CN111739500B - Perforated sandwich plate underwater broadband sound absorption structure decorated by damping layer - Google Patents

Perforated sandwich plate underwater broadband sound absorption structure decorated by damping layer Download PDF

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Publication number
CN111739500B
CN111739500B CN202010484686.1A CN202010484686A CN111739500B CN 111739500 B CN111739500 B CN 111739500B CN 202010484686 A CN202010484686 A CN 202010484686A CN 111739500 B CN111739500 B CN 111739500B
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honeycomb
sound absorption
damping layer
perforated
upper panel
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CN111739500A (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)
  • Laminated Bodies (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention provides a perforated sandwich plate underwater broadband sound absorption structure decorated 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 cementing to form four honeycomb resonant cavity units, and the damping layer is adhered on the side wall and the bottom surface 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 arranging the structures in an array, sound absorption structures with any size can be obtained so as to adapt to different application environments. The light honeycomb sandwich plate structure reduces the weight of the structure and ensures the bearing performance of the structure on the premise of realizing good low-frequency broadband underwater sound absorption performance. Furthermore, the perforated upper panel is made of structural steel, and four small holes are formed in the perforated upper panel, so that the structure has good bearing performance due to the application of the structural steel.

Description

Perforated sandwich plate underwater broadband sound absorption structure decorated by damping layer
Technical Field
The invention relates to the field of underwater sound absorption, in particular to a perforated sandwich plate underwater broadband sound absorption structure modified by a damping layer.
Background
The acoustic metamaterial is an artificial periodic composite structure and has unusual acoustic characteristics different from natural materials, such as acoustic focusing, negative refraction, unidirectional transmission, acoustic stealth and the like. In addition, the efficient absorption of low frequency sound waves by deep sub-wavelength scale structures is also one of the important special properties of acoustic metamaterials. In aeroacoustics, efficient absorption based on the helmholtz resonance principle can be achieved by structural design of spatial winding or hierarchical perforation. By parallel connection of multiple cells with different geometric parameters, some of these structures also exhibit broadband absorption capability. In hydroacoustics, however, metamaterials that rely on viscous energy dissipation of air will no longer be suitable due to the near incompressibility and relatively small viscosity of water. Furthermore, at the same frequency, the acoustic wave length in water is 4 times or more that of air, which makes it more difficult to achieve complete absorption of low frequencies by a small-sized structure. The traditional underwater sound absorption materials/structures, such as sound absorption covering layers with cavities which are periodically arranged, local resonance type phonon crystals, impedance gradual change type sound absorption covering layers and other materials/structures, have the characteristics that most of matrixes are rubber or polyurethane, are required to be adhered to a steel shell of underwater equipment in actual working, increase the structural weight on one hand, have poor bearing performance on the other hand, and are easy to deform under the action of deep water load, so that the sound absorption performance of the underwater sound absorption materials/structures is weakened. In a comprehensive view, the structure generally has the problems of poor low-frequency broadband sound absorption performance, heavier quality and poor bearing performance.
Disclosure of Invention
The invention provides a perforated sandwich plate underwater broadband sound absorption structure modified by a damping layer, which aims to solve 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:
a perforated sandwich panel underwater broadband sound absorption structure modified by a damping layer comprises four honeycomb cavity cells, and sound absorption structures with any size can be obtained by arranging the structure in an array mode so as to be convenient for adapting to different application environments. 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 cementing, and the damping layer is adhered to the side wall and the bottom surface of each honeycomb resonant cavity unit to form a 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 on the side walls and the bottom surface 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 arranging the structures in an array, sound absorption structures with any size can be obtained so as to adapt to different application environments. The light honeycomb sandwich plate structure reduces the weight of the structure and ensures the bearing performance of the structure on the premise of realizing good low-frequency broadband underwater sound absorption performance. Furthermore, the perforated upper panel is made of structural steel, and four small holes are formed in the perforated upper panel, so that the structure has good bearing performance due to the application of the structural steel.
