CN110594331A - Hierarchical periodic structure metamaterial beam suitable for multi-frequency-band vibration reduction - Google Patents
Hierarchical periodic structure metamaterial beam suitable for multi-frequency-band vibration reduction Download PDFInfo
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- CN110594331A CN110594331A CN201910888848.5A CN201910888848A CN110594331A CN 110594331 A CN110594331 A CN 110594331A CN 201910888848 A CN201910888848 A CN 201910888848A CN 110594331 A CN110594331 A CN 110594331A
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- local oscillator
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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
- F16F7/00—Vibration-dampers; Shock-absorbers
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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
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/04—Frequency effects
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- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a metamaterial beam with a hierarchical periodic structure suitable for multi-band vibration reduction, which aims to solve the problem of unsatisfactory vibration reduction effect in engineering application or vibration tests. The invention can not only verify theory and simulation results, but also be widely applied to engineering and life, has very obvious vibration reduction effect, and can meet the requirements of vibration reduction and performance optimization under multiple frequency bands.
Description
Technical Field
The invention relates to a metamaterial beam, in particular to a hierarchical periodic structure metamaterial beam suitable for multi-band vibration reduction, and belongs to the technical field of mechanical vibration and noise control.
Background
The construction method has the advantages that the actual engineering production often encounters certain vibration troubles, the construction is greatly influenced by certain vibration in the construction process, and great potential safety hazards exist. The metamaterial beam refers to a beam body which is designed by using materials with certain characteristics or special structures which are artificially manufactured, and is mainly applied to vibration tests and engineering vibration reduction.
Disclosure of Invention
The invention aims to solve the problem that the vibration reduction effect is not ideal in engineering application or vibration test, and further provides a hierarchical periodic structure metamaterial beam suitable for multi-band vibration reduction.
The technical scheme adopted by the invention for solving the problems is as follows:
it includes the foundation beam, the foundation beam is the rectangular plate body, a hierarchical periodic structure metamaterial beam suitable for multifrequency section damping still includes the first additional local oscillator structure of multiunit and the additional local oscillator structure of a plurality of seconds, and the first additional local oscillator structure of multiunit and the additional local oscillator structure of a plurality of seconds are installed at the lower surface of foundation beam by the one end of foundation beam to the other end is crisscross, and the first additional local oscillator structure of every group comprises two first additional local oscillator structures.
Further, the height of the vertical plate of the second additional local oscillator structure is not less than that of the vertical plate of the first additional local oscillator structure.
Further, the distance between every two adjacent first additional local oscillator structures is (A), the distance between the first additional local oscillator structure and the adjacent second additional local oscillator structure is (B), and the A and the B are equal.
Further, first additional local oscillator structure includes first L shape plate body, first crossbeam, two first C type presss from both sides and two first bolts, the lower fixed surface of the upper end of first L shape plate body and first crossbeam is connected, two first C type presss from both sides and sets up the left and right sides at first crossbeam relatively, and the lower extreme that every first C type pressed from both sides all links into an integrated entity with what first crossbeam, and the upper end that every first C type pressed from both sides is equipped with a screw, and first bolt cartridge is in the screw.
Further, the second additional local oscillator structure comprises a second L-shaped plate body, a second cross beam, two second C-shaped clamps and two second bolts, the upper end of the second L-shaped plate body is fixedly connected with the lower surface of the second cross beam, the two second C-shaped clamps are oppositely arranged on the left side and the right side of the second cross beam, the lower end of each second C-shaped clamp is connected with one end of the second cross beam into a whole, a screw hole is formed in the upper end of each second C-shaped clamp, and the second bolts are inserted into the screw holes.
Further, the first L-shaped plate body, the first cross beam and the two first C-shaped clamps are integrally formed; the second L-shaped plate body, the second cross beam and the two second C-shaped clamps are integrally formed.
Further, the vertical plate height of the second L-shaped plate body is 1.5 to 3 times that of the first L-shaped plate body.
