Underwater sound absorption metamaterial structure with damping lining and double-layer honeycomb perforated plate
阅读说明：本技术 一种阻尼内衬双层蜂窝穿孔板水下吸声超材料结构 (Underwater sound absorption metamaterial structure with damping lining and double-layer honeycomb perforated plate ) 是由 辛锋先 卢天健 段明宇 何伟 于晨磊 于 2020-06-01 设计创作，主要内容包括：本发明公开了一种阻尼内衬双层蜂窝穿孔板水下吸声超材料结构,从上至下包括依次连接的穿孔上面板、第一层蜂窝层芯、夹层穿孔面板、第二层蜂窝层芯和下面板,第一层蜂窝层芯和第二层蜂窝层芯内均设置有多个蜂窝共振腔单元,穿孔上面板上对应第一层蜂窝层芯结构的每个蜂窝共振腔单元周期性开设有第一孔,夹层穿孔面板上对应第二层蜂窝层芯的每个蜂窝共振腔单元周期性开设有第二孔；第一层蜂窝层芯的每一个蜂窝共振腔单元内设置有第一阻尼内衬层,第二层蜂窝层芯的每一个蜂窝共振腔单元内设置有第二阻尼内衬层。本发明具有优异的低频吸声性能以及良好的承载性能和轻量化性能,可根据实际工况需求进行相应调节,结构简单,易于制造。(The invention discloses an underwater sound absorption metamaterial structure with a damping lining double-layer honeycomb perforated plate, which comprises a perforated upper panel, a first honeycomb layer core, an interlayer perforated panel, a second honeycomb layer core and a lower panel which are sequentially connected from top to bottom, wherein a plurality of honeycomb resonant cavity units are arranged in the first honeycomb layer core and the second honeycomb layer core; a first damping lining layer is arranged in each honeycomb resonant cavity unit of the first layer of honeycomb layer core, and a second damping lining layer is arranged in each honeycomb resonant cavity unit of the second layer of honeycomb layer core. The invention has excellent low-frequency sound absorption performance, good bearing performance and light weight performance, can be correspondingly adjusted according to the requirements of actual working conditions, has simple structure and is easy to manufacture.)
1. The underwater sound absorption metamaterial structure with the damping lining double-layer honeycomb perforated plate is characterized by comprising a perforated upper panel (1), a first honeycomb layer core (2), an interlayer perforated panel (4), a second honeycomb layer core (5) and a lower panel (7) which are sequentially connected from top to bottom, wherein a plurality of honeycomb resonant cavity units are arranged in the first honeycomb layer core (2) and the second honeycomb layer core (5), a first hole is periodically formed in the perforated upper panel (1) corresponding to each honeycomb resonant cavity unit of the first honeycomb layer core structure (2), and a second hole is periodically formed in the interlayer perforated panel (4) corresponding to each honeycomb resonant cavity unit of the second honeycomb layer core (5); a first damping lining layer (3) is arranged in each honeycomb resonant cavity unit of the first layer of honeycomb layer core (2), and a second damping lining layer (6) is arranged in each honeycomb resonant cavity unit of the second layer of honeycomb layer core (5).
2. The underwater sound absorption metamaterial structure with the damping lining and the double-layer honeycomb perforated plate as claimed in claim 1, wherein the diameter of the first hole is 2.5-4 mm, and the shape of the first hole comprises a circle, a triangle, a square, a petal shape or an irregular shape.
3. The underwater sound absorption metamaterial structure with the damping lining and the double-layer honeycomb perforated plate as claimed in claim 1, wherein the perforated upper panel (1) is 1.5-3.5 mm thick.
4. The underwater sound absorption metamaterial structure with the damping lining double-layer honeycomb perforated plate as claimed in claim 1, wherein the thickness of the first layer honeycomb layer core (2) is 25-40 mm, the inner edge length of each honeycomb in the first layer honeycomb layer core (2) is 25-40 mm, and the honeycomb shape comprises hexagonal honeycomb, circular honeycomb, triangular honeycomb, square honeycomb or multi-size multi-shape hybrid honeycomb.
