GB2620466A - Multifunctional metastructure with mechanical bearing and underwater sound insulation - Google Patents

Multifunctional metastructure with mechanical bearing and underwater sound insulation Download PDF

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Publication number
GB2620466A
GB2620466A GB2304736.8A GB202304736A GB2620466A GB 2620466 A GB2620466 A GB 2620466A GB 202304736 A GB202304736 A GB 202304736A GB 2620466 A GB2620466 A GB 2620466A
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sound insulation
face
metastructure
multifunctional
assemblies
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GB2620466B (en
GB202304736D0 (en
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Zhao Honggang
Wang Yang
Wang Chao
Yang Haibin
Zhong Jie
Zhang Hongjia
Yu Dianlong
Wen Jihong
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National University of Defense Technology
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National University of Defense Technology
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped
    • 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

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Architecture (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The multifunctional metastructure includes two cover plates oppositely arranged, and a sound insulation layer 2 arranged between the two cover plates 1. The sound insulation layer consists of a plurality of sound insulation assemblies 21. Each sound insulation assembly is of a tubular structure with a hexagonal section, the plurality of sound insulation assemblies are arranged in a honeycomb shape, an included angle between the cover plate and a connecting line between a central axis of each sound insulation assembly and a midpoint of a distal edge ranges from 20° to 30°. Every two adjacent sound insulation assemblies share one common edge, and a plurality of through holes 2114 are formed in edges of the sound insulation assemblies along the longitudinal axis of each assembly.

Description

MULTIFUNCTIONAL METASTRUCTURE WITH MECHANICAL BEARING AND UNDERWATER SOUND INSULATION
TECHNICAL FIELD
[1] The present disclosure belongs to the field of low-frequency sound insulation metastructures, and particularly relates to a multifunctional metastructure with mechanical bearing and underwater sound insulation.
BACKGROUND ART
[2] The use of underwater acoustic insulation materials to shield unnecessary noise radiation from underwater equipment is of great significance in reducing underwater sound communication interference, escaping from sonar detection and the like. The underwater sound insulation materials are widely applied in the field of noise control of the underwater equipment.
[3] Compared with limited bandwidth generated by Bragg scattering and local resonance in acoustic metamaterials, an impedance mismatch mechanism is an effective method for achieving low-frequency broadband sound insulation. Generally, acoustic impedance of isotropic solids is a product of mass density and velocity of longitudinal waves under the condition of normal incidence of acoustic waves. In consideration of thickness limitation of the underwater sound insulation materials, media with low density or low sound velocity are needed to generate strong reflection with water in order to achieve impedance mismatch with water. However, impedance of common homogeneous isotropic solids (such as rubber) is nearly the same as that of water. It is difficult to look for a material with low impedance as an acoustic soft boundary of the water medium. Bubbles may be regarded as a preferred choice of underwater sound insulation. However, the bubbles are not stable in ocean environments with water pressure, which limits their actual application.
[4] Traditional underwater sound insulation materials usually have the following two problems: poor low-frequency sound insulation and low mechanical bearing capacity. In fact, low-frequency sound insulation performance of the underwater sound insulation materials may greatly change under the action of hydrostatic pressure in actual working environment, and usually, the higher the hydrostatic pressure, the lower the low-frequency sound insulation performance of the materials. The demand on bearing leads to the difficulty of breakthrough in the low-frequency sound insulation performance of the underwater sound insulation materials, which has become one of the technical problems in the Lift. Therefore, it is very necessary and urgent to develop underwater metamaterials with performance of mechanical bearing and low-frequency sound insulation.
SUMMARY
[5] The present disclosure aims at providing a multifunctional metastructure with mechanical bearing and underwater sound insulation to solve technical problems.
[6] The multifunctional metastructure in the present disclosure includes two cover plates oppositely arranged, and a sound insulation layer located between the two cover plates. The sound insulation layer consists of a plurality of sound insulation assemblies, and each sound insulation assembly is of a tubular structure with a hexagonal section. The plurality of sound insulation assemblies are arranged in a honeycomb shape, and an included angle between the cover plate and a connecting line between a central axis of each sound insulation assembly and a midpoint of a distal edge ranges from 20' to 30'. Every two adjacent sound insulation assemblies share one common edge, and a plurality of through holes are formed in edges of the sound insulation assemblies along axes thereof.