Further, each small hole on the perforated upper panel corresponds to a honeycomb resonant cavity unit in the honeycomb layer core structure, the arrangement of the perforations enables the inside of the honeycomb unit to be communicated with the outside, and water flows into the inside of the honeycomb unit through the perforations to form a Helmholtz resonant cavity.
Further, the diameter of the perforation is 2-8 mm, the shape is circular, triangular, square, petal-shaped or irregular, the diameter of the perforation determines the diameter of a water column in the perforation, and the Helmholtz resonance characteristic of the structure can be changed by adjusting the diameter of the perforation, so that the sound absorption performance of the structure is adjusted.
Furthermore, the thickness of the perforated upper panel is 2-5 mm, the height of the water column in the perforation is determined by the thickness of the upper panel, the resonance sound absorption characteristic of the structure is controlled, and the bearing performance of the structure can be adjusted.
Specifically, the honeycomb layer core is made of structural steel, and is square honeycomb, round honeycomb, triangular honeycomb, hexagonal honeycomb or multi-size multi-shape hybrid honeycomb, and the honeycomb layer core is used for bearing compression load.
Further, the length of the inner side of the honeycomb is 30-50 mm, the honeycomb cavity is used as a Helmholtz resonant cavity, the effect of sound volume is achieved, and the peak sound absorption frequency of the structure can be controlled by adjusting the length of the inner side of the honeycomb.
Further, the thickness of the honeycomb layer core is 30 mm-40 mm, the size of the resonant 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 rubber or polyurethane and other viscoelastic materials 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 additional acoustic resistance and acoustic capacity for the honeycomb resonant cavity, so that the impedance characteristic of the structure is improved, and the low-frequency broadband underwater sound absorption of the structure is realized.
Further, the thickness of the damping layer is 1 mm-5 mm, the thickness of the damping layer determines the size of the additionally increased acoustic resistance and acoustic capacity, the acoustic impedance characteristic of the structure can be influenced, and the excellent sound absorption effect of specific frequency can be achieved through reasonable design.
The invention has the beneficial effects that:
1. has excellent low-frequency broadband sound absorption performance. 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 semi-sound absorption bandwidth can reach more than 1000Hz in the target frequency range. The sound absorption peak value of part of the frequency bands can reach more than 0.9, so that high-efficiency sound absorption is realized.
2. Has good bearing performance and light weight performance. The perforated upper panel, the honeycomb layer core and the lower panel form a light honeycomb sandwich panel structure together, and the structure has good pressure resistance and bending resistance and is a bearing and light multifunctional structure.
3. With more adjustable parameters and variables. The diameter of the perforation, the thickness of the perforated upper panel, the height of the honeycomb layer core, the inner side length of the honeycomb, the thickness of the damping layer and the like are all adjustable parameters, and can be selected and adjusted reasonably according to specific use scenes, such as requirements on bearing performance or acoustic performance.
4. Simple structure and easy manufacture.
Drawings
FIG. 1 is a schematic view of a perforated sandwich panel underwater broadband sound absorption structure modified by a damping layer according to the present invention;
fig. 2 is a schematic diagram of sound absorption coefficients within 0-2000 hz according to three embodiments of the present invention.
Wherein: 1. perforating the upper panel; 2. a honeycomb layer core; 3. a damping layer; 4. and a lower panel.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention provides a perforated sandwich plate underwater broadband sound absorption structure decorated 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 cementing to form four honeycomb resonant cavity units, and the damping layer 3 is adhered on the side wall and the bottom surface 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 arranging the structures in an array, sound absorption structures with any size can be obtained so as to adapt to different application environments. The light honeycomb sandwich plate structure reduces the weight of the structure on the premise of realizing good low-frequency broadband underwater sound absorption performance, ensures the bearing performance of the structure, 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 invention provides a perforated sandwich panel underwater broadband sound absorption structure modified by a damping layer, which comprises: the 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 a perforated sandwich plate underwater broadband sound absorption structure decorated 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, holes are formed in the perforated upper panel periodically, each hole in the perforated upper panel 1 corresponds to a honeycomb resonant cavity unit in the honeycomb layer core structure, the diameter of the 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 in the perforated upper panel 1 is not limited to circular, triangular, square, petal-shaped or irregular small holes.
