structural design, and the underwater sound absorption structure with the pressure bearing capability has important engineering application prospects.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a viscoelastic material longitudinal partition plate partitioned underwater sound absorption structure aiming at the defects in the prior art, and the problems that the traditional underwater sound absorption structure is not water pressure resistant and has poor broadband sound absorption performance are solved through reasonable design of the structure.
The invention adopts the following technical scheme:
the utility model provides a viscoelastic material longitudinal baffle subregion sound absorbing structure under water, includes the bottom plate, and vertical interval is provided with a plurality of baffles on the bottom plate, and one side of every baffle is provided with longitudinal baffle, constitutes a cell between two adjacent baffles, sets up viscoelastic material in every cell.
Specifically, the longitudinal partition plate is of an L-shaped structure, one end of a horizontal section of the L-shaped structure is connected with the upper end of the partition plate, and the other end of the horizontal section of the L-shaped structure is arranged in the viscoelastic material.
Specifically, the longitudinal partition plate is of an inverted T-shaped structure, the horizontal section of the inverted T-shaped structure is connected with the partition plate, and the vertical section is arranged in the viscoelastic material from top to bottom.
Furthermore, the length of the vertical section of the longitudinal partition plate is 0-40 mm, the length of the horizontal section of the longitudinal partition plate is half of the width of the cell, and the distance between the connecting surface of the inverted T-shaped structure and the partition plate and the upper surface is 0-40 mm.
Specifically, the width a of the unit cell is 10-40 mm.
Specifically, the thickness of the partition plate, the longitudinal partition plate and the bottom plate is 1-5 mm, and the height of the partition plate is the same as that of the viscoelastic material.
Furthermore, the partition boards, the longitudinal partition boards and the bottom board are made of metal materials or carbon fiber/glass fiber composite materials.
Specifically, the density of the viscoelastic material is 500-1000 kg/m3。
Specifically, the transverse wave sound velocity of the viscoelastic material is 800-1200 m/s, and the transverse wave loss factor is 0.01-0.2; the longitudinal wave sound velocity is 20-200 m/s, and the longitudinal wave loss factor is larger than 0.7.
Specifically, the overall thickness of the underwater sound absorption structure partitioned by the viscoelastic material longitudinal partition boards is 20-50 mm.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the underwater sound absorption structure partitioned by the longitudinal partition boards made of the viscoelastic materials, the partition boards are introduced into the viscoelastic materials and connected with the bottom, so that the partition boards cannot vibrate due to sound waves. The viscoelastic material vibrates under the excitation of sound waves, due to the existence of the partition plates, the vibration of the material close to the partition plates is restrained, and the vibration of the material far away from the partition plates is relatively severe, so that a strong shearing effect is generated in the viscoelastic material, the longitudinal partition plates are periodically arranged in the viscoelastic material and have different bending modes, and due to the fact that the shearing loss of the viscoelastic material is far greater than the compression loss, the sound wave loss capacity of the viscoelastic material can be greatly improved. On the other hand, the partition plate is connected with the bottom plate, so that the structure has certain bearing capacity, and the water pressure resistance of the structure is further improved.
Furthermore, in order to maximize the loss of sound waves in the viscoelastic material, better realize the absorption of the sound waves and improve the sound absorption performance of the structure, the shape of the partition plate is changed, the design idea of the space folding structure is utilized, the viscoelastic material is packaged through the longitudinally bent partition plate, the propagation direction of the sound waves is changed, and the effective thickness of the viscoelastic structure is increased.
Furthermore, the longitudinal partition plates are arranged in an inverted T-shaped structure, so that the effective thickness of the viscoelastic material is increased in different areas of the Philadelphia of the viscoelastic material.
Further, the longitudinal partition length dimension is related to the viscosity of the viscoelastic material, and the equivalent thickness of the viscoelastic material can be controlled.
