CN112365871A - Local resonance periodic structure with multi-stage vibrator - Google Patents
Local resonance periodic structure with multi-stage vibrator Download PDFInfo
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- CN112365871A CN112365871A CN202011182118.2A CN202011182118A CN112365871A CN 112365871 A CN112365871 A CN 112365871A CN 202011182118 A CN202011182118 A CN 202011182118A CN 112365871 A CN112365871 A CN 112365871A
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- 230000000737 periodic effect Effects 0.000 title claims abstract description 32
- 230000001629 suppression Effects 0.000 claims abstract description 8
- 238000013016 damping Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 13
- 230000001788 irregular Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
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- 238000004088 simulation 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
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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Abstract
The invention belongs to the technical field of vibration noise control, and particularly relates to a local resonance periodic structure with a multi-level vibrator, which comprises an elastic base, a frame, an elastic column and a mass block; the elastic base and the surface integral mass of the elastic base form a primary resonance structure, each elastic column and the mass block on the frame form a plurality of secondary sub-resonance structures, and the structures are periodically arranged on the surface of the structure to be subjected to vibration suppression treatment. Through the resonance of each order of vibrators, the vibration energy is converted into the kinetic energy of each order of vibrators, the vibration energy of the controlled structure is greatly dissipated, and therefore the multi-band vibration control is achieved. The aim is to better adapt to the vibration reduction requirement in engineering by utilizing the multi-mode and broadband design.
Description
Technical Field
The invention belongs to the technical field of vibration noise control, and particularly relates to a local resonance periodic structure with a multi-stage vibrator.
Background
Vibration exists in various fields, and is harmful vibration mostly, and the vibration of instrument equipment not only affects the precision of precision equipment, but also damages the equipment, reduces the normal service life of the equipment, and even directly causes the equipment not to be normally used; vibration generated by large machinery is spread outwards along with the earth surface, and damages are caused to the house walls of factories and nearby residents; the driving of vehicles in cities, urban operation and daily life can generate a large amount of vibration, and citizens are exposed in the environment for a long time, so that the citizens feel bored, the physical fatigue is accelerated, the working efficiency is reduced, and even the health of the citizens is endangered in serious cases. At present, the methods for controlling vibration are widely applied as follows: dynamic vibration absorption, vibration isolation, damping vibration attenuation and the like, however, the control of low-frequency vibration is often difficult to realize due to the limitations of installation process, installation space and the like in the traditional vibration attenuation mode.
The local resonance periodic structure can generate a band gap with relatively low frequency, elastic waves in a band gap range cannot be transmitted, and compared with a traditional vibration reduction mode, the large-wavelength elastic waves can be really controlled by a small-size structure.
Disclosure of Invention
The invention aims to provide a local resonance periodic structure with a multi-order vibrator.
In order to achieve the purpose, the invention adopts the technical scheme that: a local resonance periodic structure with a multi-level vibrator comprises an elastic base, a frame, an elastic column and a mass block. The local resonance periodic structure cell element comprises a two-stage resonance structure, a through hole is formed in a mass block, the shape of the through hole is the same as that of the section of an elastic column, the two sizes of the through hole are the same, the elastic column penetrates through the mass block and is tightly attached to the mass block, a frame is integrally formed by a plurality of side frames, a center column and long frames at the top end and the bottom end, a through hole is formed in each side frame of the frame, a corresponding blind hole is formed in the side face of the frame center column opposite to each side frame, the sizes of the two holes are the same as that of the section of the elastic column, the depth of the blind hole is the same as that of the through hole, a corresponding pair of holes are formed in the same axis, two ends of the elastic column are inserted into one pair of holes to. The frame is fixedly connected to the upper surface of the elastic base to form a primary resonance structure. The elastic base and the elastic column are made of elastic damping materials, and the local resonance periodic structure is periodically arranged on the surface of the structure to be subjected to vibration suppression.
Preferably, the mass block is in the shape of a cylinder, a sphere, a cone and the like.
Preferably, the frame and the mass block are made of high-density, high-modulus and non-deformable materials.
