CN112185326B - Double-screw coupling underwater sound absorption super-surface structure - Google Patents
Double-screw coupling underwater sound absorption super-surface structure Download PDFInfo
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- CN112185326B CN112185326B CN202010866060.7A CN202010866060A CN112185326B CN 112185326 B CN112185326 B CN 112185326B CN 202010866060 A CN202010866060 A CN 202010866060A CN 112185326 B CN112185326 B CN 112185326B
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 74
- 230000008878 coupling Effects 0.000 title claims abstract description 52
- 238000010168 coupling process Methods 0.000 title claims abstract description 52
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 52
- 238000013016 damping Methods 0.000 claims abstract description 32
- 238000005192 partition Methods 0.000 claims abstract description 14
- 238000003466 welding Methods 0.000 claims description 5
- 230000001788 irregular Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 229910000746 Structural steel Inorganic materials 0.000 description 5
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000003190 viscoelastic substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
- G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
-
- 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
-
- 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
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Chemical & Material Sciences (AREA)
- Aviation & Aerospace Engineering (AREA)
- Combustion & Propulsion (AREA)
- Fluid Mechanics (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Building Environments (AREA)
Abstract
The invention discloses a double-screw coupling underwater sound absorption super-surface structure, which comprises a layer core, wherein a plurality of double-screw coupling units are arranged in the layer core at intervals, a cavity is arranged in the screw center of each double-screw coupling unit, a ring-shaped partition plate is arranged between the cavity and a screw channel, a screw type damping lining layer is arranged on the side wall of the screw channel, a perforated upper panel is arranged at the top of the layer core, small holes are periodically formed in the perforated upper panel corresponding to the cavity of the double-screw coupling unit, a lower panel is arranged at the bottom of the layer core, and the perforated upper panel, the layer core and the lower panel are connected to form the double-screw coupling underwater sound absorption super-surface structure. The invention has excellent low-frequency sound absorption performance and ultra-thin sub-wavelength structure size. The adjustable structure parameter is more in the aspect of design, can be correspondingly adjusted according to the actual working condition demand, and has simple structure and easy manufacture.
Description
Technical Field
The invention belongs to the technical field of acoustic super-surface, and particularly relates to a double-spiral coupling underwater sound absorption super-surface structure.
Background
With the continuous development of marine equipment, effective absorption of underwater sound waves is increasingly attracting attention. The traditional underwater sound absorption material or structure comprises pure polymer underwater sound absorption material, particle filled underwater sound absorption material, cavity resonance type underwater sound absorption material, porous underwater sound absorption material and the like, and has the advantages of larger volume, structure size close to sound wave wavelength and poor low-frequency sound absorption performance. The water sound absorption metamaterial which is emerging in recent years comprises a local resonance water sound absorption metamaterial and a non-resonance water sound absorption metamaterial.
Compared with the traditional sound absorption material, the local resonance underwater sound absorption metamaterial can reduce the sound absorption frequency by two orders of magnitude, but is limited by inherent properties of local resonance, and low-frequency sound absorption performance below 500Hz is insufficient. The non-resonant underwater sound absorption metamaterial has good broadband sound absorption capacity based on the sound attenuation and sound scattering principle, but the low-frequency sound wave absorption capacity is insufficient.
In a comprehensive view, the problems of poor low-frequency sound absorption performance and large structure thickness of the structure exist under water.
Disclosure of Invention
The invention aims to solve the technical problems of providing a double-spiral coupling underwater sound absorption super-surface structure aiming at the defects in the prior art, and solves the problems of poor low-frequency sound absorption performance and large structure thickness of the traditional underwater sound absorption structure.
The invention adopts the following technical scheme:
The utility model provides a double helix coupling is sound absorption super surface structure under water, includes double helix coupling unit, and double helix coupling unit includes a plurality ofly, adopts welding or cementing mode to set up between perforation top panel and lower panel, and the periodic of opening on the perforation top panel has the aperture, and every aperture corresponds a double helix coupling unit, constitutes a double helix coupling is sound absorption super surface structure under water, is equipped with under water through the lower panel and is connected.
Specifically, the double-screw coupling unit comprises a layer core, a screw channel is arranged in the layer core, a damping lining layer is arranged in the screw channel, a cavity is formed in the center of the layer core, one side of the cavity is connected with one end of the damping lining layer, and a ring-shaped partition plate is arranged between the cavity and the damping lining layer.
