CN113823252B - Petal-shaped channel-rubber composite underwater sound absorption structure - Google Patents
Petal-shaped channel-rubber composite underwater sound absorption structure Download PDFInfo
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 83
- 229920001971 elastomer Polymers 0.000 title claims abstract description 83
- 239000002131 composite material Substances 0.000 title claims abstract description 38
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 6
- 239000004917 carbon fiber Substances 0.000 claims description 6
- 239000003365 glass fiber Substances 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 239000003190 viscoelastic substance Substances 0.000 abstract description 30
- 239000000463 material Substances 0.000 abstract description 15
- 238000013461 design Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 6
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- 238000000034 method Methods 0.000 description 4
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- 238000004364 calculation method Methods 0.000 description 2
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- 230000030279 gene silencing Effects 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
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- 229920000642 polymer Polymers 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
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- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T70/00—Maritime or waterways transport
- Y02T70/10—Measures concerning design or construction of watercraft hulls
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- Physics & Mathematics (AREA)
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- Acoustics & Sound (AREA)
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
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Abstract
The invention provides a petal-shaped channel-rubber composite underwater sound absorption structure which comprises a bottom plate, wherein a plurality of petal-shaped channels are formed in the surface of the bottom plate, rubber is filled into the petal-shaped channels, a petal-shaped channel-rubber composite structure is formed between the rubber and the petal-shaped channels, the rubber forms a homogeneous rubber layer on the upper surface of the petal-shaped channels, and an air layer is reserved between the rubber and the bottom of the bottom plate. The invention can greatly improve the sound absorption performance of the viscoelastic material. The design has more adjustable parameters including structural parameters and material parameters, and can be correspondingly adjusted according to the actual working condition requirements. Simple structure and easy manufacture.
Description
Technical Field
The invention relates to the technical field of underwater sound absorption composite structures, in particular to a petal-shaped channel-rubber composite underwater sound absorption structure.
Background
Only sound waves can propagate in long distances under water, so that the method is widely applied to underwater information transmission and reconnaissance. As a typical anti-reconnaissance method, the silencing tile is mainly used for covering a submarine shell, absorbing sound wave energy emitted by an enemy active sonar, reducing the sound reflection intensity, reducing the detectable range and achieving the purpose of stealth. Viscoelastic materials, such as rubber and polyurethane, are often used as the base material for the sound absorbing layer due to their acoustic impedance matching with the water. The sound absorption mechanism is that incident sound waves cause the polymer chains within the viscoelastic material to vibrate and friction within the molecules consumes acoustic energy. However, absorption of low frequency sound remains a significant challenge due to the inherently weak dissipation of viscoelastic materials in the low frequency domain. In addition, the low-frequency sound wave in water has longer wavelength, and the only way to effectively attenuate the low-frequency sound absorption by using the original uniform viscoelastic material is to increase the thickness of the material, which contradicts the actual situation. The main solution is that a cavity resonance structural sound absorption layer such as an Alberich sound absorption layer, namely a cavity with various shapes is embedded inside. When the frequency of the incident sound wave approaches the natural frequency of the cavity, the vibration of the polymer chains is exacerbated and the sound energy is severely dissipated by intramolecular friction. However, the sound absorption bandwidth of the resonance silencing structure is narrow, and the cavity is sensitive to water pressure, so that the actual requirement of deep sea conditions cannot be met. So there is still a challenge in designing underwater broadband sound absorbing structures and water pressure resistant sound absorbing structures.
Disclosure of Invention
The invention provides a petal-shaped channel-rubber composite underwater sound absorption structure for solving the problems in the prior art, improves the underwater sound absorption performance of sound absorption rubber through reasonable design of the structure, and solves the problem that the broadband sound absorption performance of a viscoelastic material is poor.
The invention comprises a bottom plate, wherein a plurality of petal-shaped channels are formed on the surface of the bottom plate, rubber is filled into the petal-shaped channels, a petal-shaped channel-rubber composite structure is formed between the rubber and the petal-shaped channels, a homogeneous rubber layer is formed on the upper surface of the petal-shaped channels by the rubber, and an air layer is reserved between the rubber and the bottom of the bottom plate; the petal-shaped channel is determined by a function r (x), and is calculated as follows: r (x) =r1-2 εcos (nx), where r is the reference aperture, ε is the relative roughness, n is the spatial wavenumber, x is the non-dimensionalized coordinates in the axial direction, the reference aperture r is 9-35 mm, the roughness ε is 0-0.1, and the spatial wavenumber n is 0-10.
