CN111696502B - Underwater sound absorption metamaterial structure with damping lining and double-layer honeycomb perforated plate - Google Patents

Underwater sound absorption metamaterial structure with damping lining and double-layer honeycomb perforated plate Download PDF

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CN111696502B
CN111696502B CN202010486466.2A CN202010486466A CN111696502B CN 111696502 B CN111696502 B CN 111696502B CN 202010486466 A CN202010486466 A CN 202010486466A CN 111696502 B CN111696502 B CN 111696502B
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honeycomb
layer
sound absorption
core
damping lining
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CN111696502A (en
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辛锋先
卢天健
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
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • 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
    • B32B15/043—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 metal
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer 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
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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
    • G10K11/172—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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T70/00—Maritime or waterways transport
    • Y02T70/10—Measures concerning design or construction of watercraft hulls

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention discloses a damping lining double-layer honeycomb perforated plate underwater sound absorption metamaterial structure 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.

Description

Underwater sound absorption metamaterial structure with damping lining and double-layer honeycomb perforated plate
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 unconventional 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 having different geometric parameters.
But in water acoustics, metamaterials relying on viscous energy dissipation of air would no longer be suitable due to the approximate incompressibility and relatively small viscosity of water. Furthermore, the wavelength of sound waves in water is more than 4 times 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 perforated upper plate is 1.5-3.5 mm.
Specifically, the thickness of the first layer honeycomb layer core is 25-40 mm, the inner edge length of each honeycomb in the first layer honeycomb layer core is 25-40 mm, and the honeycomb shape comprises hexagonal honeycomb, circular honeycomb, triangular honeycomb, square honeycomb or multi-size multi-shape hybrid honeycomb.
Furthermore, the thickness of the second damping lining layer 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.
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 inner side length of each honeycomb in the second layer honeycomb layer core is 25-40 mm, and the honeycomb shape comprises hexagonal honeycomb, circular honeycomb, triangular honeycomb, square honeycomb or multi-size 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, the damping lining layers are adhered to the side walls and the bottom surfaces of the 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 light honeycomb sandwich plate structure reduces the structure weight on the premise of realizing good low-frequency underwater sound absorption performance, and 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.
Specifically, the perforated diameter of the upper panel is 2.5-4 mm, the shape is circular, triangular, square, petal-shaped or irregular, the diameter of the perforated inner water column is determined by the diameter of the perforated hole, the Helmholtz resonance characteristic of the structure can be changed by adjusting the diameter of the perforated hole, and therefore the sound absorption performance of the structure is adjusted.
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 hole on one hand, controls the resonance sound absorption characteristic of the structure, and can adjust the bearing performance of the structure on the other hand.
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 many shapes of hexagonal honeycomb or multisize form's mixed honeycomb, 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 resonance cavity has been decided to the thickness of honeycomb layer core, change the sound absorption frequency band that the structure can be adjusted to honeycomb layer core thickness.
Further, the thickness of the first damping lining layer is 1-3 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 first damping lining layer is made of rubber or polyurethane and other visco-elastic materials, the first damping lining layer is pasted on the side wall of each honeycomb resonant cavity unit of the first 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.
Furthermore, the diameter of the second hole is 1.5-3 mm, the shape is circular, triangular, square, petal-shaped or irregular, the diameter of the water column in the perforation is determined by the diameter of the perforation, the Helmholtz resonance characteristic of the structure can be changed by adjusting the diameter of the perforation, and therefore the sound absorption performance of the structure is adjusted.
Furthermore, the thickness of the interlayer perforated panel is 1-3 mm, and the thickness of the interlayer perforated panel determines the height of a water column in a perforated hole on one hand, controls the resonance sound absorption characteristic of the structure, and can adjust the bearing performance of the structure on the other hand.
Further, the length is 25~40mm in the second floor 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, 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 sizes, 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 resonance frequency, increase the sound absorption bandwidth of structure.
Furthermore, the thickness of the second layer of 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 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 damping lining layer is made of rubber or polyurethane and other viscous elastic materials, the second 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 graphical representation of the sound absorption coefficient within 0 to 500Hz for 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 the damping lining double-layer honeycomb perforated plate comprises a perforated upper panel 1, a first honeycomb layer core 2, a first damping lining layer 3, an interlayer perforated panel 4, a second honeycomb layer core 5, a second damping lining layer 6 and a lower panel 7, wherein the perforated upper panel 1, the first honeycomb layer core 2, the interlayer perforated panel 4, the second honeycomb layer core 5 and the lower panel 7 are sequentially connected in a welding or gluing mode from top to bottom, a plurality of honeycomb resonant cavities are arranged in the first honeycomb layer core 2 and the second honeycomb layer core 5, a first damping lining layer 3 is adhered to the side wall of each honeycomb unit of the first honeycomb layer core 2, and a second damping lining layer 6 is adhered to the side wall of each honeycomb resonant cavity of the second honeycomb layer core 5, so that the underwater sound absorption metamaterial with the damping lining double-layer honeycomb perforated plate is formed.
The perforated upper panel 1 is made of structural steel, the thickness of the perforated upper panel 1 is 1.5-3.5 mm, first holes are periodically formed in the perforated upper panel 1, the diameter of each first hole is 2.5-4 mm, and each hole corresponds to one honeycomb resonant cavity unit in the first-layer honeycomb layer core structure 2.
Preferably, the shape of the first hole is not limited to a circle, a triangle, a square, a petal shape or an irregular shape.
The first layer of honeycomb layer core 2 is made of structural steel, the inner side length of each honeycomb in the first layer of honeycomb layer core 2 is 25-40 mm, and the thickness is 25-40 mm.
Preferably, the honeycomb shape of the first-layer honeycomb layer core 2 is not limited to a hexagonal honeycomb, a circular honeycomb, a triangular honeycomb, a square honeycomb, or a multi-size multi-shape hybrid honeycomb.
