CN114165550A - Transverse low-frequency micro-oscillation vibration isolator adopting magnetic negative stiffness spring - Google Patents
Transverse low-frequency micro-oscillation vibration isolator adopting magnetic negative stiffness spring Download PDFInfo
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- CN114165550A CN114165550A CN202111559104.2A CN202111559104A CN114165550A CN 114165550 A CN114165550 A CN 114165550A CN 202111559104 A CN202111559104 A CN 202111559104A CN 114165550 A CN114165550 A CN 114165550A
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- rotor
- vibration isolator
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- negative stiffness
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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
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/1005—Vibration-dampers; Shock-absorbers using inertia effect characterised by active control of the mass
- F16F7/1011—Vibration-dampers; Shock-absorbers using inertia effect characterised by active control of the mass by electromagnetic means
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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
- F16F6/00—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid
- F16F6/005—Magnetic springs; Fluid magnetic springs, i.e. magnetic spring combined with a fluid using permanent magnets only
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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
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/06—Magnetic or electromagnetic
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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
- F16F2222/00—Special physical effects, e.g. nature of damping effects
- F16F2222/08—Inertia
Abstract
A transverse low-frequency micro-oscillation vibration isolator adopting a magnetic negative stiffness spring comprises the magnetic spring capable of realizing transverse oscillation negative stiffness, a top hoisting piece, a shell, a rigid connecting rod and a suspension rope; the transverse swinging negative-stiffness magnetic spring consists of a permanent magnet, a stator and a rotor; the rigid connecting rod is fixedly connected with the lower end of the top hoisting piece through threads; the rotor is arranged on the rigid connecting rod through threads, and the rigid connecting rod is fixedly connected with the suspension rope; the lower end of the suspension rope is provided with the mass of the suspension object; the negative stiffness generated by the lateral oscillation negative stiffness magnetic spring can offset the restoring positive stiffness generated by the gravity action of the load mass, so that the lateral oscillation frequency of the vibration isolator is reduced. The vibration isolator has the characteristics of small size, compact structure and the like. The device is suitable for ground environment tests of large space structure equipment in the fields of aerospace, precision instruments and the like.
Description
Technical Field
The invention relates to the technical field of passive vibration isolation of environmental micro-vibration, in particular to a transverse low-frequency micro-swing vibration isolator adopting a magnetic negative stiffness spring.
Background
In order to ensure the reliability of the on-orbit operation of the spacecraft, the microgravity ground simulation test is an indispensable work. Among various developed microgravity simulation technologies, the suspension method has the advantages of simple principle, flexible and reliable use, low cost and wide application. In order to reduce the influence on the load, the free state of the load in the weightlessness state is simulated as much as possible, and the suspension device needs to meet the requirements of small mass and low rigidity. Common low-stiffness flexible elements are springs, rubber ropes and the like, but suspension devices designed by using the flexible elements have low bearing capacity and generate large deformation when suspending loads. In order to overcome the defects, the natural frequency of the suspension system is reduced by connecting the positive stiffness mechanism and the negative stiffness mechanism in parallel, so that the suspension frequency of the system is reduced. Therefore, the suspension system with the transverse low-frequency characteristic based on the positive and negative stiffness parallel principle is designed, and the suspension system has important application value.
Disclosure of Invention
The vibration isolator has the characteristics of high static stiffness-low dynamic stiffness near the working balance position, can be used for low-frequency and ultralow-frequency vibration isolation in load suspension tests, has the characteristics of simple structure, convenience in installation, large bearing capacity and low cost, can effectively reduce the suspension frequency of a system, and provides a reliable test method for low-frequency and ultralow-frequency environment test verification of large-scale space structures.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a transverse low-frequency micro-oscillation vibration isolator adopting a magnetic negative stiffness spring comprises a top hoisting piece 1, a top cover 2, a shell 3, a bottom plate 4, a rigid connecting rod 10, a suspension rope 5 and a transverse oscillation negative stiffness magnetic spring consisting of a permanent magnet 8, a stator 7 and a rotor 9; a sleeve 6 is arranged at the center of the transverse swinging negative stiffness magnetic spring, a rigid connecting rod 10 penetrates through the sleeve 6, the top end of the rigid connecting rod is fixedly connected with a top hoisting piece 1 positioned in a top cover 2 through threads, and the bottom end of the rigid connecting rod 10 is fixedly connected with a suspension rope 5; the bottom plate 4 is fixedly arranged with the shell 3 through a fixing bolt and a nut, and a stator 7 is fixed at the same time; the mover 9 is fixedly mounted on the rigid connecting rod 10 through threads, the mover 9 is positioned in the stator 7, and an air gap 11 is formed between the mover 9 and the stator 7, so that the mover 9 can transversely move in the air gap 11; the permanent magnet 8 of the transverse swing negative stiffness magnetic spring is positioned in the stator 7 and on the upper part of the rotor 9, the magnetization direction of the permanent magnet 8 is from top to bottom, the magnetic flux of the permanent magnet 8 flows into the rotor 9 from the N pole, is diffused to the periphery along the side surface of the rotor 9, passes through an air gap 11 between the rotor 9 and the stator 7, and finally returns to the S pole of the permanent magnet 8 through the stator 7.
