CN104373493B - The low rigidity vibration isolator of a kind of magnetic in parallel - Google Patents
The low rigidity vibration isolator of a kind of magnetic in parallel Download PDFInfo
- Publication number
- CN104373493B CN104373493B CN201410649449.0A CN201410649449A CN104373493B CN 104373493 B CN104373493 B CN 104373493B CN 201410649449 A CN201410649449 A CN 201410649449A CN 104373493 B CN104373493 B CN 104373493B
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- Prior art keywords
- rigidity
- permanent magnet
- vibration isolator
- magnetic
- clamping device
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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
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
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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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The low rigidity vibration isolator of a kind of magnetic in parallel, comprise the arc clamping device of rigidity and rigidly fix arc clamp structure, two ends accommodate the spring beam being fixed on therebetween, spring beam is as the positive rigidity flexible support members of vibration isolator, support bar one end is fixed on the mid point of spring beam by nut check, the free end of support bar is connected with controlled object through the circular hole in the middle of the arc clamping device of rigidity, between the two ends that are fixed at spring beam and mid point, symmetric position is respectively arranged with two pairs of relative permanent magnets of the opposite sex up and down, wherein a permanent magnet in every pair of permanent magnet sticks on spring beam, another permanent magnet is accommodated mechanisms grip fixing by permanent magnet, permanent magnet accommodates mechanism and is fixed on the arc clamping device of rigidity or is rigidly fixed on arc clamp structure by bolts and nuts, make the distance between every pair of permanent magnet adjustable, structure of the present invention can reduce the intrinsic frequency of vibrating isolation system effectively, thereby widens vibration isolation frequency band, for vibration control provides a kind of method reliably.
Description
Technical field
The present invention relates to vibration isolator technical field, be specifically related to the low rigidity vibration isolation of a kind of magnetic in parallelDevice.
Background technology
Vibration problem is extensively present in the middle of actual life and production. When mechanical system is in outsideUnder the effect of excitation, will produce vibration. People utilize that vibration is screened, pile sinking, coagulationSoil perfusion waits actual production, and this just makes Vibration Using Engineering obtain development rapidly. But,In the science and techniques of defence such as precision instrument, Aero-Space leading-edge field, vibration tends to cause machinery knotThe destruction of structure, precision and the service life of reducing system. Therefore, effectively reducing vibration bringsHarm obtained widely research. Wherein, vibration isolation as a kind of vibration control means in realityIn engineering application, play more and more important effect, for medium-high frequency common in production realityVibration, can adopt existing corresponding linear theory of vibration isolation and method to realize effective control,But the vibration for low frequency region is often difficult to effective vibration isolation. For example, spacecraft in orbitDuring this time, sweep mechanism rotation, large-scale controlled in rotatable parts high speed rotating, payload on starThruster ignition operation, cryogenic refrigerator during member drives mechanism step motion, the posture adjustment of change railThe mechanical oscillation of the thermal control such as compressor and shutter parts, large-scale flexible structure excited vibration and turnoverWhen shade alternating hot and cold bring out thermal deformation disturbance etc. bring out a kind of amplitude that spacecraft produces lower,The flutter response that frequency is higher.
Vibration isolation is asked in mechanical vibration control as a kind of general passive type vibration control modeIt in topic, is frequent top-priority method. Based on linear theory of vibration isolation, general linear vibration isolatorCentering HFS has vibration isolating effect, to being greater than vibrating isolation system undamped natural frequency of a mechanical systemFrequency band doubly has vibration isolating effect, is difficult to effective isolation for low frequency region. For canVibration to low frequency region is effectively controlled, and commonly uses and has two kinds of methods: the one, reduce vibration isolationThe rigidity of system; The 2nd, the carrying quality of increase vibrating isolation system. Owing to increasing carrying quality in realityLimited in one's ability in the problem of border; The rigidity that reduces vibrating isolation system will cause quiet distortion to increase, and fallsThe stability of low system. Therefore, Nonlinear Vibration Isolation System has obtained discussing widely. For example,Rubber shock absorber, steel-wire isolator, accurate zero stiffness vibration isolator etc. Manage for nonlinear isolationOpinion and method have had some relevant researchs. In recent years, accurate zero stiffness vibration isolator and Gao JingState-low dynamic rate Nonlinear Vibration Isolation System becomes domestic and international many scholars' study hotspot.Such vibrating isolation system, by near the intrinsic frequency of reduction vibrating isolation system equalization point, improvesThe low frequency vibration isolation performance of system. Because the interactional research between magnet structure obtainsCertain progress, it is simple in structure, and the features such as convenient are installed, and magnet structure is applied toThe nonlinear isolation mechanism with high static state-low dynamic rate gives to pay close attention to widely; But,Under certain design objective, design intrinsic frequency low, simple in structure and that size is little is non-Linear vibrating isolation system, comparatively difficulty just seems.
