CN112829387A - Sound-absorbing tile attached to outer surface of underwater vehicle shell and underwater vehicle - Google Patents

Sound-absorbing tile attached to outer surface of underwater vehicle shell and underwater vehicle Download PDF

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Publication number
CN112829387A
CN112829387A CN202110217206.XA CN202110217206A CN112829387A CN 112829387 A CN112829387 A CN 112829387A CN 202110217206 A CN202110217206 A CN 202110217206A CN 112829387 A CN112829387 A CN 112829387A
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layer
cylindrical cavity
anechoic
inner material
carbon fiber
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Chinese (zh)
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王宗辉
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Rainbow UAV Technology Co Ltd
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Rainbow UAV Technology Co Ltd
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    • 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
    • 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
    • B32B25/08—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 of synthetic resin
    • 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
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • 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
    • B32B27/08—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 of synthetic resin
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B32B27/38—Layered products comprising a layer of synthetic resin comprising epoxy resins
    • 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
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
    • B63G8/28—Arrangement of offensive or defensive equipment
    • B63G8/34—Camouflage
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres
    • 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • 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
    • 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
    • B32B2605/00—Vehicles
    • B32B2605/16—Submarines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention discloses an anechoic tile attached to the outer surface of a shell of an underwater vehicle and the underwater vehicle, wherein the anechoic tile is formed by closely arranging a plurality of connected regular hexagonal prism-shaped unit cell structures, and the unit cell structures sequentially comprise the following components in the direction from the part close to the shell to the part far away from the shell: the projections of a regular hexagon formed by the outer surface profiles of the substrate layer, the sound absorption layer and the sound transmission layer in the axial direction of the regular hexagonal prism are overlapped; the sound absorption layer comprises an inner material layer and a carbon fiber skeleton wrapping the inner material layer, the carbon fiber skeleton and the outer contour of the inner material layer are both in a regular hexagon shape, and a cavity longitudinally penetrating through the inner material layer is formed in the inner material layer. The anechoic tile structure of the invention adopts the carbon fiber honeycomb as the internal skeleton, and solves the difficulty of cavity deformation of the anechoic structure under deep water. In addition, the sound absorption performance is excellent in low, medium and high full frequency bands.

Description

Sound-absorbing tile attached to outer surface of underwater vehicle shell and underwater vehicle
Technical Field
The invention belongs to the technical field of underwater sound absorption, noise reduction and stealth, and particularly relates to a noise reduction tile attached to the outer surface of a shell of an underwater vehicle and the underwater vehicle.
Background
The submarine becomes a naval vessel variety with great threat because of the stealth, and the underwater noise elimination covering layer technology is a comprehensive technology which can reduce the target intensity of the submarine, inhibit the radiation noise of the submarine and reduce the self noise of a sonar platform area. The current anechoic tile structure mainly comprises a particle filling type, an impedance transition type, a cavity resonance type and a relatively novel local resonance type. The impedance transition type often has the defects of single structural material, overlarge size and poor sound absorption effect; the cavity resonance type structure is easy to deform the inner cavity due to external pressure; the particle filling type usually depends on matching with other types of structural designs, and the preparation process of the local resonance type structure is complex and the technology is imperfect.
At present, most of researches on the structure of the anechoic tile usually stay in the middle and high frequency range, the influence of deep water pressure on the structure is not considered to be analyzed, and the sound absorption performance of the anechoic tile structure is influenced by adding an adhesive to fix all layers in the preparation process.
Therefore, a new type of anechoic tile structure is desired, which can achieve a wide-band sound absorption effect and has an excellent hydrostatic pressure resistance effect.
Disclosure of Invention
The invention aims to provide a silencing tile attached to the outer surface of a shell of an underwater vehicle and the underwater vehicle, which can realize a broadband sound absorption effect and have an excellent hydrostatic pressure resistance effect.
In order to achieve the above object, the present invention provides an anechoic tile attached to an outer surface of an underwater vehicle hull, wherein the anechoic tile is formed by closely arranging a plurality of connected regular hexagonal prism-shaped unit cell structures, and the unit cell structures sequentially comprise, from a direction close to the hull to a direction away from the hull:
the projections of a regular hexagon formed by the outer surface profiles of the substrate layer, the sound absorption layer and the sound transmission layer in the axial direction of the regular hexagonal prism are overlapped;
the sound absorption layer comprises an inner material layer and a carbon fiber skeleton wrapping the inner material layer, the carbon fiber skeleton and the outer contour of the inner material layer are both in a regular hexagon shape, and a cavity longitudinally penetrating through the inner material layer is formed in the inner material layer.