The top cover 2, the shell 3 and the bottom plate 4 are made of hard aluminum alloy materials.
The stator 7 and the rotor 9 are made of soft magnetic materials with high magnetic permeability.
The permanent magnet 8 is made of neodymium iron boron materials and is magnetized in the axial direction, the bottom of the permanent magnet is an N pole, and the top of the permanent magnet is an S pole.
The top hoisting member 1 is a smooth spherical hinge and is not limited to a spherical hinge, and can be applied to any hoisting structure (such as a flexible hinge, a lifting hook and the like).
And the fixing bolt and the nut both adopt non-magnetic materials.
When the rotor 9 deviates from a balance position, the transverse low-frequency micro-oscillation vibration isolator adopting the magnetic negative stiffness spring can generate positive recovery stiffness under the action of gravity of the load mass 12 suspended under the suspension rope 5; the transverse swinging negative stiffness magnetic spring of the transverse low-frequency micro-swinging vibration isolator can generate negative stiffness to offset the recovered positive stiffness generated by gravity, so that the suspension frequency of the vibration isolator is reduced; the permanent magnet 8, the stator 7, the rotor 9 and the air gap 11 form a magnetic flux loop, and magnetic flux generated by the permanent magnet 8 passes through the rotor 9 and returns to the S pole of the permanent magnet 8 along the stator 7; the magnetic force generated by the magnetic flux of the permanent magnet 8 at the air gap 11 causes the rotor 9 to be subjected to an outward thrust, the rotor 9 shows a destabilization state in the air gap 11 along the circumferential direction, the farther the rotor 9 deviates from a balance position, the closer the rotor 9 is to the stator 7, the larger the magnetic force in the air gap 11 is, the larger the negative stiffness is, and the positive recovery stiffness generated by the action of gravity can be offset, so that the total recovery stiffness is reduced, and the resonance frequency of the vibration isolator is further reduced to an ultralow frequency state.
Compared with the prior art, the invention has the following advantages: the transverse low-frequency micro-oscillation vibration isolator adopting the magnetic negative stiffness spring has a suspension vibration isolation object with enough large static stiffness, large bearing capacity and good stability, and meanwhile, the vibration isolator has very low dynamic stiffness when oscillating near a static balance position, so that the transverse low-frequency micro-oscillation vibration isolator is suitable for low-frequency and ultralow-frequency test application of a suspension system. The transverse low-frequency micro-oscillation vibration isolator adopting the magnetic negative stiffness spring has the advantages of compact structure, convenience in processing and manufacturing, easiness in maintenance and convenience in installation.
Drawings
Fig. 1 is a general schematic diagram of the transverse low-frequency micro-oscillation vibration isolator.
Fig. 2 is a structural sectional view of the transverse low-frequency micro-oscillation vibration isolator.
FIG. 3 is a schematic structural view of a lateral swinging negative stiffness magnetic spring according to the present invention.
Fig. 4 is a schematic view of the structure of a permanent magnet according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific embodiments.
As shown in fig. 1 and 2, the transverse low-frequency micro-oscillation vibration isolator adopting the magnetic negative stiffness spring comprises a top hoisting piece 1, a top cover 2, a shell 3, a bottom plate 4, a rigid connecting rod 10, a suspension rope 5 and a transverse oscillation negative stiffness magnetic spring consisting of a permanent magnet 8, a stator 7 and a rotor 9. The sleeve 6 is installed at the center of the transverse swing negative stiffness magnetic spring, the rigid connecting rod 10 penetrates through the sleeve 6, the top end of the rigid connecting rod is fixedly connected with the top hoisting piece 1 positioned in the top cover 2 through threads, and the bottom end of the rigid connecting rod 10 is fixedly installed with the suspension rope 5 through nuts. The base plate 4 is fixedly mounted to the housing 3 by fixing bolts and nuts so that the stator 7 is fixed. The mover 9 is fixedly mounted on the rigid connecting rod 10 through threads, the mover 9 is positioned in the stator 7, and an air gap 11 is formed between the mover 9 and the stator 7, so that the mover 9 can move transversely in the air gap 11; the permanent magnet 8 of the transverse swing negative stiffness magnetic spring is positioned in the stator 7 and on the upper part of the mover 9.