Summary of the invention
The problem existing in order to overcome prior art, the object of the invention is to propose a kind of magnetic in parallelThe low rigidity vibration isolator of property, structure of the present invention has lower intrinsic frequency near equalization point, canFor the operating mode such as micro breadth oscillation vibration isolation, and have simple in structurely, it is convenient to install, the spy that cost is lowPoint.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is as follows:
The low rigidity vibration isolator of a kind of magnetic in parallel, comprises that the arc clamping device 5 of rigidity and rigidity are solidFixed arc clamp structure 6, two ends accommodate and are fixed on the arc clamping device 5 of rigidity and rigidly fixThe spring beam 2 that arc clamp structure is 6, described spring beam 2 is as the positive rigidity bullet of vibration isolatorProperty support component, one end of support bar 1 is fixed on the mid point of spring beam 2 by nut check,The free end of support bar 1 comes and controlled object through the circular hole in the middle of the arc clamping device 5 of rigidityBe connected, between the two ends that are fixed at spring beam 2 and mid point, symmetric position is respectively arranged with up and downTwo pairs of permanent magnets that the opposite sex is relative, size and the physics of eight permanent magnets in totally four pairs of permanent magnetsParameter is all identical, and four pairs of permanent magnets form the magnet spring of described vibration isolator, and is vibration isolatorNon-linear magnetic force and non-linear negative stiffness are provided; A wherein permanent magnet in every pair of permanent magnetStick on spring beam 2, another permanent magnet is accommodated mechanism 15 by permanent magnet to be clamped and fixes,Described permanent magnet accommodates mechanism 15 and is fixed on the arc clamping of rigidity by the first bolt 16 with nutMechanism 5 or rigidly fix on arc clamp structure 6, makes the distance between every pair of permanent magnet adjustable.
All parts of described vibration isolator all adopt non-magnet material.
Between the circular hole in the middle of described support bar 1 and the arc clamping device 5 of rigidity, linear axis is setHold 7.
In described every pair of permanent magnet, the distance of two permanent magnets is 5mm～6.5mm.
The arc clamping device 5 of described rigidity and rigidly fixing between arc clamp structure 6 by four pairsThe second bolt 8 is fixing, the arc clamping device 5 of each the second bolt and rigidity with rigidly fix bow6 of shape clamp structures arrange respectively the first pad 9 and the second pad 10.
Described permanent magnet is fixed on the side of permanent magnet blessing mechanism 15 by bolt 20.
By nut 17, the first bolt 16 and permanent magnet being accommodated to mechanism 15 locks.
Compared to the prior art, tool has the following advantages in the present invention:
1,, due to the introducing of permanent magnet, make vibration isolator response, noncontact fast, account forLittle with space, can come to improve in the direction of motion for vibration isolator by the position that regulates permanent magnetLarge non-linear magnetic force, simultaneously near the place of equilbrium position for system provides negative stiffness.
2, the low rigidity vibration isolator of the present invention's magnetic in parallel, according to the characteristic of flexible member, adopts twoHold the positive rigidity flexible support members of fixing spring beam 2 as vibrating isolation system.
3, permanent magnet clamping device 16 of the present invention is solid with the arc blessing of rigidity mechanism 5 and rigidityBetween fixed arc clamp structure 6, be connected by bolt 17, the position of adjusting bolt 17 and lengthDegree is the distance between distributing position and every two permanent magnets of adjustable permanent magnet.
4, all parts of the present invention all adopt non-magnet_conductible material, avoid to permanent magnet produceMagnetic induction intensity cause interference.
5, the present invention is simple in structure, easy to use, with low cost, has for micro breadth oscillationWell anti-vibration performance.
