CN216519352U - Negative stiffness dynamic vibration absorber based on permanent magnet - Google Patents
Negative stiffness dynamic vibration absorber based on permanent magnet Download PDFInfo
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- CN216519352U CN216519352U CN202123280840.2U CN202123280840U CN216519352U CN 216519352 U CN216519352 U CN 216519352U CN 202123280840 U CN202123280840 U CN 202123280840U CN 216519352 U CN216519352 U CN 216519352U
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 24
- 229910000617 Mangalloy Inorganic materials 0.000 claims description 13
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 abstract description 7
- 238000006073 displacement reaction Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model relates to a negative-stiffness dynamic vibration absorber based on permanent magnets. The utility model can meet various requirements of laboratories on the negative-stiffness vibration absorber, improve the utilization rate, reduce the cost, change the negative stiffness item of the system by changing the relative displacement of the permanent magnet, and can also enable the negative-stiffness dynamic vibration absorber to carry out the vibration reduction experiment of the negative-stiffness dynamic vibration absorber in two working environments of a vibration platform or a vibration exciter by installing and removing the I-shaped groove slide way and the I-shaped groove slide block, thereby meeting the requirements of the precision experiment of vibration and optics.
Description
Technical Field
The utility model relates to the fields of mechanical design, vibration machinery and the like, in particular to a negative-stiffness dynamic vibration absorber experimental device which can be used in two working environments of a vibration platform and a vibration exciter.
Background
The vibration system containing the negative stiffness spring has the advantages of low natural frequency, large bearing capacity, good vibration damping effect and the like, so that in recent years, the negative stiffness element is more and more applied to vibration damping. However, because the negative stiffness spring is difficult to realize, the negative stiffness dynamic vibration absorber model does not have a mature experimental equipment design method at present, and a user needs to perform corresponding tests according to the type of the tests performed by the user. Therefore, it is more and more necessary to design a set of simple experimental equipment capable of performing the vibration reduction experiment of the negative-stiffness dynamic vibration absorber under various working environments.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems in the prior art, provides a negative-stiffness dynamic vibration absorber based on a permanent magnet, can meet various requirements of laboratories on the negative-stiffness vibration absorber, improves the utilization rate, reduces the cost, can control the negative stiffness by changing the relative displacement of the permanent magnet, enables the negative-stiffness dynamic vibration absorber to perform experiments in two working environments of a vibration platform or a vibration exciter by installing and removing a groove slideway and a groove slider, and meets the requirements of precise experiments on vibration and optics.
The utility model is realized by the following technical scheme.
A negative stiffness dynamic vibration absorber based on permanent magnets comprises a base, a dynamic vibration absorbing device, a lifting clamping device and four permanent magnets;
the base is provided with a through hole, the through hole is used for fixing the base on a vibration platform, and the vibration platform excites the base to vibrate;
the dynamic vibration absorbing device comprises a first mass block and a second mass block, wherein the first mass block is connected with the second mass block through a first manganese steel sheet and a screw;
the lifting clamping device comprises a hand-operated single-wire-rail ball screw sliding table, a cylindrical linear guide rail, two first fixed blocks and a second fixed block, the cylindrical linear guide rail is arranged on one side of the hand-operated single-wire-rail ball screw sliding table in parallel, the cylindrical linear guide rail is provided with a sliding block with a lock, the two first fixed blocks are arranged in parallel and connected with the hand-operated single-wire-rail ball screw sliding table, the second fixed blocks are detachably fixed on the first mass blocks, the second fixed blocks are positioned between the two first fixed blocks, the upper surface and the lower surface of the second fixed blocks are respectively provided with one permanent magnet, one permanent magnet is arranged on one side, facing the second fixed blocks, of the two first fixed blocks, and the centers of the four permanent magnets are on a vertical line, so that a negative rigidity item is generated;
the hand-operated single-track ball screw sliding table changes the distance between the four permanent magnets through a hand wheel, a second fixing block with different height and a first fixing block with different relative distances, so that the negative stiffness item is changed.
Preferably, still include worker's type groove slide, worker's type groove slider, fixed block three, worker's type groove slider passes through-hole on the base is fixed in the bottom of base, worker's type groove slider and worker's type groove slide cooperation are in slide on the worker's type groove slide, fixed block three is fixed on the base, vibration platform is replaced by the vibration exciter, the ejector pin and the fixed block three of vibration exciter are connected, the vibration exciter passes through three excitations of fixed block the base vibration.