[7] Furthermore, the through holes are rectangular holes.
[8] Furthermore, a thickness of each position of the sound insulation assemblies ranges from 0.4 mm to 0.6 mm under the arrangement of the through holes.
[9] Furthermore, the plurality of through holes are formed at equal intervals.
[10] Furthermore, connecting edges between every two rows of sound insulation assemblies are short thin side connecting edges and rectangular thin side connecting edges in sequence.
[11] Furthermore, the sound insulation assemblies arranged in the honeycomb shape each consist of sound insulation units, each sound insulation unit includes a whole side, a semi-short thin side arranged on one side of the whole side and a semi-rectangular thin side arranged on the other side of the whole side, and every four sound insulation units are symmetrically spliced pairwise to form one sound insulation assembly.
[12] Furthermore, each sound insulation unit has eight faces on its side walls in total, one side wall of the semi-rectangular thin side is the first face, one side face, close to the first face, of the whole side is the second face, one side face, dose to the second face, of the semi-short thin side is a third face, an end face of the semi-short thin side is a fourth face, the other side face of the semi-short thin is a fifth face, the other side face of the whole side is a sixth face, the other side of the semi-rectangular thin side is a seventh face, an end face of the semi-rectangular thin side is an eighth face, and the four sound insulation units forming one sound insulation assembly are a first sound insulation unit, a second sound insulation unit, a third sound insulation unit and a fourth sound insulation unit in sequence; [13] A distance between the eighth face in the first sound insulation unit and the eighth face in the second sound insulation unit is al, a distance between the fourth face and the eighth face in the first sound insulation unit is az, and a distance between the eighth face and an intersecting line between the second face and the first face is a3, wherein a2=1/2a1, and a3=3/10a2.
[14] Furthermore, a distance between the third face in the first sound insulation unit and the third face in the fourth sound insulation unit is bi, a distance between the third face and the seventh face in the first sound insulation unit is bz, a distance between the first face and the seventh face is 63, a distance between the second face and the sixth face is Yu, and a distance between the third face and the fifth face is b5, wherein b2=1/2111, b3=1/8b2, b4=1/4b7, and b5=1/25b2.
[15] Furthermore, an included angle a between the first face and the second face is 110°.
[16] Furthermore, physical parameters of materials of the cover plates and the sound insulation layer are as follows: a modulus of elasticity E is greater than or equal to 0.1 GPa and less than or equal to 210 GPa, a Poisson's ratio 11 is greater than or equal to 0.2 and less than or equal to 0.49, and a density p is greater than or equal to 1000 kg/m3 and less than or equal to 12000 kg/m3.
[17] The present disclosure has the beneficial effects that the through holes are formed in the edges of the sound insulation assemblies, compared with structures without the through holes, the setting of the through holes may increase an overall thickness of the sound insulation assemblies, which enhances the equivalent bending stiffness of the sound insulation assemblies, and therefore the strength of the sound insulation assemblies can be improved. Meanwhile, the addition of the through holes will not result in an increase in the density of the sound insulation assemblies, and therefore an underwater sound insulation index cannot be reduced, that is, on the premise of increasing the bearing capacity of the structure, the same sound insulation effect is ensured. In addition, the sound insulation assemblies can obtain minimum acoustic impedance by inclining all the sound insulation assemblies toward the two cover plates by 200 to 30°. Not only is the bearing capacity of the structure increased through structural changes under the conditions of the same materials, equal filling rate and equal thickness, but also the sound insulation capability of the structure is improved, and the structure has a better low-frequency broadband sound insulation effect. In the present disclosure, based on a quasi-static impedance mismatch mechanism, sound insulation problems at a low frequency band of 300 Hz-1000 Hz can be solved effectively, and meanwhile, the multifunctional metastructure has higher stiffness and yield strength. The underwater noise control under certain pressure environment can be implemented effectively, and the multifunctional metastructure has good engineering application prospects.
BRIEF DESCRIPTION OF THE DRAWINGS
1181 FIG. 1 is a cross section of a local structure of a honeycomb structure in the prior art; [19] FIG 2 is a cross section of a local structure of the present disclosure; [20] FIG 3 is a schematic structural diagram of the present disclosure; [21] FIG. 4 is a schematic structural diagram of a sound insulation unit of the present disclosure; [22] FIG. 5 is a schematic structural diagram of four spliced sound insulation units in the present disclosure; [23] FIG. 6 is a comparison diagram of stress-strain curves in honeycomb structure simulation examples in an embodiment of the present disclosure and the prior art; [24] FIG. 7 is a comparison diagram of sound insulation indexes within a frequency range from 300 Hz to 1000 Hz under normal pressure in honeycomb structure simulation examples in an embodiment of the present disclosure and the prior art.
