CN117515106A - Flat vibration isolation device embedded with acoustic black hole vibration absorption structure - Google Patents
Flat vibration isolation device embedded with acoustic black hole vibration absorption structure Download PDFInfo
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- CN117515106A CN117515106A CN202311492342.5A CN202311492342A CN117515106A CN 117515106 A CN117515106 A CN 117515106A CN 202311492342 A CN202311492342 A CN 202311492342A CN 117515106 A CN117515106 A CN 117515106A
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- Prior art keywords
- black hole
- acoustic black
- vibration
- acoustic
- hole structure
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- 238000002955 isolation Methods 0.000 title claims abstract description 31
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 20
- 238000004080 punching Methods 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 abstract description 10
- 230000035939 shock Effects 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 4
- 230000001133 acceleration Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004630 mental health Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Building Environments (AREA)
Abstract
The invention discloses a panel vibration isolation device embedded with an acoustic black hole vibration absorption structure, which comprises an upper uniform panel, wherein four corners of the uniform panel are connected with a bottom panel through bolts; the bottom plate comprises a plurality of embedded shock absorption structures based on the acoustic black hole effect and the local resonance principle; the vibration absorbing structure consists of a frame with the same thickness as the uniform plate, a connecting curved beam and an acoustic black hole structure, and is connected with the curved beam by punching holes on the acoustic black hole structure; the acoustic black hole structure is an axisymmetric structure, and the suitable vibration absorption frequency is selected by adjusting the length or the maximum thickness of the acoustic black hole structure. According to the invention, vibration energy is gathered at the tip of the structure by utilizing the absorption effect of the acoustic black hole structure on bending waves, so that the propagation of vibration to an upper uniform flat plate is reduced, and a good vibration isolation effect of a low-frequency broadband is realized.
Description
Technical Field
The invention relates to the technical field of structural vibration isolation, in particular to a flat plate vibration isolation device embedded into an acoustic black hole vibration absorption structure.
Background
The vibration problem of structure is ubiquitous in engineering field, and harmful structural vibration not only can influence the precision and the life of equipment, can also be unfavorable to equipment operating personnel's physical and mental health. Among them, the thin plate structure is a very common mechanical member and has a wide application in industrial fields, such as a skin structure for a car of a high-speed train and various aircraft ships. In large engineering equipment, such thin plate structures typically operate in low frequency bands and include multi-order resonances, while conventional vibration isolation approaches are difficult to meet the broadband vibration isolation requirements.
Vibration isolation can be divided into active vibration isolation and passive vibration isolation, and the bottom of the plate structure is mainly subjected to random or simple harmonic excitation, so that the passive vibration isolation is needed.
The acoustic black hole is a novel concept which is proposed in recent years and can realize the passive control of vibration, and the periodic structure designed by utilizing the acoustic black hole effect has the advantages of wide-frequency vibration reduction and vibration isolation. The acoustic black hole concept is analogized from the black hole concept of celestial physics by changing the geometric parameters or material properties of the structure according to the power law to achieve bending wave concentration. Ideally, the propagation speed of the bending wave at the tail end of the acoustic black hole structure is reduced to zero, so that wave reflection does not occur, and efficient vibration absorption is realized. However, the conventional acoustic black hole structure mainly suppresses the vibration of the high frequency band in the main structure, and is not suitable for vibration reduction and isolation of the large thin plate.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the panel vibration isolation device embedded with the acoustic black hole vibration absorption structure, and the vibration is gathered at the end part of the acoustic black hole structure by embedding a plurality of vibration absorption structures containing acoustic black hole elements in a bottom panel, so that the propagation to an upper panel is reduced. The invention enables the acoustic black hole structure to be used as a resonance unit at the same time, and the vibration reduction and isolation requirements of low frequency and broadband are considered based on the local resonance principle.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the invention relates to a panel vibration isolation device embedded with an acoustic black hole vibration absorption structure, which comprises an upper uniform panel, wherein four corners of the uniform panel are connected with a bottom panel through bolts; the bottom plate comprises a plurality of embedded shock absorption structures based on the acoustic black hole effect and the local resonance principle;
the vibration absorbing structure comprises a frame with the same thickness as the uniform plate, a connecting curved beam and an acoustic black hole structure;
the acoustic black hole structure is an axisymmetric structure and comprises a constant section and a variable section, the acoustic black hole structure is contracted from the middle part to the two ends, and the suitable vibration absorption frequency is selected by adjusting the length or the maximum thickness of the acoustic black hole structure.
