CN111739500A - Underwater broadband sound absorption structure of perforated sandwich plate modified by damping layer - Google Patents

Underwater broadband sound absorption structure of perforated sandwich plate modified by damping layer Download PDF

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Publication number
CN111739500A
CN111739500A CN202010484686.1A CN202010484686A CN111739500A CN 111739500 A CN111739500 A CN 111739500A CN 202010484686 A CN202010484686 A CN 202010484686A CN 111739500 A CN111739500 A CN 111739500A
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honeycomb
damping layer
perforated
sound absorption
sandwich plate
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CN111739500B (en
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卢天健
辛锋先
段明宇
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 non-planar shape
    • 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 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
    • G10K11/162—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
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention provides a perforated sandwich plate underwater broadband sound absorption structure modified by a damping layer, which is characterized in that an upper panel, a honeycomb layer core and a lower panel are perforated by welding or gluing to form four honeycomb resonant cavity units, and the damping layers are adhered to the side walls and the bottom surfaces of the honeycomb resonant cavity units, so that the acoustic impedance characteristic of the structure is improved, and the low-frequency broadband sound absorption performance of the structure is improved. By arraying the structures, a sound absorbing structure of any size can be obtained so as to adapt to different application environments. The light honeycomb sandwich plate structure reduces the structure weight and ensures the structure bearing performance on the premise of realizing good low-frequency broadband underwater sound absorption performance. Furthermore, the perforated upper panel is made of structural steel, four small holes are formed in the perforated upper panel, and the structure has good bearing performance due to the application of the structural steel.

Description

Underwater broadband sound absorption structure of perforated sandwich plate modified by damping layer
Technical Field
The invention relates to the field of underwater sound absorption, in particular to an underwater broadband sound absorption structure of a perforated sandwich plate modified by a damping layer.
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 efficient absorption of low-frequency sound waves by the deep sub-wavelength scale structure is also one of important special properties of the acoustic metamaterial. In aeroacoustics, efficient absorption based on the helmholtz resonance principle can be achieved by a structural design of space winding or hierarchical perforation. Some of these structures also exhibit broadband absorption capability through the parallel connection of multiple elements with different geometric parameters. But in water acoustics, metamaterials relying on viscous energy dissipation of air would no longer be suitable due to the near incompressibility and relatively small viscosity of water. Furthermore, the wavelength of sound waves in water is 4 times or more that of air at the same frequency, which makes it more difficult to achieve complete absorption of low frequencies by a small-sized structure. In the traditional underwater sound absorption material/structure, for example, materials/structures such as a sound absorption covering layer with periodically arranged cavities, a local resonance type phononic crystal, an impedance gradual change type sound absorption covering layer and the like, most of matrixes of the traditional underwater sound absorption material/structure are made of rubber or polyurethane, and the traditional underwater sound absorption material/structure needs to be adhered to a steel shell of underwater equipment during actual work, so that the structural weight is increased, the bearing performance is poor, and the traditional underwater sound absorption material/structure is easy to deform under the action of deep water load, so that the sound absorption performance is weakened. In summary, the above structure generally has the problems of poor low-frequency broadband sound absorption performance, heavier mass and poor bearing performance.
Disclosure of Invention
The invention provides an underwater broadband sound absorption structure of a perforated sandwich plate modified by a damping layer, aiming at solving the problems of poor low-frequency broadband 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 perforation sandwich panel underwater broadband sound absorbing structure that damping layer was decorated, includes four honeycomb cavity cells, through carrying out the array with this structure, can obtain the sound absorbing structure of arbitrary size to in adapt to different application environment. Each cell comprises a perforated upper panel, a honeycomb layer core, a damping layer and a lower panel, the perforated upper panel, the honeycomb layer core and the lower panel are connected through welding or gluing, and the damping layer is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit to form the perforated sandwich plate underwater broadband sound absorption structure decorated by the damping layer.
According to the invention, the upper panel, the honeycomb layer core and the lower panel are perforated by welding or gluing to form four honeycomb resonant cavity units, and the damping layers are adhered to the side walls and the bottom surfaces of the honeycomb resonant cavity units, so that the acoustic impedance characteristic of the structure is improved, and the low-frequency broadband sound absorption performance of the structure is improved. By arraying the structures, a sound absorbing structure of any size can be obtained so as to adapt to different application environments. The light honeycomb sandwich plate structure reduces the structure weight and ensures the structure bearing performance on the premise of realizing good low-frequency broadband underwater sound absorption performance. Furthermore, the perforated upper panel is made of structural steel, four small holes are formed in the perforated upper panel, and the structure has good bearing performance due to the application of the structural steel.