[25] In the drawings, 1-cover plate; 2-sound insulation layer; 21-sound insulation assembly; 211-sound insulation unit; 2111-whole side; 2112-sem i-short thin side; 2113-semirectangular thin side; 2114-through hole; 211 1-first sound insulation unit; 211.2-second sound insulation unit; 211.3-third sound insulation unit; 211.4-fourth sound insulation unit; 201-first face; 202-second face; 203-third face; 204-fourth face; 205-fifth face; 206-sixth face; 207-seventh face; and 208-eighth face.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[26] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and apparently, the described embodiments are merely part, rather than all of the embodiments of the present disclosure. All other embodiments obtained by those ordinarily skilled in the art based on the embodiments of the present disclosure without involving inventive efforts should fall within the protection scope of the present disclosure.
[27] It should be noted that all directional indications (such as upper, lower, left, right, front and the like) in the embodiments of the present disclosure are only used for explaining relative position relations, movement conditions and the like of the components in a certain specific posture (as shown in figures). If the specific posture is changed, the directional indications may change accordingly.
[28] In addition, the terms "first" and "second" involved in the present disclosure are only for description, and should not be construed as indication or implication of relative importance or implicit indication of the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "multiple" means at least two, for example, two, three, etc., unless otherwise specifically defined.
[29] In the present disclosure, unless otherwise clearly specified and defined, the terms "connection", "fixing" and other terms should be understood in a broad sense, for example, -connection" may be fixed connection or detachable connection or integrated connection; it may also be mechanical connection or electrical connection, physical connection or wireless communication connection; and it may be direct connection or indirect connection through an intermediate medium, or internal communication between two dements or interaction relation between two elements, unless otherwise clearly defined. For those ordinarily skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to specific circumstances.
[30] In addition, the technical solutions in the embodiments of the present disclosure may be combined with each other, but should be based on that those ordinarily skilled in the art can implement it. If a combination of the technical solutions conflicts or cannot be implemented, it should believe that the combination of such technical solutions does not exist, and is beyond the protection scope of the present disclosure.
[31] As shown in FIG. 1 to FIG. 7, the multifunctional metastructure in the present disclosure includes two cover plates 1 oppositely arranged, and a sound insulation layer 2 located between the two cover plates 1. The sound insulation layer 2 consists of sound insulation assemblies 21, and each sound insulation assembly 21 is of a tubular structure with a hexagonal section. The plurality of sound insulation assemblies 21 are arranged in a honeycomb shape, and an included angle between the cover plate 1 and a connecting line between a central axis of each sound insulation assembly 21 and a midpoint of a distal edge ranges from 200 to 30'. Every two adjacent sound insulation assemblies 21 share one common edge, and a plurality of through holes 2114 are formed in edges of the sound insulation assemblies 21 along axes thereof.
[32] In the present disclosure, the through holes 2114 are formed in the edges of the sound insulation assemblies 21. Compared with structures without the through holes 2114, the setting of the through holes 2114 may increase an overall thickness of the sound insulation assemblies 21, which enhances the equivalent bending stiffness of the sound insulation assemblies 21, and therefore the strength of the sound insulation assemblies 21 can be improved. Meanwhile, the addition of the through holes 2114 will not result in an increase in density of the sound insulation assemblies 21, and therefore an underwater sound reduction index cannot be reduced, that is, on the premise of increasing the bearing capacity of the structure, the same sound insulation effect is ensured. In addition, the sound insulation assemblies 21 can obtain minimum acoustic impedance by inclining all the sound insulation assemblies 21 toward the two cover plates 1 by 200 to 30°. Not only is the bearing capacity of the structure increased through structural changes under the conditions of the same materials, equal filling rate and equal thickness, but also the sound insulation capability of the structure is improved. The structure has a better low-frequency broadband sound insulation effect. In the present disclosure, based on a quasi-static impedance mismatch mechanism, sound insulation problems at a low frequency band of 300 Hz-1000 Hz can be solved effectively, and meanwhile, the multifunctional metastructure has higher stiffness and yield strength. The underwater noise control under certain pressure environment can be implemented effectively, and the multifunctional metastructure can be applied for sound insulation and noise reduction of underwater equipment or other fields, and has good engineering application prospects.
