CN111739501A - Underwater sound absorption structure of damping lining level honeycomb perforated plate - Google Patents

Underwater sound absorption structure of damping lining level honeycomb perforated plate Download PDF

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CN111739501A
CN111739501A CN202010484809.1A CN202010484809A CN111739501A CN 111739501 A CN111739501 A CN 111739501A CN 202010484809 A CN202010484809 A CN 202010484809A CN 111739501 A CN111739501 A CN 111739501A
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honeycomb
hierarchical
damping
layer
sound absorption
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CN111739501B (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 layer honeycomb perforated plate, which is characterized in that an upper panel, a layer 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 pasted on the side walls and the bottom surfaces of a central honeycomb resonant cavity unit and a node honeycomb resonant cavity unit, 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-weight hierarchical 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.

Description

Underwater sound absorption structure of damping lining level honeycomb perforated plate
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 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 invention provides an underwater sound absorption structure of a damping lining-level honeycomb perforated plate, aiming at solving 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 is sound-absorbing structure under water, includes perforation upper panel, level honeycomb layer core, damping inner liner and lower panel, links to each other through welding or gluing between perforation upper panel, level honeycomb layer core and the lower panel, and the damping inner liner is pasted on the lateral wall of each 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 the plurality of honeycomb resonant cavity units, and the damping lining layers are adhered to 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 light-weight hierarchical 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.
Specifically, 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 each central honeycomb resonant cavity unit and each node honeycomb resonant cavity unit in the hierarchical 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 first layer of Helmholtz resonant cavities.
Further, the perforated diameter of perforation top panel central authorities is 2~5mm, and the shape is circular, triangle-shaped, square, petal shape or irregularly shaped, and the perforated diameter of perforation top panel node is 2~5mm, 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 perforated diameter, 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 perforated upper panel is 1-3 mm, and the thickness of the perforated upper panel determines the height of a water column in the perforated upper panel, controls the resonance sound absorption characteristic of the structure and can adjust the bearing performance of the structure.
Specifically, the hierarchical honeycomb layer core is made of structural steel, is in the shape of a square hierarchical honeycomb, a triangular hierarchical honeycomb, a hexagonal hierarchical honeycomb or a multi-size multi-shape hybrid hierarchical honeycomb and the like, a node honeycomb exists at a node of each central honeycomb, and the hierarchical honeycomb layer core is used for bearing a compression load.
Further, level honeycomb layer core central authorities honeycomb length of side is 15~45mm, and level honeycomb layer core node honeycomb length of side is 6~20mm, and the honeycomb cavity is regarded as helmholtz resonant cavity, has played the effect of sound capacity, and through the length in the adjustment honeycomb, the peak value sound absorption frequency of structure can be controlled.
Furthermore, the thickness of the hierarchical honeycomb layer core is 30-60 mm, the size of the resonance cavity is determined by the thickness of the hierarchical honeycomb layer core, and the sound absorption frequency band of the structure can be adjusted by changing the thickness of the hierarchical honeycomb layer core.
Specifically, the damping lining layer is made of sticky elastic materials such as rubber or polyurethane and is pasted on the side wall of each central honeycomb resonant cavity unit and each node honeycomb resonant cavity unit, and the pasting of the damping lining layer provides extra 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 favorably realized.
Further, the thickness of central authorities '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 the acoustic resistance and the sound volume of extra increase, can exert an influence to the acoustic impedance characteristic of structure, can realize specific frequency's excellent sound absorption effect through rational design.
The invention has the beneficial effects that:
1. has excellent low-frequency sound absorption performance. The test piece has two sound absorption peak values within the range of 0-1500 Hz, the sound absorption bandwidth of the structure is widened, and the sound absorption coefficient can reach more than 0.99 at certain frequencies, so that perfect sound absorption is realized. And 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 of the invention jointly form a light hierarchical 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 central perforation diameter of the perforated upper panel, the node perforation diameter of the perforated upper panel, the thickness of the perforated upper panel, the height of a hierarchical honeycomb layer core, the side length of a central honeycomb, the side length of a node honeycomb, the thickness of a central honeycomb damping lining layer and the thickness of a node honeycomb damping lining layer are adjustable parameters, and can be selected and adjusted reasonably according to specific use scenes, such as the requirement on bearing performance or the requirement on acoustic performance.
4. Simple structure and easy manufacture.
Drawings
FIG. 1 is a schematic view of an underwater sound absorption structure of a damping lining-level honeycomb perforated plate according to the present invention;
FIG. 2 is a schematic diagram of sound absorption coefficients within 0-1500 Hz of three embodiments of the present invention.
