CN105156577A - Overdamped vibration isolator capable of generating negative stiffness through inclined magnets - Google Patents
Overdamped vibration isolator capable of generating negative stiffness through inclined magnets Download PDFInfo
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- CN105156577A CN105156577A CN201510564552.XA CN201510564552A CN105156577A CN 105156577 A CN105156577 A CN 105156577A CN 201510564552 A CN201510564552 A CN 201510564552A CN 105156577 A CN105156577 A CN 105156577A
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- vibration isolator
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Abstract
The invention provides an overdamped vibration isolator capable of generating negative stiffness through inclined magnets. The overdamped vibration isolator comprises a central shaft, wherein three bosses are sequentially arranged in the axial direction of the central shaft; the central shaft is connected with an upper fastened end cover and a lower fastened end cover through a pair of mutually-pressed springs; a pair of mutually-pressed springs is arranged between the two bosses in the middle and at the bottom of the central shaft and used for limiting an intermediate annular permanent magnet and enabling the intermediate annular permanent magnet to axially move; a sliding bearing is mounted on the top part of the upper end cover and used for limiting the central shaft and enabling the central shaft to axially move; inclined annular permanent magnets are fastened onto the upper end cover and the lower end cover; the inclined magnets fixed to the upper end cover and the lower end cover and the annular permanent magnet form magnetic springs for supplying negative stiffness to the vibration isolator. A portion of the vibration energy of an object subjected to vibration isolating is transferred to the annular permanent magnets, so that the vibration can be reduced; meanwhile, phase difference occurs between the elastic recovery forces of positive stiffness and negative stiffness, so that the vibration isolator can inhibit the vibration in a resonance area through the overdamping property. The overdamped vibration isolator has the characteristics of being high in bearing capacity, simple in structure, convenient to use, low in cost, and wide in applicable scope.
Description
Technical field
The present invention relates to a kind of vibration isolator, be specifically related to a kind of overdamp vibration isolator adopting tilting magnet to produce negative stiffness.
Background technique
When mechanical structure is subject to external disturbance effect, system will produce forced vibration.Wherein, for the suppression problem of nuisance vibration in Practical Project, people give large quantity research; In fields such as space flight and aviation engineering, instrument and precision engineerings, mechanical vibration often cause structural damage to lose efficacy, the decline of instrument device measuring accuracy, the rough sledding such as the shortening in structure working life.Such as, during Spacecraft Launch, the reduction of the launch accuracy that foreign impacts load causes; When vehicle travels, the degree of comfort decreased that uneven road surface causes; The reduction etc. of the instrument measuring accuracy that external disturbance causes.
To have structure simple due to it for passive type vibration isolation technique, and low cost, easily realizes, but in the middle of the features such as high stability are widely used in the shaking of structure, vibration damping controls; But the nuisance vibration of a traditional linear vibrating isolation system often centering-high frequency band scope has vibration isolating effect, and the vibration for low-frequency range is often difficult to effective isolation; Therefore, in recent years, design by introducing negative rigidity mechanism on the basis of conventional linear vibration isolator there is high static stiffness-low dynamic rate vibration isolator obtain and study widely, thus vibration isolation frequency band can be widened further on the basis of linear vibrating isolation system, realize the effective suppression to low-frequency vibration; Meanwhile, due to the further raising of permanent magnet performance, such vibration isolator adopting magnetic structure to design content with funtion demand seems relatively easy, but such vibrating isolation system is relatively poor for the vibration suppressioning effect of resonance zone; Under the condition of satisfied actual user demand, design compact structure, realize low frequency vibration isolation, the particularly difficulty and the vibration isolator that resonance zone can be suppressed to vibrate just seems.
Summary of the invention
In order to overcome above-mentioned prior art Problems existing, the object of the present invention is to provide a kind of overdamp vibration isolator adopting tilting magnet to produce negative stiffness, apparatus of the present invention have the strong and overdamp characteristic of bearing capacity near its working position, can superlow frequency vibration isolating be realized and effectively can suppress the vibration of resonance zone, making vibrating isolation system avoid occurring resonance phenomenon; Meanwhile, this vibrating isolation system has features simple structure, easy to use, cost is low, the feature of applied range.