The wall surface of the petal-shaped channel is made of metal materials or carbon fiber/glass fiber composite materials so as to ensure enough rigidity and acoustic impedance difference with rubber.
Further, the petal-shaped channels are formed by perforating uniform materials, and the height is 10-50 mm.
Furthermore, the petal-shaped channels are distributed in a square or hexagonal close-packed mode, and the distribution period is 10-36 mm.
Furthermore, the petal-shaped channels are filled with a viscoelastic material such as rubber, not limited to rubber, and the density is 800-1400 kg/m 3 。
Specifically, the sound velocity of the transverse wave of the rubber is 500-2000 m/s, and the loss factor of the transverse wave is 0.01-0.3; the sound velocity of longitudinal wave is 30-300 m/s, and the loss factor of longitudinal wave is more than 0.5.
Further, an air layer is arranged between the rubber and the bottom plate, and the thickness is 1-10 mm.
Further, the upper surface of the petal-shaped channel-rubber composite underwater sound absorption structure is covered with a layer of uniform rubber, and the thickness of the uniform rubber layer is 1-10 mm.
Further, the thickness of the petal-shaped channel-rubber composite layer is 20-50 mm.
Further, the overall thickness of the petal-shaped channel-rubber composite underwater sound absorption structure is 30-60 mm.
Further, the sound absorption coefficient of the petal-shaped channel-rubber composite underwater sound absorption structure is greater than 0.8 at 900-10000Hz, and the average sound absorption coefficient is greater than 0.85.
The invention relates to a petal-shaped channel-rubber composite underwater sound absorption structure, wherein viscoelastic underwater sound absorption materials such as rubber and the like are filled in the petal-shaped channel. Since the petal-shaped channel wall surface is connected with the bottom plate and has high rigidity, it is assumed that the channel wall surface does not vibrate due to disturbance of sound waves. The viscoelastic material vibrates under the excitation of sound waves, and the viscoelastic material close to the wall surface is restrained from vibrating due to the existence of the petal-shaped channel wall surface, and the material far away from the wall surface vibrates relatively violently, so that a strong shearing effect is generated in the viscoelastic material. Since the shear loss of the viscoelastic material is much greater than the compression loss, the acoustic loss capability of the viscoelastic material can be greatly improved. On the other hand, an air layer is arranged between the rubber and the bottom plate, the air layer releases the bottom constraint, the vibration of the rubber is enhanced, and the acoustic wave loss capacity of the viscoelastic material is further improved. On the other hand, the petal-shaped channel design can increase the area of the connecting surface of the wall surface and the rubber, and increase the cheek of the energy loss, so that the energy loss is further improved. On the other hand, the petal-shaped channel wall surface is connected with the bottom plate, and pressure is transmitted to the bottom surface through the wall surface, so that the structure has certain bearing capacity, and the water pressure resistance of the structure is further improved.
Furthermore, a margin of 1-5 mm is reserved between the size of the cellular unit and the petal-shaped channel, so that the rigidity of the partition plate can be ensured to ensure that the wall surface of the petal-shaped channel does not vibrate along with the viscoelastic material.
Further, the width of the cells is selected in relation to the parameters of the viscoelastic material, and the two are matched with each other so as to realize good sound absorption performance.
Further, the density of the rubber is 800-1400 kg/m 3 Playing a major role in sound absorption in the structure.
Further, the viscoelastic material has a transverse wave loss factor of 0.5 or more to ensure sufficient viscous action between the viscoelastic material and the wall surface, and sufficient loss capacity for acoustic wave energy.
Furthermore, in order to ensure the mismatch of acoustic impedance between the petal-shaped channel wall surface and the viscoelastic material and have a certain bearing capacity, the petal-shaped channel wall surface can be selected from metal such as steel, aluminum and the like or composite materials such as carbon fiber and glass fiber and the like.
Further, in order to ensure that the structure has sufficient sound absorption capacity, the total thickness of the petal-shaped channel-rubber composite underwater sound absorption structure is 20-60 mm.
Further, in order to improve vibration of rubber in the petal-shaped channel-rubber composite underwater sound absorption structure, an air layer is embedded between the rubber and the bottom plate, and the thickness of the air layer is 1-10 mm.
The invention has the beneficial effects that:
1. the simulation calculation results of the invention are that the sound absorption coefficient is above 0.8 at 900-10000Hz, the average sound absorption coefficient is above 0.9, and the requirement of effective sound absorption in a wide frequency band is satisfied;
2. the petal channel has simple structure, simple mixing process with rubber and convenient processing;
3. the mechanical property of the whole structure can be changed by changing the petal channel structure parameters and the material parameters, so that the requirements of different occasions are met.