Preferably, the connection to the curved beam is made by punching holes in the acoustic black hole structure.
Preferably, the maximum thickness of the acoustic black hole structure is 3-5 times of the edge thickness of the acoustic black hole structure.
Preferably, the upper layer uniform flat plate, the uniform part of the bottom layer flat plate and the connecting curved beam of the shock absorbing structure are made of polyester fibers; the acoustic black hole structure is made of rubber.
Compared with the prior art, the invention has the following beneficial effects:
the vibration absorption structure based on the acoustic black hole effect and the local resonance principle provided by the invention has the capability of vibration absorption in a low frequency band when being used as a local oscillator; meanwhile, vibration energy is gathered at the end part of the acoustic black hole structure by utilizing the absorption effect of the acoustic black hole on bending waves, so that the propagation of vibration to an upper-layer flat plate is reduced; the excellent effect of low-frequency broadband vibration isolation can be achieved by combining the two points.
According to the invention, efficient vibration isolation can be realized through the periodic arrangement of a few vibration absorbing structures, and the embedding positions and arrangement modes of the vibration absorbing structures in the bottom flat plate can be flexibly designed; the hollow design can give consideration to the effectiveness and light weight of the device, and the whole device is convenient to process and simple to assemble.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a top view of a shock absorbing structural unit according to the present invention;
FIG. 3 is a side view of an acoustic black hole structure of the present invention;
FIG. 4 is a schematic diagram of the variation of the cross-sectional thickness of an acoustic black hole structure according to the present invention;
fig. 5 is a graph comparing vibration isolation characteristics of the present invention with reference results.
Reference numerals illustrate:
1. an upper plate; 2. a connecting bolt; 3. a bottom plate; 4. a shock absorbing structure; 4-1, a frame; 4-2, connecting a curved beam; 4-3, an acoustic black hole structure; 4-3-1, an acoustic black hole structure constant section; 4-3-2, the section of the acoustic black hole structure becomes cross section.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, the invention provides a panel vibration isolation device embedded with an acoustic black hole vibration absorption structure, which comprises an upper uniform panel 1, four corners of the upper uniform panel are connected with a bottom panel 3 through connecting bolts 2, and a plurality of vibration absorption structures 4 are embedded in the bottom panel 3. Wherein the number of the shock absorbing structures 4 and the distribution thereof on the bottom flat plate 3 can be flexibly set according to actual needs.
As shown in fig. 2, the shock absorbing structure 4 includes a frame 4-1 having the same thickness as the underlying flat plate 3, a connecting curved beam 4-2, and an acoustic black hole structure 4-3. Is connected with the curved beam 4-2 by punching holes on the acoustic black hole structure 4-3.
As shown in FIG. 3, the acoustic black hole structure 4-3 is an axisymmetric structure and is divided into a constant section 4-3-1 and a variable section 4-3-2, and the acoustic black hole structure is contracted from the middle to the two ends. In this embodiment, the thickness of the constant section 4-3-1 is 4 times the thickness of the edge of the variable section 4-3-2.
As shown in fig. 4, the single-sided thickness h of the variable section 4-3-2 of the acoustic black hole structure 4-3 satisfies the following relationship:
wherein x is the distance from the left end edge of the acoustic black hole structure 4-3; x is x 1 Is the distance from the left end edge of the acoustic black hole structure 4-3 to the maximum thickness of the acoustic black hole structure 4-3; x is x 2 The distance from the left end edge of the acoustic black hole structure 4-3 to the symmetry axis of the middle part; h is a 1 The thickness of the edge of the acoustic black hole structure 4-3; h is a 2 The maximum thickness of the acoustic black hole structure 4-3; epsilon is the slope of the section of the acoustic black hole>0; m is the acoustic black hole order, and m is more than or equal to 2 and less than or equal to 3. By adjusting the structural parameters of the acoustic black hole structure 4-3, the starting frequency of the acoustic black hole effect to play a role in absorbing vibration can be changed.
In the embodiment, the upper uniform flat plate 1, the uniform part of the bottom flat plate 3, the frame 4-1 of the shock absorbing structure 4 and the connecting curved beam 4-2 are made of polyester fibers; the acoustic black hole structure 4-3 is made of rubber.