The second layer of damping lining layer 3 is adhered to the side wall of each honeycomb resonant cavity unit of the first layer of honeycomb layer core 2, and the thickness of the second layer of damping lining layer 3 is 1-3 mm.
Preferably, the material of the second damping liner layer 3 is not limited to rubber, polyurethane, or other viscoelastic material.
The sandwich perforated panel 4 is made of structural steel, the thickness of the sandwich perforated panel 4 is 1-3 mm, second holes are periodically formed in the sandwich perforated panel 4, the diameter of each second hole is 1.5-3 mm, and each second hole corresponds to one honeycomb resonant cavity unit in the second-layer honeycomb layer core structure 5.
Preferably, the shape of the second hole is not limited to a circle, a triangle, a square, a petal shape or an irregular shape.
The second layer honeycomb layer core 5 is made of structural steel, the inner side length of each honeycomb in the second layer honeycomb layer core 5 is 25-40 mm, and the thickness of the second layer honeycomb layer core 5 is 20-35 mm.
Preferably, the honeycomb shape in the second honeycomb layer core 5 is not limited to hexagonal honeycomb, but circular honeycomb, triangular honeycomb, square honeycomb, or multi-size multi-shape hybrid honeycomb may be used.
The second layer of damping lining layer 6 is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit of the second layer of honeycomb layer core 5, and the thickness of the second layer of damping lining layer 6 is 2-4 mm.
Preferably, the material of the second damping liner layer 6 is not limited to rubber, polyurethane, or other viscoelastic material.
The lower panel 7 is made of structural steel, and the lower surface 7 is fixed on underwater equipment needing acoustic treatment.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The sound absorption performance of the invention is mainly determined by a honeycomb resonant cavity and comprises the perforated diameter of the perforated upper panel, the thickness of the perforated upper panel, the height of the first honeycomb layer core, the inner edge length of the first honeycomb layer, the thickness of the first damping lining layer, the perforated diameter of the sandwich perforated panel, the thickness of the sandwich perforated panel, the height of the second honeycomb layer core, the inner edge length of the second honeycomb layer and the thickness of the second damping lining layer. 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.
Materials for examples:
structural steel: it is characterized in that the density is 7850kg/m 3 Young's modulus was 200GPa, and Poisson's ratio was 0.3.
Rubber: it is characterized by a density of 1100kg/m 3 Young's modulus is 10MPa, poisson's ratio is 0.49, and equivalent isotropic loss factor is 0.3.
Water: it is characterized by a density of 1000kg/m 3 The sound velocity is 1500m/s, and the dynamic viscosity coefficient is 0.00101Pa · s.
Structural dimensions and material selection of the examples:
example 1
The perforation diameter of perforation top panel is 2.5mm, the thickness of perforation top panel is 2.5mm, the height of first layer honeycomb layer core is 25mm, the interior limit length of first layer honeycomb is 25mm, the thickness of first layer damping inner liner layer is 3mm, the perforation diameter of intermediate layer perforation panel is 1.5mm, the thickness of intermediate layer perforation panel is 1mm, the interior limit length of second layer honeycomb layer core is 25mm, the height of second layer honeycomb layer core is 25mm, the thickness of second layer damping inner liner layer is 2mm.
Example 2
The perforation diameter of perforation top panel is 4mm, the thickness of perforation top panel is 1.5mm, the height of first layer honeycomb layer core is 35mm, the interior limit length of first layer honeycomb is 35mm, the thickness of first layer damping inner liner layer is 2mm, the perforation diameter 2mm of the perforation panel of intermediate layer, the thickness of intermediate layer perforation panel is 2mm, the interior limit length of second layer honeycomb is 35mm, the height 35mm of second layer honeycomb layer core, the thickness of second layer damping inner liner layer is 3mm.
Example 3
The perforation diameter of perforation top panel is 3mm, the thickness of perforation top panel is 3.5mm, the height 40mm of first layer honeycomb layer core, the interior limit length of first layer honeycomb is 40mm, the thickness of first layer damping inner liner layer is 1mm, the perforation diameter of intermediate layer perforation panel is 3mm, the thickness of intermediate layer perforation panel is 3mm, the interior limit length of second layer honeycomb is 40mm, the height of second layer honeycomb layer core is 20mm, the thickness of second layer damping inner liner layer is 4mm.
Referring to fig. 2, the helmholtz resonance phenomenon at low frequencies can achieve perfect sound absorption in a certain frequency range. The damping lining layer is adhered to the inner wall of the honeycomb resonant cavity, so that the acoustic impedance characteristic of the structure is improved, the rubber layer provides extra acoustic resistance and acoustic capacity, and Helmholtz-like resonance is formed, so that underwater low-frequency perfect sound absorption is realized. In addition, through the design of the double-layer series 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, example 1 has two sound absorption peak values at 126Hz and 368Hz, respectively, wherein the first sound absorption peak value is 0.99, which is a perfect sound absorption peak value, the second sound absorption peak value is 0.98, which is a quasi-perfect sound absorption peak value, and the structure thickness is 53.5mm, which is 1/222 of the perfect sound absorption wavelength, so example 1 is a bimodal sound absorption metamaterial with deep sub-wavelength thickness;
example 2 has two sound absorption peaks at 96Hz and 322Hz, respectively, where the first sound absorption peak is 0.99, which is a perfect sound absorption peak, and the second sound absorption peak is 0.66, where the structure thickness is 73.5mm, which is 1/212 of the perfect sound absorption wavelength, thus example 2 is a bimodal sound absorption metamaterial with deep sub-wavelength thickness;
example 3 has two sound absorption peaks at 113Hz and 208Hz, respectively, where the first sound absorption peak is 1, which is a perfect sound absorption peak, and the second sound absorption peak is 0.97, which is a quasi-perfect sound absorption peak, where the structure thickness is 66.5mm, which is 1/200 of the perfect sound absorption wavelength, so example 2 is a bimodal sound absorption metamaterial with deep sub-wavelength thickness;
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.
In summary, the technical effects achieved by the present invention are specifically as follows:
1. has excellent low-frequency sound absorption performance. The test piece has two sound absorption peak values within the range of 0-500 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 1/222-1/200 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 honeycomb core and the lower panel of the honeycomb sandwich structure jointly form a light honeycomb sandwich plate structure, and the structure has good pressure resistance and bending resistance and is a multifunctional structure with bearing and light weight.
3. With more adjustable parameters and variables. The perforated upper panel perforation diameter, the perforated upper panel thickness, the first honeycomb layer core height, the first honeycomb inner side length, the first damping lining layer thickness, the interlayer perforated panel perforation diameter, the interlayer perforated panel thickness, the second honeycomb layer core height, the second honeycomb inner side length, the second damping lining layer thickness and the like in the invention are adjustable parameters, and can be selected and adjusted reasonably according to specific use scenes, such as the requirement on the bearing performance or the requirement on the acoustic performance.
4. Simple structure and easy manufacture.
The above contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention should not be limited thereby, and any modification made on the basis of the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims (8)