[33] The through holes 2114 are rectangular holes. The through holes are set as the rectangular holes, so that all positions on edges of the sound insulation assemblies 21 are relatively uniform in thickness, that is, the sound insulation assemblies are roughly characterized by sheet metal parts. All positions of the sound insulation assemblies 21 are roughly uniform in thickness to ensure that the overall consumption is lower, materials are saved and the weight is reduced on the premise of achieving higher bearing capacity of the structure, and as a result the bearing capacities of all positions on the sound insulation layer 2 can be kept consistent. Preferably, a thickness of each position of the sound insulation assemblies 21 ranges from 0.4 nun to 0 6 mm under the arrangement of the through holes 2114, that is, the thickness of the sound insulation assemblies 21 roughly ranges from 0.4 mm to 0.6 nun [34] The plurality of through holes 2114 are formed at equal intervals, which not only achieves the purpose that all positions of the sound insulation assemblies 21 are roughly uniform in thickness, but also ensures that the hearing capacities of the positions of the sound insulation assemblies 21 are consistent, and therefore the overall bearing capacity is ensured.
[35] As shown in FIG. 2 and FIG. 3, connecting edges between every two rows of sound insulation assemblies 21 are short thin side connecting edges and rectangular thin side connecting edges in sequence. As the through holes 2114 are formed in the rectangular thin side connecting edges, the thicknesses of all positions of the rectangular thin side connecting edges are consistent with those of the short thin side connecting edges. In the embodiment, through interval arrangement of the short thin side connecting edges and the rectangular thin side connecting edges, the materials can be saved and the weight can be reduced, to a certain extent on the premise of not reducing the bearing capacity and the sound insulation effect. In addition, the plurality of sound insulation assemblies 21 can also be arranged and combined in a honeycomb shape conveniently.
[36] Specifically, the sound insulation assemblies 21 arranged in the honeycomb shape each consist of sound insulation units 211. As shown in FIG. 4, each sound insulation unit 211 includes a whole side 2111, a semi-short thin side 2112 arranged on one side of the whole side 2111, and a semi-rectangular thin side 2113 arranged on the other side of the whole side 2111. The semi-short thin side 2112, the whole side 2111 and thc semi-rectangular thin side 2113 are in a Z-shaped structure, and every four sound insulation units 211 are symmetrically spliced pairwise to form one sound insulation assembly 21 and the rectangular thin side connecting edge. As shown in FIG. 5, two sound insulation units 211 are spliced to form a semi-short thin side connecting edge and a semi-rectangular thin side connecting edge, and the plurality of sound insulation units 211 are spliced in sequence to form the short thin side connecting edges and the rectangular thin side connecting edges. The short thin side connecting edge and the rectangular thin side connecting edge are two edges of a hexagon of one sound insulation assembly 21.
[37] As shown in FIG. 4, each sound insulation unit 211 has eight faces on its side walls in total. A side wall of the semi-rectangular thin side 2113 is a first face 201, and a side face, close to the first face 201, of the whole side 2111 is a second face 202. A side face, close to the second face 202, of the semi-short thin side 2112 is a third face 203, and an end face of the semi-short thin side 2112 is a fourth face 204. The other side face of the semi-short thin side 2112 is a fifth face 205, and the other side face of the whole side 2111 is a sixth face 206. The other side of the semi-rectangular thin side 2113 is a seventh face 207, and an end face of the semi-rectangular thin side 2113 is an eighth face 208, wherein the first face 201 is connected with two ends of the second face 202 and the eighth face 208; the second face 202 is connected with two ends of the first face 201 and two ends of the third face 203; the third face 203 is connected with two ends of the second face 202 and two ends of the fourth face 204; the fourth face 204 is connected with two ends of the third face 203 and two ends of the fifth face 205; the fifth face 205 is connected with two ends of the fourth face 204 and two ends of the sixth face 206; the sixth face 206 is connected with two ends of the fifth face 205 and two ends of the seventh face 207; the seventh face 207 is connected with two ends of the sixth face 206 and two ends of the eighth face 208; and the eighth face 208 is connected with two ends of the seventh face 207 and two ends of the first face 201. In addition, the first face 201 is perpendicular to the eighth face 208. the seventh face 207 is perpendicular to the eighth face 208, the third face 203 is perpendicular to the fourth face 204, and the fifth face 205 is perpendicular to the fourth face 204.