Preferably, the frame may have a plurality of side frames, and a secondary sub-resonant structure may be provided between each side frame and the central column of the frame.
Preferably, the elastic base and each elastic column are made of materials with proper modulus according to the mode of the structure to be damped.
Preferably, the elastic base and each elastic column are made of materials with larger damping under the condition of meeting the modulus requirement.
Preferably, the cross section of the elastic base can be polygonal, circular and irregular.
Preferably, the local resonance periodic structure cells with the multi-level vibrators are arranged on the surface of the structure to be damped at equal intervals, and the arrangement form is not limited and can be simple square, simple hexagonal, simple oblique square and the like.
Based on the band gap theory of the local resonance periodic structure, the local resonance periodic structure can generate a low-frequency band gap, elastic waves cannot be transmitted in the band gap range of the infinite periodic structure, the elastic waves are greatly restrained in the band gap range of the finite periodic structure, the initial frequency of the band gap is related to the elastic parameters of the local resonance cell structure, the width of the band gap is related to the mass ratio and damping of the cell, and the damping has the function of widening the band gap.
The invention has the following beneficial effects: on one hand, in the structure of the local resonance periodic structure cell with the multi-stage vibrator, the elastic base and the frame form a primary resonance structure, and the elastic columns and the mass blocks in the frame form a plurality of secondary sub-resonance structures, so that the local resonance periodic structure cell has abundant vibration modes and can realize vibration suppression of a plurality of frequency bands; on the other hand, the resonance frequency of the secondary sub-resonance structures can be adjusted to be close, a plurality of narrow low-frequency vibration suppression band gaps are integrated into a wide-frequency band gap through the damping effect of the material of the elastic column, the low-frequency vibration suppression performance is effectively improved, the elastic base with high damping is attached to the surface of the structure to be controlled, and the damping effect on the medium-frequency and high-frequency vibration is very good. The invention has simple structure, convenient installation and batch production.
Drawings
FIG. 1 is a schematic diagram of a local resonant periodic structure cell with multiple secondary oscillators according to the present invention;
FIG. 2 is a schematic diagram of a primary resonance structure of a local resonance periodic structure according to the present invention;
FIG. 3 is a schematic diagram of a secondary sub-resonance structure of the local resonance periodic structure according to the present invention;
FIG. 4 is a schematic diagram of a homogeneous plate with attached local resonance periodic structure array of the present invention having a multi-order vibrator;
FIG. 5 is a schematic illustration of the vibration damping effect of the embodiment shown in FIG. 4;
in the figure: 1-elastic base, 2-frame, 21-short frame, 22-central column, 23-long frame, 24-through hole, 25-blind hole, 3-elastic column and 4-mass block
Detailed Description
The embodiments of the present invention will be further described with reference to the drawings in the following, and it should be understood that the described embodiments are only one embodiment of the present invention. Other embodiments, which can be obtained by other persons skilled in the art without any inventive work, based on the embodiments of the present invention, belong to the protection scope of the present invention.
As shown in fig. 1, which is a schematic view of a local resonance periodic structure cell with a multi-level oscillator of the present invention, a through hole is provided inside a mass block (4), the shape of the through hole is the same as the cross-sectional shape of an elastic column (3), and the sizes of the through hole and the elastic column are the same, the elastic column (3) penetrates through the mass block (4) and is tightly attached to the mass block (4), a frame (2) is integrally formed by a plurality of side frames (21), a central column (22) and long frames (23) at the top end and the bottom end, a through hole (24) is provided on each side frame of the frame, a corresponding blind hole (25) is provided on the side of the frame central column (22) opposite to each side frame (21), the sizes of the two holes are the same as the cross-sectional size of the elastic column (3), the depth of the blind hole (25) is the same as the through hole (24), a, transversely hung in the frame (2), and each elastic column (3) and the mass block (4) arranged on the elastic column form a secondary sub-resonance structure. The frame (2) is fixedly connected to the upper surface of the elastic base (1) to form a primary resonance structure. The elastic base (1) and the elastic column (3) are made of elastic damping materials, and the local resonance periodic structure is periodically arranged on the surface of the structure to be subjected to vibration suppression.
