CN110288971B - Straight column type lattice enhanced local resonance underwater sound absorption structure - Google Patents
Straight column type lattice enhanced local resonance underwater sound absorption structure Download PDFInfo
- Publication number
- CN110288971B CN110288971B CN201910538275.3A CN201910538275A CN110288971B CN 110288971 B CN110288971 B CN 110288971B CN 201910538275 A CN201910538275 A CN 201910538275A CN 110288971 B CN110288971 B CN 110288971B
- Authority
- CN
- China
- Prior art keywords
- sound absorption
- local resonance
- underwater sound
- local
- straight column
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention discloses a straight column type lattice enhanced local resonance type underwater sound absorption structure which comprises cells, wherein the cells are of a square structure, a plurality of local resonance bodies for sound absorption are periodically distributed in the cells, and a plurality of cell arrays are arranged to form the straight column type lattice enhanced local resonance type underwater sound absorption structure. The structure of the invention has excellent sound absorption performance and good water pressure resistance, realizes the light weight design of the underwater sound absorption structure, and is a multifunctional integrated structure with bearing, sound absorption and light weight.
Description
Technical Field
The invention belongs to the technical field of underwater sound absorption, and particularly relates to a straight column type lattice enhanced local resonance type underwater sound absorption structure.
Background
At present, the sound wave is the only communication mode capable of transmitting information underwater in a long distance, so that the vibration and noise reduction of equipment such as an underwater detector, a submarine vehicle and the like is a great engineering problem all the time. The Alberich type sound absorbing cover layer and the local resonance type phononic crystal are taken as two typical underwater sound absorbing structures and are widely researched and applied in recent years. Compared with the Alberich type sound absorption covering layer, the local resonance type phononic crystal has a more pressure-resistant structural form and a wider sound absorption frequency band range, so that the local resonance type phononic crystal has a wide engineering application space.
The local resonance type photonic crystal is an underwater sound absorption structure with the local resonance bodies which are periodically arranged and embedded in an elastic solid medium with a damping effect. Generally, the structure is laid on a steel housing of the underwater equipment for absorbing underwater sound waves. Under the excitation of underwater low-frequency sound waves, a local resonance body in the structure is used as a mass block, an elastic solid medium is used as a damper and a spring to form a spring oscillator system, and the loss of sound energy is caused by compression and expansion; in the middle frequency range, the vibration of the local resonance body can cause the shearing action of surrounding media to cause waveform conversion; in addition, when the sound wave frequency is high, impedance mismatch occurs on an interface when the wave meets a local resonance body in the transmission process, so that the scattering of the sound wave is caused, and the above is a sound absorption mechanism of the local resonance type photonic crystal. Most of the current researches on the local resonance type phononic crystal are embodied in the optimization and improvement of the structural design and the sound absorption performance. Researchers calculate the sound absorption performance of the local resonance type phononic crystal by means of theoretical calculation, numerical simulation, experiments and the like and combining various optimization algorithms, so that the sound absorption performance of the local resonance type phononic crystal is greatly improved, and low-frequency and broadband strong sound absorption can be realized. None of the above studies have considered the effect of hydrostatic pressure on the acoustic properties of the structure. Because the working environment of some large-scale underwater equipment is in the deep water region, therefore under the effect of hydrostatic pressure, very big deformation can take place for the elastic damping layer, and this will cause very big influence to the acoustic performance of structure, can make the structure even take place to lose efficacy.
Although the local resonance type phononic crystal has the characteristic of wider sound absorption frequency band, the local resonance type phononic crystal has the following problems in practical engineering application:
(1) the steel plate has no bearing effect, needs to be laid on a steel plate, has larger total mass with the steel plate, and is not beneficial to the design requirement of light weight;
(2) under the action of hydrostatic pressure, large deformations can occur, whose acoustic properties can be affected or even become ineffective.
Disclosure of Invention
The invention aims to solve the technical problem of providing a straight column type lattice reinforced local resonance underwater sound absorption structure aiming at the defects in the prior art, and solves the problems that the traditional local resonance type photonic crystal deforms under high hydrostatic pressure, and causes the reduction and even failure of acoustic performance.
