CN111739502A - Underwater sound absorption metamaterial with damping lining hexagonal honeycomb perforated plate - Google Patents
Underwater sound absorption metamaterial with damping lining hexagonal honeycomb perforated plate Download PDFInfo
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- CN111739502A CN111739502A CN202010485176.6A CN202010485176A CN111739502A CN 111739502 A CN111739502 A CN 111739502A CN 202010485176 A CN202010485176 A CN 202010485176A CN 111739502 A CN111739502 A CN 111739502A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a general shape other than plane
- B32B1/08—Tubular products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/06—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of natural rubber or synthetic rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/095—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/546—Flexural strength; Flexion stiffness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/718—Weight, e.g. weight per square meter
Abstract
The invention provides a damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial, which is characterized in that an upper panel, a honeycomb layer core and a lower panel are perforated by welding or gluing to form a plurality of honeycomb resonant cavity units, and damping lining layers are adhered to the side walls and the bottom surfaces of the honeycomb resonant cavity units, so that the acoustic impedance characteristic of a structure is improved, and the low-frequency sound absorption performance of the structure is improved. On the premise of realizing good low-frequency underwater sound absorption performance, the light honeycomb sandwich plate structure reduces the structure weight, ensures the structure bearing performance, and solves the problems of poor low-frequency sound absorption performance, heavier mass and poor bearing performance of the traditional underwater sound absorption structure.
Description
Technical Field
The invention relates to the field of underwater sound absorption, in particular to an underwater sound absorption metamaterial with a damping lining hexagonal honeycomb perforated plate.
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 poor low-frequency sound absorption performance, heavier mass and poor bearing performance.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides an underwater sound absorption metamaterial with a damping lining hexagonal honeycomb perforated plate, and solves the problems of poor low-frequency sound absorption performance, heavier mass and poor bearing performance of the traditional underwater sound absorption structure.
The invention adopts the following technical scheme:
the utility model provides a super material of sound absorption under water of hexagonal honeycomb perforated plate of damping inside lining, includes perforation upper panel, honeycomb layer core, damping inner liner and lower panel, and perforation upper panel, honeycomb layer core, lower panel link to each other through welding or gluing, and the damping inner liner is pasted on the lateral wall and the bottom surface of each honeycomb resonant cavity unit, forms a super material of sound absorption under water of hexagonal honeycomb perforated plate of damping inside lining.
According to the underwater sound absorption metamaterial with the damping lining hexagonal honeycomb perforated plate, the upper panel, the honeycomb layer core and the lower panel are perforated through welding or gluing to form the plurality of honeycomb resonant cavity units, and the damping lining layers are adhered to the side walls and the bottom surfaces of the honeycomb resonant cavity units, so that the acoustic impedance characteristic of the structure is improved, and the low-frequency sound absorption performance of the structure is improved. The light honeycomb sandwich plate structure reduces the structure weight and ensures the structure bearing performance on the premise of realizing good low-frequency underwater sound absorption performance.
Furthermore, the perforated upper panel is made of structural steel, small holes are periodically formed in the perforated upper panel, and the application of the structural steel enables the structure to have good bearing performance.
Furthermore, each small hole on the perforated upper panel corresponds to one honeycomb resonant cavity unit in the honeycomb layer core structure, the arrangement of the perforations enables the inside of each honeycomb unit to be communicated with the outside, and water flows into the inside of each honeycomb unit through the perforations to form a Helmholtz resonant cavity.
Further, the diameter of perforation is 2~4mm, and the shape is circular, triangle-shaped, square, petal shape or irregular shape, and the diameter of perforation interior water column has been decided to the diameter of perforation, can change the helmholtz resonance characteristic of structure through adjusting the perforation diameter to adjust the sound absorption performance of structure.
Furthermore, the thickness of the upper panel of the through hole is 2-5 mm, and the thickness of the upper panel determines the height of a water column in the through hole on one hand, controls the resonance sound absorption characteristic of the structure, and can adjust the bearing performance of the structure on the other hand.