Further, the width of the spiral channel is 5-15 mm, and the height is 10-25 mm.
Further, the shape of the spiral channel comprises a square spiral, an arc spiral or a multi-size multi-shape hybrid spiral; the number of turns of the spiral channel is at least 2.
Further, the thickness of the damping lining layer is 1.5-5 mm.
Further, the thickness of the annular separator is 0.2-1 mm.
Further, the length of the cavity is 3-8 mm.
Specifically, the small holes are alternately distributed on the perforated upper panel, the diameter of the small holes is 1-5 mm, and the shapes of the small holes comprise round, triangular, square, petal-shaped or irregular shapes.
Specifically, the perforated upper panel 1 has a thickness of 0.2 to 2mm.
Specifically, the sound absorption peak value of the double-spiral coupling underwater sound absorption super-surface structure within 100-300 Hz is more than 0.99. Compared with the prior art, the invention has at least the following beneficial effects:
According to the double-spiral coupling underwater sound absorption super-surface structure, the upper panel, the layer core and the lower panel are perforated by welding or gluing to form a plurality of double-spiral coupling units, and the damping lining layers are adhered to the peripheral side walls of the spiral channels of the double-spiral coupling units to form double-spiral mutual coupling, so that the acoustic impedance characteristic of the structure is improved, and the low-frequency sound absorption performance of the structure is improved. The design of the spiral channel structure can reduce the thickness of the structure on the premise of realizing good low-frequency underwater sound absorption performance, ensures the ultra-thin characteristic of the sub-wavelength scale of the structure, and solves the problems that the traditional underwater sound absorption structure is poor in low-frequency sound absorption performance and is excessively thick in structure.
Further, the width of the spiral channel of the layer core is 5-15 mm, the height is 10-25 mm, the spiral shape comprises square spiral, circular arc spiral or multi-size multi-shape hybrid spiral, the number of spiral turns is at least 2, the spiral channel is used as a Helmholtz resonant cavity to play the role of sound volume, the width, the height and the number of turns of the spiral channel determine the size of the double-spiral coupling unit, and the peak sound absorption frequency of the structure can be adjusted by adjusting the size and the shape of the spiral channel.
Further, the thickness of the damping lining layer is 1.5-5 mm, the thickness of the damping lining 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 realized through reasonable design.
Further, the thickness of the annular partition plate is 0.2-1mm, and the cross section shape of the annular partition plate is the same as that of the damping lining layer, so that the annular partition plate is used for fixing the spiral boundary end of the damping lining layer.
Further, the length of the cavity is 3-8mm, and the cavity is used for communicating the perforation of the upper panel and the spiral channel.
Further, the perforated upper panel is provided with small holes corresponding to the double-screw coupling units in a periodical manner, the inside and the outside of the double-screw coupling units are communicated through the perforated holes, water flows into the inside of the double-screw coupling units through the perforated holes, the center of the double-screw coupling units is provided with a cavity for communicating the perforated holes of the upper panel with the screw channels, and a ring-shaped partition plate for fixing the screw boundary ends of the damping lining layers is arranged between the cavity and the screw channels.
Further, the small holes are alternately distributed on the perforated upper panel, the shape of the small holes is round, triangular, square, petal-shaped or irregular, the diameter of the small holes is 1-5 mm, and the sound absorption performance of the structure can be adjusted by adjusting the aperture and the shape of the small holes.
Furthermore, the perforated upper panel is made of structural steel and has a thickness of 0.2-2 mm, and the thickness of the perforated upper panel determines the perforated height and controls the resonance sound absorption characteristic of the structure.
Further, the damping lining layer is made of viscoelastic materials and is adhered to the side wall of the spiral channel of each double-spiral coupling unit, and the adhesion of the damping lining layer provides additional acoustic resistance and acoustic capacity for the spiral channel, so that the impedance characteristic of the structure is improved, and the low-frequency underwater sound absorption of the structure is facilitated.
In summary, the invention has excellent low frequency sound absorption performance and deep sub-wavelength structural dimensions. The adjustable structure parameter is more in the aspect of design, can be correspondingly adjusted according to the actual working condition demand, and has simple structure and easy manufacture.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic view of the underwater sound absorption subsurface structure of the present invention;
FIG. 2 is an exploded view of the double helical coupling unit of the present invention;
fig. 3 is a graph showing sound absorption coefficients within 100-300 Hz for three embodiments of the present invention.