The invention adopts the following technical scheme:
a straight column type lattice enhanced local resonance underwater sound absorption structure comprises cells, wherein the cells are of a square structure, a plurality of local resonance bodies used for sound absorption are periodically arranged in the cells, and a straight column type lattice enhanced local resonance underwater sound absorption structure is formed by arranging a plurality of cell arrays.
Specifically, the cellular comprises an upper panel and a lower panel, the two panels are connected through four rods which are periodically arranged in a square shape to form a square structure, a damping layer is arranged between the two panels, and the local resonance body is arranged in the damping layer.
Furthermore, the thickness of the panel is 2-3 mm.
Furthermore, the panel and the rod piece are both made of resin-based carbon fiber composite materials or resin-based glass fiber composite materials.
Furthermore, the thickness of the damping layer is 32-45 mm.
Further, the damping layer is made of rubber or polyurethane, and the equivalent isotropic loss factor of the rubber or the polyurethane is greater than or equal to 0.3.
Further, the rod piece is respectively and vertically connected with the upper panel and the lower panel, the diameter of the rod piece is 2-3 mm, and the wheel base of the two adjacent rod pieces is 32-45 mm.
Specifically, the radius of the local resonance body is 4-7 mm.
Specifically, the distance between two adjacent local resonators is 1-2 mm, and the distance between the upper and lower local resonators is 0.5-2 mm.
Specifically, the shape of the local resonator is one or more of a cylinder type, a sphere type, an ellipsoid type and a cube type.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention relates to a straight column type lattice enhanced local resonance type underwater sound absorption structure, which is based on an Alberich type sound absorption covering layer, greatly improves the mechanical property of the structure while ensuring the acoustic property through square cells containing periodically arranged local resonance bodies, and can be directly used for manufacturing shells and wall surfaces of underwater equipment such as detectors, underwater vehicles and the like.
Furthermore, two panels are laid on the upper side and the lower side of the damping layer containing the local resonance body, and the two panels are connected through the vertical rods which are periodically arranged in a square shape to form a straight column type lattice reinforced structure, so that the water pressure resistance and the sound absorption performance of the structure are greatly improved, and meanwhile, the lightweight design of the underwater sound absorption structure is realized.
Further, in order to enable the panel to have enough rigidity so that the panel cannot deform greatly under the action of hydrostatic pressure, the thickness of the panel is set to be 2-3 mm.
Furthermore, in order to realize the lightweight design of the structure and improve the mechanical property of the structure, the panel and the rod piece are made of resin-based carbon fiber composite materials or resin-based glass fiber composite materials with high specific stiffness and high specific strength.
Furthermore, in order to enable the structure to achieve good sound absorption performance and reduce the thickness of the structure, the thickness of the damping layer is set to be 32-45 mm.
Further, in order to ensure the loss capability of the damping layer to the sound wave energy, the damping layer is made of rubber or polyurethane, and the equivalent isotropic loss factor of the rubber or polyurethane needs to be more than or equal to 0.3.
Further, have sufficient compression modulus in order to guarantee the structure, make the panel have sufficient rigidity simultaneously to the structure can not take place big deformation under hydrostatic pressure's effect, make more acoustic energy simultaneously and spread into in the middle of the damping layer, consequently with member and two upper and lower panels respectively perpendicular connection, and the diameter that sets up the member is 2~3mm, the wheel base of two adjacent members sets up to 32~45 mm.
Further, in order to enable sound waves in the damping layer to be dissipated by the local resonance structure as much as possible and improve the sound absorption performance of the structure, the radius of the local resonance body is set to be 4-7 mm, the distance between two adjacent local resonance bodies is set to be 1-2 mm, and meanwhile, the distance between the upper local resonance body and the lower local resonance body is set to be 0.5-2 mm.
Furthermore, in order to enable the sound waves in the damping layer to be scattered to a greater extent, and thus improve the sound absorption performance of the structure, the shape of the local resonance body is set to be one or more of a cylinder type, a spherical type, an ellipsoid type and a cube type.