Furthermore, each small hole on the perforated upper panel corresponds to one honeycomb resonant cavity unit in the honeycomb layer core structure, the arrangement of the perforations enables the inside of each honeycomb unit to be communicated with the outside, and water flows into the inside of each honeycomb unit through the perforations to form a Helmholtz resonant cavity.
Further, the diameter of perforation is 2~8mm, and the shape is circular, triangle-shaped, square, petal shape or irregular shape, and the diameter of perforation interior water column has been decided to the diameter of perforation, can change the helmholtz resonance characteristic of structure through adjusting the perforation diameter to adjust the sound absorption performance of structure.
Furthermore, the thickness of the upper panel of the through hole is 2-5 mm, and the thickness of the upper panel determines the height of a water column in the through hole on one hand, controls the resonance sound absorption characteristic of the structure, and can adjust the bearing performance of the structure on the other hand.
Specifically, honeycomb layer core is made by the structural steel, and the shape is square honeycomb, circular honeycomb, triangle-shaped honeycomb, hexagonal honeycomb or the mixed honeycomb of many shapes of many sizes, and honeycomb layer core is used for bearing compressive load, and in addition, honeycomb wall divides the structure into a plurality of units, can realize the differentiation size design of different units, forms a plurality of resonant frequency, increases the sound absorption bandwidth of structure.
Further, the length is 30~50mm in the honeycomb, and the honeycomb cavity has played the effect of sound volume as helmholtz resonant cavity, through the length in the adjustment honeycomb, can control the peak value sound absorption frequency of structure.
Furthermore, the thickness of the honeycomb layer core is 30 mm-40 mm, the size of the resonance cavity is determined by the thickness of the honeycomb layer core, and the sound absorption frequency band of the structure can be adjusted by changing the thickness of the honeycomb layer core.
Specifically, the damping layer is made of viscoelastic materials such as rubber or polyurethane and is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit, and the adhesion of the damping 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 broadband underwater sound absorption of the structure is facilitated.
Furthermore, the thickness of the damping layer is 1 mm-5 mm, the thickness of the damping layer determines the size of extra added acoustic resistance and acoustic capacitance, the acoustic impedance characteristic of the structure can be influenced, and the excellent sound absorption effect of specific frequency can be realized through reasonable design.
The invention has the beneficial effects that:
1. has excellent low-frequency broadband sound absorption performance. In the target frequency range, the sound absorption coefficient of the test piece can reach more than 0.8, the sound absorption bandwidth can reach more than 800Hz, and the half sound absorption bandwidth can reach more than 1000 Hz. The sound absorption peak value of partial frequency band can reach more than 0.9, thus realizing high-efficiency sound absorption.
2. Has good bearing performance and light weight performance. The perforated upper panel, the honeycomb core and the lower panel of the honeycomb sandwich structure jointly form a light honeycomb sandwich plate structure, and the structure has good pressure resistance and bending resistance and is a multifunctional structure with bearing and light weight.
3. With more adjustable parameters and variables. The diameter of the through hole, the thickness of the upper panel of the through hole, the height of the honeycomb layer core, the inner side length of the honeycomb, the thickness of the damping layer and the like 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.
Drawings
FIG. 1 is a schematic view of an underwater broadband sound absorption structure of a perforated sandwich plate modified by a damping layer according to the invention;
FIG. 2 is a schematic diagram of sound absorption coefficients within 0-2000 Hz of three embodiments of the present invention.
Wherein: 1. perforating the upper panel; 2. a honeycomb layer core; 3. a damping 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 a perforated sandwich plate underwater broadband sound absorption structure modified by a damping layer, which is characterized in that an upper panel 1, a honeycomb layer core 2 and a lower panel 4 are perforated by welding or gluing to form four honeycomb resonant cavity units, and the damping layers 3 are adhered to the side walls and the bottom surfaces of the honeycomb resonant cavity units, so that the acoustic impedance characteristic of the structure is improved, and the low-frequency broadband sound absorption performance of the structure is improved. By arraying the structures, a sound absorbing structure of any size can be obtained so as to adapt to different application environments. On the premise of realizing good low-frequency broadband 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 broadband 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 broadband sound absorption structure with a perforated sandwich plate modified by a damping layer, comprising: the underwater broadband sound absorption structure comprises a perforated upper panel 1, a honeycomb layer core 2, a damping layer 3 and a lower panel 4, wherein the perforated upper panel 1, the honeycomb layer core 2 and the lower panel 4 are connected through welding or gluing, the damping layer 3 is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit, and the underwater broadband sound absorption structure of the perforated sandwich plate modified by the damping layer is formed, and the structural schematic diagram is shown in figure 1.