The honeycomb layer core 2 is made of structural steel, the inner side length of the honeycomb is 30-50 mm, and the thickness of the honeycomb layer core 2 is 30-40 mm. In addition to this, the shape of the honeycomb layer core 2 is not limited to square honeycomb, circular honeycomb, triangular honeycomb, hexagonal honeycomb or multi-sized and multi-shaped hybrid honeycomb.
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 a viscoelastic material such as rubber or polyurethane.
The lower panel 4 is made of structural steel and the lower surface 4 is fixed to underwater equipment requiring acoustic treatment.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The sound absorption performance of the invention is mainly determined by a honeycomb resonant cavity, and the sound absorption performance comprises a perforation diameter, a perforation upper panel thickness, a honeycomb layer core height, a honeycomb inner side length and a damping layer thickness. The load bearing and lightweight properties are mainly determined by the face sheets and the honeycomb layer core, including the thickness of the perforated upper face sheet, the height of the honeycomb layer core, the inner side length of the honeycomb, etc. Because these structural parameters are all adjustable parameters, can realize corresponding sound absorption, bear and lightweight performance requirement through adjusting. The technical scheme of the invention is exemplified by the following specific examples.
Examples materials:
structural steel: it is characterized by a density of 7850kg/m 3 Young's modulus 200GPa, poisson's ratio 0.3.
Rubber: it is characterized by density of 1100kg/m 3 Young's modulus 10MPa, poisson's ratio 0.49, and equivalent isotropy loss factor 0.3.
Water: it is characterized by density of 1000kg/m 3 The sound velocity is 1500m/s, and the dynamic viscosity coefficient is 0.00101 Pa.s.
The structural dimensions and material selection of the embodiments:
example 1
The thickness of the perforated upper panel is 3mm, the inner side length of the honeycomb is 30mm, the height of the honeycomb layer core is 30mm, the perforation diameter of the cavity 1 is 2mm, the thickness of the damping layer is 5mm, the perforation diameter of the cavity 2 is 5mm, the thickness of the damping layer is 1.7mm, the perforation diameter of the cavity 3 is 3.3mm, the thickness of the damping layer is 5mm, the perforation diameter of the cavity 4 is 5mm, and the thickness of the damping layer is 4mm.
Example 2
The thickness of the perforated upper panel is 5mm, the inner side length of the honeycomb is 40mm, the height of the honeycomb layer core is 40mm, the perforation diameter of the cavity 1 is 5mm, the thickness of the damping layer is 2.7mm, the perforation diameter of the cavity 2 is 3.4mm, the thickness of the damping layer is 5mm, the perforation diameter of the cavity 3 is 2.7mm, the thickness of the damping layer is 5mm, the perforation diameter of the cavity 4 is 5mm, and the thickness of the damping layer is 5mm.
Example 3
The thickness of the perforated upper panel is 2mm, the inner side length of the honeycomb is 50mm, the height of the honeycomb layer core is 35mm, the perforation diameter of the cavity 1 is 8mm, the thickness of the damping layer is 4.4mm, the perforation diameter of the cavity 2 is 8mm, the thickness of the damping layer is 1.8mm, the perforation diameter of the cavity 3 is 8mm, the thickness of the damping layer is 1mm, the perforation diameter of the cavity 4 is 5.2mm, and the thickness of the damping layer is 5mm.