The frame (2) can be provided with a plurality of side frames (21), a secondary sub-resonance structure can be arranged between each side frame (21) and the frame central column (22), and the figure only illustrates the condition when the number of the side frames (21) is 4.
The section of the elastic base (1) can be polygonal, circular or irregular. The figure only shows the situation when the section of the elastic base (1) is quadrangular.
Preferably, the elastic base (1), the frame (2) and the elastic column (3) are of a symmetrical structure.
Preferably, the frame (2) and the mass block (4) are used as vibrators of the primary and secondary sub-resonance structures and made of high-density and high-modulus materials, and the shapes of cylinders, spheres and the like are selected to ensure the stability of the structure when the mass block (4) vibrates.
Preferably, the elastic base (1) and the elastic columns (3) at all levels provide rigidity, and are made of elastic damping materials, and rubber materials with larger damping are selected for obtaining a better damping effect.
The invention is composed of a plurality of resonance structures in series-parallel connection, as shown in fig. 2 and fig. 3, an elastic base (1) and a frame (2) form a primary resonance structure, an elastic column (3) and a mass block (4) in the frame (2) form a plurality of secondary sub-resonance structures, and the secondary sub-resonance structures have abundant vibration modes, and the vibration of a vibrator can dissipate the vibration energy of a controlled structure, so that a plurality of low-frequency band gaps can be generated.
When the controlled structure vibrates transversely, the elastic waves are transmitted to the local resonance structure from the controlled structure to cause the vibration of the frame (2) so as to drive the vibration of each secondary mass block (4), the frame (2) and the mass blocks (4) resonate at each order of natural frequency of the structure, so that the vibration energy is converted into the kinetic energy of the frame (2) and the mass blocks (4), the vibration energy of the controlled structure is greatly dissipated, the vibration is localized in the first cells, and the vibration response of the controlled structure is reduced.
FIG. 4 is a schematic diagram of the installation of the present invention in vibration suppression, wherein n structures of the present invention (only 9 structures are attached in the figure) are periodically attached to the uniform plate, the uniform plate is divided into n cells, each cell is attached with one structure of the present invention, appropriate parameters are set, and simulation analysis of vibration response is performed under the excitation of given specific force, as shown in FIG. 5, the vibration response comparison curves before and after the addition of the present invention are shown, and it can be seen from the graph that, in the frequency range of the band gap, the vibration response of the substrate plate is significantly reduced, and the starting frequency of the first band gap is as low as below 100 Hz.
Claims (8)
1. A local resonance periodic structure with a multi-order vibrator is characterized in that: a through hole is arranged in the mass block (4), the shape of the through hole is the same as the shape of the section of the elastic column (3), the sizes of the through hole and the elastic column are the same, the elastic column (3) penetrates through the mass block (4), the elastic column is tightly attached to the mass block (4), the frame (2) is formed by integrally forming a plurality of side frames (21), a center column (22) and long frames (23) at the top end and the bottom end, a through hole (24) is formed in each side frame (21) of the frame (2), a corresponding blind hole (25) is formed in the side face of the frame center column (22) opposite to each side frame (21), the size of each blind hole is consistent with the size of the cross section of the elastic column (3), the depth of each blind hole (25) is consistent with that of the through hole (24), the corresponding pair of blind holes are located on the same axis, two ends of the elastic column (3) are inserted into one pair of holes to enable the two ends of the elastic column to be fixed and are transversely hung in the frame (2), and each elastic column (3) and the mass block (4) arranged on the elastic. The frame (2) is fixedly connected to the upper surface of the elastic base (1) to form a primary resonance structure. The elastic base (1) and the elastic column (3) are made of elastic damping materials, and the local resonance periodic structure is periodically arranged on the surface of the structure to be subjected to vibration suppression.
2. The periodic structure of local resonance with a multiorder vibrator of claim 1, wherein: the mass block (4) is in the shape of a cylinder, a sphere, a cone and the like.
3. The periodic structure of local resonance with a multiorder vibrator of claim 1, wherein: the frame (2) and the mass block (4) are made of high-density, high-modulus and non-deformable materials.