The invention has the beneficial effects that:
the metamaterial beam disclosed by the invention can keep the excellent characteristics of the original periodic structure through multiple phases, and the vibration damping frequency band is wider and the vibration damping effect is stronger through the design of the first additional local oscillator structure and the plurality of second additional local oscillator structures by introducing the domain resonance thought. Because the multi-frequency-band vibration reduction of one structure can be realized by the grading period, the frequency range of vibration reduction can be enlarged, and the vibration reduction effect is better;
the invention can not only verify theory and simulation results, but also be widely applied to engineering and life, has very obvious vibration reduction effect, and can meet the requirements of vibration reduction and performance optimization under multiple frequency bands;
the invention has simple structure and low cost, the test piece is made by mechanical processing means, and the required materials are common materials, thus the cost is low and the expenditure is saved for scientific research.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention; FIG. 2 is a front view of FIG. 1;
FIG. 3 is a left side view of FIG. 2; FIG. 4 is a right side view of FIG. 2;
FIG. 5 is a top view of FIG. 2; FIG. 6 is a schematic diagram of a first additional local oscillator structure;
fig. 7 is a schematic diagram of a second additional local oscillator structure.
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 7, and the graded periodic structure metamaterial beam suitable for multi-band vibration damping according to the present embodiment includes a foundation beam 1, where the foundation beam 1 is a rectangular plate, and is characterized in that: the hierarchical periodic structure metamaterial beam suitable for multi-band vibration reduction further comprises a plurality of groups of first additional local oscillator structures 2 and a plurality of second additional local oscillator structures 3, the plurality of groups of first additional local oscillator structures 2 and the plurality of second additional local oscillator structures 3 are installed on the lower surface of the base beam 1 from one end to the other end of the base beam 1 in a staggered mode, and each group of first additional local oscillator structures 2 is composed of two first additional local oscillator structures 2.
The metamaterial beam provided by the invention is mainly applied to vibration tests and engineering vibration reduction, can be used for seismic resistance in buildings, and can also be placed in platforms with requirements on vibration reduction performance. Through the Bragg scattering of the structural characteristics of the fiber bragg grating and the local resonance principle, the fiber bragg grating has the effect of weakening vibration at a certain frequency. The first additional local oscillator structure 2 and the second additional local oscillator structure 3 are sleeved on the foundation beam 1 according to sequence and certain intervals, nuts are screwed respectively to fix after the determined intervals are kept consistent, when parameters (the length and the thickness of a vertical plate and a transverse plate of an L-shaped plate body) of the first additional local oscillator structure 2 and the second additional local oscillator structure 3 are determined, the positions of vibration band gaps can be changed by changing the intervals, and when the intervals of all the additional local oscillator structures are determined, the positions of the band gaps can be changed by designing different size parameters of the local oscillator structures. In order to achieve the convenience of experiment, the position of the local oscillator structure can be freely adjusted, the device is convenient to install and easy to adjust, all materials used for manufacturing are common materials, the manufacturing cost is low, the processing is simple and easy to achieve, the metamaterial beam structure not only can provide correct basis for verifying simulation and experiment results, but also can be widely applied to engineering and life, has very obvious vibration reduction effect, and can meet requirements of vibration reduction under multiple frequency bands and performance optimization.
The second embodiment is as follows: in the present embodiment, the riser height of the second additional local oscillator structure 3 is not less than the riser height of the first additional local oscillator structure 2, which is described with reference to fig. 2 and 3. By the arrangement, more band gaps can be generated, and a better vibration reduction effect is achieved.
Other components and connections are the same as those in the first embodiment.
The third concrete implementation mode: in the present embodiment, the distance between every two adjacent first additional local oscillator structures 2 is a, the distance between the first additional local oscillator structure 2 and the adjacent second additional local oscillator structure 3 is B, and a and B are equal to each other. By the arrangement, multi-frequency-band vibration reduction of one structure can be realized, the frequency range of vibration reduction can be enlarged, and a good vibration reduction effect can be obtained. Other components may be connected in the same manner as in one or both embodiments.