Furthermore, the width of each cell is 10-40 m, the width of each cell is selected to be related to parameters of the viscoelastic material, and the width of each cell and the parameters of the viscoelastic material are matched with each other, so that good sound absorption performance is realized.
Furthermore, the thickness of the partition plate, the thickness of the longitudinal partition plate and the thickness of the bottom plate are 1-5 mm, and the rigidity of the partition plate can be guaranteed so that the partition plate does not vibrate along with the viscoelastic material.
Furthermore, in order to ensure acoustic impedance mismatch between the partition board and the viscoelastic material and have certain bearing capacity, the partition board is selected from metal such as steel and aluminum or composite materials such as carbon fiber and glass fiber.
Furthermore, the damping material is a polyurethane viscoelastic material, and plays a main sound absorption role in the structure, and the shear wave loss factor is 0.6 or more, so as to ensure that the damping material has enough loss capacity for sound wave energy.
Furthermore, in order to ensure that the structure has enough sound absorption capacity, the total thickness of the underwater sound absorption structure partitioned by the viscoelastic material longitudinal partition boards is 20-50 mm.
In conclusion, the invention has excellent mechanical property and good underwater sound absorption performance. The adjustable device has more adjustable parameters in the aspect of design, including structural parameters and material parameters, can be correspondingly adjusted according to the requirements of actual working conditions, and is simple in structure and easy to manufacture.
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 longitudinal partition structure and (b) is another longitudinal partition structure.
FIG. 2 is a two-dimensional schematic diagram of several comparative structural unit cells, wherein (a) is a uniform-thickness viscoelastic material, (b) is a viscoelastic material with fixed cell walls, (c) is a viscoelastic material with longitudinal partition walls, and (d) is a viscoelastic material divided into two parts by placing the joint between the longitudinal partition walls and the wall surfaces between the viscoelastic materials and changing the position of the joint;
FIG. 3 is a graph comparing the sound absorption coefficient curves for a sound absorbing structure of the present invention and a uniform thickness viscoelastic material.
Wherein: 1. a partition plate; 2. a viscoelastic material; 3. a longitudinal partition; 4. a base plate.
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 an underwater sound absorption structure of a longitudinal partition board partition of a viscoelastic material. The formed new structure not only has good mechanical property, but also the longitudinal partition plate has great promotion effect on the sound absorption performance of the viscoelastic material. Good sound absorption in different frequency ranges can be achieved by changing the shape of the longitudinal partitions. Thereby realized a kind of bearing, had the sound absorbing structure under water of wide band sound absorption effect again.
Referring to fig. 1, the underwater sound absorption structure partitioned by the longitudinal partition plates made of the viscoelastic materials comprises partition plates 1, viscoelastic materials 2, longitudinal partition plates 3 and a bottom plate 4, wherein the partition plates 1 are vertically arranged on the bottom plate 4 at intervals, each partition plate 1 is provided with the longitudinal partition plate 3, a cell is formed between every two adjacent partition plates 1, each cell is internally provided with the viscoelastic materials 2 to form the underwater sound absorption structure partitioned by the longitudinal partition plates made of the viscoelastic materials, the partition plates 1, the longitudinal partition plates 3 and the bottom plate 4 play a bearing role and improve the sound absorption performance of the viscoelastic materials, and the viscoelastic materials 2 are used as sound absorption materials to absorb sound wave energy.
The longitudinal partition plate 3 is of an L-shaped structure or an inverted T-shaped structure, one end of the horizontal section of the L-shaped structure is connected with the upper end of the partition plate 1, the other end of the horizontal section of the L-shaped structure is arranged in the viscoelastic material 2, the horizontal section of the inverted T-shaped structure is connected with the partition plate 1, and the vertical section of the horizontal section of the inverted T-shaped structure is arranged in the viscoelastic material 2 from top to bottom.
The vertical section length of the longitudinal partition plate 3 is 3-40 mm, the horizontal section length is 0-20 mm and does not exceed the width of the cell, and the distance between the connecting surface of the inverted T-shaped structure and the partition plate 1 and the upper surface is 0-40 mm.