Preferably, two fixed block one is "F" type setting through the montant, and the montant lower extreme is connected with hand formula single line rail ball screw slip table, two distance between the fixed block one is L, and different L's fixed block one combines the fixed block two of co-altitude not, changes the distance between four permanent magnets to change the negative stiffness item.
Preferably, the base, the first mass block, the second mass block, the first fixing block and the second fixing block are all acrylic plates.
Preferably, the fixing block III is an acrylic plate.
Preferably, the length of the manganese steel sheet I is 0.15m, the length of the manganese steel sheet II is 0.3m, and the length of the I-shaped groove slideway is 0.3 m.
Preferably, the tool-shaped groove slide way and the tool-shaped groove slide block are made of aluminum alloy materials.
The acrylic plate member can eliminate the influence of the permanent magnet on the rigid member. First, the smaller the vertical distance between the outer two magnets and the middle magnet, the greater the attraction force. Secondly, when the centers of the two outer permanent magnets and the two middle permanent magnets are on the same vertical line, the minimum rigidity occurs, and at the position, the mass is in a balanced state due to the symmetry of repulsive force between the magnets. When the relative displacement of the central points of the upper two permanent magnets and the middle two permanent magnets on the horizontal line reaches a certain value, the rigidity is positive. When the vertical distance between the two outer magnets and the middle magnet is wide, the force acting on the sliding blocks for fixing the two outer permanent magnets is small, so that small resistance is generated on the sliding blocks for fixing the two middle permanent magnets, and negative stiffness of a small area is generated.
Compared with the prior art, the utility model has the advantages that: the utility model can meet various requirements of laboratories on the negative-stiffness vibration absorber, improve the utilization rate, reduce the cost, change the negative-stiffness item of the system by changing the relative displacement of the permanent magnet, and can also enable the negative-stiffness dynamic vibration absorber to carry out the vibration attenuation experiment of the negative-stiffness dynamic vibration absorber in two working environments of a vibration platform or a vibration exciter by installing and removing the I-shaped groove slide way and the I-shaped groove slide block, thereby meeting the requirements of the precise experiment of vibration and optics.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
FIG. 1 is a schematic view of the overall structure of the preferred embodiment of the present invention;
FIG. 2 is a side view of the overall structure of the preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of a tool-type groove slide structure according to a preferred embodiment of the utility model;
FIG. 4 is a schematic diagram of a slotted slider configuration in accordance with a preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of an experimental setup of a preferred embodiment of the present invention using a vibration exciter as an excitation source;
FIG. 6 is a schematic diagram of an experimental apparatus using an excitation platform as an excitation source according to a preferred embodiment of the present invention;
the attached drawings are marked as follows:
1. the device comprises a base, 2, a permanent magnet, 3, first mass blocks, 4, second mass blocks, 5, first manganese steel sheets, 6, second manganese steel sheets, 7, a hand-operated single-wire-rail ball screw sliding table, 8, first fixing blocks, 9, second fixing blocks, 10, a cylindrical linear guide rail, 11, an I-shaped groove slide way, 12, an I-shaped groove slide block, 13, third fixing blocks, 14, a vibration exciter, 15 and a vibration platform.