Brief description of the drawings
Fig. 1 is front view of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, structural principle of the present invention and operation principle are further done to detailed theoryBright.
As shown in Figure 1, the low rigidity vibration isolator of a kind of magnetic in parallel of the present invention, comprises that rigidity is arcClamping device 5 and rigidly fix arc clamp structure 6, two ends accommodate and are fixed on rigidity cramp frameHold mechanism 5 and rigidly fix the spring beam 2 between arc clamp structure 6, described spring beam 2 is doneFor the positive rigidity flexible support members of vibration isolator, one end of support bar 1 is by the first top nut 3Be locked at the mid point of spring beam 2 with the first lower nut 4, the free end of support bar 1 passesCircular hole in the middle of the arc clamping device 5 of rigidity is connected with controlled object, solid at spring beam 2 quiltsBetween fixed two ends and mid point, symmetric position is respectively arranged with two pairs of relative permanent magnetism of the opposite sex up and downBody, as second pair of permanent magnet 12 on first of bottom, the left side pair of permanent magnet 11, top, the left side,The 3rd pair of permanent magnet 13 of bottom, the right and the 4th pair of permanent magnet 14 on top, the right, totally four pairsSize and the physical parameter of eight permanent magnets in permanent magnet are all identical, and four pairs of permanent magnets form instituteState the magnet spring of vibration isolator, and for vibration isolator provide non-linear magnetic force and non-linear negative justDegree; Wherein a permanent magnet in every pair of permanent magnet sticks on spring beam 2, another permanent magnetismBody is accommodated mechanism 15 by permanent magnet to be clamped and fix, and described permanent magnet accommodates mechanism 15 and passes through theOne bolt 16 and the second top nut 18 and the second lower nut 19 are fixed on the arc clamping machine of rigidityStructure 5 or rigidly fix on arc clamp structure 6, makes the distance between every pair of permanent magnet adjustable.
As the preferred embodiment of the present invention, all parts of described vibration isolator all adopt non-leadingMagnetic material.
As the preferred embodiment of the present invention, at described support bar 1 and the arc clamping machine of rigidityBetween the circular hole in the middle of structure 5, linear bearing 7 is set.
As the preferred embodiment of the present invention, the distance of two permanent magnets in described every pair of permanent magnetFrom being 5mm～6.5mm.
As the preferred embodiment of the present invention, the arc clamping device 5 of described rigidity and rigidity are solid6 of fixed arc clamp structures are fixing by four pairs of the second bolts 8, each the second bolt and rigidityArc clamping device 5 and rigidly fix the first pad 9 Hes are set respectively between arc clamp structure 6The second pad 10.
As the preferred embodiment of the present invention, described permanent magnet is fixed on forever by bolt 20Magnet accommodates the side of mechanism 15.
As the preferred embodiment of the present invention, by nut 17 by the first bolt 16 and permanent magnetismBody accommodates mechanism 15 and locks.
Operation principle of the present invention is: in the time that structure need to be born elastic anchorage force, bend in rigidityShape clamping device 5 and the spring beam 2 that rigidly fixes between arc clamp structure 6 clamping are at centerPlace is connected and locks with support bar 1, for controlled device provides elastic anchorage force. When work, willControlled device is connected with support bar 1 free end, rigidly fixes arc clamp structure 6 solid with vibration sourceCompany, when the controlled device that support bar 1 supports is consolidated with respect to the arc blessing of rigidity mechanism 5 and rigidityWhen fixed arc clamp structure 6 is done relative motion, spring beam 2 will make to have single order Mode ShapeVibration, permanent magnet between the changing of distance, and be the axle of controlled device along support bar 1To non-linear magnetic force is provided, the elastic anchorage force opposite direction that its direction and spring beam 2 provide,For system axially provides non-linear negative stiffness along support bar. By the magnetic to formation by permanent magnetThe spring global stiffness that reduce system in parallel with the spring beam 2 that positive rigidity is provided, thus system reducedThe intrinsic frequency of system, and then improve the anti-vibration performance to low frequency region, widen the vibration isolation of system frequentlyBring and realize vibration control.