Wherein: 1. perforating the upper panel; 2. a hierarchical 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 structure of a damping lining layer honeycomb perforated plate, which is characterized in that an upper panel 1, a layer honeycomb layer core 2 and a lower panel 4 are perforated by welding or gluing to form a plurality of layer parallel honeycomb resonant cavity units, and damping lining layers 3 are adhered to 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. On the premise of realizing good low-frequency underwater sound absorption performance, the light-weight hierarchical 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 present invention provides an underwater sound absorption structure of a damping lining-layer honeycomb perforated plate, including: the underwater sound absorption structure comprises a perforated upper panel 1, a hierarchical honeycomb layer core 2, a damping lining layer 3 and a lower panel 4, wherein the perforated upper panel 1, the hierarchical honeycomb layer core 2 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 each node honeycomb resonant cavity unit, and the underwater sound absorption structure of the damping lining hierarchical honeycomb perforated plate is formed and is shown in the schematic structural diagram of fig. 1.
The perforated upper panel 1 is made of structural steel, small holes are periodically formed in the perforated upper panel 1, each small hole in 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 perforated upper panel is circular, triangular, square, petal-shaped or irregular, the diameter of the node perforation of the perforated upper panel 1 is 2-5 mm, the perforated upper panel is circular, triangular, square, petal-shaped or irregular, and the thickness of the perforated upper panel 1 is 1-3 mm.
The hierarchical honeycomb layer core 2 is made of structural steel and is in the shape of a square hierarchical honeycomb, a triangular hierarchical honeycomb, a hexagonal hierarchical honeycomb or a multi-size multi-shape hybrid hierarchical honeycomb, a node honeycomb exists at a node of each central honeycomb, the side length of the central honeycomb of the hierarchical honeycomb layer core 2 is 15-45 mm, the side length of the node honeycomb of the hierarchical honeycomb layer core 2 is 6-20 mm, and the thickness of the hierarchical honeycomb layer core 2 is 30-60 mm.
Damping inner liner 3 is made by the sticky elastic material such as rubber or polyurethane, pastes on the lateral wall of each central authorities 'honeycomb resonant cavity unit and node honeycomb resonant cavity unit, and central authorities' honeycomb damping inner liner 3's thickness is 2~4mm, and node honeycomb damping inner liner 3's thickness is 1~5 mm.
The lower panel 4 is made of structural steel and the lower surface 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 sound absorption type sound absorption device is mainly determined by a hierarchical honeycomb resonant cavity and comprises the central perforation diameter of a perforated upper panel, the node perforation diameter of the perforated upper panel, the thickness of the perforated upper panel, the height of the hierarchical honeycomb layer core, the side length of a central honeycomb, the side length of a node honeycomb, the thickness of a central honeycomb damping lining layer and the thickness of a node honeycomb damping lining layer. The bearing and lightweight performance is mainly determined by the panel and the layered honeycomb layer core, and comprises the thickness of the panel on the perforated panel, the height of the layered honeycomb layer core, the side length of the central honeycomb, the side length of the node 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
Punch the perforation diameter 3mm of panel central authorities above, punch the perforation diameter 2mm of panel node above, punch panel thickness 3mm above, level honeycomb layer core height 60mm, central honeycomb length of side 30mm, node honeycomb length of side 8mm, central honeycomb damping inner liner thickness 3mm, node honeycomb damping inner liner thickness 3 mm.
Example 2
Punch the perforation diameter 2mm of panel central authorities above, punch the perforation diameter 3mm of panel node, punch panel thickness 2mm above, level honeycomb layer core height 50mm, central authorities 'honeycomb length of side 15mm, node honeycomb length of side 6mm, central authorities' honeycomb damping inner liner thickness 2mm, node honeycomb damping inner liner thickness 1 mm.
Example 3
Perforation upper panel central authorities perforation diameter 5mm, perforation upper panel node perforation diameter 5mm, perforation upper panel thickness 1mm, level honeycomb layer core height 30mm, central honeycomb length of side 45mm, node honeycomb length of side 20mm, central honeycomb damping inside liner thickness 4mm, node honeycomb damping inside liner thickness 5 mm.
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 side wall of the hierarchical 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. In addition, through the design of the hierarchical parallel cavity, a plurality of resonance frequencies are obtained, and a sound absorption peak value of lower frequency is generated, so that the sound absorption effect of the low frequency is excellent.
Referring to fig. 2, in example 1, the two sound absorption peaks are 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 node honeycomb resonant cavity respectively, the half sound absorption band of the structure is 224 to 572Hz, the bandwidth is 328Hz, and the structure has good low-frequency sound absorption performance, at this time, the thickness of the structure is 63mm, which corresponds to 1/80 of the wavelength of sound wave of the perfect sound absorption frequency, and the structure has a deep sub-wavelength property;
the sound absorption peak value of the structure is equal to 0.5, the sound absorption peak value of the structure is greater than 0.5, the sound absorption peak value of the structure is good low-frequency broadband sound absorption performance, the thickness of the structure is 52mm at the moment, the sound absorption peak value corresponds to 1/53 of the sound wave wavelength of the perfect sound absorption frequency, and the structure has a deep sub-wavelength property;
the distance between the two sound absorption peak values of the embodiment 3 is very close, so that a sound absorption coefficient curve forms a platform area for perfect sound absorption, the sound absorption coefficients of the structure are all larger than 0.99 in the frequency range of 605-697 Hz, perfect sound absorption in the frequency band width of 82Hz is realized, excellent low-frequency width perfect sound absorption capability is realized, the thickness of the structure is 31mm at the moment, the structure corresponds to 1/80 of the wavelength of sound wave of perfect sound absorption frequency, and the structure has deep sub-wavelength property;
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 (10)