The present invention solves the technological scheme that existing technologies problem adopts:
A kind of overdamp vibration isolator adopting tilting magnet to produce negative stiffness, comprise from top to bottom successively with the central shaft 1 of the first boss 20, second boss 9 and the 3rd boss 13, described central shaft 1 is through by the middle part of the upper end cap 6 of the fastening locking of the 3rd clamping bolt 7 and lower end cap 15, wherein, it is outside that first boss 20 is positioned at upper end cap 6, and the second boss 9 and the 3rd boss 13 are positioned at the cavity of upper end cap 6 and lower end cap 15; Arrange sliding bearing 3 between described central shaft 1 outer wall and upper end cap 6, sliding bearing 3 extends axially through the first clamping bolt 2 and is connected with upper end cap 6 is fastening; Described upper end cap 6 and lower end cap 15 are conical surface, upper end cap 6 conical surface is arranged the cavity of multiple positional symmetry, the first inclination annular permanent magnet 5 is fastenedly connected with by the second clamping bolt 4 in each cavity, lower end cap 15 conical surface is arranged cavity that is multiple and upper end cap 6 conical surface upper cavity positional symmetry, in each cavity, be fastenedly connected with the second inclination annular permanent magnet 17 by the 4th clamping bolt 16; Described lower end cap 15 is connected with base 19 is fastening by the 5th clamping bolt 18; Being provided with between the second boss 9 of described central shaft 1 and the 3rd boss 13 can the 3rd annular permanent magnet 11 of centrally axle 1 axial motion, arranges the 3rd spring 10 and the 4th spring 12 between the second boss 9 of described 3rd annular permanent magnet 11 and central shaft 1 and the 3rd boss 13 respectively; By the 3rd spring 10 and the 4th spring 12 mutual, 3rd annular permanent magnet 11 is retrained to pressure and make its centrally axle 1 axial motion; When structure needs to bear axial elastic anchorage force, between the second boss 9 of central shaft 1 and upper end cap 6, be provided with the first spring 8, between the 3rd boss 13 of central shaft 1 and lower end cap 15, be provided with the second spring 14; By the first spring 8 and the second spring 14 mutual to pressure for overdamp vibration isolator provides certain bearing capacity vertically.
Described first spring 8 is identical with the stiffness coefficient of the second spring 14.
Described 3rd spring 10 is identical with the stiffness coefficient of the 4th spring 12.
Except the first spring 8, second spring 14 the 3rd spring 10 and the 4th spring 12, all the other component of described overdamp vibration isolator all adopt non-magnetic metallic material.
The angle of inclination i.e. angle of inclination in the first inclination annular permanent magnet 5 and the second inclination annular permanent magnet 17 relative level direction in the conical surface relative level direction of described upper end cap 6 and lower end cap 15 is 30
0.
Described central shaft 1 is positioned at the thread section being provided with above the first boss 20 and being convenient to be connected with by control structure, the bottom of described base 19 is provided with the thread section being convenient to be connected with vibration source.
Compared to the prior art, tool has the following advantages in the present invention:
1, when axially loading, the first spring 8 and the second spring 14 is set between upper end cap 6 and the second boss 9 of central shaft 1 and between lower end cap 15 and the 3rd boss 13 of central shaft 1 respectively; Adopt and mutually can improve structure bearing capacity vertically to first spring 8 of pressing and the second spring 14; Meanwhile, its have take up room little, simple and convenient, be convenient to regulate change.
2, the first inclination annular permanent magnet 5, the second inclination annular permanent magnet 17 be fixed on upper end cap 6, lower end cap 15 forms magnet spring with the 3rd annular permanent magnet 11 of relative movement vertically, and magnet spring provides negative stiffness vertically for system, and then realize low frequency vibration isolation, widen vibration isolation frequency band; Phase difference is there is because magnet spring acts between magnetic restoring force on the 3rd annular permanent magnet 11 and the elastic restoring force provided by first, second, third and fourth spring 8,14,10,12, make vibration isolator have overdamp characteristic, thus the vibratory response of resonance zone can be suppressed.