Specifically, honeycomb layer core is made by the structural steel, and the shape is square honeycomb, circular honeycomb, triangle-shaped honeycomb, hexagonal honeycomb or the mixed honeycomb of many shapes of many sizes, and honeycomb layer core is used for bearing compressive load, and in addition, honeycomb wall divides the structure into a plurality of units, can realize the differentiation size design of different units, forms a plurality of resonant frequency, increases the sound absorption bandwidth of structure.
Further, the length is 25~40mm in the honeycomb, and the honeycomb cavity has played the effect of sound volume as helmholtz resonance chamber, through the length in the adjustment honeycomb, can control the peak value sound absorption frequency of structure.
Furthermore, the thickness of the honeycomb layer core is 30 mm-50 mm, the size of the resonance cavity is determined by the thickness of the honeycomb layer core, and the sound absorption frequency band of the structure can be adjusted by changing the thickness of the honeycomb layer core.
Specifically, the damping inner liner layer is made of sticky elastic materials such as rubber or polyurethane and is pasted on the side wall and the bottom surface of each honeycomb resonant cavity unit, and the pasting of the damping inner liner layer provides extra acoustic resistance and acoustic capacity for the honeycomb resonant cavity, improves the impedance characteristic of the structure, and is favorable for realizing the low-frequency underwater sound absorption of the structure.
Furthermore, the thickness of the damping lining layer is 1 mm-4 mm, the thickness of the damping lining layer determines the size of extra increased acoustic resistance and acoustic capacitance, the acoustic impedance characteristic of the structure can be influenced, and the excellent sound absorption effect of specific frequency can be realized through reasonable design.
The invention has the beneficial effects that:
1. has excellent low-frequency sound absorption performance. The sound absorption coefficient of the test piece can reach more than 0.5 within a certain range of 0-1000 Hz, and the half sound absorption bandwidth can reach more than 50%. The sound absorption peak value of partial position can reach more than 0.99, realized perfect sound absorption, the thickness is 1/102~1/62 of corresponding perfect sound absorption wavelength only, is a dark subwavelength underwater sound absorption structure.
2. Has good bearing performance and light weight performance. The perforated upper panel, the honeycomb core and the lower panel of the honeycomb sandwich structure jointly form a light honeycomb sandwich plate structure, and the structure has good pressure resistance and bending resistance and is a multifunctional structure with bearing and light weight.
3. With more adjustable parameters and variables. The diameter of the through hole, the thickness of the upper panel of the through hole, the height of the honeycomb layer core, the inner side length of the honeycomb, the thickness of the damping lining layer and the like are adjustable parameters, and can be reasonably selected and adjusted according to specific use scenes, such as the requirement on the bearing performance or the requirement on the acoustic performance.
4. Simple structure and easy manufacture.
Drawings
FIG. 1 is a schematic structural diagram of an underwater sound absorption structure of the present invention, wherein (a) is a schematic structural diagram of an underwater sound absorption metamaterial with a damping lining hexagonal honeycomb perforated plate, and (b) is a schematic structural diagram of a honeycomb resonant cavity unit;
FIG. 2 is a schematic diagram of sound absorption coefficients within 0-1000 Hz of three embodiments of the present invention.
Wherein: 1. perforating the upper panel; 2. a honeycomb layer core; 3. a damping liner layer; 4. a lower panel.
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.
The invention provides an underwater sound absorption metamaterial of a damping lining hexagonal honeycomb perforated plate, which is characterized in that an upper panel 1, a honeycomb layer core 2 and a lower panel 4 are perforated by welding or gluing to form a plurality of honeycomb resonant cavity units, and damping lining layers 3 are adhered to the side walls and the bottom surfaces of the honeycomb resonant cavity units, so that the acoustic impedance characteristic of a structure is improved, and the low-frequency sound absorption performance of the structure is improved. On the premise of realizing good low-frequency underwater sound absorption performance, the light honeycomb sandwich plate structure reduces the structure weight, ensures the structure bearing performance, and solves the problems of poor low-frequency sound absorption performance, heavier mass and poor bearing performance of the traditional underwater sound absorption structure.
Referring to fig. 1(a) and 1(b), the invention relates to a damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial, which comprises: the damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial comprises a perforated upper panel 1, a honeycomb layer core 2, a damping lining layer 3 and a lower panel 4, wherein the perforated upper panel 1, the honeycomb layer core 2 and the lower panel 4 are connected through welding or gluing, the damping lining layer 3 is pasted on the side wall and the bottom surface of each honeycomb resonant cavity unit, and the damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial is formed, and the structural schematic diagram is shown in figure 1.