In an alternative, the cavity comprises:
a first cylindrical cavity adjacent one side of the acoustically transparent layer;
a second cylindrical cavity adjacent one side of the substrate layer;
the variable-diameter cylindrical cavity is connected between the first cylindrical cavity and the second cylindrical cavity in a transition manner;
wherein the radius of the first cylindrical cavity is smaller than the radius of the second cylindrical cavity.
In the alternative, the radius of the first cylindrical cavity is 1.5-2.5 mm; the radius of the second cylindrical cavity is 7.5-8.5 mm.
In an alternative scheme, the height of the variable-diameter cylindrical cavity is at least 3 times of the sum of the heights of the first cylindrical cavity and the second cylindrical cavity.
In an alternative scheme, the carbon fiber framework is made of two layers of carbon fiber cloth which are distributed in an orthogonal mode through high-temperature curing.
In the alternative, the thickness of the carbon fiber skeleton is 0.2-0.4 mm.
In an alternative scheme, the inner material layer is made of elastomer polyurethane, the elastomer polyurethane serves as an adhesive, and the sound transmitting layer, the sound absorbing layer and the base layer are bonded into a whole after high-temperature curing.
In an alternative scheme, the material of the sound-transmitting layer comprises epoxy resin, foamed polyurethane and glass beads; and/or the material of the substrate layer comprises glass beads and vulcanized styrene-butadiene rubber.
In the alternative, the thickness of the sound-transmitting layer is 4-6mm, the thickness of the sound-absorbing layer is 45-55mm, and the thickness of the substrate layer is 4-6 mm.
The invention also provides an underwater vehicle comprising the anechoic tile.
The invention has the beneficial effects that:
the anechoic tile structure adopts the carbon fiber honeycomb as the internal skeleton, the carbon fiber honeycomb has higher structural strength, and the difficulty of deformation of the sound absorption structure cavity under deep water is perfectly solved. When the submarine is positioned in a 300m deep water environment, the structure can still maintain the normal sound absorption effect. The invention gets rid of the limitation of a single sound absorption structure principle, integrates three structure principles of a cavity resonance type, an impedance transition type and a particle filling type, and designs the sound absorption tile with excellent sound absorption performance in low, medium and high full frequency bands. The basis of the submarine is to avoid active sonar detection of an enemy, and the submarine stealth is realized by absorbing sound waves emitted from the outside as much as possible into the anechoic tile and consuming the sound waves.
Furthermore, in the structure, extra adhesive is not doped in the preparation process, and the polyurethane material of the inner material layer is used for completing the bonding of the whole structure, so that the influence factor of the sound absorption effect is reduced to the minimum.
Furthermore, through a plurality of tests, the sound-transmitting layer, the sound-absorbing layer and the substrate layer are set to be proper in thickness, and a combined cavity structure is adopted, so that the performance of the anechoic tile is further optimized.
The present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 shows a cross-sectional view of an anechoic wattle cell structure according to an embodiment of the present invention.
Figure 2 shows a top view of an acoustical tile structure according to an embodiment of the present invention.
Fig. 3 shows a flow chart of a method for manufacturing a carbon fiber skeleton according to an embodiment of the invention.
Reference numerals
1-an acoustic transmission layer, 2-an internal material layer, 3-a substrate layer, 4-a carbon fiber framework, 5-3-a first cylindrical cavity and 5-2-a variable-diameter cylindrical cavity; 5-1-a second cylindrical cavity; 10-unit cell structure.
Detailed Description
The present invention will be described in more detail below. While the present invention provides preferred embodiments, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
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; may be mechanically coupled, may be directly coupled, or may be indirectly coupled through an intermediary. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
An embodiment of the invention provides an anechoic tile attached to the outer surface of an underwater vehicle shell, and fig. 1 shows a cross-sectional view of an anechoic tile unit cell structure of the embodiment. Fig. 2 shows a top view of the structure of the anechoic tile of the present embodiment.
Referring to fig. 1 and fig. 2, the anechoic tile is formed by closely arranging a plurality of connected regular hexagonal prism-shaped unit cell structures 10, wherein the unit cell structures 10 sequentially include, from a direction close to the shell to a direction away from the shell:
the projections of a regular hexagon formed by the outer surface profiles of the substrate layer 3, the sound absorption layer and the sound transmission layer 1 in the axis direction of the regular hexagonal prism are overlapped;
the sound absorption layer comprises an inner material layer 2 and a carbon fiber skeleton 4 wrapping the inner material layer 2, wherein the carbon fiber skeleton 4 and the outer contour of the inner material layer 2 are both in a regular hexagon shape, and the inner material layer 2 is provided with a cavity which longitudinally penetrates through the inner material layer 2.