4. The upper rubber layer effectively protects the petal-shaped channel structure from seawater corrosion, keeps the surface smooth, and effectively reduces the surface resistance.
In summary, the petal-shaped channel-rubber composite underwater sound absorption structure can greatly improve the sound absorption performance of the viscoelastic material. The design has more adjustable parameters including structural parameters and material parameters, and can be correspondingly adjusted according to the actual working condition requirements. Simple structure and easy manufacture.
Drawings
Fig. 1 is a schematic view of an underwater sound absorption structure of the present invention.
Fig. 2 (a) is a top view of a petal-shaped channel.
Fig. 2 (b) is a hexagonal close-up top view.
Fig. 2 (c) is a hexagonal close-up front view.
Fig. 3 (a) is a schematic view of the sound absorption coefficient of the first embodiment of the underwater sound absorption structure of the present invention.
Fig. 3 (b) is a schematic view of the sound absorption coefficient of the second embodiment of the underwater sound absorption structure of the present invention.
Fig. 3 (c) is a schematic view of sound absorption coefficients of a third embodiment of the underwater sound absorption structure of the present invention.
Fig. 4 is a schematic diagram showing the shape of petals of a petal-shaped channel as a function of the spatial wavenumber n and the relative roughness epsilon.
Wherein: 1. rubber; 2. a petal-shaped channel; 3. and an air layer.
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.
Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the accompanying drawings. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
The invention provides a petal-shaped channel-rubber composite underwater sound absorption structure, which is formed by flowering a petal-shaped channel on a metal or carbon fiber/glass fiber composite material, and filling a viscoelastic material such as rubber into the petal-shaped channel for solidification. The rubber bottom is provided with an air layer which promotes rubber vibration. The upper surface of the structure is covered with a pure rubber covering layer to protect the petal-shaped channel from being corroded by seawater. Compared with the viscoelastic material with the same thickness, the structure finally formed has greatly improved sound absorption performance, and the sound absorption coefficient is more than 0.8 in a very wide frequency band range. The formed structure has the property of difficult deformation under hydrostatic pressure, so that the underwater sound absorption structure with the effects of resisting hydrostatic pressure and absorbing sound in a broadband mode is realized.
Referring to fig. 1 and 2, the present invention relates to a petal-shaped channel-rubber composite underwater sound absorption structure, which comprises rubber 1, a petal-shaped channel 2 and an air layer 3, wherein the petal-shaped channel 2 is formed by perforating a metal or carbon fiber/glass fiber composite material. In addition, the air layer is arranged at the bottom of the rubber, so that the sound absorption performance is improved. The upper surface of the structure is covered with a pure rubber covering layer, which plays a role in protecting the petal-shaped channel from seawater erosion. In the constructed petal-shaped channel-rubber composite underwater sound absorption structure, the wall surface of the petal-shaped channel 2 plays a role in improving the sound absorption performance of the viscoelastic material and transmitting loads such as water pressure, and the viscoelastic material 1 is used as a sound absorption material for absorbing sound wave energy.
Wherein the width a of each cell (namely the distance between the center points of two adjacent petal holes) is 10-30 mm.
The density of the viscoelastic material 1 is 800-1400 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The sound velocity of transverse waves is 500-2000 m/s, and the loss factor of transverse waves is 0.01-0.3; the sound velocity of longitudinal wave is 30-300 m/s, and the loss factor of longitudinal wave is above 0.5.
The wall surface of the petal-shaped channel 2 is made of metal materials such as iron and aluminum or carbon fiber/glass fiber composite materials, and the thinnest part of the wall surface is more than 0.5mm in order to ensure certain bearing capacity, weight and other requirements.
The petal-shaped channels 2 are determined by a function r (x), calculated as follows: r (x) =r [1-2 εcos (nx) ]. Wherein r is a reference aperture, epsilon is relative roughness, n is spatial wave number, and x is a dimensionless coordinate in the axial direction. Specifically, the reference pore diameter r is 9-35 mm, the relative roughness epsilon is 0-0.1, and the spatial wave number n is 0-10. Furthermore, the petal-shaped channels are distributed in a square or hexagonal close-packed mode, and the distribution period is 10-36 mm. The shape of the petals of the petal-shaped channel varies with the number of spatial waves n and the relative roughness epsilon, as shown in figure 4.
The air layer 3 is air with the thickness of 1-10 mm.
The overall thickness of the underwater sound absorption structure is 30-60 mm.