As shown in FIG. 3, the invention relates to a transverse low-frequency micro-oscillation vibration isolator adopting a magnetic force negative stiffness spring, wherein the transverse oscillation negative stiffness magnetic force spring comprises a stator 7, a permanent magnet 8, a rotor 9 and an air gap 11. Wherein the magnetization direction of the permanent magnet 8 is indicated in fig. 4 as the dotted arrow points. The magnetic flux generated by the permanent magnet 8 flows out from the N pole at the lower end of the permanent magnet 8, passes through the upper surface of the mover 9, spreads outward along the side surface of the mover 9, flows into the stator 7 through the air gap 11 between the mover 9 and the stator 7, and finally returns to the S pole at the upper end of the permanent magnet 8. The magnetic force generated by the magnetic flux of the permanent magnet 8 at the air gap 11 makes the mover 9 subject to an outward thrust, and the mover 9 exhibits a destabilized state in the air gap 11 along the circumferential direction thereof, which may be equivalent to a magnetic spring having a negative stiffness effect. The magnetic spring provides negative stiffness in parallel with restoring positive stiffness due to the gravity action of the load mass 12, reducing the equivalent stiffness of the isolator structure, thereby reducing the suspension frequency of the isolator.
In a preferred embodiment of the present invention, the top cover 2, the outer case 3 and the bottom plate 4 are made of a hard aluminum alloy material.
As a preferred embodiment of the present invention, a soft magnetic material with high magnetic permeability is used for both the stator 7 and the mover 9.
In the preferred embodiment of the present invention, the permanent magnet 8 is made of neodymium iron boron material and is magnetized along the axial direction, and the bottom is an N pole and the top is an S pole.
As a preferred embodiment of the invention, the top sling 1 is a smooth ball hinge and is not limited to a ball hinge, and can be applied to any lifting structure (such as flexible hinges, hooks, etc.).
As a preferred embodiment of the invention, the fixing bolt and the nut both adopt non-magnetic-conductive materials.
The working principle of the invention is as follows: when the load mass 12 suspended under the suspension rope 5 is disturbed when being suspended, the load mass 12 drives the suspension rope 5 and the rigid connecting rod 10 to deviate from the central position, the mover 9 fixedly installed with the rigid connecting rod 10 also deviates from the central position, and the air gap 11 between the mover 9 and the stator 7 is reduced and the magnetic force received by the mover 9 is increased along with the reduction of the air gap 11 as the mover 9 is deviated from the central position and is closer to the stator 7 due to the magnetic force generated by the magnetic flux of the permanent magnet 8 at the air gap 11, which is represented as a magnetic spring with negative stiffness effect. The magnetic spring provides negative stiffness, and is connected in parallel with recovered positive stiffness generated under the action of gravity of the load mass 12, so that the equivalent stiffness of the vibration isolator is reduced, the suspension frequency of the vibration isolator is effectively reduced, and the whole vibration isolator meets the requirements of low-frequency and ultralow-frequency environmental tests.
Claims (7)
1. The utility model provides an adopt little swing isolator of horizontal low frequency of magnetic force burden rigidity spring which characterized in that: the device comprises a top hoisting piece (1), a top cover (2), a shell (3), a bottom plate (4), a rigid connecting rod (10), a suspension rope (5) and a transverse swinging negative stiffness magnetic spring consisting of a permanent magnet (8), a stator (7) and a rotor (9); a sleeve (6) is installed in the center of the transverse swinging negative-stiffness magnetic spring, a rigid connecting rod (10) penetrates through the sleeve (6), the top end of the rigid connecting rod is fixedly connected with a top hoisting piece (1) positioned in a top cover (2) through threads, and the bottom end of the rigid connecting rod (10) is fixedly connected with a suspension rope (5); the bottom plate (4) is fixedly arranged with the shell (3) through a fixing bolt and a nut, and a stator (7) is fixed at the same time; the rotor (9) is fixedly installed on the rigid connecting rod (10) through threads, the rotor (9) is located in the stator (7), and an air gap (11) is formed between the rotor (9) and the stator (7) so that the rotor (9) can transversely move in the air gap (11); the permanent magnet (8) of the transverse swing negative stiffness magnetic spring is positioned in the stator (7) and on the upper portion of the rotor (9), the magnetization direction of the permanent magnet (8) is from top to bottom, magnetic flux of the permanent magnet (8) flows into the rotor (9) from the N pole, diffuses towards the periphery along the side face of the rotor (9), passes through an air gap (11) between the rotor (9) and the stator (7), and finally returns to the S pole of the permanent magnet (8) through the stator (7).