The fourth concrete implementation mode: the first additional local oscillator structure 2 of the present embodiment is described with reference to fig. 6, and includes a first L-shaped plate body 2-1, a first beam 2-2, two first C-shaped clamps 2-3, and two first bolts 2-4, where an upper end of the first L-shaped plate body 2-1 is fixedly connected to a lower surface of the first beam 1, the two first C-shaped clamps 2-3 are oppositely disposed on left and right sides of the first beam 1, a lower end of each first C-shaped clamp 2-3 is integrally connected to the first beam 1, an upper end of each first C-shaped clamp 2-3 is provided with a screw hole, and the first bolt 2-4 is inserted into the screw hole.
The upper end of the first C-shaped clamp 2-3 is located on the upper surface of the cross beam 1, the lower end of the first C-shaped clamp 2-3 is located on the lower surface of the cross beam 1, and the bolt sequentially penetrates through the upper end of the first C-shaped clamp 2-3 and the cross beam 1 and then is screwed and fixed. Through the design of the first bolts 2-4, the local oscillator can be conveniently disassembled and assembled, and the effect of different positions can be realized.
Other components and connection relationships are the same as those in the first, second or third embodiment.
The fifth concrete implementation mode: the second additional local oscillator structure 3 of the present embodiment is described with reference to fig. 7, and includes a second L-shaped plate body 3-1, a second beam 3-2, two second C-shaped clips 3-3, and two second bolts 3-4, where the upper end of the second L-shaped plate body 3-1 is fixedly connected to the lower surface of the second beam 1, the two second C-shaped clips 3-3 are oppositely disposed on the left and right sides of the second beam 1, the lower end of each second C-shaped clip 3-3 is integrally connected to one end of the second beam 1, the upper end of each second C-shaped clip 3-3 is provided with a screw hole, and the second bolt 3-4 is inserted into the screw hole.
The upper end of the second C-shaped clamp 3-3 is located on the upper surface of the cross beam 1, the lower end of the second C-shaped clamp 3-3 is located on the lower surface of the cross beam 1, and the bolt sequentially penetrates through the upper end of the second C-shaped clamp 3-3 and the cross beam 1 and then is screwed and fixed.
Rigid displacement exists between the foundation beam and the local oscillator structure; through the design of the second bolts 3-4, the local oscillator is convenient to disassemble and assemble, and the effect of different positions can be achieved. Other components and connections are the same as those of the first, second, third or fourth embodiments.
The sixth specific implementation mode: the first L-shaped plate body 2-1, the first cross member 2-2, and the two first C-shaped clamps 2-3 according to the present embodiment are integrally formed, as described with reference to fig. 6 and 7; the second L-shaped plate body 3-1, the second cross beam 3-2 and the two second C-shaped clamps 3-3 are integrally formed. The first local oscillator structure 2 and the second local oscillator structure 3 are integrally formed, so that the accuracy of an experiment is guaranteed, the operation is very simple and convenient, the assembly experiment can be completed by a single person, and great convenience is brought to the experiment.
Other components and connection relationships are the same as those in the first, second, third, fourth or fifth embodiment.
The seventh embodiment: referring to fig. 2 and 3, the riser height of the second L-shaped plate 3-1 of the present embodiment is 1.5 to 3 times the riser height of the first L-shaped plate 2-1. By the arrangement, more band gaps can be generated, and a better vibration reduction effect is achieved.
Other components and connection relationships are the same as those in the first, second, third, fourth, fifth or sixth embodiment.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a hierarchical periodic structure metamaterial beam suitable for multifrequency section damping, it includes foundation beam (1), foundation beam (1) is the rectangular plate body, its characterized in that: the hierarchical periodic structure metamaterial beam suitable for multi-band vibration reduction further comprises a plurality of groups of first additional local oscillator structures (2) and a plurality of second additional local oscillator structures (3), the groups of the first additional local oscillator structures (2) and the second additional local oscillator structures (3) are installed on the lower surface of the base beam (1) from one end to the other end of the base beam (1) in a staggered mode, and each group of the first additional local oscillator structures (2) is composed of two first additional local oscillator structures (2).
2. The graded periodic structure metamaterial beam suitable for multiband vibration damping according to claim 1, wherein: the vertical plate height of the second additional local oscillator structure (3) is not less than that of the first additional local oscillator structure (2).