The petal-shaped channel-rubber composite underwater sound absorption structure can achieve good sound absorption effect between 900 and 10000Hz, and compared with the viscoelastic material with the same thickness, the sound absorption performance is greatly improved. The reason is that steel has a much higher modulus than rubber, and steel plates can be seen as rigid with respect to rubber. The sound waves cause rubber vibration, and the vibration of the connecting position with the wall surface of the petal-shaped channel is limited, so that a strong shearing action is generated near the wall surface, and the sound wave energy is lost. The bottom air layer releases the constraint of the bottom to the vibration of the rubber, and increases the vibration of the rubber, thereby effectively improving the sound absorption performance of the low-frequency stage structure. In addition, the structure also meets the requirement of maintaining the sound absorption performance under high hydrostatic pressure and not easy to be reduced; simple structure and strong operability.
Example 1
Metal steel: the density is 7850kg/m3, young's modulus is 2.05GPa, and Poisson's ratio is 0.28.
Viscoelastic material 1: it is characterized by density of 1000kg/m 3 The longitudinal wave velocity is 1000m/s, the longitudinal wave loss factor is 0.3, the transverse wave velocity is 100m/s, and the transverse wave loss factor is 0.9.
Water: it is characterized by density of 1000kg/m 3 The sound velocity is 1500m/s.
Air: it is characterized by a density of 1.29kg/m 3 The sound velocity is 340m/s.
Structural dimensions of the examples:
cell size: a=25 mm. Radius: r=12 mm. Spatial wave number: n=9. Relative roughness: epsilon=0.02. Thickness of air layer: h is a 1 =2mm. Petal-shaped channel-rubber mixing layer thickness: h is a 2 =45 mm. The thickness of the upper pure rubber cover layer is as follows: h is a 3 ＝1mm。
Example 2
Examples materials:
metal steel: the density is 7850kg/m3, young's modulus is 2.05GPa, and Poisson's ratio is 0.28.
Viscoelastic material 2: it is characterized by density of 1000kg/m 3 The longitudinal wave speed is 900m/s, the longitudinal wave loss factor is 0.2, the transverse wave speed is 100m/s, and the transverse wave loss factor is 0.9.
Water: it is characterized by density of 1000kg/m 3 The sound velocity is 1500m/s.
Air: it is characterized by a density of 1.29kg/m 3 The sound velocity is 340m/s.
Structural dimensions of the examples:
petal-shaped channel cell size: a=31 mm. Radius: r=15 mm. Spatial wave number: n=8. Relative roughness: epsilon=0.03. Thickness of air layer: h is a 1 =3mm. Petal-shaped channel rubber mixing layer thickness: h is a 2 =4mm. The thickness of the upper pure rubber cover layer is as follows: h is a 3 ＝1mm。
Example 3
Examples materials:
metal steel: the density is 7850kg/m3, young's modulus is 2.05GPa, and Poisson's ratio is 0.28.
Viscoelastic material 3: it is characterized by density of 900kg/m 3 The longitudinal wave speed is 1200m/s, the longitudinal wave loss factor is 0.3, the transverse wave speed is 80m/s, and the transverse wave loss factor is 0.9.
Water: it is characterized by density of 1000kg/m 3 The sound velocity is 1500m/s.
Air: it is characterized by a density of 1.29kg/m 3 The sound velocity is 340m/s.
Structural dimensions of the examples:
petal-shaped channel cell size: a=25 mm. Radius: r=12 mm. Spatial wave number: n=5. Relative roughness: epsilon=0.03. Thickness of air layer: h is a 1 =2mm. Petal-shaped channel rubber mixing layer thickness: h is a 2 =55mm. The thickness of the upper pure rubber cover layer is as follows: h is a 3 ＝2mm。
Comparative example 1 is a uniform rubber material of the same thickness as the examples, comparative example 2 is a circular channel-rubber composite underwater sound absorption structure, and the total thickness remains the same. In addition, the examples show tetragonal arrangement and hexagonal close-packed structure, respectively. To ensure objectivity of the control, the material parameters were consistent with the examples.
Theoretical calculations and numerical simulations were performed using the above materials and structural dimensions, giving the following comparisons of the sound absorption coefficients of the examples and comparative examples:
and calculating the sound absorption coefficients of the two structures between 0 and 10000Hz and the uniform comparison group.
