CN112837667A - A gradient film type periodic composite structure - Google Patents
A gradient film type periodic composite structure Download PDFInfo
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- CN112837667A CN112837667A CN202010761288.XA CN202010761288A CN112837667A CN 112837667 A CN112837667 A CN 112837667A CN 202010761288 A CN202010761288 A CN 202010761288A CN 112837667 A CN112837667 A CN 112837667A
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- 230000000737 periodic effect Effects 0.000 title claims abstract description 21
- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 239000002923 metal particle Substances 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000005060 rubber Substances 0.000 claims description 6
- 239000013013 elastic material Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000011133 lead Substances 0.000 claims description 2
- -1 polyethylene Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920002379 silicone rubber Polymers 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 24
- 239000010408 film Substances 0.000 description 61
- 239000000463 material Substances 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012774 insulation material Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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- 238000012552 review Methods 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Building Environments (AREA)
Abstract
本发明公开了一种梯度薄膜型周期复合结构，该周期复合结构包括弹性薄膜、重物、支撑框架，其中弹性薄膜是由上下两片薄膜组成，在两片膜的中间放置重物，然后抽空两片薄膜间的空气，再加热压制，使重物与薄膜形成一个整体，最后将该整体安置在支撑框架上紧绷固定，重物按其质心周期排列，即该周期结构可以划分为n个边长为a的正方形元胞，每个正方形元胞的中心为重物的质心位置。正方形元胞附加重物的质量按比例沿一个方向呈梯度变化，如此令该发明能够在多个频带内实现隔声，极大扩宽隔声频带。
The invention discloses a gradient film type periodic composite structure. The periodic composite structure includes an elastic film, a heavy object and a supporting frame, wherein the elastic film is composed of two upper and lower films. A heavy object is placed in the middle of the two films, and then evacuated. The air between the two films is heated and pressed to make the weight and the film form a whole, and finally the whole is placed on the support frame and fixed tightly. A square cell with side length a, the center of each square cell is the center of mass of the weight. The mass of the additional weight in the square cell changes proportionally along one direction in a gradient, so that the invention can achieve sound insulation in multiple frequency bands and greatly widen the sound insulation frequency band.
Description
Technical Field
The invention belongs to the field of vibration reduction, and particularly relates to a gradient film type periodic composite structure.
Background
With the rapid development of science and technology, the quality of life is gradually improved. The requirements of sound insulation materials in the manufacturing of vehicle engines and buildings are increasing in military aviation, ships and warships and life. But the well-known sound insulation and sound insulation materials such as fibers, sound insulation boards and sound insulation walls have remarkable effect in the range of higher frequency. However, the sound insulation material follows the law of mass action, so that the traditional material has not ideal effect in the low-frequency stage. The film type acoustic metamaterial has the characteristics of light weight, low frequency sound insulation and strong designability, and becomes a new favorite in the field of vibration and noise reduction. Due to the huge difference of the density of the elastic film and the additional weight, under the action of acoustic excitation, the vibration at different positions of the film surface is in reverse phase, so that the isolation of sound waves with specific frequency is finally realized, and the energy of the sound waves is consumed due to the damping action of the viscoelastic film, so that the isolation action of the sound waves is realized.
In 1991, a Japanese scholars Hashimoto adds a plurality of weights on the surface of a large-size film (200X 150 mm), the distance between the weights is 30mm, and tests show that a film structure with additional mass can improve the low-frequency sound insulation performance of the structure per se, and the film structure is called MAW (membrane with additional weights). In 2008, hong Kong science and technology university Yang et al put forward the concept of film type acoustic metamaterial on Physical Review Letters for the first time, the film type acoustic metamaterial is formed by fixing an elastic tensioning film with additional mass on a support grid structure, and the elastic tensioning film with the additional mass can realize effective sound insulation at low frequency through an impedance tube test surface. The variation of the effective sound insulation range can be achieved by adjusting the mass of the additional weight. In subsequent researches, 4 layers of thin film type acoustic metamaterials with different sound insulation ranges are stacked together, and sound insulation of sound waves with the frequency of 50-1000 Hz up to 40d B is achieved. In recent years, scholars conduct systematic research on the regulation and control rule of the physical mechanism and the sound insulation characteristic of the film type acoustic metamaterial, and analyze the influence of parameters such as film surface density, additional mass, size of the film and the additional mass, film tension and the like.
The traditional MAMs usually have only one working frequency range, and the gradient type and active adjustable type MAMs can flexibly adapt to different environments and meet different working requirements. MAMs have strong regulation and control capability on sound waves in a low frequency range (100-1000 Hz), and can realize vibration reduction and noise reduction in a larger frequency range.
Disclosure of Invention
The invention aims to provide a gradient film type periodic composite structure, after a gradient is introduced, the cell type is changed along one direction, sound insulation can be realized in a plurality of frequency bands, and the sound insulation frequency band is greatly widened. The sound insulation frequency band of the film type periodic composite structure consisting of the same cells is generally unique, and the range of the sound insulation frequency band is smaller than that of the gradient film type periodic composite structure.