In conclusion, the underwater sound absorption structure has excellent sound absorption performance and good water pressure resistance, realizes the light weight design of the underwater sound absorption structure, and is a multifunctional integrated structure with bearing, sound absorption and light weight.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic diagram of a sound absorption structure of the present invention, wherein (a) is a schematic diagram of a structure of a cell, (b) is an exploded view of the structure, and (c) is a schematic diagram of a cell array;
FIG. 2 is a schematic view of an embodiment of the sound absorbing structure of the present invention, wherein (a) is the relationship between the compressive load and the equivalent strain borne by the three embodiments, and (b) is the maximum displacement of the three embodiments under the action of hydrostatic pressure of 0-4.5 MPa;
FIG. 3 is a schematic diagram of sound absorption coefficients of three embodiments of the present invention in the range of 0 to 10000 Hz.
Wherein: 1. a panel; 2. a damping layer; 3. a rod member; 4. a local resonator.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention relates to a straight column type lattice reinforced local resonance type underwater sound absorption structure which is composed of four parts, namely a panel, a rod piece, a damping layer and a local resonance body. The panel and the rod are made of resin-based carbon fiber composite materials or resin-based glass fiber composite materials with high specific stiffness and high specific strength, and the damping layer is made of rubber or polyurethane with the equivalent isotropic loss factor of 0.3 or more. The main functions of the panel are to enhance the bending resistance of the invention, prevent the structure from sinking inwards under the action of hydrostatic pressure, the main functions of the rod piece are to support the upper panel and the lower panel and prevent the structure from compression deformation under the action of hydrostatic pressure, and the main functions of the damping layer and the local resonance body are to convert, scatter and absorb underwater sound waves.
Referring to fig. 1, the pillar-shaped lattice-enhanced local resonance underwater sound absorption structure of the present invention includes a plurality of square-shaped cells, a plurality of local resonators 4 are periodically arranged in each square-shaped cell, and the plurality of square-shaped cells are arranged in an array to form the pillar-shaped lattice-enhanced local resonance underwater sound absorption structure.
The square cellular comprises an upper panel 1, a lower panel 1, a damping layer 2 and rod pieces 3, wherein the upper panel 1 and the lower panel 1 are the same in thickness, the damping layer 2 is filled between the upper panel 1 and the lower panel 1, a plurality of layers of local resonators 4 are periodically arranged in the damping layer 2, and the four rod pieces 3 are arranged between the upper panel 1 and the lower panel 1 in a square periodic manner and are used for connecting the upper panel 1 and the lower panel 1 into the square cellular.
The panel 1 is made of resin-based carbon fiber composite materials or resin-based glass fiber composite materials; the thickness of the panel 1 is 2-3 mm, and the length and width depend on the size of the whole structure.
The damping layer 2 is made of rubber or polyurethane with equivalent isotropic loss factor more than or equal to 0.3; the thickness of the damping layer 2 is 32-45 mm, and the length and the width depend on the size of the whole structure.
The rod piece 3 is made of resin-based carbon fiber composite material or resin-based glass fiber composite material; the rod piece 3 is perpendicular to and connected with the upper panel 1 and the lower panel 1, the diameter of the rod piece 3 is 2-3 mm, and the axle distance of the two adjacent rod pieces 3, namely the side length of the cell is 32-45 mm.
The radius of the local resonance body 4 is 4-7 mm; the distance between two adjacent left and right/front local resonators 4 is 1-2 mm, and the distance between two local resonators 4 is 0.5-2 mm.
The shape of the local resonator 4 is one or more of a cylinder type, a sphere type, an ellipsoid type and a cube type.
Preferably, referring to fig. 1(c), the structure is a pillar-shaped lattice-enhanced local resonance underwater sound absorption structure obtained by arranging cells in a 10 × 10 array, wherein 27 local resonators 4 are arranged in the damping layer 2 of each cube-shaped cell.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, 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 present invention, 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The mechanical properties and acoustic properties of the invention are estimated by using a finite element method, and the technical scheme of the invention is exemplarily described by examples in specific applications.