Referring to fig. 2, the helmholtz resonance phenomenon at low frequencies can achieve efficient sound absorption in a certain frequency range. By sticking the damping layer on the inner wall of the honeycomb resonant cavity, the acoustic impedance characteristic of the structure is improved, and the rubber layer provides additional acoustic resistance and acoustic capacity, so that Helmholtz-like resonance is formed, and the underwater low-frequency high-efficiency sound absorption is realized. In addition, through the interval arrangement of the two diameters of perforations, a plurality of resonance frequencies are obtained, and a plurality of sound absorption peaks are generated, so that the invention realizes the excellent sound absorption effect of the low-frequency broadband.
Referring to fig. 2, the sound absorption coefficient of embodiment 1 in the 390Hz frequency band between 293 Hz and 683Hz is greater than 0.8, and the sound absorption performance is high, the semi-sound absorption band is 240 Hz to 765Hz, and the semi-sound absorption bandwidth is 525Hz. The sound absorption coefficient of the structure has 4 sound absorption peaks which respectively occur at 303Hz, 399Hz, 528Hz and 630Hz and respectively correspond to the resonance sound absorption frequencies of 4 cavity cells;
in the embodiment 2, the sound absorption coefficient in the frequency band range of 848Hz between 422 and 1270Hz is larger than 0.8, the sound absorption performance is high, the semi-sound absorption band is 350-1417 Hz, and the semi-sound absorption band width is 1067Hz. The sound absorption coefficient of the structure has 4 sound absorption peaks which respectively occur at 458Hz, 644Hz, 893Hz and 1161Hz and respectively correspond to the resonance sound absorption frequencies of 4 cavity cells;
in the embodiment 3, the sound absorption coefficient in the frequency band range of 804Hz between 550 Hz and 1354Hz is larger than 0.8, the sound absorption performance is high, the semi-sound absorption band is 466 Hz to 1476Hz, and the semi-sound absorption band width is 1010Hz. The sound absorption coefficient of the structure has 4 sound absorption peaks which respectively occur at 642Hz, 808Hz, 1079Hz and 1269Hz and respectively correspond to the resonance sound absorption frequencies 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 larger 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 a part of frequency bands can reach more than 0.9, the underwater sound wave can be efficiently absorbed, and the acoustic performance can be adjusted through the design of different structural parameters.
The present invention has been described in terms of the preferred embodiments thereof, and it should be understood by those skilled in the art that various modifications can be made without departing from the principles of the invention, and such modifications should also be considered as being within the scope of the invention.

Claims (5)

1. The utility model provides a perforation sandwich panel underwater broadband sound absorption structure of damping layer modification which characterized in that: each honeycomb cavity cell comprises a perforated upper panel, a honeycomb layer core, a damping layer and a lower panel, wherein the perforated upper panel, the honeycomb layer core and the lower panel are connected through welding or cementing, each perforation on the perforated upper panel corresponds to one honeycomb resonant cavity unit in the 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 a perforated sandwich plate underwater broadband sound absorption structure modified by the damping layer; the diameter of the perforation of the perforated upper panel is 2-8 mm, the thickness of the perforated upper panel is 2-5 mm, the inner side length of each honeycomb in the honeycomb layer core is 30-50 mm, the thickness of the honeycomb layer core is 30-40 mm, the damping layer is made of a viscoelastic material and is made of rubber or polyurethane, and the thickness of the damping layer is 1-5 mm.
2. The damping layer modified perforated sandwich panel underwater broadband sound absorption structure of claim 1, wherein: the perforated upper panel is made of structural steel, and 4 perforations are formed in the perforated upper panel.
3. The damping layer modified perforated sandwich panel underwater broadband sound absorption structure of claim 1, wherein: the perforation shape is round, triangle, square, petal shape or irregular shape.
4. The damping layer modified perforated sandwich panel underwater broadband sound absorption structure of claim 1, wherein: the honeycomb layer core is made of structural steel and is square honeycomb, round honeycomb, triangular honeycomb, hexagonal honeycomb or multi-size multi-shape hybrid honeycomb.
5. The damping layer modified perforated sandwich panel underwater broadband sound absorption structure of claim 1, wherein: the lower panel is made of structural steel.
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