1. The utility model provides a damping inside lining level honeycomb perforated plate sound absorbing structure under water which 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 gluing, the lower surface of the lower panel is fixed on underwater equipment needing acoustic treatment, the hierarchical honeycomb layer core comprises central honeycomb resonant cavity units and node honeycomb resonant cavity units, and a node honeycomb is arranged at a node of each central honeycomb; small holes are periodically formed in the perforated upper panel, and each small hole corresponds to each central honeycomb resonant cavity unit and each 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 underwater sound absorbing structure of the damping lining layer honeycomb perforated plate according to claim 1, wherein: the perforated upper panel is made of structural steel.
3. The underwater sound absorbing structure of the damping lining layer honeycomb perforated plate according to 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 absorbing structure of the damping lining layer honeycomb perforated plate according to claim 1, wherein: the thickness of the upper plate of the perforation is 1-3 mm.
5. The underwater sound absorbing structure of the damping lining layer honeycomb perforated plate according to claim 1, wherein: the hierarchical honeycomb layer core is made of structural steel and is in the shape of a square hierarchical honeycomb, a triangular hierarchical honeycomb, a hexagonal hierarchical honeycomb or a multi-size multi-shape hybrid hierarchical honeycomb.
6. The underwater sound absorbing structure of the damping lining layer honeycomb perforated plate according to claim 1, wherein: the side length of the central honeycomb of the hierarchical honeycomb layer core is 15-45 mm.
7. The underwater sound absorbing structure of the damping lining layer honeycomb perforated plate according to claim 1, wherein: the side length of the honeycomb of the hierarchical honeycomb layer core node is 6-20 mm.
8. The underwater sound absorbing structure of the damping lining layer honeycomb perforated plate according to claim 1, wherein: the thickness of the layered honeycomb layer core is 30-60 mm.
9. The underwater sound absorbing structure of the damping lining layer honeycomb perforated plate according to claim 1, wherein: the damping inner liner layer be viscoelastic material and make, adopt rubber or polyurethane, the thickness of central authorities' honeycomb damping inner liner layer is 2~4mm, the thickness of node honeycomb damping inner liner layer is 1~5 mm.
10. The underwater sound absorbing structure of the damping lining layer honeycomb perforated plate according to claim 1, wherein: the lower panel is made of structural steel.
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