[38] In addition, four sound insulation units 211 forming one sound insulation assemblies 21 are a first sound insulation unit 211.1, a second sound insulation unit 211.2, a third sound insulation unit 211.3 and a fourth sound insulation unit 211.4 in sequence; the four sound insulation units 211 form one sound insulation assemblies 21 as well as the semi-short thin side connecting edge and the semi-rectangular thin side connecting edge of another sound insulation assembly 21.
[39] In one of the embodiments, a distance between the eighth face 208 in the first sound insulation unit 211.1 and the eighth face 208 in the second sound insulation unit 211.2 is al, a distance between the fourth face 204 and the eighth face 208 in the first sound insulation unit 211.1 is a?, and a distance between the eighth face 208 and an intersecting line between the second face 202 and the first face 201 is 2.3, wherein a2=1/2a1, and a3=3/10a2.
[40] A distance between the third face 203 in the first sound insulation unit 211.1 and the third face 203 in the fourth sound insulation unit 211.4 is hi, a distance between the third face 203 and the seventh face 207 in the first sound insulation unit 211.1 is b2, a distance between the first face 201 and the seventh face 207 is b3, a distance between the second face 202 and the sixth face 206 is b4, and a distance between the third face 203 and the fifth face 205 is b5, wherein b7=1/2b1, b3=1/8b2, b4=1/4b7, and b5=1/25b2. In the embodiment, the section of the sound insulation assemblies 21 is not orthohexagonal, but is of a roughly elliptic axisymmetric and centrosymmetric hexagonal structure as shown in FIG. 2, and the bearing capacity and sound insulation capability thereof are higher. In the embodiment, an included angle a between the first face 201 and the second face 202 is 110', namely that the included angle 0 (between a y-axis component of the main axis of the sound insulation assembly 21 and the long edge side wall of the cover plate 1) between the cover plate 1 and the connecting line between the central axis of each sound insulation assembly 21 and the midpoint of the distal edge thereof is 30°.
[41] Physical parameters of materials of the cover plates 1 and the sound insulation layer 2 are as follows: a modulus of elasticity E is greater than or equal to 0.1 GPa and less than or equal to 210 GPa, a Poisson's ratio n is greater than or equal to 0.2 and less than or equal to 0.49, and a density p is greater than or equal to 1000 kg/m3 and less than or equal to 12000 kg/m3, to ensure that the requirements of the bearing capacity and sound insulation effect of the metastructure are met. The cover plates 1 and the sound insulation layer 2 may be made from metallic materials or non-metallic materials.
[42] The cover plates 1 and the sound insulation layer 2 are integrally printed and formed by a 3D printing technology or manufactured in machining manners such as wire electrical discharge machining, to ensure that the structure and size of the sound insulation layer 2 meet the requirements.
[43] The present disclosure further provides a specific embodiment: [44] Both the cover plates 1 and the sound insulation layer 2 are made from resins. The parameters of the resins are as follows: a modulus of elasticity E is 2.6 GPa, a Poisson's ratio 11 is 0.42, a density rho is 1250 kg/m3, and a yield strength as is 53 MPa. An overall thickness a of the metastructure is 58 mm, and a thickness c of the cover plate 1 is 2 mm. The distance al between the eighth face 208 in the first sound insulation unit 211.1 and the eighth face 208 in the second sound insulation unit 211.2 in one sound insulation assembly 21 is 20 mm, and the distance 1)1 between the third face 203 in the first sound insulation unit 211.1 and the third face 203 in the fourth sound insulation unit 211.4 is 20 mm; [45] The distance between the fourth face 204 and the eighth face 208 in the first sound insulation unit 211.1 is a2=1/2a1=1/2x20=10 mm, and the distance between the eighth face 208 the intersecting line between the second face 202 and the first face 201 is a3=3/10a2=3/10x10=3 mm; [46] The distance between the third face 203 and the seventh face 207 in the first sound insulation unit 211.1 is b2=1/2bi=1/2x20=10 mm, the distance between the first face 201 and the seventh face 207 is b3=1/8b7=1/8x10=1.25 mm, the distance between the second face 202 and the sixth face 206 is b4=1/41)2=1/4x10=2 5 nun, and the distance between the third face 203 and the fifth face 205 is b5=1/25b2=1/25 x 10=0.4 mm; [47] The included angle a between the first face 201 and the second face 202 in the first sound insulation unit 211.1 is 110', and the included angle 0 between the y-axis component of the main axis of the sound insulation assembly 21 and the long edge side wall of the cover plate I is 30'; [48] The uniformly distributed through holes 2114 with the same size are formed in the edges of the sound insulation assemblies 21 except for the short thin side connecting edges. The through holes 2114 are rectangular holes, the quantity q is 25, the length a' of the rectangle is 1.31 mm, the width b' of the rectangle is 1.31 mm, and a distance 6 between the adjacent rectangular holes is 0.6 mm.
