CN111739501B - Damping lining level honeycomb perforated plate underwater sound absorption structure - Google Patents

Damping lining level honeycomb perforated plate underwater sound absorption structure Download PDF

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CN111739501B
CN111739501B CN202010484809.1A CN202010484809A CN111739501B CN 111739501 B CN111739501 B CN 111739501B CN 202010484809 A CN202010484809 A CN 202010484809A CN 111739501 B CN111739501 B CN 111739501B
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honeycomb
perforated
panel
hierarchical
sound absorption
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CN111739501A (en
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卢天健
辛锋先
段明宇
何伟
于晨磊
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Nanjing University of Aeronautics and Astronautics
Xian Jiaotong University
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Nanjing University of Aeronautics and Astronautics
Xian Jiaotong University
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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 an underwater sound absorption structure of a damping lining level honeycomb perforated plate, which is characterized in that an upper panel, a level honeycomb layer core and a lower panel are perforated by welding or gluing to form a plurality of honeycomb resonant cavity units, damping lining layers are adhered on the side walls and the bottom surfaces of a central honeycomb resonant cavity unit and node honeycomb resonant cavity units, the acoustic impedance characteristic of the structure is improved, and the low-frequency sound absorption performance of the structure is improved. The lightweight hierarchical honeycomb sandwich plate structure reduces the weight of the structure and ensures the bearing performance of the structure on the premise of realizing good low-frequency underwater sound absorption performance.

Description

Damping lining level honeycomb perforated plate underwater sound absorption structure
Technical Field
The invention relates to the field of underwater sound absorption, in particular to an underwater sound absorption structure of a damping lining level honeycomb perforated plate.
Background
The acoustic metamaterial is an artificial periodic composite structure and has unusual 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 deep sub-wavelength scale structures is also one of the important special properties of acoustic metamaterials. In aeroacoustics, perfect absorption based on the helmholtz resonance principle can be achieved by structural design of spatial winding or double-layer perforation. By parallel connection of multiple cells with different geometric parameters, some of these structures also exhibit broadband absorption capability. In hydroacoustics, however, metamaterials that rely on viscous energy dissipation of air will no longer be suitable due to the near incompressibility and relatively small viscosity of water. Furthermore, at the same frequency, the acoustic wave length in water is 4 times or more that of air, which makes it more difficult to achieve complete absorption of low frequencies by a small-sized structure. The traditional underwater sound absorption materials/structures, such as sound absorption covering layers with cavities which are periodically arranged, local resonance type phonon crystals, impedance gradual change type sound absorption covering layers and other materials/structures, have the characteristics that most of matrixes are rubber or polyurethane, are required to be adhered to a steel shell of underwater equipment in actual working, increase the structural weight on one hand, have poor bearing performance on the other hand, and are easy to deform under the action of deep water load, so that the sound absorption performance of the underwater sound absorption materials/structures is weakened. In a comprehensive view, the structure generally has the problems of poor low-frequency sound absorption performance, heavier quality and poor bearing performance.
Disclosure of Invention
The invention provides an underwater sound absorption structure of a damping lining level honeycomb perforated plate, which aims to 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:
the utility model provides a damping inside lining level honeycomb perforated plate sound absorbing structure under water, includes perforation top panel, level honeycomb layer core, damping inner liner and lower panel, links to each other through welding or glue between perforation top panel, level honeycomb layer core and the lower panel, and the damping inner liner is pasted on the lateral wall of every central honeycomb and node honeycomb resonant cavity unit, forms a damping inside lining level honeycomb perforated plate sound absorbing structure under water.
According to the underwater sound absorption structure of the damping lining level honeycomb perforated plate, the upper panel, the level honeycomb layer core and the lower panel are perforated by welding or gluing to form a plurality of honeycomb resonant cavity units, and the damping lining layers are adhered on the side walls and the bottom surfaces of the central honeycomb resonant cavity unit and the node 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 lightweight hierarchical honeycomb sandwich plate structure reduces the weight of the structure and ensures the bearing performance of the structure on the premise of realizing good low-frequency underwater sound absorption performance.