2. The transverse low-frequency micro-oscillation vibration isolator adopting the magnetic force negative stiffness spring as claimed in claim 1, is characterized in that: when the load mass (12) suspended under the suspension rope (5) is disturbed when being suspended, the load mass (12) drives the suspension rope (5) and the rigid connecting rod (10) to deviate from the central position, the rotor (9) fixedly installed with the rigid connecting rod (10) also deviates from the central position, and as the rotor (9) is subjected to the magnetic force generated by the magnetic flux of the permanent magnet (8) at the air gap (11), the rotor deviates from the central position and approaches the stator (7), the air gap (11) between the rotor (9) and the stator (7) is reduced, the magnetic force applied to the rotor (9) is increased along with the reduction of the air gap (11), and the rotor is represented as a magnetic spring with a negative stiffness effect; the magnetic spring provides negative stiffness, and is connected in parallel with recovered positive stiffness generated under the action of gravity of the load mass (12), so that the equivalent stiffness of the vibration isolator is reduced, the suspension frequency of the vibration isolator is effectively reduced, and the whole vibration isolator meets the requirements of low-frequency and ultralow-frequency environmental tests.
3. The transverse low-frequency micro-oscillation vibration isolator adopting the magnetic force negative stiffness spring as claimed in claim 1, is characterized in that: the top cover (2), the shell (3) and the bottom plate (4) are made of hard aluminum alloy materials.
4. The transverse low-frequency micro-oscillation vibration isolator adopting the magnetic force negative stiffness spring as claimed in claim 1, is characterized in that: the stator (7) and the rotor (9) are made of soft magnetic materials with high magnetic permeability.
5. The transverse low-frequency micro-oscillation vibration isolator adopting the magnetic force negative stiffness spring as claimed in claim 1, is characterized in that: the permanent magnet (8) is made of neodymium iron boron materials, is magnetized along the axial direction, and is provided with an N pole at the bottom and an S pole at the top.
6. The transverse low-frequency micro-oscillation vibration isolator adopting the magnetic force negative stiffness spring as claimed in claim 1, is characterized in that: the top hoisting piece (1) adopts a smooth spherical hinge, a flexible hinge or a lifting hook.
7. The transverse low-frequency micro-oscillation vibration isolator adopting the magnetic force negative stiffness spring as claimed in claim 1, is characterized in that: and the fixing bolt and the nut both adopt non-magnetic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111559104.2A CN114165550B (en) | 2021-12-20 | 2021-12-20 | Transverse low-frequency micro-oscillation vibration isolator adopting magnetic negative stiffness spring |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111559104.2A CN114165550B (en) | 2021-12-20 | 2021-12-20 | Transverse low-frequency micro-oscillation vibration isolator adopting magnetic negative stiffness spring |
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| CN114165550A true CN114165550A (en) | 2022-03-11 |
| CN114165550B CN114165550B (en) | 2022-10-28 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106321719A (en) * | 2016-10-20 | 2017-01-11 | 华中科技大学 | Active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection |
| CN107228147A (en) * | 2017-06-09 | 2017-10-03 | 浙江大学 | A kind of vertical tuned mass damper of magneto ultralow frequency |
| CN108167362A (en) * | 2018-01-03 | 2018-06-15 | 上海大学 | It is a kind of using multi-electrode Squeeze Mode magnetic spring and the quasi-zero stiffness vibration isolators of swing rod |
| CN109139760A (en) * | 2018-09-12 | 2019-01-04 | 西安交通大学 | A kind of quasi-zero stiffness vibration isolators of positive and negative Stiffness |
| US10236109B1 (en) * | 2017-10-17 | 2019-03-19 | Glen A Robertson | Magnetic spring assembly for mass dampers |
-
2021
- 2021-12-20 CN CN202111559104.2A patent/CN114165550B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106321719A (en) * | 2016-10-20 | 2017-01-11 | 华中科技大学 | Active-passive combined vibration isolator based on positive-stiffness and negative-stiffness parallel connection |
| CN107228147A (en) * | 2017-06-09 | 2017-10-03 | 浙江大学 | A kind of vertical tuned mass damper of magneto ultralow frequency |
| US10236109B1 (en) * | 2017-10-17 | 2019-03-19 | Glen A Robertson | Magnetic spring assembly for mass dampers |
| CN108167362A (en) * | 2018-01-03 | 2018-06-15 | 上海大学 | It is a kind of using multi-electrode Squeeze Mode magnetic spring and the quasi-zero stiffness vibration isolators of swing rod |
| CN109139760A (en) * | 2018-09-12 | 2019-01-04 | 西安交通大学 | A kind of quasi-zero stiffness vibration isolators of positive and negative Stiffness |
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| Publication number | Publication date |
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| CN114165550B (en) | 2022-10-28 |
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