In order to achieve the purpose, the invention provides the following technical scheme:
a gradient film type periodic composite structure comprises an elastic film, a heavy object and a support frame. The elastic film is composed of an upper film and a lower film, a heavy object is placed between the two films, then air between the two films is pumped out, heating and pressing are carried out, the heavy object and the films form a whole, and finally the whole is placed on the supporting frame to be tightened and fixed. The weights are arranged according to the center of mass period, namely the periodic structure can be divided into n square cells with the side length of a, and the center of each square cell is the center of mass position of the weight. The heavy material quantity of the square unit cells in each row, namely in the x direction, is the same, and the heavy material quantity of the square unit cells in the y direction is changed in a gradient manner; or the mass of the weight (2) of the y-direction square unit cell is the same, and the mass of the weight (2) of the x-direction square unit cell is changed in a gradient manner.
Wherein:
the elastic film is made of elastic materials, such as: high pressure polyethylene, rubber or silicone rubber.
The weight is metal particles made of iron, lead or copper and is spherical, cylindrical, cubic or cuboid in shape.
The metal particles are single particles or are formed by particle groups. When the metal particles are composed of particle groups, the positions of the mass centers of the metal particles are ensured to be arranged according to the period of the mass centers of the metal particles.
The supporting frame is a rectangular frame, and the invention provides two forms which can be selected according to the requirements. One frame is a fixed frame and has no function of adjusting the stress of a film; the upper end of the other frame is provided with a rotating shaft which can roll up the film, thereby applying tension to the film to adjust the tension of the film. The frame has the characteristics of light weight and high strength, and can be processed by adopting an aluminum alloy material.
Has the advantages that:
1. the invention relates to a gradient film type periodic composite structure, wherein the cell type is gradually changed along one direction, sound insulation can be realized in a plurality of frequency bands, and the sound insulation frequency band is greatly widened.
2. The heavy object is wrapped and sealed by the two films, and compared with the traditional method that the heavy object is adhered to the surfaces of the films, the heavy object has stronger durability, transportability and use convenience.
3. The invention provides two support frames. One is a fixed supporting frame, has no function of adjusting the stress of the film, but is simple to process; the other frame is capable of adjusting the stress of the film, the rotating shaft is arranged at the upper end of the frame, the film can be rolled up, so that tension is applied to the film, the purpose of active regulation is achieved, and the frame has the advantage that the sound insulation effect can be adjusted according to the characteristics of a noise environment.
Drawings
FIG. 1 is a schematic diagram of a gradient film type periodic composite structure of the present invention, wherein the heavy object is a metal particle group;
FIG. 2 is a schematic view of the structure of the weight of FIG. 1;
FIG. 3 is a gradient film type periodic composite structure of the present invention, which is a cylindrical metal plate;
FIG. 4 is a schematic view of the structure of the weight of FIG. 3;
FIG. 5 is a fixed type support frame of the present invention;
FIG. 6 is a supporting frame for adjusting the stress of a thin film according to the present invention;
FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6;
FIG. 8 is a sound insulation array panel constructed in accordance with the present invention;
among them are: the device comprises a film 1, a heavy object 2, a supporting frame 3, a rubber gasket 4, a pulley 5, a rolling shaft 6, a rolling curtain type rolling shaft 7 and a traction rope 8.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Example 1:
as shown in fig. 1: the embodiment is a gradient film type periodic composite structure, which is composed of an elastic film 1, a heavy object 2 and a support frame 3. The elastic film 1 is made of rubber, the elastic film 1 is composed of an upper film and a lower film, and a heavy object 2 is placed between the two films. Then the air between the two films is evacuated, the pressing is further performed to integrate the weight 2 with the film 1, and finally the integrated body is mounted on the supporting frame 3 and tightly fixed. The weights 2 are arranged according to the period of the mass center, namely the period structure can be divided into n square cells with the side length of a, and the center of each square is the position of the mass center of the weight 2. The weight 2 of each row of cells, i.e. in the x-direction, is of the same mass, while the weight 2 of the cells in the y-direction varies in a gradient.
As shown in FIG. 2, the weight 2 is made of iron and is a circular array of metal particles, wherein
Is the thickness of the upper film layer,
is the thickness of the lower film.
As shown in fig. 5: for the fixed type supporting frame 3 of the present invention, the material for making the supporting frame 3 is aluminum alloy, a rubber gasket 4 is arranged between the supporting frame 3 and the elastic film 1, and the three are fixed by an adhesive to form an integral body.
Example 2:
the main structure of this embodiment is the same as that of embodiment 1, except that: as shown in fig. 3 and 4, the weight 2 of the present embodiment is a cylindrical metal thin plate. The radius of the weight 2 is proportionally reduced from bottom to top (namely the y direction), and the weight 2 can be divided into three layers according to whether the size of the radius in the y direction is consistent or not, wherein the radius of the weight 2 in the three rows at the bottommost layer is consistent, the radius of the weight 2 in the four rows at the middle layer is consistent, and the radius of the weight 2 in the four rows at the topmost layer is consistent.