Specifically, the anechoic tile unit cell structure comprises an upper layer of matrix structure, a middle layer of matrix structure and a lower layer of matrix structure, the outer contours of the three layers of matrix structures are regular hexagons, and the axes of the three layers of matrix structures are overlapped and vertically stacked, so that the unit cell structure forms a regular hexagonal prism shape. Wherein, the sound absorbing layer includes interior material layer 2 and parcel the carbon fiber skeleton 4 of interior material layer 2, the carbon fiber skeleton 4 of every unit cell structure is regular hexagon, and a plurality of carbon fiber skeletons 4 constitute alveolately, and carbon-fibre composite has high specific strength, and density low grade advantage has good mechanical properties.
The anechoic tile structure adopts the carbon fiber honeycomb as the internal skeleton, the carbon fiber honeycomb has higher structural strength, and the difficulty of deformation of the sound absorption structure cavity under deep water is perfectly solved. When the submarine is positioned in a 300m deep water environment, the structure can still maintain the normal sound absorption effect. The invention gets rid of the limitation of a single sound absorption structure principle, integrates three structure principles of a cavity resonance type, an impedance transition type and a particle filling type, and establishes a model with a Helmholtz resonance cavity. The anechoic tile with excellent sound absorption performance in all low, medium and high frequency bands is designed. Therefore, sonar detection is effectively avoided, self radiation noise is reduced, and the stealth function of the submarine is realized.
In this embodiment, the cavity is a combined special-shaped cavity, which is divided into three parts, including: the first cylindrical cavity 5-3 close to one side of the sound-transmitting layer 1 is close to the second cylindrical cavity 5-1 at one side of the substrate layer 3; the variable-diameter cylindrical cavity 5-2 is connected between the first cylindrical cavity 5-3 and the second cylindrical cavity 5-1 in a transition mode, wherein the radius of the first cylindrical cavity 5-3 is smaller than that of the second cylindrical cavity 5-1. The cavity structure converts the compression deformation of the material into shear deformation, simultaneously induces resonance, and has better effect on the aspect of low-frequency sound absorption
In a specific example, the radius of the first cylindrical cavity 5-3 is 1.5-2.5 mm; the radius of the second cylindrical cavity 5-1 is 7.5-8.5 mm. In another specific example, the height of the variable diameter cylindrical cavity 5-2 is at least 3 times of the sum of the heights of the first cylindrical cavity and the second cylindrical cavity, for example, the height of the first cylindrical cavity 5-3 and the height of the second cylindrical cavity 5-1 are both 5mm, and the height of the variable diameter cylindrical cavity 5-2 is 40 mm.
In this embodiment, the sound-transmitting layer 1 is in direct contact with the water environment, and it needs to have good waterproof and anticorrosive characteristics. Through the configuration of density and elastic modulus, control characteristic impedance and water phase match to guarantee that the sound wave can better enter into inside the whole anechoic tile structure. The layer in the embodiment is composed of epoxy resin, foamed polyurethane and glass beads, and has good surface air tightness and good waterproof performance.
The inner material layer 2 is made of elastomer polyurethane, the polyurethane is a viscoelastic material, and the sound absorption mechanism mainly comprises two types: firstly, the method is based on intramolecular friction caused by sound waves in the material and energy consumption mechanisms of the sound waves on different medium interfaces. Two, like the helmholtz resonator in air, the sound waves enter the cavity and are lost to resonance. Meanwhile, the method has the advantages of simple preparation process, large sound absorption frequency range, easy molecular design and the like.
The substrate layer 3 is prepared by vulcanized styrene butadiene rubber matched with glass beads, the characteristic impedance of the substrate layer is the highest of three layers, and the rubber has a good vibration damping and buffering effect, so that the substrate layer is attached to a steel plate and plays a role in impedance transition on the basis of vibration damping and noise reduction. The glass beads inside the structure act to reduce density and scatter the sound waves.
The carbon fiber framework 4 is made of two layers of carbon fiber cloth which are orthogonally distributed through high-temperature curing. The preparation method adopts a die method, and specifically comprises the following steps: referring to fig. 3, in a first step, a die is provided, which is a semi-regular hexagonal prism steel material cut along a diagonal of a cross section. And secondly, cutting two layers of carbon fiber plain cloth prepreg into narrow strips with the width of 50mm, and laying and compacting around a mold according to a mode shown in the figure. And thirdly, curing the mould group wound with the carbon fiber plain cloth prepreg for two hours at the temperature of 120 ℃ and under the atmospheric pressure of 1.5, cooling and demoulding. And fourthly, after enough corrugated strips are prepared, bonding the corrugated strips by using the special structural adhesive for the carbon fiber composite material to obtain the required carbon fiber composite material honeycomb framework structure.
The inner material layer polyurethane of the middle sound absorption layer is used as an adhesive, and the sound transmission layer, the sound absorption layer and the substrate layer are bonded into a whole through high-temperature curing. The advantage is that no new binder needs to be incorporated, affecting the sound absorption properties of the whole structure.