The perforated upper panel 1 is made of structural steel, small holes are periodically formed in the perforated upper panel, each small hole in the perforated upper panel 1 corresponds to one honeycomb resonant cavity unit in the honeycomb layer core structure, the diameter of each perforation is 2-4 mm, and the thickness of the perforated upper panel 1 is 2-5 mm. In addition, the shape of the small holes on the perforated upper panel 1 is not limited to circular, triangular, square, petal-shaped or irregular.
Honeycomb layer core 2 is made by the structural steel, and the length is 25~40mm in the honeycomb, and honeycomb layer core 2's thickness is 30mm ~50 mm. In addition to this, the shape of the honeycomb layer core 2 is not limited to the hexagonal honeycomb, but may be circular honeycomb, triangular honeycomb, square honeycomb, or multi-size multi-shape hybrid honeycomb.
And the damping lining layer 3 is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit, and the thickness of the damping lining layer 3 is 1 mm-4 mm. In addition, the material of the damping liner layer 3 is not limited to rubber, and viscoelastic materials such as polyurethane may be used.
The lower panel 4 is made of structural steel and the lower surface 4 is fixed to the underwater equipment to be acoustically treated.
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 sound absorption performance of the invention is mainly determined by a honeycomb resonant cavity, and the sound absorption performance of the invention is determined by the diameter of a perforation, the thickness of a perforated upper panel, the height of a honeycomb core, the inner side length of a honeycomb and the thickness of a damping lining layer. The bearing and light weight performance is mainly determined by the panel and the honeycomb layer core, including the thickness of the panel on the perforation, the height of the honeycomb layer core, the inner length of the honeycomb and the like. 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 and Poisson's ratio 0.3.
Rubber: it is characterized by a density of 1100kg/m3Young's modulus 10MPa, Poisson's ratio 0.49, and equivalent isotropic loss factor 0.3.
Water: it is characterized by a density of 1000kg/m3The sound velocity is 1500m/s, and the dynamic viscosity coefficient is 0.00101 pas.
Structural dimensions and material selection of the examples:
example 1
The perforated upper panel is 5mm in thickness, the perforated diameter is 2mm, the honeycomb inner side length is 25mm, the honeycomb layer core is 50mm in height, and the damping layer lining is 4mm in thickness.
Example 2
The perforated upper panel is 4mm in thickness, the perforated diameter is 3mm, the honeycomb inner side length is 30mm, the honeycomb layer core height is 40mm, and the damping inner liner layer is 2mm in thickness.
Example 3
The perforated upper panel is 2mm in thickness, the perforated diameter is 4mm, the honeycomb inner side length is 40mm, the honeycomb layer core is 30mm in height, and the damping lining layer is 1mm in thickness.
Referring to fig. 2, the helmholtz resonance phenomenon at low frequencies can achieve perfect sound absorption in a certain frequency range. The damping lining layer is adhered to the inner wall of the honeycomb resonant cavity, so that the acoustic impedance characteristic of the structure is improved, the rubber layer provides extra acoustic resistance and acoustic capacity, and Helmholtz-like resonance is formed, so that underwater low-frequency perfect sound absorption is realized.