5. The underwater sound absorption metamaterial structure with the damping lining and the double-layer honeycomb perforated plate as claimed in claim 1 or 4, wherein the thickness of the second damping lining layer (3) is 1-3 mm, and the second damping lining layer is adhered to the side wall of each honeycomb resonant cavity unit of the first honeycomb layer core (2).
6. The underwater sound absorption metamaterial structure with the damping lining and the double-layer honeycomb perforated plate as claimed in claim 1, wherein the diameter of the second holes is 1.5-3 mm, and the shape of the second holes comprises a circle, a triangle, a square, a petal shape or an irregular shape.
7. The underwater sound absorption metamaterial structure with the damping lining and the double-layer honeycomb perforated plate as claimed in claim 1, wherein the thickness of the sandwich perforated panel (4) is 1-3 mm.
8. The underwater sound absorption metamaterial structure with the damping lining and double-layer honeycomb perforated plates as claimed in claim 1, wherein the thickness of the second-layer honeycomb layer core (5) is 20-35 mm, the inner side length of each honeycomb in the second-layer honeycomb layer core (5) is 25-40 mm, and the honeycomb shape comprises hexagonal honeycomb, circular honeycomb, triangular honeycomb, square honeycomb or multi-size multi-shape hybrid honeycomb.
9. The underwater sound absorption metamaterial structure with the damping lining and the double-layer honeycomb perforated plate as claimed in claim 1 or 8, wherein the thickness of the second damping lining layer (6) is 2-4 mm, and the second damping lining layer is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit of the second honeycomb layer core (5).
10. The underwater sound absorption metamaterial structure with the damping lining and the double-layer honeycomb perforated plate as claimed in claim 1, wherein the lower panel (7) is made of structural steel, and the lower surface (7) is fixed on underwater equipment needing acoustic treatment.
Technical Field
The invention belongs to the technical field of acoustic metamaterials, and particularly relates to an underwater sound absorption metamaterial structure with a damping lining and double-layer honeycomb perforated plates.
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 through a structural design of space winding or double-layer 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 technical problem to be solved by the invention is to provide an underwater sound absorption metamaterial structure with a damping lining double-layer honeycomb perforated plate aiming at the defects in the prior art, and solve 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:
a damping lining double-layer honeycomb perforated plate underwater sound absorption metamaterial structure comprises a perforated upper panel, a first honeycomb layer core, an interlayer perforated panel, a second honeycomb layer core and a lower panel which are sequentially connected from top to bottom, wherein a plurality of honeycomb resonant cavity units are arranged in the first honeycomb layer core and the second honeycomb layer core; a first damping lining layer is arranged in each honeycomb resonant cavity unit of the first layer of honeycomb layer core, and a second damping lining layer is arranged in each honeycomb resonant cavity unit of the second layer of honeycomb layer core.
Specifically, the diameter of the first hole is 2.5-4 mm, and the shape of the first hole comprises a circle, a triangle, a square, a petal shape or an irregular shape.
Specifically, the thickness of the upper plate of the perforation is 1.5-3.5 mm.
Specifically, the thickness of the first layer honeycomb layer core is 25-40 mm, the inner side length of each honeycomb in the first layer honeycomb layer core is 25-40 mm, and the honeycomb shape comprises a hexagonal honeycomb, a circular honeycomb, a triangular honeycomb, a square honeycomb or a multi-size multi-shape hybrid honeycomb.
Furthermore, the thickness of the second layer of damping lining layer is 1-3 mm, and the second layer of damping lining layer is pasted on the side wall of each honeycomb resonant cavity unit of the first layer of honeycomb layer core.
Specifically, the diameter of the second hole is 1.5-3 mm, and the shape of the second hole comprises a circle, a triangle, a square, a petal shape or an irregular shape.
Specifically, the thickness of the interlayer perforated panel is 1-3 mm.
Specifically, the thickness of the second layer honeycomb layer core is 20-35 mm, the length of the inner side of each honeycomb in the second layer honeycomb layer core is 25-40 mm, and the honeycomb shape comprises a hexagonal honeycomb, a circular honeycomb, a triangular honeycomb, a square honeycomb or a multi-size and multi-shape hybrid honeycomb.