The width a of the unit cell is 10-40 mm.
The partition board 1, the longitudinal partition board 3 and the bottom board 4 are made of metal materials such as iron and aluminum or carbon fiber/glass fiber composite materials, in order to meet the requirements of certain bearing capacity, weight and the like, the thicknesses of the partition board 1, the longitudinal partition board 3 and the bottom board 4 are 1-5 mm, and the height of the partition board 1 is consistent with that of a viscoelastic material.
The viscoelastic material 2 has a density of 500 to 1000kg/m3(ii) a The transverse wave sound velocity is 800-1200 m/s, and the transverse wave loss factor is 0.01-0.2; the longitudinal wave sound velocity is 20-200 m/s, and the longitudinal wave loss factor is larger than 0.7.
The overall thickness of the underwater sound absorption structure partitioned by the viscoelastic material longitudinal partition boards is 20-50 mm.
The underwater sound absorption structure with the longitudinal partition plate made of the viscoelastic material can achieve a good sound absorption effect between 2 and 20kHz, and compared with the viscoelastic material with the same thickness, the sound absorption performance is greatly improved. The reason is to consider an ideal connection between the separator and the viscoelastic material, i.e. no relative displacement between the two materials. When sound waves are transmitted to the surface of the structure, the partition board is connected with the bottom board and does not move, so that the viscoelastic material vibrates in vibration to cause a large shearing effect in the viscoelastic material, and the sound wave energy is lost. When the partition board is made into the shape of fig. 1(a), the equivalent thickness is greatly improved because the bottom is not connected, and the sound absorption performance is further improved. In the diaphragm of fig. 1(b), the viscoelastic material is divided into two parts having different equivalent thicknesses on the basis of the first part, and the two parts absorb sound waves in different frequency ranges. In addition, the structure also meets the requirement of maintaining the sound absorption performance under high hydrostatic pressure without reduction; simple structure, maneuverability are strong.
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.
Example 1
Materials for examples:
metal steel: it is characterized by a density of 7850kg/m3Young's modulus 205GPa, Poisson's ratio 0.28.
Viscoelastic material: it is characterized by a density of 800kg/m3The longitudinal wave velocity is 1000m/s, the longitudinal wave loss factor is 0.09, the transverse wave velocity is 100m/s, and the transverse wave loss factor is 0.9.
Water: it is characterized by a density of 1000kg/m3The speed of sound is 1500 m/s.
Structural dimensions of examples and comparative examples:
referring to fig. 2, wherein (a) is a comparative example of uniform viscoelastic material with equal thickness, (b) is a comparative example of viscoelastic material with fixed cell walls, and (c) and (d) are two longitudinal partition underwater sound absorption structures of viscoelastic material proposed by the present invention. In order to ensure the objectivity of the control, the thickness h of the example is kept consistent with that of the comparative example, i.e., h is 50mm, and the width a of the unit cell is 20 mm. The thickness t of the partition board is 1mm, and the insertion depth of the longitudinal partition board is h1The distance between the longitudinal partition plate and the wall surface is 33mm, and the distance between the longitudinal partition plate and the wall surface is 10 mm. For the second embodiment, the longitudinal partition is at a distance h from the upper surface at the connection surface with the wall surface2＝15mm。
Example 2
Materials for examples:
metal steel: it is characterized by a density of 7850kg/m3Young's modulus 205GPa, Poisson's ratio 0.28.
Viscoelastic material: it is characterized by a density of 900kg/m3The longitudinal wave velocity is 1200m/s, the longitudinal wave loss factor is 0.2, the transverse wave velocity is 100m/s, and the transverse wave loss factor is 0.9.
Water: it is characterized by a density of 1000kg/m3The speed of sound is 1500 m/s.