Specifically, the perforated upper panel is made of structural steel, and small holes are formed in the perforated upper panel periodically, so that the structure has good bearing performance due to the application of the structural steel.
Further, each small hole on the perforated upper panel corresponds to each central honeycomb resonant cavity unit and node honeycomb resonant cavity unit in the hierarchical honeycomb layer core structure, the arrangement of the perforation enables the inside of the honeycomb unit to be communicated with the outside, and water flows into the inside of the honeycomb unit through the perforation to form a first layer of Helmholtz resonant cavity.
Further, the diameter of the center perforation of the perforation upper panel is 2-5 mm, the shape is round, triangle, square, petal-shaped or irregular, the diameter of the node perforation of the perforation upper panel is 2-5 mm, the shape is round, triangle, square, petal-shaped or irregular, the diameter of the perforation determines the diameter of a water column in the perforation, and the Helmholtz resonance characteristic of the structure can be changed by adjusting the diameter of the perforation, so that the sound absorption performance of the structure is adjusted.
Furthermore, the thickness of the perforated upper panel is 1-3 mm, so that the height of the water column in the perforation is determined on one hand, the resonance sound absorption characteristic of the structure is controlled, and on the other hand, the bearing performance of the structure can be adjusted.
Specifically, the hierarchical honeycomb layer core is made of structural steel, the shape is square hierarchical honeycomb, triangle hierarchical honeycomb, hexagonal hierarchical honeycomb or multi-size multi-shape hybrid hierarchical honeycomb and the like, a node honeycomb exists at the node of each central honeycomb, the hierarchical honeycomb layer core is used for bearing compression load, in addition, the honeycomb wall divides the structure into a plurality of units, the differential size design of different units can be realized, a plurality of resonance frequencies are formed, and the sound absorption bandwidth of the structure is increased.
Further, the side length of the central honeycomb of the layer honeycomb core of the layer is 15-45 mm, the side length of the node honeycomb of the layer honeycomb core of the layer honeycomb is 6-20 mm, the honeycomb cavity is used as a Helmholtz resonant cavity, the sound volume function is achieved, and the peak sound absorption frequency of the structure can be controlled by adjusting the inner side length of the honeycomb.
Further, the thickness of the layer honeycomb layer core is 30-60 mm, the size of the resonant cavity is determined by the thickness of the layer honeycomb layer core, and the sound absorption frequency band of the structure can be adjusted by changing the thickness of the layer honeycomb layer core.
Specifically, the damping lining layer is made of rubber or polyurethane and other viscoelastic materials and is adhered to the side wall of each central honeycomb resonant cavity unit and the side wall of each node honeycomb resonant cavity unit, and the adhesion of the damping lining layer provides additional acoustic resistance and acoustic capacity for the honeycomb resonant cavity, so that the impedance characteristic of the structure is improved, and the low-frequency underwater sound absorption of the structure is realized.
Further, the thickness of central honeycomb damping inner liner is 2~4mm, and the thickness of node honeycomb damping inner liner is 1~5mm, and the thickness of damping inner liner has decided the size of extra increase acoustic resistance and sound volume, can exert an influence to the acoustic impedance characteristic of structure, can realize the excellent sound absorption effect of specific frequency through reasonable design.
The invention has the beneficial effects that:
1. has excellent low-frequency sound absorption performance. The test piece has two sound absorption peaks within the range of 0-1500 Hz, widens the sound absorption bandwidth of the structure, and can achieve more than 0.99 sound absorption coefficient at certain frequency, thereby realizing perfect sound absorption. The thickness of the structure is only 1/80-1/53 of the wavelength at the perfect sound absorption frequency, and the structure is a deep sub-wavelength metamaterial with perfect sound absorption performance.
2. Has good bearing performance and light weight performance. The perforated upper panel, the hierarchical honeycomb layer core and the lower panel form a light hierarchical honeycomb sandwich plate structure, and the structure has good pressure resistance and bending resistance and is a bearing and light multifunctional structure.