Example 3:
the main structure of this embodiment is the same as that of embodiment 1, except that: as shown in fig. 6: for the supporting frame 3 capable of adjusting the membrane stress, the main body of the supporting frame 3 is made of a material with the thickness of
A left side frame made of a left side aluminum alloy plate having a thickness of
The right side frame made of the aluminum alloy plate is formed, bolt holes 9 are correspondingly formed in the left side frame and the right side frame, and the left side frame and the right side frame are connected and fixed through bolts. The pulley 5 is welded on the frames at the left side and the right side, the elastic film 1 is arranged between the pulleys 5, the lower end of the elastic film 1 is fixed on the rubber gasket 4, and the upper end of the elastic film is fixed on the roller shutter type roller 7 behind the left side frame through the roller 6. The elastic film 1 can be pulled to move upwards by pulling the traction rope 8, so that the stress of the elastic film 1 is adjusted. The right side frame is designed into a 7-shaped frame, so that the frame can be conveniently arranged above the right side frame to form the sound insulation board array. As shown in figure 7, the invention can extend in the x and y directions no matter a fixed frame or a frame capable of adjusting the film stress is adopted, and the sound insulation plate array can be formed by welding or assembling according to the situation, so that the sound insulation plate array is suitable for sound insulation of large-scale fields.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.
Claims (5)
1. A gradient film-type periodic composite structure characterized by: the periodic composite structure comprises an elastic film (1), a heavy object (2) and a support frame (3), wherein the elastic film (1) consists of an upper film and a lower film, the heavy object (2) is placed between the two films, then air between the two films is pumped out, heating and pressing are carried out, so that the heavy object (2) and the film (1) form a whole, and finally the whole is arranged on the support frame (3) and tightened and fixed; the weights (2) are arranged according to the centroid period, namely the periodic structure is divided into n square cells with the side length of a, the center of each square cell is the centroid position of the weight (2), the weights (2) of the square cells in each row in the x direction have the same mass, and the weights (2) of the square cells in the y direction have gradient change; or the mass of the weight (2) of the y-direction square unit cell is the same, and the mass of the weight (2) of the x-direction square unit cell is changed in a gradient manner.
2. A gradient film-type periodic composite structure according to claim 1, characterized in that: the elastic film (1) is made of an elastic material, and the elastic material comprises high-pressure polyethylene, rubber or silicon rubber.
3. A gradient film-type periodic composite structure according to claim 2, characterized in that: the weight (2) is made of metal particles made of iron, lead or copper and is spherical, cylindrical, cubic or cuboid in shape.
4. A gradient film-type periodic composite structure according to claim 3, characterized in that: the metal particles are single particles or particles groups, and when the metal particles are the particles groups, the positions of the centroids of the metal particles are periodically arranged according to the centroids of the metal particles.
5. The gradient film-type periodic composite structure of claim 4, wherein: the supporting frame (3) is a rectangular frame.
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| CN202010761288.XA CN112837667A (en) | 2021-01-11 | 2021-01-11 | A gradient film type periodic composite structure |
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| CN202010761288.XA CN112837667A (en) | 2021-01-11 | 2021-01-11 | A gradient film type periodic composite structure |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103594080A (en) * | 2013-10-25 | 2014-02-19 | 国家电网公司 | A light-weight low-frequency broadband thin-film metamaterial sound insulation device |
| WO2014139323A1 (en) * | 2013-03-12 | 2014-09-18 | The Hong Kong University Of Science And Technology | Sound attenuating structures |
| CN105374348A (en) * | 2015-10-14 | 2016-03-02 | 江苏大学 | Low-frequency ultra-wide-band-gap petal-shaped local resonance acoustic meta-material |
| WO2017033804A1 (en) * | 2015-08-21 | 2017-03-02 | 富士フイルム株式会社 | Soundproofing structure |
| CN212342263U (en) * | 2020-07-31 | 2021-01-12 | 东南大学 | A gradient film type periodic composite structure |
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2021
- 2021-01-11 CN CN202010761288.XA patent/CN112837667A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014139323A1 (en) * | 2013-03-12 | 2014-09-18 | The Hong Kong University Of Science And Technology | Sound attenuating structures |
| CN105122348A (en) * | 2013-03-12 | 2015-12-02 | 香港科技大学 | Noise-absorbing structure |
| CN103594080A (en) * | 2013-10-25 | 2014-02-19 | 国家电网公司 | A light-weight low-frequency broadband thin-film metamaterial sound insulation device |
| WO2017033804A1 (en) * | 2015-08-21 | 2017-03-02 | 富士フイルム株式会社 | Soundproofing structure |
| CN105374348A (en) * | 2015-10-14 | 2016-03-02 | 江苏大学 | Low-frequency ultra-wide-band-gap petal-shaped local resonance acoustic meta-material |
| CN212342263U (en) * | 2020-07-31 | 2021-01-12 | 东南大学 | A gradient film type periodic composite structure |
Non-Patent Citations (1)
| Title |
|---|
| 郭磊;张均东;曾鸿;: "变厚度薄膜型声学超材料单胞的隔声性能数值研究", 舰船科学技术, no. 01, 8 January 2020 (2020-01-08) * |
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