Claims (7)
1. the low rigidity vibration isolator of magnetic in parallel, is characterized in that: comprise rigidity cramp frameHold mechanism (5) and rigidly fix arc clamp structure (6), two ends accommodate and are fixed on rigidity bowShape clamping device (5) and rigidly fix the spring beam (2) between arc clamp structure (6), instituteState the positive rigidity flexible support members of spring beam (2) as vibration isolator, one of support bar (1)End is fixed on the mid point of spring beam (2) by nut check, the free end of support bar (1) is wornCross the middle circular hole of the arc clamping device of rigidity (5) and be connected with controlled object, at spring beam(2) between the two ends that are fixed and mid point symmetric position to be respectively arranged with up and down the opposite sex relativeTwo pairs of permanent magnets, the size of eight permanent magnets in totally four pairs of permanent magnets and all phases of physical parameterWith, four pairs of permanent magnets form the magnet spring of described vibration isolator, and provide non-line for vibration isolatorProperty magnetic force and non-linear negative stiffness; Wherein a permanent magnet in every pair of permanent magnet sticks on bulletProperty beam (2) upper, another permanent magnet is accommodated mechanism (15) by permanent magnet to be clamped and fixes,Described permanent magnet accommodates mechanism (15) and is fixed on rigidity bow by the first bolt (16) and nutShape clamping device (5) or to rigidly fix arc clamp structure (6) upper, makes between every pair of permanent magnetDistance adjustable.
2. the low rigidity vibration isolator of one according to claim 1 magnetic in parallel, its featureBe: all parts of described vibration isolator all adopt non-magnet material.
3. the low rigidity vibration isolator of one according to claim 1 magnetic in parallel, its featureBe: between the circular hole in the middle of described support bar (1) and the arc clamping device of rigidity (5), establishPut linear bearing (7).
4. the low rigidity vibration isolator of one according to claim 1 magnetic in parallel, its featureBe: in described every pair of permanent magnet, the distance of two permanent magnets is 5mm～6.5mm.
5. the low rigidity vibration isolator of one according to claim 1 magnetic in parallel, its featureBe: the arc clamping device of described rigidity (5) and rigidly fixing between arc clamp structure (6)Fixing by four pairs of the second bolts (8), each the second bolt and the arc clamping device of rigidity (5)And rigidly fix the first pad (9) and the second pad are set respectively between arc clamp structure (6)(10)。
6. the low rigidity vibration isolator of one according to claim 1 magnetic in parallel, its featureBe: described permanent magnet is fixed on the side of permanent magnet blessing mechanism (15) by bolt (20)Face.
7. the low rigidity vibration isolator of one according to claim 1 magnetic in parallel, its featureBe: by nut (17), the first bolt (16) and permanent magnet are accommodated to mechanism (15) lockTightly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410649449.0A CN104373493B (en) | 2014-11-14 | 2014-11-14 | The low rigidity vibration isolator of a kind of magnetic in parallel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410649449.0A CN104373493B (en) | 2014-11-14 | 2014-11-14 | The low rigidity vibration isolator of a kind of magnetic in parallel |
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| CN104373493A CN104373493A (en) | 2015-02-25 |
| CN104373493B true CN104373493B (en) | 2016-05-04 |
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| CN201410649449.0A Expired - Fee Related CN104373493B (en) | 2014-11-14 | 2014-11-14 | The low rigidity vibration isolator of a kind of magnetic in parallel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20180068773A1 (en) * | 2016-09-07 | 2018-03-08 | The Hong Kong Polytechnic University | Apparatus for Negative Stiffness |
| CN107654551B (en) * | 2017-10-25 | 2019-08-13 | 西安交通大学 | A kind of multiple degrees of freedom low frequency vibration isolation device based on mode of oscillation and pendulum modal coupling |
| CN114215877B (en) * | 2021-12-27 | 2022-12-09 | 西安交通大学 | Hourglass-shaped wide-width broadband quasi-zero stiffness electromagnetic vibration isolator |
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| DE2626369A1 (en) * | 1976-06-11 | 1977-12-22 | Maschf Augsburg Nuernberg Ag | CUSHIONING MOUNTING FOR FAST-RUNNING ROTORS |
| CN202402559U (en) * | 2011-12-28 | 2012-08-29 | 中国科学技术大学 | Passive low frequency vibration isolator |
| CN102808883B (en) * | 2012-08-10 | 2014-06-04 | 华中科技大学 | Magnetic negative stiffness mechanism |
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