3. With more adjustable parameters and variables. The central perforation diameter of the perforated upper panel, the perforation diameter of the perforated upper panel node, the perforated upper panel thickness, the level honeycomb layer core height, the central honeycomb side length, the node honeycomb side length, the central honeycomb damping lining layer thickness and the node honeycomb damping lining layer thickness are all adjustable parameters, and can be selected and adjusted reasonably according to specific use scenes, such as requirements on bearing performance or acoustic performance.
4. Simple structure and easy manufacture.
Drawings
FIG. 1 is a schematic view of an underwater sound absorption structure of a damped liner layer honeycomb perforated panel according to the present invention;
FIG. 2 is a graph showing sound absorption coefficients within 0-1500 Hz for three embodiments of the present invention.
Wherein: 1. perforating the upper panel; 2. a hierarchical honeycomb layer core; 3. a damping inner liner; 4. and a lower panel.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention provides an underwater sound absorption structure of a damping lining level honeycomb perforated plate, which is characterized in that an upper panel 1, a level honeycomb layer core 2 and a lower panel 4 are perforated by welding or cementing to form a plurality of level parallel honeycomb resonant cavity units, and damping lining layers 3 are adhered on the side walls of a central honeycomb resonant cavity unit and node 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 lightweight level honeycomb sandwich plate structure reduces the weight of the structure on the premise of realizing good low-frequency underwater sound absorption performance, ensures the bearing performance of the structure, 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 present invention provides an underwater sound absorption structure of a damping lining level honeycomb perforated plate, comprising: the perforated upper panel 1, the hierarchical honeycomb layer core 2, the damping lining layer 3 and the lower panel 4 are connected through welding or gluing, the damping lining layer 3 is adhered to the side wall of each central honeycomb resonant cavity unit and the side wall of each node honeycomb resonant cavity unit, and an underwater sound absorption structure of the damping lining hierarchical honeycomb perforated plate is formed, and a structural schematic diagram is shown in fig. 1.
The perforated upper panel 1 is made of structural steel, the perforated upper panel 1 is periodically provided with small holes, each small hole on the perforated upper panel 1 corresponds to each central honeycomb resonant cavity unit and each node honeycomb resonant cavity unit in the hierarchical honeycomb layer core structure 2, the diameter of the central perforation of the perforated upper panel 1 is 2-5 mm, the shape is round, triangular, square, petal-shaped or irregular, the diameter of the node perforation of the perforated upper panel 1 is 2-5 mm, the shape is round, triangular, square, petal-shaped or irregular, and the thickness of the perforated upper panel 1 is 1-3 mm.
The layer honeycomb layer core 2 is made of structural steel, and is in the shape of square layer honeycomb, triangle layer honeycomb, hexagonal layer honeycomb or multi-size multi-shape hybrid layer honeycomb and the like, a node honeycomb exists at the node of each central honeycomb, the side length of the central honeycomb of the layer honeycomb layer core 2 is 15-45 mm, the side length of the node honeycomb of the layer honeycomb layer core 2 is 6-20 mm, and the thickness of the layer honeycomb layer core 2 is 30-60 mm.
The damping lining layer 3 is made of rubber or polyurethane and other viscoelastic materials, and is adhered to the side wall of each central honeycomb resonant cavity unit and the side wall of each node honeycomb resonant cavity unit, the thickness of the central honeycomb damping lining layer 3 is 2-4 mm, and the thickness of the node honeycomb damping lining layer 3 is 1-5 mm.
The lower panel 4 is made of structural steel and the lower surface is fixed to underwater equipment requiring acoustic treatment.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, 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 invention, as 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 made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The sound absorption performance of the sound absorption type honeycomb resonant cavity is mainly determined by the layer honeycomb resonant cavity, and the sound absorption type honeycomb resonant cavity comprises a center perforation diameter of the perforated upper panel, a node perforation diameter of the perforated upper panel, a thickness of the perforated upper panel, a height of the layer honeycomb layer core, a side length of a center honeycomb, a side length of a node honeycomb, a thickness of the center honeycomb damping lining layer and a thickness of the node honeycomb damping lining layer. The load bearing and lightweight properties are mainly determined by the panel and the hierarchical honeycomb layer core, including perforated upper panel thickness, hierarchical honeycomb layer core height, central honeycomb side length, node honeycomb side length, etc. Because these structural parameters are all adjustable parameters, can realize corresponding sound absorption, bear and lightweight performance requirement through adjusting. The technical scheme of the invention is exemplified by the following specific examples.