The materials used in the examples were as follows:
carbon fiber: it is characterized by a density of 1450kg/m3Young's modulus 80GPa, Poisson's ratio 0.1 and equivalent isotropic loss factor 0.
Rubber: it is characterized by a density of 1100kg/m3Young's modulus 10MPa, Poisson's ratio 0.49, and equivalent isotropic loss factor 0.3.
Water: it is characterized by a density of 1000kg/m3The speed of sound is 1500 m/s.
Air: it is characterized by a density of 1.29kg/m3The speed of sound is 343 m/s.
Structural dimensions of the examples:
example 1
The thickness of the panel is 2mm, the thickness of the damping layer is 32mm, the side length of a cell is 32mm, the radius of the rod piece is 2mm, the radius of the local resonator is 4mm, the distance between the left local resonator and the right local resonator/the front local resonator and the back local resonator is 2mm, the distance between the two local resonators is 2mm, and the distance between the first local resonator and the upper panel is 2 mm.
Example 2
The thickness of the panel is 2.5mm, the thickness of the damping layer is 40mm, the side length of a cell is 40mm, the radius of the rod piece is 2.5mm, the radius of the local resonance body is 5.5mm, the distance between the left local resonance body and the right local resonance body/the front local resonance body and the back local resonance body is 1.5mm, the distance between the two local resonance bodies is 1mm, and the distance between the first local resonance body and the upper panel is 1 mm.
Example 3
The thickness of the panel is 3mm, the thickness of the damping layer is 45mm, the side length of a cell is 45mm, the radius of the rod piece is 3mm, the radius of the local resonator is 7mm, the distance between the left local resonator and the right local resonator/the front local resonator and the back local resonator is 1mm, the distance between the two local resonators is 0.5mm, and the distance between the local resonator on the first layer and the upper panel is 0.5 mm.
Numerical simulations using the materials and structural dimensions described above gave the following results for the examples:
in terms of mechanical properties, the relationship between compressive load and equivalent strain borne by three embodiments of the straight column type lattice reinforced local resonance type underwater sound absorption structure is shown in fig. 2 a. As can be seen from the figure, the compressive load and the equivalent strain of the present invention are in a linear relationship, and the ratio of the two is the equivalent compressive modulus.
As can be seen from the graph, the equivalent compressive modulus of the material of the present invention is 363MPa in example 1, 336MPa in example 2, and 381MPa in example 3.
Since the carbon fiber rod is the most important bearing part in the structure of the invention, the larger the proportion of the cross-sectional area of the carbon fiber rod in the cellular area is, the better the compression resistance of the structure is. Therefore, the invention has good compression resistance.
Referring to fig. 2b, the three embodiments of the straight column lattice reinforced local resonance underwater sound absorption structure have the maximum displacement under the action of the hydrostatic pressure of 0-4.5MPa, so that under the hydrostatic pressure of 4.5MPa, namely under the hydrostatic pressure of about 450m of water depth, the maximum deformation of the structure is less than 0.53mm,
wherein the maximum displacement of example 1 is 0.47mm, which is only 1.3% of the total thickness of example 1;
the maximum displacement of example 2 is 0.53mm, only 1.1% of the total thickness of example 2;
the maximum displacement for example 3 was 0.45mm, only 0.8% of the total thickness of example 3,
in general, the maximum displacement of the embodiment depends primarily on the radius of the rod. From the above data, it can be considered that the acoustic performance of the present invention is not affected at a hydrostatic pressure of 450 m.
In terms of acoustic performance of the present invention, referring to fig. 3, three embodiments of a straight columnar lattice enhanced local resonance type underwater sound absorption structure have sound absorption coefficients in the range of 0-10000 Hz.