Furthermore, the thickness of the second layer of damping lining layer is 2-4 mm, and the second layer of damping lining layer is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit of the second layer of honeycomb layer core.
Specifically, the lower panel is made of structural steel, and the lower surface of the lower panel is fixed on underwater equipment needing acoustic treatment.
Compared with the prior art, the invention has at least the following beneficial effects:
according to the underwater sound absorption metamaterial structure with the damping lining double-layer 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. On the premise of realizing good low-frequency underwater sound absorption performance, the lightweight 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 weight and poor bearing performance of the traditional underwater sound absorption structure, each first hole on a perforated upper panel corresponds to one honeycomb resonant cavity unit in a first honeycomb layer core structure, the inside of the honeycomb unit is communicated with the outside through the arrangement of the perforations, water flows into the honeycomb unit through the perforations to form a first layer Helmholtz resonant cavity, the sandwich perforated panel is made of structural steel, second holes are periodically opened on the sandwich perforated panel, the structure has good bearing performance through the application of the structural steel, each small hole on the sandwich perforated panel corresponds to one honeycomb resonant cavity unit in a second layer honeycomb layer core structure, and the arrangement of the perforations enables the first layer honeycomb unit to be communicated with the second layer honeycomb unit, water flows into the honeycomb units through the perforations to form the series Helmholtz resonance cavities.
Specifically, the fenestrate diameter of top panel is 2.5 ~ 4mm, and the shape is circular, triangle-shaped, square, petal shape or irregularly shaped, and the diameter of perforation interior water column has been decided to the fenestrate diameter, can change the Helmholtz resonance characteristic of structure through adjusting the perforation diameter to adjust the sound absorption performance of structure, the perforation top panel is made by structural steel, and above-mentioned periodic opening has first hole, and structural steel's application makes the structure have good bearing capacity.
Furthermore, the thickness of the perforated upper panel is 1.5-3.5 mm, and the thickness of the perforated upper panel determines the height of a water column in the perforated upper panel 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.
Further, the length is 25 ~ 40mm in the first layer honeycomb, the honeycomb cavity is as the Helmholtz resonant cavity, the effect of sound volume has been played, length in through the adjustment honeycomb, the peak value sound absorption frequency of structure can be controlled, first layer honeycomb layer core is made by the structural steel, the shape is square honeycomb, circular honeycomb, the triangle-shaped honeycomb, the mixed honeycomb of hexagonal honeycomb or the many shapes of many sizes, the honeycomb layer core is used for bearing compression load, furthermore, the honeycomb wall is split into a plurality of units with the structure, can realize the differentiation size design of different units, form a plurality of resonant frequency, increase the sound absorption bandwidth of structure, the thickness of first layer honeycomb layer core is 25 ~ 40mm, the size of resonant cavity has been decided to the thickness of honeycomb layer core, change the sound absorption frequency band that honeycomb layer core thickness can adjust the structure.
Further, first layer damping inside lining layer thickness is 1 ~ 3mm, the thickness of damping inside lining layer has decided the size of extra acoustic resistance and the sound capacity that increases, can exert an influence to the acoustic impedance characteristic of structure, can realize specific frequency's excellent sound absorption effect through rational design, first layer damping inside lining layer is made by viscidity elastic material such as rubber or polyurethane, paste on the lateral wall of each honeycomb resonant cavity unit of first layer, pasting of damping inside lining layer provides extra acoustic resistance and sound capacity for the honeycomb resonant cavity, the impedance characteristic of structure has been improved, be favorable to realizing the low frequency of structure and absorb sound under water.
Further, the diameter in second hole is 1.5 ~ 3mm, and the shape is circular, triangle-shaped, square, petal shape or irregularly shaped, 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 interlayer perforated panel is 1-3 mm, the thickness of the interlayer perforated panel determines the height of a water column in a perforated hole on one hand, the resonance sound absorption characteristic of the structure is controlled, and the bearing performance of the structure can be adjusted on the other hand.