Wherein: 1. perforating the upper panel; 2. a layer core; 3. a damping inner liner; 4. a ring-shaped separator; 5. 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.
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 double-spiral coupling underwater sound absorption super-surface structure, which is characterized in that an upper panel, a layer core and a lower panel are perforated by welding or cementing to form a plurality of double-spiral coupling units, and a damping lining layer is adhered on the side wall of each double-spiral coupling unit, so that the acoustic impedance characteristic of the structure is improved, and the low-frequency broadband sound absorption performance of the structure is improved. The planar spiral back cavity structure reduces the thickness of the structure on the premise of realizing good low-frequency underwater sound absorption performance, ensures the deep sub-wavelength size characteristic of the structure, and solves the problems of poor low-frequency sound absorption performance and excessive thickness of the traditional underwater sound absorption structure.
Referring to fig. 1, the double-screw coupling underwater sound absorption super-surface structure of the invention comprises a perforated upper panel 1, double-screw coupling units and a lower panel 5, wherein the double-screw coupling units comprise a plurality of double-screw coupling units, the double-screw coupling units are arranged between the perforated upper panel 1 and the lower panel 5, and small holes are periodically formed in the perforated upper panel 1, and each small hole corresponds to one double-screw coupling unit to form the double-screw coupling underwater sound absorption super-surface structure.
The double-screw coupling unit comprises a layer core 2, a damping lining layer 3 and a ring-shaped partition plate 4, wherein a screw channel is formed in the layer core 2, the damping lining layer 3 is arranged in the screw channel, a cavity is formed in the center of the layer core 2, one side of the cavity is connected with one end of the damping lining layer 3, and the ring-shaped partition plate 4 is arranged between the cavity and the damping lining layer 3.
Referring to FIG. 2, the layer core 2 is made of structural steel, the width of the spiral channel of the layer core 2 is 5-15 mm, and the height is 10-25 mm; the damping lining layer 3 is stuck on the side wall of each double-spiral coupled spiral channel, and the thickness of the damping lining layer 3 is 1.5-5 mm; the thickness of the annular partition board 4 is 0.2-1 mm; the length of the cavity is 3-8 mm.
The damping lining layer 3 is of a solid structure and is adhered to the side wall of the spiral channel of each double-spiral coupling unit.
The spiral shape of the damping lining layer 3 comprises a square spiral, an arc spiral or a multi-size multi-shape hybrid spiral; the number of turns of the spiral is at least 2.
The material of which the damper inner liner 3 is made is not limited to a viscoelastic material such as rubber, polyurethane, or the like.
The perforated upper panel 1, the layer core 2 and the lower panel 5 are connected by welding or gluing.
The perforated upper panel 1 is made of structural steel, small holes are periodically formed in the perforated upper panel 1, each small hole in the perforated upper panel 1 corresponds to a double-spiral coupling unit in the layer core structure, the diameter of each small hole is 1-5 mm, and the thickness of the perforated upper panel 1 is 0.2-2 mm.
In addition, the shape of the small holes in the perforated upper panel 1 is not limited to a circular shape, a triangular shape, a square shape, a petal shape, or an irregular shape.
The lower panel 5 is made of structural steel and the lower panel 5 is intended to be 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 double-spiral coupling cavity structure, and comprises a perforation diameter, a perforation upper panel thickness, a spiral channel width, a height, a circle number and a damping lining layer thickness. Because the structural parameters are adjustable parameters, the corresponding sound absorption and structural ultrathin can be realized by adjusting. The technical scheme of the invention is exemplified by the following specific examples.
Materials used in the examples:
Structural steel: the density is 7850kg/m 3, the Young's modulus is 200GPa, and the Poisson's ratio is 0.3.
Rubber: the density is 1100kg/m 3, the Young modulus is 10MPa, the Poisson ratio is 0.49, and the equivalent isotropy loss factor is 0.1.
Water: density 1000kg/m 3, sound velocity 1500m/s, dynamic viscosity coefficient 0.00101 Pa.s.
The structural dimensions and material selection of the embodiments:
Example 1
The diameter of the small hole is 4.8mm, the thickness of the perforated upper panel is 0.5mm, the width of the spiral channel is 8.8mm, the height is 19.4mm, the thickness of the damping lining layer is 2.4mm, the thickness of the annular partition plate is 0.2mm, the length of the cavity is 5.8mm, and the number of spiral turns is 3.