3, because the first inclination annular permanent magnet 5, second inclination annular permanent magnet 17 adopts the mounting type of inclination, it reduces the radial dimension of vibration isolator further, makes vibrating isolation system simple, compact, is convenient to use under multiple occasion.
4, the present invention has overdamp characteristic for making vibrating isolation system, 3rd spring 10 is set respectively between second boss 9 and the 3rd boss 13 of central shaft 1 and the 4th spring 12 retrains the 3rd annular permanent magnet 11, makes the 3rd annular permanent magnet 11 can produce small relative motions vertically by relative centre axle 1.
5, except the first spring 8, second spring 14 the 3rd spring 10 and the 4th spring 12, all the other component of the present invention all adopt non-magnetic metallic material, when the 3rd annular permanent magnet 11 is along when moving, the change of vibration isolator internal magnetic field will be caused, in non-magnetic metallic element, form foucault current, can further improve the damping characteristic of vibration isolator.
6, due to by a part of vibrational energy transfer of vibration isolation object on the annular permanent magnet moved vertically, decayed by the vibration of vibration isolation object.
7, the present invention has structure simply, and easy to use, cost is low, widely used feature.
Accompanying drawing explanation
Fig. 1 is vibration isolator assembly half sectional view of the present invention.
Axle parts drawing centered by Fig. 2.
Fig. 3 a is upper and lower end cap plan view, and Fig. 3 b is upper and lower end cap isometric view.
Fig. 4 a mounting base plan view, Fig. 4 b mounting base isometric view.
Fig. 5 is the transmission ratio-frequency curve of vibrating isolation system.
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present invention and working principle are elaborated further.
As shown in Figure 1, Figure 2, Figure 3 and Figure 4, the present invention is a kind of overdamp vibration isolator adopting tilting magnet to produce negative stiffness, comprise the central shaft 1 with the first boss 20, second boss 9, the 3rd boss 13, thread section is set at the upper shaft part of the first described boss 20; Between the first described boss 20 and the second boss 9, sliding bearing 3 is set vertically; Described sliding bearing 3 is connected with the upper-end surface of upper end cap 6 is fastening by the first clamping bolt 2; The conical surface of described upper end cap 6 arranges four cavitys; First inclination annular permanent magnet 5 is arranged in the cavity on described upper end cap 6 conical surface; Described upper end cap 6 is connected by the second clamping bolt 4 is fastening with the first inclination annular permanent magnet 5; Described upper end cap 6 is connected by the 3rd clamping bolt 7 is fastening with lower end cap 15; The conical surface of described lower end cap 15 arranges four cavitys equally, and the second inclination annular permanent magnet 17 is fixed in the cavity on described lower end cap 15 conical surface; By adopting the 4th clamping bolt 16 second inclination annular permanent magnet 17 locked with lower end cap 15 and be connected; Adopt the 5th clamping bolt 18 mounting base 19 to be connected with lower end cap 15 is fastening in the bottom of described lower end cap 15; The middle axle head of described mounting base 19 arranges the boss 21 that has through hole 22, and shaft part arranges screw thread below described boss 21; 3rd annular permanent magnet 11 that can move vertically is set between second boss 9 and the 3rd boss 13 of described central shaft 1; Between second boss 9, the 3rd boss 13 of the 3rd described annular permanent magnet 11 and central shaft 1, the 3rd spring 10 and the 4th spring 12 are set respectively.When structure needs to bear axial elastic anchorage force, the first spring 8 and the second spring 14 is set between described upper end cap 6 and the second boss 9 of central shaft 1 and between lower end cap 15 and the 3rd boss 13 of central shaft 1 respectively.
Preferably, the first described inclination annular permanent magnet 5 and the second inclination annular permanent magnet 17 all symmetry are arranged in the cavity on upper end cap 6 and lower end cap 15 conical surface, and the angle of inclination in conical surface relative level direction is 30 °.
Preferably, the first described inclination annular permanent magnet 5 and the angle of inclination in the second inclination annular permanent magnet 17 relative level direction are 30 °.
Preferably, the first described spring 8 and the second spring 14 have identical stiffness coefficient.
Preferably, described 3rd spring 10 and the 4th spring 12 have identical stiffness coefficient.