[49] On the basis of meeting the above conditions, a comparison diagram of stress-strain curves of the metastructure in the embodiment of the present disclosure and a conventional anisotropic honeycomb structure in FIG. 6 is obtained through simulation calculation by commercial finite element software COMSOL Multiphysics, and FIG. 7 is a comparison diagram of sound reduction indexes of the metastructure in the embodiment of the present disclosure and the conventional anisotropic honeycomb structure within a frequency range of 300 Hz-1000 Hz under normal pressure.
[50] FIG. 6 shows the comparison diagram of the stress-strain curves, corresponding to un iaxi al compression response, of the metastructure in the embodiment of the present disclosure and the conventional anisotropic honeycomb structure under the conditions of the same materials, equal filling rate and equal thickness, wherein abscissas are nominal strains, and ordinates are normalized stresses (the ratio of applied stress to the yield strength of the materials). It can be seen from the comparison that not only has the metastructure in the embodiment of the present disclosure higher initial stiffness, but also the strength (2.14 MPa in the embodiment) is also higher than that of a common anisotropic honeycomb structure. The strength is one time higher than that (1.08 MPa) of the common anisotropic honeycomb structure, which shows that the metastructure in the embodiment of the present disclosure has higher bearing capacity compared with the conventional anisotropic honeycomb structure.
[51] FIG. 7 shows the comparison diagram of the sound reduction indexes of the metastructure in the embodiment of the present disclosure and the conventional anisotropic honeycomb structure under the conditions of the same materials, equal filling rate and equal thickness. It can be seen from the comparison that the low-frequency sound insulation performance of the metastructure in the embodiment of the present disclosure is far better than that of the conventional anisotropic honeycomb structure. The average sound reduction index of the metastructure in the embodiment is about 15.6 dB within a frequency range of 300 Hz-1000 Hz under the condition that the overall thickness is only 58 mm, and the metastructure may block about 97.25% of incident sound energy, and has a better low-frequency broadband sound insulation effect.
[52] Thus, it can be determined that the metastructure provided by the present disclosure has better mechanical bearing performance. Compared with the conventional anisotropic honeycomb structure, the metastructure with mechanical bearing and underwater sound insulation provided by the present disclosure has higher stiffness and strength, and can retain structural integrity under certain pressure to avoid structural damage and failure. Meanwhile, the metastructure has better low-frequency broadband sound insulation performance. Compared with the conventional anisotropic honeycomb structure, the metastructure has an average sound reduction index of 15.6 dB or so within a frequency range of 300 Hz-1000 Hz, while the overall thickness is only 58 mm, thereby achieving efficient sound insulation.
[53] The content which is not described detailedly in the specification belongs to the prior art known to those skilled in the art.

Claims (10)

  1. WHAT IS CLAIMED IS: 1. A multifunctional metastructure with mechanical bearing and underwater sound insulation, characterized by comprising two cover plates (1) oppositely arranged, and a sound insulation layer (2) arranged between the two cover plates (1); wherein the sound insulation layer (2) consists of a plurality of sound insulation assemblies (21), each sound insulation assembly (21) is of a tubular structure with a hexagonal section, the plurality of sound insulation assemblies (21) are arranged in a honeycomb shape, an included angle between the cover plate (1) and a connecting line between a central axis of each sound insulation assembly (21) and a midpoint of a distal edge ranges from 200 to 30°, every two adjacent sound insulation assemblies (21) share one common edge, and a plurality of through holes (2114) are formed in edges of the sound insulation assemblies (21) along axes thereof.