Detailed Description
The utility model is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
As shown in fig. 1 and fig. 2, a negative stiffness dynamic vibration absorber based on permanent magnets comprises a base 1, a dynamic vibration absorbing device, a lifting clamping device and four permanent magnets 2;
a through hole is formed in the base 1 and used for fixing the base 1 on a vibration platform, and the vibration platform excites the base 1 to vibrate;
the dynamic vibration absorption device comprises a first mass block 3 and a second mass block 4, the first mass block 3 is connected with the second mass block 4 through a first manganese steel sheet 5 and a screw, the first mass block 3 is connected with the base 1 through a second manganese steel sheet 6 and a screw, and the second mass block 4 is located between the first mass block 3 and the base 1;
the lifting clamping device comprises a hand-operated single-wire-rail ball screw sliding table 7, a cylindrical linear guide rail 10, two first fixing blocks 8 and a second fixing block 9, the cylindrical linear guide rail 10 is arranged on one side of the hand-operated single-wire-rail ball screw sliding table 7 in parallel, the cylindrical linear guide rail 10 is provided with a sliding block with a lock, the two first fixing blocks 8 are arranged in parallel and connected with the hand-operated single-wire-rail ball screw sliding table 7, the second fixing block 9 is detachably fixed on the first mass block 3, the second fixing block 9 is positioned between the two first fixing blocks 8, the upper surface and the lower surface of the second fixing block 9 are respectively provided with one permanent magnet 2, one permanent magnet 2 is respectively arranged on one side, facing the second fixing block 9, of the two first fixing blocks 8, and the centers of the four permanent magnets 2 are on a vertical line, so that a negative rigidity item is generated;
the hand-operated single-track ball screw sliding table 7 changes the distance between the four permanent magnets through a hand wheel, a second fixing block 9 with different heights and a first fixing block 8 with different relative distances, so that the negative stiffness item is changed.
Preferably, as shown in fig. 3-5, the vibration platform further comprises a tool-shaped groove slide 11, a tool-shaped groove slide block 12 and a third fixing block 13, wherein the tool-shaped groove slide block 12 is fixed at the bottom of the base 1 through a through hole in the base 1, the tool-shaped groove slide block 12 is matched with the tool-shaped groove slide 11 and slides on the tool-shaped groove slide 11, the third fixing block 13 is fixed on the base 1, the vibration platform is replaced by a vibration exciter, a mandril of the vibration exciter is connected with the third fixing block 13, and the vibration exciter excites the base 1 to vibrate through the third fixing block 13. Wherein, the I-shaped groove slideway 11 is fixed on a non-vibrating experimental platform.
Preferably, the two first fixing blocks 8 are arranged in an F shape through vertical rods, the lower ends of the vertical rods are connected with the hand-operated single-track ball screw sliding table 7, the distance between the two first fixing blocks 8 is L1, the first fixing blocks 8 of different L1 are combined with the second fixing blocks 9 of different heights, the distance between the four permanent magnets is changed, and therefore the negative stiffness term is changed.
Preferably, the base 1, the first mass block 3, the second mass block 4, the first fixing block 8 and the second fixing block 9 are all acrylic plates.
Preferably, the third fixed block 13 is an acrylic plate.
Preferably, the length of the first manganese steel sheet 5 is 0.15m, the length of the second manganese steel sheet 6 is 0.3m, and the length of the I-shaped groove slide way 11 is 0.3 m.
Preferably, the tool-shaped groove slide way 11 and the tool-shaped groove slide block 12 are made of aluminum alloy materials. The aluminum alloy material has the advantages of light weight, high strength, high rigidity, firmness and durability. The acrylic plate member can eliminate the influence of the permanent magnet on the rigid member. First, the smaller the vertical distance between the outer two magnets and the middle magnet, the greater the attraction force. Secondly, when the centers of the two outer permanent magnets and the two middle permanent magnets are on the same vertical line, the minimum rigidity occurs, and at the position, the mass is in a balanced state due to the symmetry of repulsive force between the magnets. When the relative displacement of the central points of the upper two permanent magnets and the middle two permanent magnets on the horizontal line reaches a certain value, the rigidity is positive. When the vertical distance between the two outer magnets and the middle magnet is wide, the force acting on the sliding blocks for fixing the two outer permanent magnets is small, so that small resistance is generated on the sliding blocks for fixing the two middle permanent magnets, and negative stiffness of a small area is generated.
While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model.