The perforated upper panel 1 is made of structural steel, small holes are periodically formed in the perforated upper panel, each small hole in the perforated upper panel 1 corresponds to one honeycomb resonant cavity unit in the honeycomb layer core structure, the diameter of each perforation is 2-8 mm, and the thickness of the perforated upper panel 1 is 2-5 mm. In addition, the shape of the small holes on the perforated upper panel 1 is not limited to circular, triangular, square, petal-shaped or irregular.
Honeycomb layer core 2 is made by the structural steel, and the length is 30~50mm in the honeycomb, and honeycomb layer core 2's thickness is 30mm ~40 mm. In addition to this, the shape of the honeycomb layer core 2 is not limited to a square honeycomb, but a circular honeycomb, a triangular honeycomb, a hexagonal honeycomb, or a multi-size multi-shape hybrid honeycomb may be used.
And the damping layer 3 is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit, and the thickness of the damping layer 3 is 1 mm-5 mm. In addition, the material of the damping layer 3 is not limited to rubber, and viscoelastic materials such as polyurethane may be used.
The lower panel 4 is made of structural steel and the lower surface 4 is fixed to the underwater equipment to be acoustically treated.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The sound absorption performance of the invention is mainly determined by a honeycomb resonant cavity, and the sound absorption performance of the invention is determined by the diameter of a perforation, the thickness of a perforated upper panel, the height of a honeycomb core, the length of the inner side of a honeycomb and the thickness of a damping layer. The bearing and light weight performance is mainly determined by the panel and the honeycomb layer core, including the thickness of the panel on the perforation, the height of the honeycomb layer core, the inner length of the honeycomb and the like. Because the structural parameters are adjustable parameters, the corresponding performance requirements of sound absorption, bearing and light weight can be realized through adjustment. The technical solution of the present invention is exemplarily illustrated by the following specific examples.
Materials for examples:
structural steel: it is characterized by a density of 7850kg/m3Young's modulus 200GPa and Poisson's ratio 0.3.
Rubber: it is characterized by a density of 1100kg/m3Young's modulus 10MPa, Poisson's ratio 0.49, and equivalent isotropic loss factor 0.3.
Water: it is characterized by a density of 1000kg/m3The sound velocity is 1500m/s, and the dynamic viscosity coefficient is 0.00101 pas.
Structural dimensions and material selection of the examples:
example 1
The punch upper panel thickness is 3mm, the honeycomb inner side length is 30mm, the honeycomb layer core height is 30mm, the 1 punch diameter of cavity is 2mm, the damping layer thickness is 5mm, the 2 punch diameters of cavity are 5mm, the damping layer thickness is 1.7mm, the 3 punch diameters of cavity are 3.3mm, the damping layer thickness is 5mm, the 4 punch diameters of cavity are 5mm, the damping layer thickness is 4 mm.
Example 2
The punch upper panel thickness is 5mm, the honeycomb inner side length is 40mm, the honeycomb layer core height is 40mm, the punch diameter of the cavity 1 is 5mm, the damping layer thickness is 2.7mm, the punch diameter of the cavity 2 is 3.4mm, the damping layer thickness is 5mm, the punch diameter of the cavity 3 is 2.7mm, the damping layer thickness is 5mm, the punch diameter of the cavity 4 is 5mm, and the damping layer thickness is 5 mm.
Example 3
Punch the top panel thickness 2mm, the length 50mm in the honeycomb, honeycomb layer core height 35mm, 1 perforation diameter of cavity is 8mm, damping layer thickness is 4.4mm, 2 perforation diameters of cavity are 8mm, damping layer thickness is 1.8mm, 3 perforation diameters of cavity are 8mm, damping layer thickness is 1mm, 4 perforation diameters of cavity are 5.2mm, damping layer thickness is 5 mm.
Referring to fig. 2, the helmholtz resonance phenomenon at low frequency can achieve high sound absorption in a certain frequency range. The damping 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 high-efficiency sound absorption is realized. In addition, through the interval arrangement of the through holes with two diameters, a plurality of resonance frequencies are obtained, a plurality of sound absorption peak values are generated, and therefore the excellent sound absorption effect of a low-frequency broadband is achieved.