Structural dimensions of examples and comparative examples:
referring to fig. 2, wherein (a) is a comparative example of uniform viscoelastic material with equal thickness, (b) is a comparative example of viscoelastic material with fixed cell walls, and (c) and (d) are two longitudinal partition underwater sound absorption structures of viscoelastic material proposed by the present invention. In order to ensure the objectivity of the control, the thickness h of the example is kept consistent with that of the comparative example, namely h is 40mm, and the width a of the unit cell is 20 mm. The thickness t of the partition board is 1mm, and the insertion depth of the longitudinal partition board is h126.7mm, and the distance b between the longitudinal partition board and the wall surface is 20 mm. For the second embodiment, the longitudinal partition is at a distance h from the upper surface at the connection surface with the wall surface2＝20mm。
Example 3
Materials for examples:
metal steel: it is characterized by a density of 7850kg/m3Young's modulus 205GPa, Poisson's ratio 0.28.
Viscoelastic material: it is characterized by a density of 900kg/m3The longitudinal wave velocity is 800m/s, the longitudinal wave loss factor is 0.2, the transverse wave velocity is 100m/s, and the transverse wave loss factor is 0.9.
Water: it is characterized by a density of 1000kg/m3The speed of sound is 1500 m/s.
Structural dimensions of examples and comparative examples:
referring to fig. 2, wherein (a) is a comparative example of uniform viscoelastic material with equal thickness, (b) is a comparative example of viscoelastic material with fixed cell walls, and (c) and (d) are two longitudinal partition underwater sound absorption structures of viscoelastic material proposed by the present invention. In order to ensure the objectivity of the control, the thickness h of the example is kept consistent with that of the comparative example, namely h is 30mm, and the width a of the unit cell is 15 mm. The thickness t of the partition board is 1mm, and the insertion depth of the longitudinal partition board is h1The distance b between the longitudinal partition board and the wall surface is 7.5mm which is 20 mm. For the second embodiment, the longitudinal partition is at a distance h from the upper surface at the connection surface with the wall surface2＝15mm。
Numerical simulations using the above materials and structural dimensions give the following sound absorption coefficient comparisons for the examples and comparative examples:
the sound absorption coefficients of four structures between 0 and 10000Hz are calculated, and refer to fig. 3, wherein a black solid line represents the sound absorption coefficient of the viscoelastic material with uniform thickness, a dashed line represents the sound absorption coefficient with fixed cell wall surfaces, and a dotted line represent the sound absorption coefficients of the underwater sound absorption structure partitioned by the longitudinal partition plates of the two viscoelastic materials respectively. The sound absorption coefficient of the new structure reaches over 0.5 when over 1000 Hz. And when the connecting position of the longitudinal partition plate and the wall surface is changed, the positions of the sound absorption peaks are moved due to the fact that the equivalent thicknesses of the two parts are changed. The sound absorption performance of the invention can be adjusted by adjusting the position of the joint, the sound absorption coefficient results of the embodiments 2 and 3 are shown in fig. 3(b) and (c), and the underwater sound absorption performance of the viscoelastic material can be greatly improved by the mutual matching between the partition board and the viscoelastic material in the parameter value range. According to the data, the technical effects achieved by the invention are as follows:
1. the simulation calculation result of the invention has the sound absorption coefficient of more than 0.5 between 1kHz and 100kHz, the average sound absorption coefficient of more than 0.8, and the requirement of sound absorption in a certain frequency band is met;
2. the structure is simple, and the processing is convenient;
3. the mechanical property and the acoustic property of the structure can be changed by changing the parameters such as the material, the thickness and the like of the partition plate, so that the requirements of different occasions are met.
In conclusion, the viscoelastic material longitudinal partition plate partitioned underwater sound absorption structure can be used for manufacturing underwater non-pressure-resistant structures or some bearing structures, and has a wide engineering application prospect.