Further, the length is 25 ~ 40mm in the honeycomb of second floor, the honeycomb cavity is as the Helmholtz resonant cavity, the effect of sound volume has been played, length in through the adjustment honeycomb, the peak value sound absorption frequency of structure can be controlled, second floor honeycomb layer core is made by the structural steel, the shape is square honeycomb, circular honeycomb, triangle-shaped honeycomb, the mixed honeycomb of hexagonal honeycomb or many shapes of many sizes, honeycomb layer core is used for bearing compression load, furthermore, honeycomb wall splits the structure into a plurality of units, can realize the differentiation size design of different units, form a plurality of resonant frequency, increase the sound absorption bandwidth of structure.
Furthermore, the thickness of the second layer honeycomb layer core is 20-35 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.
Further, the thickness of the second layer damping lining layer is 2-4 mm, the thickness of the damping lining layer determines the size of extra increased sound resistance and sound capacity, the sound impedance characteristic of the structure can be influenced, the excellent sound absorption effect of specific frequency can be realized through reasonable design, the second layer damping lining layer is made of rubber or polyurethane and other viscous elastic materials, the second layer damping lining layer is pasted on the side wall and the bottom surface of each honeycomb resonant cavity unit of the second layer, the pasting of the damping lining layer provides extra sound resistance and sound capacity for the honeycomb resonant cavity, the impedance characteristic of the structure is improved, and the low-frequency underwater sound absorption of the structure is favorably realized.
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 an underwater sound absorption structure of the present invention, wherein (a) is an overall explosion diagram and (b) is a sectional view of a honeycomb resonant cavity unit;
FIG. 2 is a schematic diagram of sound absorption coefficients within 0-500 Hz of three embodiments of the present invention.
Wherein: 1. perforating the upper panel; 2. a first layer of honeycomb core; 3. a first layer of damping liner layer; 4. an interlayer perforated panel; 5. a second layer of honeycomb core; 6. a second layer of damping liner layer; 7. 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. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. 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 metamaterial structure with a damping lining double-layer honeycomb perforated plate, which is characterized in that a perforated upper panel, a first honeycomb layer core, an interlayer perforated panel, a second honeycomb layer core and a lower panel are sequentially connected from top to bottom in a welding or gluing mode to form a double-layer series honeycomb resonant cavity unit, a first damping lining layer is pasted on the side wall of the first honeycomb resonant cavity unit, a second damping lining layer is pasted on the side wall and the bottom surface of the second honeycomb resonant cavity unit, and the underwater sound absorption metamaterial structure is formed by a plurality of double-layer series 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. 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, the underwater sound absorption metamaterial structure with a damping lining double-layer honeycomb perforated plate of the present invention includes a perforated
The perforated
Preferably, the shape of the first hole is not limited to a circle, a triangle, a square, a petal shape or an irregular shape.
First layer
Preferably, the honeycomb shape of the first-layer
The second layer of damping
Preferably, the material of the second damping
The sandwich layer perforated
Preferably, the shape of the second hole is not limited to a circle, a triangle, a square, a petal shape or an irregular shape.
Second layer
Preferably, the honeycomb shape in the second
The second layer of damping
Preferably, the material of the second damping
The
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 sound absorption type sandwich honeycomb structure is mainly determined by a honeycomb resonant cavity and comprises a perforated upper panel, a first honeycomb layer core, a second damping inner liner layer and a lower panel, wherein the perforated upper panel is perforated, the first honeycomb layer core is high, the inner side length of the first honeycomb layer is long, the thickness of the first damping inner liner layer is thick, the perforated panel is perforated, the sandwich perforated panel is thick, the second honeycomb layer core is high, the inner side length of the second honeycomb layer is long, and the thickness of the second damping inner liner layer is determined. The bearing and light weight performance is mainly determined by the panel and the honeycomb layer core, and comprises a perforated upper panel thickness, a first layer honeycomb layer core height, a first layer honeycomb inner edge length, an interlayer perforated panel thickness, a second layer honeycomb layer core height, a second layer honeycomb inner edge length 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.
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