Referring to fig. 2, in the embodiment 1, the sound absorption coefficient is greater than 0.8 in the frequency band range of 390Hz between 293 to 683Hz, and the sound absorption performance is high, the half sound absorption band is 240 to 765Hz, and the half sound absorption bandwidth is 525 Hz. The sound absorption coefficient of the structure has 4 sound absorption peak values which respectively occur at 303Hz, 399Hz, 528Hz and 630Hz and respectively correspond to the resonance sound absorption frequency of 4 cavity cells;
in the embodiment 2, the sound absorption coefficient in the frequency band range of 848Hz between 422 Hz and 1270Hz is more than 0.8, and the sound absorption performance is high, wherein the half sound absorption band is 350 Hz to 1417Hz, and the half sound absorption bandwidth is 1067 Hz. The sound absorption coefficient of the structure has 4 sound absorption peak values which respectively occur at 458Hz, 644Hz, 893Hz and 1161Hz and respectively correspond to the resonance sound absorption frequency of 4 cavity cells;
the sound absorption coefficient of the embodiment 3 in the frequency band range of 804Hz between 550 Hz and 1354Hz is larger than 0.8, the high-efficiency sound absorption performance is achieved, the half sound absorption band is 466 Hz to 1476Hz, and the half sound absorption bandwidth is 1010 Hz. The sound absorption coefficient of the structure has 4 sound absorption peak values which respectively occur at 642Hz, 808Hz, 1079Hz and 1269Hz and respectively correspond to the resonance sound absorption frequency of 4 cavity cells; the sound absorption coefficient curve shows that the invention can realize excellent low-frequency broadband sound absorption performance in a certain frequency range, the sound absorption coefficient is stably more than 0.8 in a target frequency range, the sound absorption bandwidth can reach more than 800Hz, and the half sound absorption bandwidth can reach more than 1000 Hz. The sound absorption peak value of partial frequency band can reach more than 0.9, can realize high-efficient absorption to the sound wave under water to design through different structural parameters can realize the regulation to acoustic performance.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (9)

1. The utility model provides a perforation sandwich panel underwater broadband sound absorption structure that damping layer was decorated which characterized in that: the honeycomb cavity type sound absorption structure comprises a plurality of honeycomb cavity cells distributed in an array mode, wherein each cell comprises a perforated upper panel, a honeycomb layer core, a damping layer and a lower panel, the perforated upper panel, the honeycomb layer core and the lower panel are connected through welding or gluing, each perforated hole in the perforated upper panel corresponds to one honeycomb resonant cavity unit in a honeycomb layer core structure, the damping layer is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit, and the lower panel is fixed on underwater equipment needing acoustic treatment to form the perforated sandwich plate underwater broadband sound absorption structure modified by the damping layer.
2. The damping layer modified perforated sandwich plate underwater broadband sound absorbing structure according to claim 1, wherein: the perforated upper panel is made of structural steel and is provided with 4 perforations.
3. The damping layer modified perforated sandwich plate underwater broadband sound absorbing structure according to claim 1, wherein: the diameter of the perforation of the upper panel of the perforation is 2-8 mm, and the perforation is in a circular shape, a triangular shape, a square shape, a petal shape or an irregular shape.
4. The damping layer modified perforated sandwich plate underwater broadband sound absorbing structure according to claim 1, wherein: the upper plate of the perforation has a thickness of 2-5 mm.
5. The damping layer modified perforated sandwich plate underwater broadband sound absorbing structure according to claim 1, wherein: the honeycomb layer core is made of structural steel and is in a shape of a square honeycomb, a circular honeycomb, a triangular honeycomb, a hexagonal honeycomb or a multi-size and multi-shape hybrid honeycomb.
6. The damping layer modified perforated sandwich plate underwater broadband sound absorbing structure according to claim 1, wherein: the honeycomb layer core in every honeycomb interior side length be 30~50 mm.
7. The damping layer modified perforated sandwich plate underwater broadband sound absorbing structure according to claim 1, wherein: the thickness of the honeycomb layer core is 30 mm-40 mm.
8. The damping layer modified perforated sandwich plate underwater broadband sound absorbing structure according to claim 1, wherein: the damping layer is made of a viscoelastic material, rubber or polyurethane is adopted, and the thickness of the damping layer is 1 mm-5 mm.
9. The damping layer modified perforated sandwich plate underwater broadband sound absorbing structure according to claim 1, wherein: the lower panel is made of structural steel.
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