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 utility model provides a longitudinal baffle subregion of viscoelastic material sound absorbing structure under water which characterized in that, includes bottom plate (4), is provided with a plurality of baffles (1) on bottom plate (4) vertical interval, and one side of every baffle (1) is provided with longitudinal baffle (3), constitutes a cell between two adjacent baffles (1), sets up viscoelastic material (2) in every cell.
2. The underwater sound absorption structure with partitions made of viscoelastic materials and provided with the longitudinal partition boards as claimed in claim 1 is characterized in that the longitudinal partition boards (3) are of L-shaped structures, one end of the horizontal section of each L-shaped structure is connected with the upper end of each partition board (1), and the other ends of the horizontal sections of the L-shaped structures are arranged in the viscoelastic materials (2).
3. The underwater sound absorption structure with partitions made of viscoelastic materials and provided with the longitudinal partition boards as claimed in claim 1, wherein the longitudinal partition boards (3) are of an inverted T-shaped structure, the horizontal section of the inverted T-shaped structure is connected with the partition boards (1), and the vertical section of the inverted T-shaped structure is arranged in the viscoelastic materials (2) from top to bottom.
4. The underwater sound absorption structure of the longitudinal partition board partition of the viscoelastic material as claimed in claim 2 or 3, wherein the vertical section of the longitudinal partition board (3) has a length of 0-40 mm, the horizontal section has a length of half the cell width, and the distance from the connecting surface of the inverted T-shaped structure and the partition board (1) to the upper surface is 0-40 mm.
5. The underwater sound absorption structure partitioned by the longitudinal partition plates made of viscoelastic materials according to claim 1, wherein the width of each cell is 10-40 mm.
6. The underwater sound absorption structure with the partition areas made of the viscoelastic materials as the claim 1 is characterized in that the thicknesses of the partition boards (1), the longitudinal partition boards (3) and the bottom board (4) are 1-5 mm, and the height of the partition boards (1) is the same as that of the viscoelastic materials (2).
7. The underwater sound absorption structure with partitions made of viscoelastic materials and having longitudinal partitions as claimed in claim 6, wherein the partitions (1), the longitudinal partitions (3) and the bottom plate (4) are made of metal material or carbon fiber/glass fiber composite material.
8. The underwater sound absorption structure with partitioned viscoelastic material longitudinal partition boards as claimed in claim 1, wherein the viscoelastic material (2) has a density of 500-1000 kg/m3。
9. The underwater sound absorption structure of the longitudinal partition of the viscoelastic material as claimed in claim 1, wherein the sound velocity of the transverse wave of the viscoelastic material (2) is 800 to 1200m/s, and the loss factor of the transverse wave is 0.01 to 0.2; the longitudinal wave sound velocity is 20-200 m/s, and the longitudinal wave loss factor is larger than 0.7.
10. The underwater sound absorption structure with the partitions made of the viscoelastic materials as claimed in claim 1, wherein the overall thickness of the underwater sound absorption structure with the partitions made of the viscoelastic materials is 20-50 mm.
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| US4243117A (en) * | 1978-10-27 | 1981-01-06 | Lord Corporation | Sound absorbing structure |
| KR101626093B1 (en) * | 2015-05-18 | 2016-05-31 | 서울대학교산학협력단 | Acoustic absorbent comprising rigid wall repeatedly disposed |
| EP3043346A1 (en) * | 2015-01-12 | 2016-07-13 | Basf Se | Sound-damping or sound absorbing composite material |
| US20190035374A1 (en) * | 2017-07-31 | 2019-01-31 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Elastic material for coupling time-varying vibro-acoustic fields propagating through a medium |
| CN110211559A (en) * | 2019-06-20 | 2019-09-06 | 西安交通大学 | A kind of pyramid lattice scattering body is mingled with type underwater sound absorption structure |
| CN110310617A (en) * | 2019-06-20 | 2019-10-08 | 西安交通大学 | A kind of enhancing of right cylinder type dot matrix is mingled with type underwater sound absorption structure |
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2020
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