Referring to fig. 2, in example 1, the sound absorption coefficient at 189 to 328Hz is greater than 0.5, the half sound absorption bandwidth is 54%, perfect sound absorption is achieved at 257Hz, the peak value of the sound absorption coefficient is 0.99, perfect absorption of low-frequency sound waves is achieved, and the structure thickness is only 55mm and is 1/106 of the corresponding perfect sound absorption wavelength;
in the embodiment 2, the sound absorption coefficient at 365-582 Hz is greater than 0.5, the half sound absorption bandwidth is 46%, perfect sound absorption is achieved at 473Hz, the peak value of the sound absorption coefficient is 0.99, perfect absorption of low-frequency sound waves is achieved, and the structure thickness is only 44mm and is 1/72 of the corresponding perfect sound absorption wavelength;
in the embodiment 3, the sound absorption coefficient at 626-884 Hz is greater than 0.5, the half sound absorption bandwidth is 34%, perfect sound absorption is achieved at 755Hz, the peak value of the sound absorption coefficient is 0.99, perfect absorption of low-frequency sound waves is realized, and the structure thickness is only 32mm and is 1/62 of the corresponding perfect sound absorption wavelength;
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 super material of sound absorption under water of hexagonal honeycomb perforated plate of damping inside lining which characterized in that: the acoustic treatment device comprises a perforated upper panel, a honeycomb layer core, a damping lining layer and a lower panel, wherein the perforated upper panel, the honeycomb layer core and the lower panel are connected through welding or gluing, and the lower surface of the lower panel is fixed on underwater equipment needing acoustic treatment, wherein the honeycomb layer core comprises a plurality of honeycomb resonant cavity units; small holes are periodically formed in the perforated upper panel, and each small hole corresponds to one honeycomb resonant cavity unit in the honeycomb layer core structure; the damping lining layer is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit to form the damping lining hexagonal honeycomb perforated plate underwater sound absorption metamaterial.
2. The underwater sound absorption metamaterial with the damping lining hexagonal honeycomb perforated plate as claimed in claim 1, wherein: the perforated upper panel is made of structural steel.
3. The underwater sound absorption metamaterial with the damping lining hexagonal honeycomb perforated plate as claimed in claim 1, wherein: the diameter of the small hole of the perforated upper panel is 2-5 mm, and the small hole is circular, triangular, square, petal-shaped or irregular.
4. The underwater sound absorption metamaterial with the damping lining hexagonal honeycomb perforated plate as claimed in claim 1, wherein: the upper plate of the perforation has a thickness of 2-5 mm.
5. The underwater sound absorption metamaterial with the damping lining hexagonal honeycomb perforated plate as claimed in claim 1, wherein: the honeycomb layer core is made of structural steel and is in the shape of a square-layer honeycomb, a triangular-layer honeycomb, a hexagonal-layer honeycomb or a multi-size multi-shape hybrid-layer honeycomb.
6. The underwater sound absorption metamaterial with the damping lining hexagonal honeycomb perforated plate as claimed in claim 1, wherein: the length of the inner side of the honeycomb layer core is 25-40 mm.
7. The underwater sound absorption metamaterial with the damping lining hexagonal honeycomb perforated plate as claimed in claim 1, wherein: the thickness of the layered honeycomb layer core is 30-50 mm.
8. The underwater sound absorption metamaterial with the damping lining hexagonal honeycomb perforated plate as claimed in claim 1, wherein: the damping lining layer is made of a viscoelastic material and is made of rubber or polyurethane, and the thickness of the damping lining layer is 1 mm-4 mm.
9. The underwater sound absorption metamaterial with the damping lining hexagonal honeycomb perforated plate as claimed in claim 1, wherein: the lower panel is made of structural steel.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112669802A (en) * | 2020-12-11 | 2021-04-16 | 南京光声超构材料研究院有限公司 | Sound absorption structure and sound absorption device |
| CN113192478A (en) * | 2021-03-19 | 2021-07-30 | 阳春新钢铁有限责任公司 | Noise reduction method for bar finishing area |
| CN113997655A (en) * | 2021-11-09 | 2022-02-01 | 江苏科技大学 | Frequency-adjustable sound absorption and insulation light composite board and manufacturing method thereof |
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| CN105821980A (en) * | 2016-03-23 | 2016-08-03 | 西安交通大学 | Sound-absorbing loading plate with hexagonal honeycomb-corrugation complex structure |
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| CN112669802A (en) * | 2020-12-11 | 2021-04-16 | 南京光声超构材料研究院有限公司 | Sound absorption structure and sound absorption device |
| CN113192478A (en) * | 2021-03-19 | 2021-07-30 | 阳春新钢铁有限责任公司 | Noise reduction method for bar finishing area |
| CN113997655A (en) * | 2021-11-09 | 2022-02-01 | 江苏科技大学 | Frequency-adjustable sound absorption and insulation light composite board and manufacturing method thereof |
| CN113997655B (en) * | 2021-11-09 | 2023-09-29 | 江苏科技大学 | Frequency-adjustable sound absorption and insulation light composite board and manufacturing method thereof |
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