Example 2
The diameter of the small hole is 3.3mm, the thickness of the perforated upper panel is 0.2mm, the width of the spiral channel is 6.4mm, the height is 17.8mm, the thickness of the damping lining layer is 1.7mm, the thickness of the annular partition plate is 0.2mm, the length of the cavity is 4.3mm, and the number of spiral turns is 3.
Example 3
The diameter of the small hole is 2.6mm, the thickness of the perforated upper panel is 1.5mm, the width of the spiral channel is 7.6mm, the height is 18.1mm, the thickness of the damping lining layer is 1.9mm, the thickness of the annular partition plate is 0.2mm, the length of the cavity is 3.6mm, and the number of spiral turns is 3.
Referring to fig. 3, example 1 achieves perfect sound absorption at 151Hz, with a maximum value of 0.99 for sound absorption coefficient, and a structural thickness of 1/497 for wavelength;
example 2 achieves perfect sound absorption at 215Hz with a maximum of 0.99 sound absorption coefficient and a structural thickness of 1/387 of wavelength;
example 3 achieves perfect sound absorption at 182Hz with a maximum of 0.99 sound absorption coefficient and a structural thickness of 1/421 of the wavelength;
from the sound absorption coefficient curve, the invention can realize excellent low-frequency sound absorption performance in a certain frequency range, and the structure has the deep sub-wavelength structure size characteristic.
In summary, the double-spiral coupling underwater sound absorption super-surface structure has the following technical effects:
1. Has excellent low-frequency sound absorption performance.
The invention has the sound absorption peak value reaching more than 0.99 in the range of 100-300 Hz, thus realizing perfect sound absorption.
2. Has the structural dimension characteristics of deep sub-wavelength.
The structure size of the invention is only 1/497 of the working wavelength, and the invention belongs to the deep sub-wavelength structure size range, and the structure thickness is ultrathin.
3. With more adjustable parameters and variables.
The diameter of the perforation, the thickness of the perforated upper panel, the width and the height of the spiral channel, the thickness of the damping lining layer and the like are all adjustable parameters, and can be selected and adjusted according to specific use scenes, such as the requirement on low-frequency sound absorption or the requirement on structural thickness reasonably.
4. Simple structure and easy manufacture.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (5)
1. The double-screw coupling underwater sound absorption super-surface structure is characterized by comprising a plurality of double-screw coupling units, wherein the double-screw coupling units are arranged between a perforated upper panel (1) and a lower panel (5) in a welding or cementing mode, small holes are periodically formed in the perforated upper panel (1), each small hole corresponds to one double-screw coupling unit, and the double-screw coupling underwater sound absorption super-surface structure is formed and connected with underwater equipment through the lower panel (5);
The double-screw coupling unit comprises a layer core (2), wherein a screw channel is formed in the layer core (2), a damping inner liner (3) is arranged in the screw channel, a cavity is formed in the center of the layer core (2), one side of the cavity is connected with one end of the damping inner liner (3), a ring-shaped partition plate (4) is arranged between the cavity and the damping inner liner (3), the width of the screw channel is 5-15 mm, and the height of the screw channel is 10-25 mm; the number of turns of the spiral channel is at least 2;
the thickness of the annular partition plate (4) is 0.2-1 mm, the thickness of the perforated upper panel (1) is 0.2-2 mm, and the sound absorption peak value of the double-spiral coupling underwater sound absorption super-surface structure within 100-300 Hz is greater than 0.99.
2. The double helix coupled underwater sound absorption super surface structure as claimed in claim 1, wherein the shape of the helical channel comprises a square helix, a circular arc helix or a hybrid helix of multiple dimensions and shapes.
3. The double-spiral coupling underwater sound absorption super surface structure according to claim 1, wherein the thickness of the damping lining layer (3) is 1.5-5 mm.
4. The double-screw coupling underwater sound absorption super surface structure of claim 1, wherein the length of the cavity is 3-8 mm.
5. The double-spiral coupling underwater sound absorption super-surface structure according to claim 1, wherein the small holes are alternately arranged on the perforated upper panel (1), the diameter of the small holes is 1-5 mm, and the shape of the small holes comprises a circle, a triangle, a square, a petal shape or an irregular shape.
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