Referring to fig. 3 (a-c), wherein the black dotted line represents the sound absorption coefficient of the uniform viscoelastic material of equal thickness, the black dot line represents the sound absorption coefficient of the circular channel-rubber composite underwater sound absorption structure, the black dot line represents the sound absorption coefficient of the tetragonally arranged petal-shaped channel-rubber composite underwater sound absorption structure, and the black solid line represents the sound absorption coefficient of the hexagonal close-packed petal-shaped channel-rubber composite underwater sound absorption structure. As can be seen from the figure, compared with the viscoelastic material with equal thickness, the sound absorption structure provided by the invention has great improvement in 0-10000 Hz. The concrete steps are as follows:
the sound absorption coefficient of the embodiment 1 reaches more than 0.8 at 900-10000Hz, and the average sound absorption coefficient in the whole frequency range reaches more than 0.85. The petal-shaped channels have a 10% improvement in sound absorption coefficient at 1800Hz over circular channels.
The sound absorption coefficient of the embodiment 2 is above 0.8 at 600-2000 Hz, and the average sound absorption coefficient in the whole frequency range is above 0.8. The petal-shaped channels have 8% improvement in sound absorption coefficient at 1000Hz relative to the circular channels.
The sound absorption coefficient of the embodiment 3 is more than 0.8 in 600-1800 Hz and 5000-10000 Hz, and the average sound absorption coefficient in the whole frequency range is more than 0.75. The petal-shaped channels have a 5% increase in sound absorption coefficient at 1000Hz relative to the circular channels.
The result shows that the sound absorption performance in a wide frequency range can be greatly improved by controlling the size and the thickness of the petal-shaped channel and selecting rubber materials with different physical parameters in the parameter value range. Of these, the sound absorption bandwidth was the widest and the average sound absorption coefficient was the best with example 1.
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. A petal-shaped channel-rubber composite underwater sound absorption structure is characterized in that: the rubber-rubber composite structure comprises a bottom plate, wherein a plurality of petal-shaped channels are formed on the surface of the bottom plate, rubber is filled into the petal-shaped channels, a petal-shaped channel-rubber composite structure is formed between the rubber and the petal-shaped channels, a homogeneous rubber layer is formed on the upper surface of the petal-shaped channels, and an air layer is reserved between the rubber and the bottom of the bottom plate; the petal-shaped channel consists of functionsr(x) The determination is calculated as follows:whereinrAs the reference aperture is to be used,εin order for the relative roughness to be the same,nfor the number of waves in space,xto be in an axial dimensionless coordinate, baseQuasi-aperturerIs 9-35 mm, for roughnessε0 to 0.1, spatial wavenumbern0 to 10.
2. The petal-shaped channel-rubber composite underwater sound absorption structure according to claim 1, wherein: the height of the petal-shaped channel is 10-50 mm, the thickness of the air layer is 1-10 mm, the thickness of the petal-shaped channel-rubber composite structure is 20-50 mm, and the thickness of the uniform rubber layer is 1-10 mm.
3. The petal-shaped channel-rubber composite underwater sound absorption structure according to claim 1, wherein: the petal-shaped channels are distributed in a square or hexagonal close-packed mode, and the distribution period is 10-36 mm.
4. The petal-shaped channel-rubber composite underwater sound absorption structure according to claim 1, wherein: the density of the rubber is 800-1400 kg/m 3 The sound velocity of longitudinal waves is 500-2000 m/s, and the loss factor of the longitudinal waves is 0.01-0.3; the sound velocity of transverse waves is 30-300 m/s, and the loss factor of the transverse waves is more than 0.5.
5. The petal-shaped channel-rubber composite underwater sound absorption structure according to claim 1, wherein: the wall surface of the petal-shaped channel is made of metal materials or carbon fiber/glass fiber composite materials.
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| CN111696504A (en) * | 2020-06-01 | 2020-09-22 | 西安交通大学 | Petal-shaped inner insertion tube type underwater Helmholtz resonance cavity structure |
| CN112071295A (en) * | 2020-09-07 | 2020-12-11 | 西安交通大学 | Baffle is filled viscoelastic material and is inhaled sound structure under water |
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2021
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| JPH08160965A (en) * | 1994-12-08 | 1996-06-21 | Tech Res & Dev Inst Of Japan Def Agency | Sound absorbing and shielding material |
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| KR20070048000A (en) * | 2005-11-03 | 2007-05-08 | 현대중공업 주식회사 | Laminating structure of absorber for noise control of low frequency sound field |
| CN109763577A (en) * | 2019-01-21 | 2019-05-17 | 南京航空航天大学 | A kind of porous plate acoustic adsorption device with rough surface modification micropore |
| CN111696504A (en) * | 2020-06-01 | 2020-09-22 | 西安交通大学 | Petal-shaped inner insertion tube type underwater Helmholtz resonance cavity structure |
| CN112071295A (en) * | 2020-09-07 | 2020-12-11 | 西安交通大学 | Baffle is filled viscoelastic material and is inhaled sound structure under water |
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