4. The periodic structure of local resonance with a multi-order vibrator according to claim 1, wherein: the frame (2) can be provided with a plurality of side frames (21), and a secondary sub-resonance structure can be arranged between each side frame (21) and the frame central column (22).
5. The periodic structure of local resonance with a multiorder vibrator of claim 1, wherein: the elastic base (1) and each elastic column (3) are made of materials with proper modulus according to the mode of the structure to be damped.
6. The periodic structure of local resonance with a multiorder vibrator of claim 1, wherein: the elastic base (1) and each elastic column (3) are made of materials with larger damping under the condition of meeting the modulus requirement.
7. The periodic structure of local resonance with a multiorder vibrator of claim 1, wherein: the section of the elastic base (1) can be polygonal, circular or irregular.
8. The periodic structure of local resonance with a multi-order vibrator according to claim 1, wherein: the local resonance periodic structure cells with the multi-stage vibrators are arranged on the surface of the structure to be suppressed at equal intervals, and the arrangement form is not limited and can be simple square, simple hexagonal, simple orthorhombic and the like.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011182118.2A CN112365871B (en) | 2020-10-29 | 2020-10-29 | Local resonance periodic structure with multistage vibrators |
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| CN202011182118.2A CN112365871B (en) | 2020-10-29 | 2020-10-29 | Local resonance periodic structure with multistage vibrators |
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| CN112365871A true CN112365871A (en) | 2021-02-12 |
| CN112365871B CN112365871B (en) | 2024-04-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114370474A (en) * | 2021-12-31 | 2022-04-19 | 中国舰船研究设计中心 | Frequency conversion phononic crystal vibration suppression device for structure |
| US11862137B2 (en) * | 2021-03-16 | 2024-01-02 | Hyundai Motor Company | Device for reducing vibration |
Citations (4)
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|---|---|---|---|---|
| CN103996396A (en) * | 2014-05-29 | 2014-08-20 | 西安交通大学 | Light two-component soft thin layer local resonance acoustic material structure |
| US20180340328A1 (en) * | 2016-02-04 | 2018-11-29 | Mitsubishi Chemical Corporation | Sound insulation sheet member and sound insulation structure using same |
| CN109441983A (en) * | 2018-12-03 | 2019-03-08 | 南京航空航天大学 | A kind of lattice structure with isolation characteristics |
| CN110751937A (en) * | 2019-11-13 | 2020-02-04 | 中国人民解放军国防科技大学 | High-rigidity high-damping local resonance unit for constructing acoustic metamaterial structure |
-
2020
- 2020-10-29 CN CN202011182118.2A patent/CN112365871B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103996396A (en) * | 2014-05-29 | 2014-08-20 | 西安交通大学 | Light two-component soft thin layer local resonance acoustic material structure |
| US20180340328A1 (en) * | 2016-02-04 | 2018-11-29 | Mitsubishi Chemical Corporation | Sound insulation sheet member and sound insulation structure using same |
| CN109441983A (en) * | 2018-12-03 | 2019-03-08 | 南京航空航天大学 | A kind of lattice structure with isolation characteristics |
| CN110751937A (en) * | 2019-11-13 | 2020-02-04 | 中国人民解放军国防科技大学 | High-rigidity high-damping local resonance unit for constructing acoustic metamaterial structure |
Non-Patent Citations (1)
| Title |
|---|
| 马建刚;盛美萍;韩玉迎;: "多带隙局域共振单元抑振设计与实验验证", 振动工程学报, no. 06, 15 December 2019 (2019-12-15) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11862137B2 (en) * | 2021-03-16 | 2024-01-02 | Hyundai Motor Company | Device for reducing vibration |
| CN114370474A (en) * | 2021-12-31 | 2022-04-19 | 中国舰船研究设计中心 | Frequency conversion phononic crystal vibration suppression device for structure |
| CN114370474B (en) * | 2021-12-31 | 2023-12-05 | 中国舰船研究设计中心 | Variable-frequency phonon crystal vibration suppression device for structure |
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| CN112365871B (en) | 2024-04-12 |
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