Examples materials:
structural steel: it is characterized by a density of 7850kg/m 3 Young's modulus 200GPa, poisson's ratio 0.3.
Rubber: it is characterized by density of 1100kg/m 3 Young's modulus 10MPa, poisson's ratio 0.49, and equivalent isotropy loss factor 0.3.
Water: it is characterized by density of 1000kg/m 3 The sound velocity is 1500m/s, and the dynamic viscosity coefficient is 0.00101 Pa.s.
The structural dimensions and material selection of the embodiments:
example 1
The center of the perforated upper panel is perforated with a diameter of 3mm, the node of the perforated upper panel is perforated with a diameter of 2mm, the perforated upper panel is 3mm thick, the height of the hierarchical honeycomb layer core is 60mm, the side length of the central honeycomb is 30mm, the side length of the node honeycomb is 8mm, the thickness of the central honeycomb damping lining layer is 3mm, and the thickness of the node honeycomb damping lining layer is 3mm.
Example 2
The center of the perforated upper panel is perforated with the diameter of 2mm, the node of the perforated upper panel is perforated with the diameter of 3mm, the thickness of the perforated upper panel is 2mm, the height of the hierarchical honeycomb layer core is 50mm, the side length of the central honeycomb is 15mm, the side length of the node honeycomb is 6mm, the thickness of the central honeycomb damping lining layer is 2mm, and the thickness of the node honeycomb damping lining layer is 1mm.
Example 3
The center of the perforated upper panel is provided with a perforation diameter of 5mm, the perforation diameter of a perforation upper panel node is 5mm, the thickness of the perforated upper panel is 1mm, the height of the hierarchical honeycomb layer core is 30mm, the side length of the central honeycomb is 45mm, the side length of the node honeycomb is 20mm, the thickness of the central honeycomb damping lining layer is 4mm, and the thickness of the node honeycomb damping lining layer is 5mm.
Referring to fig. 2, the helmholtz resonance phenomenon at low frequencies can achieve perfect sound absorption in a certain frequency range. By sticking the damping lining layer on the side wall of the hierarchical honeycomb resonant cavity, the acoustic impedance characteristic of the structure is improved, and the rubber layer provides additional acoustic impedance and acoustic capacity, so that Helmholtz-like resonance is formed, and the underwater low-frequency perfect sound absorption is realized. In addition, through the design of the hierarchical parallel cavity, the invention obtains a plurality of resonance frequencies and generates a sound absorption peak value with lower frequency, thereby realizing the excellent sound absorption effect of low frequency.
Referring to fig. 2, embodiment 1 has two sound absorption peaks at 298Hz and 480Hz respectively, wherein the first sound absorption peak is 0.99, which is a perfect sound absorption peak, the second sound absorption peak is 0.84, the two sound absorption peaks correspond to the resonance sound absorption frequencies of the central honeycomb resonant cavity and the honeycomb resonant cavity at the node, the half sound absorption band of the structure is 224-578 Hz, the bandwidth is 328Hz, the structure has good low-frequency sound absorption performance, the thickness of the structure is 63mm at this time, which corresponds to 1/80 of the sound wave wavelength of the perfect sound absorption frequency, and the structure has deep sub-wavelength attribute;
the embodiment 2 has two sound absorption peaks at 549Hz and 1257Hz respectively, wherein the first sound absorption peak is 0.99, the second sound absorption peak is 0.99, the two sound absorption peaks respectively correspond to the resonance sound absorption frequency of the central honeycomb resonant cavity and the honeycomb resonant cavity at the node, the sound absorption peak of the structure at 380-1500 Hz is greater than 0.5, the sound absorption performance of the low-frequency broadband is good, the thickness of the structure is 52mm, the sound absorption peak corresponds to 1/53 of the sound wave wavelength of the perfect sound absorption frequency, and the structure has deep sub-wavelength attribute;
the distance between two sound absorption peaks in embodiment 3 is very close, so that a sound absorption coefficient curve forms a perfect sound absorption platform area, the sound absorption coefficient of the structure is greater than 0.99 in the frequency range of 605-697 Hz, perfect sound absorption in the frequency range of 82Hz is realized, excellent low-frequency width perfect sound absorption capacity is achieved, the thickness of the structure is 31mm at the moment, 1/80 of the sound wave wavelength corresponding to the perfect sound absorption frequency is achieved, and the structure has deep sub-wavelength attribute;
the sound absorption coefficient curve shows that the invention can realize excellent low-frequency sound absorption performance in a certain frequency range, and the acoustic performance can be regulated by the design of different structural parameters.