Claims (7)
1. A negative stiffness dynamic vibration absorber based on permanent magnets is characterized by comprising a base (1), a dynamic vibration absorbing device, a lifting clamping device and four permanent magnets (2);
the base (1) is provided with a through hole, the through hole is used for fixing the base (1) on a vibration platform, and the vibration platform excites the base (1) to vibrate;
the dynamic vibration absorption device comprises a first mass block (3) and a second mass block (4), the first mass block (3) is connected with the second mass block (4) through a first manganese steel sheet (5) and a screw, the first mass block (3) is connected with the base (1) through a second manganese steel sheet (6) and a screw, and the second mass block (4) is located between the first mass block (3) and the base (1);
the lifting clamping device comprises a hand-operated single-linear-rail ball screw sliding table (7), a cylindrical linear guide rail (10), two first fixing blocks (8) and two second fixing blocks (9), wherein the cylindrical linear guide rail (10) is arranged on one side of the hand-operated single-linear-rail ball screw sliding table (7) in parallel, the cylindrical linear guide rail (10) is provided with a sliding block with a lock, the two first fixing blocks (8) are arranged in parallel and connected with the hand-operated single-linear-rail ball screw sliding table (7), the two fixing blocks (9) are detachably fixed on the first mass block (3), the second fixing block (9) is positioned between the two first fixing blocks (8), the upper surface and the lower surface of the second fixing block (9) are respectively provided with one permanent magnet (2), the two first fixing blocks (8) are respectively provided with one permanent magnet (2) towards one side of the two fixing blocks (9), and the centers of the four permanent magnets (2) are positioned on a vertical line, thereby generating a negative stiffness term;
the hand-operated single-linear-rail ball screw sliding table (7) changes the distance between the four permanent magnets through a hand wheel operated manually, a second fixing block (9) with different heights and a first fixing block (8) with different relative distances, so that the negative stiffness item is changed.
2. The negative-stiffness dynamic vibration absorber based on permanent magnets according to claim 1, further comprising a tool-shaped groove slideway (11), a tool-shaped groove sliding block (12) and a fixing block III (13), wherein the tool-shaped groove sliding block (12) is fixed at the bottom of the base (1) through a through hole in the base (1), the tool-shaped groove sliding block (12) is matched with the tool-shaped groove slideway (11) and slides on the tool-shaped groove slideway (11), the fixing block III (13) is fixed on the base (1), the vibration platform is replaced by a vibration exciter, a top rod of the vibration exciter is connected with the fixing block III (13), and the vibration exciter excites the base (1) to vibrate through the fixing block III (13).
3. The negative stiffness dynamic vibration absorber based on permanent magnets according to claim 1, wherein the two first fixing blocks (8) are arranged in an F shape through vertical rods, the lower ends of the vertical rods are connected with a hand-operated single-linear-rail ball screw sliding table (7), the distance between the two first fixing blocks (8) is L1, the first fixing blocks (8) with different L1 are combined with the second fixing blocks (9) with different heights, the distance between the four permanent magnets is changed, and therefore a negative stiffness item is changed.
4. The negative stiffness dynamic vibration absorber based on permanent magnets according to claim 1, wherein the base (1), the first mass block (3), the second mass block (4), the first fixing block (8) and the second fixing block (9) are all acrylic plates.
5. The negative stiffness dynamic vibration absorber based on permanent magnets of claim 2, wherein the fixed block three (13) is an acrylic plate.
6. The permanent magnet-based negative stiffness dynamic vibration absorber according to claim 2, wherein the length of the manganese steel sheet I (5) is 0.15m, the length of the manganese steel sheet II (6) is 0.3m, and the length of the I-shaped groove slideway (11) is 0.3 m.
7. The negative-stiffness dynamic vibration absorber based on permanent magnets according to claim 2, wherein the I-shaped groove slide way (11) and the I-shaped groove slide block (12) are made of aluminum alloy materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123280840.2U CN216519352U (en) | 2021-12-24 | 2021-12-24 | Negative stiffness dynamic vibration absorber based on permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123280840.2U CN216519352U (en) | 2021-12-24 | 2021-12-24 | Negative stiffness dynamic vibration absorber based on permanent magnet |
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| Publication Number | Publication Date |
|---|---|
| CN216519352U true CN216519352U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123280840.2U Expired - Fee Related CN216519352U (en) | 2021-12-24 | 2021-12-24 | Negative stiffness dynamic vibration absorber based on permanent magnet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114198446A (en) * | 2021-12-24 | 2022-03-18 | 南昌航空大学 | Negative stiffness dynamic vibration absorber based on permanent magnet |
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2021
- 2021-12-24 CN CN202123280840.2U patent/CN216519352U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114198446A (en) * | 2021-12-24 | 2022-03-18 | 南昌航空大学 | Negative stiffness dynamic vibration absorber based on permanent magnet |
| CN114198446B (en) * | 2021-12-24 | 2024-11-08 | 南昌航空大学 | Negative-rigidity dynamic vibration absorber based on permanent magnet |
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Granted publication date: 20220513 |