  2. 2. The multifunctional metastructure with mechanical bearing and underwater sound insulation according to claim 1, characterized in that the through holes (2114) are rectangular holes.
  3. 3. The multifunctional metastructure with mechanical bearing and underwater sound insulation according to claim 2, characterized in that a thickness of each position of the sound insulation assemblies (21) ranges from 0.4 mm to 0 6 mm under the arrangement of the through holes (2114).
  4. 4. The multifunctional metastructure with mechanical bearing and underwater sound insulation according to claim 1, characterized in that the plurality of through holes (2114) are formed at equal intervals.
  5. 5. The multifunctional metastructure with mechanical bearing and underwater sound insulation according to any one of claims 1-4, characterized in that connecting edges between every two rows of sound insulation assemblies (21) are short and thin connecting edges and rectangular thin connecting edges in sequence.
  6. 6. The multifunctional metastructure with mechanical bearing and underwater sound insulation according to claim 5, characterized in that the sound insulation assemblies (21) arranged in the honeycomb shape consist of sound insulation units (211), each sound insulation unit (211) comprises a whole side (2111), a semi-short thin side (2112) al-ranged on one side of the whole side (2111), and a semi-rectangular thin side (2113) arranged on the other side of the whole side (2111), and every four sound insulation units (211) are symmetrically spliced pairwise to form one sound insulation assembly (21) and one rectangular thin connecting edge.
  7. 7. The multifunctional metastructure with mechanical bearing and underwater sound insulation according to claim 5, characterized in that each sound insulation unit (211) has eight faces on its side walls in total, one side wall of the semi-rectangular thin side (2113) is a first face (201), one side face, close to the first face (1201), of the whole side (2111) is a second face (202), one side face, close to the second face (202), of the semi-short thin side (2112) is a third face (203), an end face of the semi-short thin side (2112) is a fourth face (204), the other side face of the semi-short and thin side (2112) is a fifth face (205), the other side face of the whole face (2111) is a sixth face (206), the other side of the semi-rectangular thin side (2113) is a seventh face (207), an end face of the semi-rectangular thin side(2113) is an eighth face (208), and the four sound insulation units (211) forming one sound insulation assembly (21) are a first sound insulation unit (211.1), a second sound insulation unit (211.2), a third sound insulation unit (211.3) and a fourth sound insulation unit (211.4) in sequence; and a distance between the eighth face (208) in the first sound insulation unit (211.1) and the eighth face (208) in the second sound insulation unit (211.2) is at, a distance between the fourth face (204) and the eighth face (208) in the first sound insulation unit (211.1) is a,, and a distance between the eighth face (208) and an intersecting line between the second face (202) and the first face (201) is a3, wherein a2=1/2a1, and a3=3/10a2.
  8. 8. The multifunctional metastructure with mechanical bearing and underwater sound insulation according to claim 7, characterized in that a distance between the third face (203) in the first sound insulation unit (211.1) and the third face (203) in the fourth sound insulation unit (211.4) is bi, a distance between the third face (203) and the seventh face (207) in the first sound insulation unit (211.1) is b2, a distance between the first face (201) and the seventh face (207) is b3, a distance between the second face (202) and the sixth face (206) is b4, and a distance between the third face (203) and the fifth face (205) is b5, wherein b2=1/2b1, b3=1/8b2, b4=1/4b2, and b5=1/25b2.
  9. 9. The multifunctional metastructure with mechanical bearing and underwater sound insulation according to claim 7, characterized in that an included angle a between the first face (201) and the second face (202) is 1100.
  10. 10. The multifunctional metastructure with mechanical bearing and underwater sound insulation according to claim 1, characterized in that physical parameters of materials of the cover plates (1) and the sound insulation layer (2) are as follows: a modulus of elasticity E is greater than or equal to 0.1 GPa and less than or equal to 210 GPa, a Poisson's ratio n is neater than or equal to 0.2 and less than or equal to 0.49, and a density p is greater than or equal to 1000 kg/m3 and less than or equal to 12000 kg/m3.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101418418B1 (en) * 2012-08-28 2014-07-09 삼성중공업 주식회사 Sound insulation structure

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101418418B1 (en) * 2012-08-28 2014-07-09 삼성중공업 주식회사 Sound insulation structure

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