The present invention has been described in terms of the preferred embodiments thereof, and it should be understood by those skilled in the art that various modifications can be made without departing from the principles of the invention, and such modifications should also be considered as being within the scope of the invention.

Claims (10)

1. A damping lining level honeycomb perforated plate sound absorbing structure under water, its characterized in that: the device comprises a perforated upper panel, a hierarchical honeycomb layer core, a damping lining layer and a lower panel, wherein the perforated upper panel, the hierarchical honeycomb layer core and the lower panel are connected through welding or cementing, the lower surface of the lower panel is fixed on underwater equipment needing acoustic treatment, the hierarchical honeycomb layer core comprises a central honeycomb resonant cavity unit and node honeycomb resonant cavity units, and a node honeycomb is arranged at a node of each central honeycomb; the perforated upper panel is provided with small holes periodically, and each small hole corresponds to each central honeycomb resonant cavity unit and node honeycomb resonant cavity unit in the hierarchical honeycomb layer core structure; the damping lining layer is adhered to the side wall of each central honeycomb and node honeycomb resonant cavity unit to form the underwater sound absorption structure of the damping lining layer honeycomb perforated plate.
2. The damped liner level honeycomb perforated panel underwater sound absorbing structure of claim 1, wherein: the perforated upper panel is made of structural steel.
3. The damped liner level honeycomb perforated panel underwater sound absorbing structure of claim 1, wherein: the diameter of the small hole of the perforated upper panel is 2-5 mm, and the shape of the small hole is round, triangular, square, petal-shaped or irregular.
4. The damped liner level honeycomb perforated panel underwater sound absorbing structure of claim 1, wherein: the thickness of the perforated upper panel is 1-3 mm.
5. The damped liner level honeycomb perforated panel underwater sound absorbing structure of claim 1, wherein: the hierarchical honeycomb layer core is made of structural steel and is square hierarchical honeycomb, triangular hierarchical honeycomb, hexagonal hierarchical honeycomb or multi-size multi-shape hybrid hierarchical honeycomb.
6. The damped liner level honeycomb perforated panel underwater sound absorbing structure of claim 1, wherein: the side length of the central honeycomb of the hierarchical honeycomb layer core is 15-45 mm.
7. The damped liner level honeycomb perforated panel underwater sound absorbing structure of claim 1, wherein: the honeycomb side length of the hierarchical honeycomb layer core node is 6-20 mm.
8. The damped liner level honeycomb perforated panel underwater sound absorbing structure of claim 1, wherein: the thickness of the hierarchical honeycomb layer core is 30-60 mm.
9. The damped liner level honeycomb perforated panel underwater sound absorbing structure of claim 1, wherein: the damping lining layer is made of a viscoelastic material, rubber or polyurethane is adopted, the thickness of the central honeycomb damping lining layer is 2-4 mm, and the thickness of the node honeycomb damping lining layer is 1-5 mm.
10. The damped liner level honeycomb perforated panel underwater sound absorbing structure of claim 1, wherein: the lower panel is made of structural steel.
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CN113074203B (en) * 2021-03-15 2023-01-24 天津大学 Vibration isolation device based on two-dimensional elastic wave metamaterial and particle collision damping
CN113192479A (en) * 2021-04-28 2021-07-30 中国人民解放军国防科技大学 Thin-layer low-frequency underwater sound insulation metamaterial
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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