As shown in fig. 5, the vibration isolation effectiveness of the present device was verified by calculating acceleration signals at corresponding points on the upper-layer flat plate 1 and the lower-layer flat plate 3 when the lower-layer flat plate 3 was excited. Firstly, a model of the device is built in finite element simulation software Comsol Multiphysics 6.0.0 as a comparison, and meanwhile, a vibration isolation device model with a bottom flat plate being a uniform flat plate and the rest being unchanged is built. By applying a surface excitation of 1N total force to the underlying plate 3, respectively, the acceleration response of the center points of the underlying plate 3 and the upper uniform plate 1 in the range of 0-150Hz was calculated, and 20lg (a out /a in ) The ordinate of fig. 5, i.e., the vibration transmissivity, can be obtained; wherein a is in Acceleration amplitude, a, of the center point of the upper uniform flat plate 1 out Is the acceleration amplitude of the center point of the bottom plate 3. As can be seen from FIG. 5, in the vibration isolation device embedded with the acoustic black hole vibration absorbing structure according to the embodiment of the present invention, the frequency range with the vibration transmission rate smaller than 0 is wider than that of the comparison device by more than 20Hz, and the trough value of the vibration transmission rate of the device is compared with that of the comparison device in the vibration isolation frequency rangeAnd less than 20dB. The device has more remarkable wide low-frequency vibration isolation effect by comprehensive comparison.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof, but rather, any modification, equivalent replacement, improvement or the like which comes within the spirit and principles of the present invention are contemplated to be within the scope of the present invention.
Claims (5)
1. The flat plate vibration isolation device embedded with the acoustic black hole vibration absorption structure is characterized by comprising an upper layer uniform flat plate (1), a bottom layer flat plate (3), bolts (2) for connecting the two layers of flat plates and a vibration absorption structure (4) embedded in the bottom layer flat plate; the vibration absorbing structure (4) comprises a frame (4-1) with the same thickness as the bottom flat plate, two symmetrically arranged connecting curved beams (4-2) and an acoustic black hole structure (4-3) arranged in the middle; and the acoustic black hole structure (4-3) is connected with the curved beam (4-2) through punching.
2. The panel vibration isolation device embedded with the acoustic black hole vibration absorbing structure according to claim 1, wherein the vibration absorbing structure (4) is arranged in the center of the bottom panel (3) by four identical unit structures in two rows and two columns periodically.
3. The flat vibration isolation device embedded with the acoustic black hole vibration absorbing structure according to claim 1, wherein the acoustic black hole structure (4-3) is an axisymmetric structure, and is contracted from the middle part to the two ends.
4. The flat vibration isolation device embedded with the acoustic black hole vibration absorbing structure according to claim 1, wherein the connecting curved beam (4-2) is a half I-shaped beam and is symmetrically arranged by taking the symmetry axis in the middle of the frame (4-1) as an axis.
5. A flat vibration isolation device embedded with an acoustic black hole vibration absorbing structure according to claim 3, wherein the acoustic black hole structure (4-3) comprises a constant section (4-3-1) and a variable section (4-3-2), and the single-side thickness h thereof satisfies the following relationship:
wherein x is the distance from the left end edge of the acoustic black hole structure (4-3); x is x 1 The distance from the left end edge of the acoustic black hole structure (4-3) to the maximum thickness of the acoustic black hole; x is x 2 Is the distance from the left edge of the acoustic black hole structure (4-3) to the symmetry axis of the middle part; h is a 1 Is the edge thickness of the acoustic black hole structure (4-3); h is a 2 Is the maximum thickness of the acoustic black hole structure (4-3); epsilon is the slope of the section of the acoustic black hole>0; m is the acoustic black hole order.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311492342.5A CN117515106A (en) | 2023-11-10 | 2023-11-10 | Flat vibration isolation device embedded with acoustic black hole vibration absorption structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311492342.5A CN117515106A (en) | 2023-11-10 | 2023-11-10 | Flat vibration isolation device embedded with acoustic black hole vibration absorption structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117515106A true CN117515106A (en) | 2024-02-06 |
Family
ID=89760148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311492342.5A Pending CN117515106A (en) | 2023-11-10 | 2023-11-10 | Flat vibration isolation device embedded with acoustic black hole vibration absorption structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117515106A (en) |
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2023
- 2023-11-10 CN CN202311492342.5A patent/CN117515106A/en active Pending
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