Preferably, except the first spring 8, second spring 14, the 3rd spring 10 and the 4th spring 12, all the other component of vibration isolator all adopt non-magnetic metallic material.
Working principle of the present invention is: during use, and be connected with by control structure by the upper thread section of central shaft 1, base 19 is connected with vibration source; When central shaft 1, the 3rd annular permanent magnet 11 and when there is relative movement between upper end cap 6 and lower end cap 15, be fixed on the first inclination annular permanent magnet 5 on upper end cap 6 and lower end cap 15 and the second inclination annular permanent magnet 17 will attract the 3rd annular permanent magnet 11 respectively, and vertically for system provides negative stiffness; The first fastened inclination annular permanent magnet 5 and the second inclination annular permanent magnet 17 form magnet spring with the 3rd annular permanent magnet 11 moved vertically, be transferred on the 3rd annular permanent magnet 11 by a part of vibrational energy of vibration isolation object, reduce by vibration isolation object with vibrational energy, and then can suppress by the vibration of vibration isolation object; To act on the 3rd annular permanent magnet 11 between magnetic restoring force vertically and the axial elasticity restoring force provided by the first spring 8, second spring 14, the 3rd spring 10 and the 4th spring 12 and there is phase difference, vibration isolator is made to have overdamp characteristic, the vibration of resonance zone can be suppressed, avoid vibration isolator to occur resonance; When the present invention is in work, the changes of magnetic field of device inside will produce foucault current in non-magnetic metallic element, and then produces the damping force contrary with moving direction, further increases the damping characteristic of vibration isolator; The isolation characteristics of overdamp vibration isolator as shown in Figure 5, compared with the linear vibrating isolation system that it is corresponding, widened vibration isolation frequency band and effectively can suppress the vibration of resonance zone, ensure that the decrement of dither simultaneously by overdamp vibration isolator.
Claims (6)
1. the overdamp vibration isolator adopting tilting magnet to produce negative stiffness, it is characterized in that: comprise from top to bottom successively with the first boss (20), the central shaft (1) of the second boss (9) and the 3rd boss (13), described central shaft (1) is through by the middle part of the upper end cap (6) of the 3rd clamping bolt (7) fastening locking and lower end cap (15), wherein, it is outside that first boss (20) is positioned at upper end cap (6), second boss (9) and the 3rd boss (13) are positioned at the cavity of upper end cap (6) and lower end cap (15), arrange sliding bearing (3) between described central shaft (1) outer wall and upper end cap (6), sliding bearing (3) extends axially through the first clamping bolt (2) and is connected with upper end cap (6) is fastening, described upper end cap (6) and lower end cap (15) are conical surface, upper end cap (6) conical surface is arranged the cavity of multiple positional symmetry, the first inclination annular permanent magnet (5) is fastenedly connected with by the second clamping bolt (4) in each cavity, lower end cap (15) conical surface is arranged cavity that is multiple and upper end cap (6) conical surface upper cavity positional symmetry, in each cavity, be fastenedly connected with the second inclination annular permanent magnet (17) by the 4th clamping bolt (16), described lower end cap (15) is connected with base (19) is fastening by the 5th clamping bolt (18), being provided with between second boss (9) of described central shaft (1) and the 3rd boss (13) can the 3rd annular permanent magnet (11) of centrally axle (1) axial motion, arranges the 3rd spring (10) and the 4th spring (12) between second boss (9) of described 3rd annular permanent magnet (11) and central shaft (1) and the 3rd boss (13) respectively, by the 3rd spring (10) and the 4th spring (12) mutual, 3rd annular permanent magnet (11) is retrained to pressure and make its centrally axle (1) axial motion, when structure needs to bear axial elastic anchorage force, be provided with the first spring (8) between second boss (9) of central shaft (1) and upper end cap (6), between the 3rd boss (13) of central shaft (1) and lower end cap (15), be provided with the second spring (14), by the first spring (8) and the second spring (14) mutual to pressure for overdamp vibration isolator provides certain bearing capacity vertically.
2. adopt tilting magnet to produce the overdamp vibration isolator of negative stiffness according to claim 1, it is characterized in that: described first spring (8) is identical with the stiffness coefficient of the second spring (14).