As can be seen from the figure, the sound absorption coefficient of the embodiment 1 in the range of 4100-5800 Hz is more than 0.8, and the sound absorption peak value is reached at 4800Hz, and the peak value is 0.92;
in the embodiment 2, the sound absorption coefficient in the range of 3300-10000 Hz is more than 0.8, and the sound absorption peak value is reached at 4300Hz, and the peak value is 0.99;
in the embodiment 3, the sound absorption coefficient in the range of 3400-10000 Hz is more than 0.8, and the sound absorption peak value is reached at 4600Hz, and the peak value is 0.99.
From the sound absorption peak position, the frequency corresponding to the peak position of the embodiment 2 is the lowest, the sound absorption performance is better in the lower frequency band, the peak value is close to 1, and the perfect acoustic absorption can be realized.
From the viewpoint of sound absorption bandwidth, the sound absorption bandwidths of example 1, example 2 and example 3 are 1700Hz, 6700Hz and 6600Hz, respectively, and thus the sound absorption band of example 2 is wide, but in summary, example 2 has the highest sound absorption peak, the lowest perfect acoustic absorption frequency and the widest sound absorption band, and thus the acoustic performance of example 2 is optimal.
According to the data, the technical effects achieved by the invention are as follows:
1. the simulation model of the test piece is in a certain range of 3300-10000 Hz, the sound absorption coefficient can reach more than 0.8, the sound absorption peak value is 0.99, and the requirement of perfect sound absorption in a certain frequency band is met;
2. under the hydrostatic pressure within the water depth of 450m, the maximum deformation of the structure is only 0.53mm and is only 1.3% of the total thickness of the structure, so that the acoustic performance of the structure is not influenced, and the requirement of maintaining the sound absorption performance under the high hydrostatic pressure is met;
3. the panel and the rod piece are made of light resin-based carbon fiber composite materials or resin-based glass fiber composite materials, local resonance is formed in the damping layer made of rubber, the density of the whole structure is reduced compared with the local resonance type photonic crystal which is widely used at present and laid on a steel plate, and the total thickness of the structure is only 5cm, so that the requirement of light weight design is met;
4. the structure is simple and the processing is easy;
5. by changing the geometric dimensions of the rod piece and the panel and the geometric dimensions and the arrangement mode of the local resonance body, the mechanical property and the acoustic property of the structure can be conveniently changed, so that the structure has strong designability of performance, and the multifunctional design requirement of bearing, sound absorption and light weight is met.
According to the characteristics of the straight column type lattice reinforced local resonance type underwater sound absorption structure, the straight column type lattice reinforced local resonance type underwater sound absorption structure can be used for manufacturing shells and wall surfaces of underwater equipment such as detectors and underwater vehicles, the requirements of underwater shock absorption and noise reduction are met, the straight column type lattice reinforced local resonance type underwater sound absorption structure has a wide engineering application prospect, and a brand new solution is provided for the underwater shock absorption and noise reduction of an engineering structure and the multifunctional design of a light sandwich structure.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (3)
1. A straight column type lattice enhanced local resonance type underwater sound absorption structure is characterized by comprising cells, wherein the cells are of a cube type structure, a plurality of local resonance bodies (4) used for sound absorption are periodically arranged in the cells, and a plurality of cell arrays are arranged to form the straight column type lattice enhanced local resonance type underwater sound absorption structure;
the cellular comprises an upper panel and a lower panel (1), the two panels (1) are connected through four rod pieces (3) which are periodically arranged in a square shape to form a square structure, a damping layer (2) is arranged between the two panels (1), the local resonance bodies (4) are arranged in the damping layer (2), the thickness of the panels (1) is 2-3 mm, the thickness of the damping layer (2) is 32-45 mm, the rod pieces (3) are respectively and vertically connected with the upper panel and the lower panel (1), the diameter of the rod pieces (3) is 2-3 mm, the axle distance of the two adjacent rod pieces (3) is 32-45 mm, the radius of the local resonance bodies (4) is 4-7 mm, the interval of the two adjacent local resonance bodies (4) is 1-2 mm, and the interval of the upper local resonance body and the lower local resonance body (4) is 0.5-2 mm.