In one embodiment, the acoustical tile is prepared as follows: the thickness of the sound-transmitting layer 1 is 5mm, and the sound-transmitting layer is prepared by curing epoxy resin, AB type foaming polyurethane and XLD3000 glass beads in a mold at normal temperature, wherein the mass ratio of the epoxy resin: foaming polyurethane: glass beads were 10:8: 1. The thickness of the internal material layer 2 is 50mm, the radius of the upper circle of the cavity structure is 2mm, the radius of the lower cylinder is 8mm, and the heights of the upper and lower cylinder cavities are 5 mm. The elastomeric polyurethane type 1085 was injected into the mold cavity and placed in an oven and allowed to cure for 4 hours at 100 c. The carbon fiber honeycomb framework is prepared by two layers of carbon fibers at high temperature and high pressure, and the wall thickness of the framework is 0.2-0.4mm, such as 0.3 mm. The thickness of the substrate layer 3 is 5mm, and the substrate layer is formed by adding 15% of XLD3000 glass beads into styrene butadiene rubber through normal-temperature curing. After each layer is prepared, the polyurethane of the inner material layer 2 is used as an adhesive to be cured at high temperature and high pressure to be integrally formed.
In the prepared anechoic tile structure: the density of the sound-transmitting layer 1 is 560Kg/m3Modulus of elasticity of 2X 109Pa, Poisson's ratio of 0.42. The density of the inner material layer 2 is 1042Kg/m3Modulus of elasticity of 2X 108Pa, Poisson's ratio of 0.485, and loss factor of 0.6. The density of the substrate layer 3 is 1030Kg/m3Elastic modulus of 7.7X 106Pa, Poisson's ratio of 0.49, and loss factor of 0.5.
Another embodiment of the invention also provides an underwater vehicle comprising the anechoic tile.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims (10)

1. The anechoic tile attached to the outer surface of the shell of an underwater vehicle is characterized in that the anechoic tile is formed by closely arranging a plurality of connected regular hexagonal prism-shaped unit cell structures, wherein the unit cell structures sequentially comprise the following components from the direction close to the shell to the direction far away from the shell:
the projections of a regular hexagon formed by the outer surface profiles of the substrate layer, the sound absorption layer and the sound transmission layer in the axial direction of the regular hexagonal prism are overlapped;
the sound absorption layer comprises an inner material layer and a carbon fiber skeleton wrapping the inner material layer, the carbon fiber skeleton and the outer contour of the inner material layer are both in a regular hexagon shape, and a cavity longitudinally penetrating through the inner material layer is formed in the inner material layer.
2. The anechoic tile of claim 1, wherein the cavity comprises:
a first cylindrical cavity adjacent one side of the acoustically transparent layer;
a second cylindrical cavity adjacent one side of the substrate layer;
the variable-diameter cylindrical cavity is connected between the first cylindrical cavity and the second cylindrical cavity in a transition manner;
wherein the radius of the first cylindrical cavity is smaller than the radius of the second cylindrical cavity.
3. The anechoic tile according to claim 2, characterized in that said first cylindrical cavity has a radius of 1.5-2.5 mm; the radius of the second cylindrical cavity is 7.5-8.5 mm.
4. The anechoic tile according to claim 2, wherein the height of the variable diameter cylindrical cavity is at least 3 times the sum of the heights of the first cylindrical cavity and the second cylindrical cavity.
5. The anechoic tile according to claim 1, characterized in that said carbon fiber skeleton is made by high temperature curing of two layers of carbon fiber cloth, which are orthogonally distributed.
6. The anechoic tile according to claim 1, characterized in that said carbon fiber skeleton has a thickness of 0.2-0.4 mm.
7. The anechoic tile according to claim 1, wherein the material of the inner material layer is elastomer polyurethane, the elastomer polyurethane is used as an adhesive, and the sound-transmitting layer, the sound-absorbing layer and the substrate layer are bonded into a whole after being cured at high temperature.
8. The anechoic tile of claim 1, wherein the material of the acoustically transparent layer comprises epoxy, foamed polyurethane, and glass beads; and/or the material of the substrate layer comprises glass beads and vulcanized styrene-butadiene rubber.
9. The anechoic tile according to claim 1, characterized in that said acoustically transparent layer has a thickness of 4-6mm, said acoustically absorbent layer has a thickness of 45-55mm and said substrate layer has a thickness of 4-6 mm.
10. An underwater vehicle characterized in that the anechoic tiles of any one of claims 1 to 9 are attached to the outer surface of the hull of the underwater vehicle.
CN202110217206.XA 2021-02-26 2021-02-26 Sound-absorbing tile attached to outer surface of underwater vehicle shell and underwater vehicle Pending CN112829387A (en)

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