1. The underwater sound absorption metamaterial structure 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 the perforated upper panel (1) is 1.5 to 3.5mm in thickness, the first honeycomb layer core (2) is 25 to 40mm in thickness, the second damping lining layer (3) is 1 to 3mm in thickness, the interlayer perforated panel (4) is 1 to 3mm in thickness, the second honeycomb layer core (5) is 20 to 35mm in thickness, the second damping lining layer (6) is 2 to 4mm in thickness, a plurality of honeycomb resonant cavities are arranged in the first honeycomb layer core (2) and the second honeycomb layer core (5), the inner side length of each honeycomb resonant cavity in the first layer core (2) is 25 to 40mm, the inner side length of each honeycomb resonant cavity in the second layer core (2) is 2 to 4mm, the diameter of each perforated upper panel (1.5) of the second honeycomb layer core (5) is 25.5 mm, and the diameter of each honeycomb resonant cavity in the inner side length of each honeycomb resonant cavity is 1.5 mm; 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 double-layer honeycomb perforated plate as claimed in claim 1, wherein the shape of the first holes 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 double-layer honeycomb perforated plate as claimed in claim 1, wherein the honeycomb shape of the first honeycomb layer core (2) comprises hexagonal honeycomb, circular honeycomb, triangular honeycomb, square honeycomb or multi-size multi-shape hybrid honeycomb.
4. The underwater sound absorption metamaterial structure with the damping lining and the double-layer honeycomb perforated plate as claimed in claim 1, wherein the second layer of damping lining layer is adhered to the side wall of each honeycomb resonant cavity unit of the first layer of honeycomb core (2).
5. The underwater sound absorption metamaterial structure with the damping lining double-layer honeycomb perforated plate as claimed in claim 1, wherein the shape of the second holes comprises a circle, a triangle, a square, a petal shape or an irregular shape.
6. The underwater sound absorption metamaterial structure with the damping lining double-layer honeycomb perforated plate according to claim 1, wherein the honeycomb shape of the second honeycomb layer core (5) comprises hexagonal honeycomb, circular honeycomb, triangular honeycomb, square honeycomb or multi-size multi-shape hybrid honeycomb.
7. The underwater sound absorption metamaterial structure with the damping lining double-layer honeycomb perforated plates as claimed in claim 1 or 6, wherein the underwater sound absorption metamaterial structure is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit of the second-layer honeycomb core (5).
8. 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.
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