2. The underwater sound absorption structure of the straight column lattice enhanced local resonance type as claimed in claim 1, wherein the panel (1) and the rod member (3) are made of resin-based carbon fiber composite material or resin-based glass fiber composite material.
3. The straight column lattice reinforced local resonance underwater sound absorption structure as claimed in claim 1, wherein the damping layer (2) is made of rubber or polyurethane, and the equivalent isotropic loss factor of the rubber or polyurethane is greater than or equal to 0.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910538275.3A CN110288971B (en) | 2019-06-20 | 2019-06-20 | Straight column type lattice enhanced local resonance underwater sound absorption structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910538275.3A CN110288971B (en) | 2019-06-20 | 2019-06-20 | Straight column type lattice enhanced local resonance underwater sound absorption structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110288971A CN110288971A (en) | 2019-09-27 |
| CN110288971B true CN110288971B (en) | 2022-03-15 |
Family
ID=68004355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910538275.3A Active CN110288971B (en) | 2019-06-20 | 2019-06-20 | Straight column type lattice enhanced local resonance underwater sound absorption structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110288971B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111696505B (en) * | 2020-06-01 | 2023-03-28 | 西安交通大学 | Deep sub-wavelength superstructure of sound absorption under annular fluting low frequency |
| CN113074203B (en) * | 2021-03-15 | 2023-01-24 | 天津大学 | Vibration isolation device based on two-dimensional elastic wave metamaterial and particle collision damping |
| CN113314089A (en) * | 2021-06-22 | 2021-08-27 | 全球能源互联网研究院有限公司 | Sound insulation structure with low-frequency broadband sound insulation function |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102930862A (en) * | 2012-09-28 | 2013-02-13 | 中国船舶重工集团公司第七二五研究所 | Z-direction enhanced underwater sound absorption sandwich composite material and preparation method for same |
| WO2015102090A1 (en) * | 2013-12-30 | 2015-07-09 | 新日鉄住金化学株式会社 | Composite substrate, optical sensor, localized surface plasmon resonance sensor, usage thereof, detection method, moisture selective permeable filter, and sensor provided therewith |
| CN108417195A (en) * | 2018-06-13 | 2018-08-17 | 山东理工大学 | A kind of middle low frequency absorption metamaterial structure based on resonant cavity |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09198050A (en) * | 1996-01-22 | 1997-07-31 | Oki Electric Ind Co Ltd | Water pressure resisting sound insulator |
| CN102416714B (en) * | 2011-08-16 | 2014-04-23 | 西安交通大学 | Lattice metal-foamed aluminium composite material and preparation method thereof |
| CN102708853B (en) * | 2012-05-15 | 2014-05-28 | 北京交通大学 | Three-dimensional phonon functional material structure comprising resonance units and manufacturing method thereof |
| CN103996395A (en) * | 2014-05-29 | 2014-08-20 | 西安交通大学 | Elastic membrane-type low-frequency sound insulation metamaterial structure |
| CN105118496B (en) * | 2015-09-11 | 2019-09-13 | 黄礼范 | Acoustic metamaterial basic structural unit and its composite construction and assembly method |
| CN105374348B (en) * | 2015-10-14 | 2019-02-05 | 江苏大学 | A kind of low-frequency ultra-wideband gap valve type locally resonant acoustic metamaterial |
| KR101843798B1 (en) * | 2016-09-02 | 2018-03-30 | 한양대학교 산학협력단 | Device for reducing noise of sound meta structure |
| CN206639584U (en) * | 2017-03-14 | 2017-11-14 | 哈尔滨工程大学船舶装备科技有限公司 | A kind of sound absorption cell cube of MULTILAYER COMPOSITE containing cavity suitable for underwater environment |
| CN107578767A (en) * | 2017-09-29 | 2018-01-12 | 哈尔滨工程大学船舶装备科技有限公司 | A kind of cavity wedge absorber complex with metallic framework |
| CN108053819A (en) * | 2018-01-15 | 2018-05-18 | 中国空间技术研究院 | Vibration-proof structure |