3. according to claim 1 or 4, adopt tilting magnet to produce the overdamp vibration isolator of negative stiffness, it is characterized in that: described 3rd spring (10) is identical with the stiffness coefficient of the 4th spring (12).
4. adopt tilting magnet to produce the overdamp vibration isolator of negative stiffness according to claim 1, it is characterized in that: except the first spring (8), the second spring (14) the 3rd spring (10) and the 4th spring (12), all the other component of described overdamp vibration isolator all adopt non-magnetic metallic material.
5. adopt tilting magnet to produce the overdamp vibration isolator of negative stiffness according to claim 1, it is characterized in that: the angle of inclination i.e. angle of inclination in the first inclination annular permanent magnet (5) and the second inclination annular permanent magnet (17) relative level direction in the conical surface relative level direction of described upper end cap (6) and lower end cap (15) is 30 °.
6. adopt tilting magnet to produce the overdamp vibration isolator of negative stiffness according to claim 1, it is characterized in that: described central shaft (1) is positioned at the first boss (20) top and is provided with the thread section being convenient to be connected with by control structure, the bottom of described base (19) is provided with the thread section being convenient to be connected with vibration source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510564552.XA CN105156577B (en) | 2015-09-07 | 2015-09-07 | A kind of employing tilting magnet produces the super damping isolator of negative stiffness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510564552.XA CN105156577B (en) | 2015-09-07 | 2015-09-07 | A kind of employing tilting magnet produces the super damping isolator of negative stiffness |
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| Publication Number | Publication Date |
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| CN105156577A true CN105156577A (en) | 2015-12-16 |
| CN105156577B CN105156577B (en) | 2017-03-29 |
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| CN201510564552.XA Expired - Fee Related CN105156577B (en) | 2015-09-07 | 2015-09-07 | A kind of employing tilting magnet produces the super damping isolator of negative stiffness |
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| CN (1) | CN105156577B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840727A (en) * | 2016-05-01 | 2016-08-10 | 上海大学 | Stiffness-adjustable mechanism coupled by axial magnetic force |
| CN111457041A (en) * | 2020-06-12 | 2020-07-28 | 重庆理工大学 | Spring torsion bar type negative stiffness vibration damper |
| CN111963602A (en) * | 2020-08-31 | 2020-11-20 | 合肥工业大学 | Bistable nonlinear energy hydrazine based on electromagnetic negative stiffness |
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| US4432441A (en) * | 1981-04-13 | 1984-02-21 | Kokka Kogyo Kabushiki Kaisha | Vibration isolation apparatus |
| SU1618920A1 (en) * | 1989-01-12 | 1991-01-07 | Криворожский горнорудный институт | Vibration insulator |
| JP2002081498A (en) * | 2000-06-30 | 2002-03-22 | Japan Science & Technology Corp | Vibration resisting method and its device |
| CN202091423U (en) * | 2011-05-27 | 2011-12-28 | 山东理工大学 | Electromagnetic damping vibration absorber |
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2015
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Patent Citations (7)
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| US4432441A (en) * | 1981-04-13 | 1984-02-21 | Kokka Kogyo Kabushiki Kaisha | Vibration isolation apparatus |
| SU1618920A1 (en) * | 1989-01-12 | 1991-01-07 | Криворожский горнорудный институт | Vibration insulator |
| JP2002081498A (en) * | 2000-06-30 | 2002-03-22 | Japan Science & Technology Corp | Vibration resisting method and its device |
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| 张辉 等: "基于负刚度原理隔振机构的建模与仿真", 《现代科学仪器》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105840727A (en) * | 2016-05-01 | 2016-08-10 | 上海大学 | Stiffness-adjustable mechanism coupled by axial magnetic force |
| CN111457041A (en) * | 2020-06-12 | 2020-07-28 | 重庆理工大学 | Spring torsion bar type negative stiffness vibration damper |
| CN111963602A (en) * | 2020-08-31 | 2020-11-20 | 合肥工业大学 | Bistable nonlinear energy hydrazine based on electromagnetic negative stiffness |
| CN111963602B (en) * | 2020-08-31 | 2021-09-21 | 合肥工业大学 | Bistable nonlinear energy hydrazine based on electromagnetic negative stiffness |
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