3. The graded periodic structure metamaterial beam suitable for multiband damping according to claim 1 or 2, wherein: the distance between every two adjacent first additional local oscillator structures (2) is (A), the distance between the first additional local oscillator structure (2) and the adjacent second additional local oscillator structure (3) is (B), and the A and the B are equal.
4. The graded periodic structure metamaterial beam suitable for multiband vibration damping according to claim 3, wherein: the first additional local oscillator structure (2) comprises a first L-shaped plate body (2-1), a first cross beam (2-2), two first C-shaped clamps (2-3) and two first bolts (2-4), the upper end of the first L-shaped plate body (2-1) is fixedly connected with the lower surface of the first cross beam (1), the two first C-shaped clamps (2-3) are oppositely arranged on the left side and the right side of the first cross beam (1), the lower end of each first C-shaped clamp (2-3) is integrally connected with the first cross beam (1), a screw hole is formed in the upper end of each first C-shaped clamp (2-3), and the first bolts (2-4) are inserted into the screw holes.
5. The graded periodic structure metamaterial beam suitable for multiband vibration damping according to claim 2, wherein: the second additional local oscillator structure (3) comprises a second L-shaped plate body (3-1), a second cross beam (3-2), two second C-shaped clamps (3-3) and two second bolts (3-4), the upper end of the second L-shaped plate body (3-1) is fixedly connected with the lower surface of the second cross beam (1), the two second C-shaped clamps (3-3) are oppositely arranged on the left side and the right side of the second cross beam (1),
the lower end of each second C-shaped clamp (3-3) is connected with one end of the second cross beam (1) into a whole, the upper end of each second C-shaped clamp (3-3) is provided with a screw hole, and a second bolt (3-4) is inserted into the screw hole.
6. A graded periodic structure metamaterial beam suitable for multiband damping according to claim 4 or 5, wherein: the first L-shaped plate body (2-1), the first cross beam (2-2) and the two first C-shaped clamps (2-3) are integrally formed; the second L-shaped plate body (3-1), the second cross beam (3-2) and the two second C-shaped clamps (3-3) are integrally formed.
7. The graded periodic structure metamaterial beam suitable for multiband vibration damping according to claim 6, wherein: the height of the vertical plate of the second L-shaped plate body (3-1) is 1.5 to 3 times that of the vertical plate of the first L-shaped plate body (2-1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910888848.5A CN110594331B (en) | 2019-09-19 | 2019-09-19 | Hierarchical periodic structure metamaterial beam suitable for multi-frequency-band vibration reduction |
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| CN201910888848.5A CN110594331B (en) | 2019-09-19 | 2019-09-19 | Hierarchical periodic structure metamaterial beam suitable for multi-frequency-band vibration reduction |
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| CN110594331B CN110594331B (en) | 2021-02-05 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111645846A (en) * | 2020-06-15 | 2020-09-11 | 哈尔滨工程大学 | Novel periodic pyramid lattice metamaterial beam structure with multi-frequency-band vibration reduction |
| CN113361012A (en) * | 2021-06-21 | 2021-09-07 | 西北工业大学 | Metamaterial vibration-damping noise-reducing reinforced wall plate and method |
| CN116145847A (en) * | 2023-04-18 | 2023-05-23 | 北京建筑大学 | Phonon crystal sandwich beam structure based on energy band folding |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111645846A (en) * | 2020-06-15 | 2020-09-11 | 哈尔滨工程大学 | Novel periodic pyramid lattice metamaterial beam structure with multi-frequency-band vibration reduction |
| CN113361012A (en) * | 2021-06-21 | 2021-09-07 | 西北工业大学 | Metamaterial vibration-damping noise-reducing reinforced wall plate and method |
| CN113361012B (en) * | 2021-06-21 | 2024-01-09 | 西北工业大学 | Metamaterial vibration-damping noise-reducing reinforced wallboard and method |
| CN116145847A (en) * | 2023-04-18 | 2023-05-23 | 北京建筑大学 | Phonon crystal sandwich beam structure based on energy band folding |
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