| CN108806661A (en) * | 2018-03-26 | 2018-11-13 | 镇江中波声学科技有限公司 | It is a kind of that the ultra-thin no fiber absorbing material component of sequence is expanded based on the in parallel of multiple-unit coupling |
| CN208256285U (en) * | 2018-06-26 | 2018-12-18 | 西北工业大学 | A kind of low frequency underwater sound absorption structure of embedded with spiral rigid structure |
| CN109410906B (en) * | 2018-09-13 | 2020-06-23 | 温州大学 | Local resonance phononic crystal structure and sound insulation wallboard using same |
| CN109754777A (en) * | 2018-12-28 | 2019-05-14 | 西安交通大学 | A kind of multi cell collaboration coupling acoustic metamaterial construction design method |
-
2019
- 2019-06-20 CN CN201910538275.3A patent/CN110288971B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102930862A (en) * | 2012-09-28 | 2013-02-13 | 中国船舶重工集团公司第七二五研究所 | Z-direction enhanced underwater sound absorption sandwich composite material and preparation method for same |
| WO2015102090A1 (en) * | 2013-12-30 | 2015-07-09 | 新日鉄住金化学株式会社 | Composite substrate, optical sensor, localized surface plasmon resonance sensor, usage thereof, detection method, moisture selective permeable filter, and sensor provided therewith |
| CN108417195A (en) * | 2018-06-13 | 2018-08-17 | 山东理工大学 | A kind of middle low frequency absorption metamaterial structure based on resonant cavity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110288971A (en) | 2019-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110288971B (en) | Straight column type lattice enhanced local resonance underwater sound absorption structure | |
| CN110288969B (en) | Straight column type lattice reinforced cavity type underwater sound absorption structure | |
| Gao et al. | Acoustic metamaterials for noise reduction: a review | |
| CN110176224B (en) | Pyramid-shaped lattice reinforced cavity type underwater sound absorption structure | |
| US9076429B2 (en) | Acoustic metamaterials | |
| CN110310617A (en) | A kind of enhancing of right cylinder type dot matrix is mingled with type underwater sound absorption structure | |
| CN110211559A (en) | A kind of pyramid lattice scattering body is mingled with type underwater sound absorption structure | |
| US20030062217A1 (en) | Acoustic attenuation materials | |
| CN112324827A (en) | Double-layer pyramid type light vibration reduction metamaterial lattice structure | |
| CN108662081B (en) | Three-dimensional phononic crystal vibration damper based on compaction force | |
| KR101928141B1 (en) | Acoustic metamaterials composite structures for impact and vibration mitigation | |
| CN111739500A (en) | Underwater broadband sound absorption structure of perforated sandwich plate modified by damping layer | |
| CN111739502A (en) | Underwater sound absorption metamaterial with damping lining hexagonal honeycomb perforated plate | |
| CN110565829A (en) | Building shockproof structure | |
| CN114619726B (en) | Lattice sandwich board based on acoustic black holes and manufacturing method | |
| CN114108860A (en) | Damping unit cell with phononic crystal low-frequency filtering characteristic and preparation method thereof | |
| CN105774052B (en) | The core filled composite material of multiple-layer stacked curved surface scapus born of the same parents' structure | |
| CN111696505B (en) | Deep sub-wavelength superstructure of sound absorption under annular fluting low frequency | |
| CN211145203U (en) | Periodic structure with bistable nonlinear energy trap | |
| CN211525407U (en) | Periodic structure with nonlinear energy trap | |
| CN210637425U (en) | Particle damping phononic crystal structure | |
| CN111364526A (en) | Three-dimensional face-centered cubic seismic metamaterial with low-frequency damping characteristic | |
| CN216430358U (en) | Cross elliptical elastic metamaterial structure with low-frequency vibration reduction characteristic | |
| An et al. | Design of Kagome lattice composite sandwich metastructures with high load bearing and low frequency vibration reduction properties | |
| CN114495881A (en) | Nonlinear structural unit and low-frequency broadband noise reduction metamaterial structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |