阅读说明：本技术 一种基于磁路设计的可调准零刚度隔振器 (A kind of adjustable quasi-zero stiffness vibration isolators based on magnetic Circuit Design ) 是由 蒲华燕 元书进 罗均 孙翊 王敏 丁基恒 彭艳 谢少荣 于 2019-09-23 设计创作，主要内容包括：本发明公开一种基于磁路设计的可调准零刚度隔振器,涉及振动控制领域,导向轴安装于外部导磁壳的顶端,负载平台、弹性部件和调节螺母由上至下依次套设安装于导向轴上,负载平台通过连接组件与可动轴连接,能够与可动轴一起沿轴向运动,中间导磁环同轴间隙套设于可动轴外部,两个端部导磁轴位于可动轴两端,与可动轴同轴且有轴向间隙,各连接导磁轴的两端分别与中间导磁环和外部导磁壳的内壁连接,各连接导磁轴上分别套设有一个线圈,外部导磁壳上固定有加速度传感器,加速度传感器和线圈均与控制系统连接。该装置将可调磁负刚度机构与正刚度弹性元件并联,在保证大承载能力的情况下实现低固有频率,提升隔振效果,能量利用率高,使用方便。(The present invention discloses a kind of adjustable quasi-zero stiffness vibration isolators based on magnetic Circuit Design, it is related to vibration control field, guiding axis is installed on the top of external magnetic conduction shell, load platform, elastomeric element and adjusting nut, which are from top to bottom successively arranged, to be installed on guiding axis, load platform passes through connection component and movable axis connection, it can be together with movable shaft axially movable, intermediate magnetic guiding loop concentric gap is sheathed on outside movable shaft, two end magnetic conductive axis are located at movable shaft both ends, it is coaxial with movable shaft and have axial gap, the both ends of each connection magnetic conductive axis are connect with the inner wall of intermediate magnetic guiding loop and external magnetic conduction shell respectively, it is arranged with a coil respectively on each connection magnetic conductive axis, acceleration transducer is fixed on external magnetic conduction shell, acceleration transducer and coil are connect with control system.The device can adjustable magnetic negative rigidity mechanism it is in parallel with positive rigidity elastic element, realize low intrinsic frequency in the case where guaranteeing big bearing capacity, promote vibration isolating effect, capacity usage ratio is high, easy to use.)

1. a kind of adjustable quasi-zero stiffness vibration isolators based on magnetic Circuit Design, which is characterized in that including load platform, connection component, Positive rigidity carrier module, negative stiffness magnetic circuit module and control system, the negative stiffness magnetic circuit module includes external magnetic conduction shell, movable Axis, intermediate magnetic guiding loop, two end magnetic conductive axis and multiple connection magnetic conductive axis, the positive rigidity carrier module includes guiding axis, bullet Property component and adjusting nut, the guiding axis is installed on the top of the external magnetic conduction shell, the load platform, the elastic portion Part and the adjusting nut, which are from top to bottom successively arranged, to be installed on the guiding axis, the adjusting nut and the guiding axis spiral shell Line connection, the load platform pass through connection component and the movable axis connection, and can be together with the movable shaft along axial direction Movement；The movable shaft is set in the external magnetic conduction shell among two end magnetic conductive axis, two end magnetic conductions Axis and the movable shaft are coaxially disposed, and there are gap, two end magnetic conductions between the upper and lower end face of the movable shaft Axis is individually fixed in the top and bottom end of the external magnetic conduction shell；The intermediate magnetic guiding loop concentric gap is sheathed on the movable shaft Outside, the adjusting nut is for adjusting the load platform and the coupled movable shaft and the intermediate magnetic guiding loop Initial relative position；The both ends of each connection magnetic conductive axis are respectively and in the intermediate magnetic guiding loop and the external magnetic conduction shell Wall connects, and is arranged with a coil on each connection magnetic conductive axis respectively, is fixed with acceleration sensing on the external magnetic conduction shell Device, the acceleration transducer and the coil are connect with the control system.

2. the adjustable quasi-zero stiffness vibration isolators according to claim 1 based on magnetic Circuit Design, which is characterized in that the connection Component includes fixed ring and multiple connecting rods, and the Fixing shrink ring is set to the upper end of the movable shaft, with clamp screw radially Nail fixed with the movable shaft, the connecting rod is parallel to each other with the guiding axis, the both ends of each connecting rod respectively with institute It states load platform to connect with the fixed ring, each connecting rod runs through the top of the external magnetic conduction shell and can be relative to institute External magnetic conduction shell is stated to move up and down.

3. the adjustable quasi-zero stiffness vibration isolators according to claim 1 based on magnetic Circuit Design, which is characterized in that the control System includes computer, analog output module, power supply and analog input module, the analog input module and the simulation output Module is connect with the computer respectively, and the acceleration transducer is connect with the analog input module, the power supply and institute Analog output module connection is stated, the coil is connect with the power supply.

4. the adjustable quasi-zero stiffness vibration isolators according to claim 1 based on magnetic Circuit Design, which is characterized in that described movable Axis and two end magnetic conduction shaft diameters are equal, and the axial height of the movable shaft is higher than the axial high of the intermediate magnetic guiding loop Degree.

5. the adjustable quasi-zero stiffness vibration isolators according to claim 4 based on magnetic Circuit Design, which is characterized in that the centre Magnetic guiding loop is mutually perpendicular to the connection magnetic conductive axis, and the inner ring of the coil is close to the outer ring of the connection magnetic conductive axis, the line It is passed through direct current when enclosing work, make the magnetic direction of each coil generation while being directed toward or deviating from the intermediate magnetic guiding loop.

6. the adjustable quasi-zero stiffness vibration isolators according to claim 5 based on magnetic Circuit Design, which is characterized in that further include more A shaft stool, each connection magnetic conductive axis can be fixed on the inner wall of the external magnetic conduction shell by a shaft stool.

7. the adjustable quasi-zero stiffness vibration isolators according to claim 1 based on magnetic Circuit Design, which is characterized in that further include straight Spool is held, and the linear bearing is fixed on the center of the load platform, and the guiding axis passes through the linear bearing, and described Linear bearing is sheathed on outside the guiding axis.

8. the adjustable quasi-zero stiffness vibration isolators according to claim 1 based on magnetic Circuit Design, which is characterized in that the guiding The lower thread of axis is connected to the top upper surface of the external magnetic conduction shell.

9. the adjustable quasi-zero stiffness vibration isolators according to claim 1 based on magnetic Circuit Design, which is characterized in that the elasticity Component is helical spring, rubber or flat spring.

Technical field

The present invention relates to vibration control fields, harmonize zero stiffness vibration isolation based on magnetic Circuit Design more particularly to a kind of Device.

Background technique

Traditional linear vibration isolator, using linear rigidity element, such as helical spring, rubber and air spring are only right Frequency is higher than its intrinsic frequencyExternal drive again just has vibration isolating effect, can amplify vibration (resonance) instead in low frequency range. Vibration isolator intrinsic frequency can be reduced by reducing vibration isolator rigidity, to effectively extend vibration isolation frequency band, promote anti-vibration performance.So And vibration isolator bearing capacity can be reduced by the one hand reducing linear rigidity, cause excessive quiet deformation and destabilization problems；On the other hand The stiffness elements of linear vibration isolator are limited by physical condition is also difficult to realize very low rigidity, such as the air spring of Low rigidity Need very big volume.For the intrinsic contradictions for solving high anti-vibration performance and high bearing capacity, many researchers, which propose, to be passed through Positive and negative Stiffness realizes quasi- zero stiffness, that is, high quiet low dynamic stiffness: high static rigidity guarantees small deformation and high bearing capacity, Low dynamic rate guarantees low intrinsic frequency and high anti-vibration performance.Negative stiffness refers to the spy that the slope of load and displacement curve is negative Property, it is opposite with common positive rigidity.Negative stiffness be it is unstable, mechanical negative rigidity mechanism be usually by several elastic elements and company The parts such as bar are composed with special mode.

However, current its rigidity of most negative rigidity mechanisms is determining that after the assembly is completed, it is unable to on-line control, The immutable vibration isolator of rigidity cannot cope with the case where driving frequency variation, it is difficult to realize optimal anti-vibration performance.In recent years, have People adds actuator in mechanical negative rigidity mechanism to adjust rigidity size, but its mechanical structure volume is big, and performance is by material It is influenced with part processing conditions, and there are dead zone, low-responses, it is difficult to practical for engineering.It is proposed that electromagnetism negative stiffness Mechanism, by hot-wire coil and permanent magnet group at rigidity can be adjusted by control electric current, but permanent magnet is under high temperature and impact It can demagnetize, this prevents coil to cause temperature rise from being passed through high current, also limits the application scenarios of vibration isolator；And magnetic field point Cloth is more dispersed, and utilization rate is low, the magnitude very little of negative stiffness, consumes energy very high, it is difficult to the low frequency vibration isolation for heavy load.

For example the Authorization Notice No. that Shanghai University proposes is the electromagnetism Negative stiffness spring of 105927694 B of CN, utilizes direct current Magnetic field force between hot-wire coil and permanent magnet forms negative stiffness, can linearly adjust negative stiffness size by controlling electric current. But Distribution of Magnetic Field is more dispersed, and magnetic field energy utilization rate is low.

The Authorization Notice No. that Harbin Engineering University proposes is the electromagnetism Negative stiffness spring of 105587812 B of CN, and stator is set It sets and is wound with coil on the outside of mover, mover, rectangle gear ring, mover rectangle gear ring is arranged in the working surface of mover and stator Corresponding with the position of stator rectangle gear ring and there is air gap between the two, Maxwell's tangential force between magnetic tooth forms negative rigid Degree.

Summary of the invention

In order to solve the above technical problems, the present invention provides a kind of adjustable quasi-zero stiffness vibration isolators based on magnetic Circuit Design, protects Low intrinsic frequency is realized in the case where demonstrate,proving big bearing capacity, promotes vibration isolating effect, while force density is big, and energy efficiency is high, uses It is convenient.

To achieve the above object, the present invention provides following schemes:

The present invention provides a kind of adjustable quasi-zero stiffness vibration isolators based on magnetic Circuit Design, including load platform, connection component, Positive rigidity carrier module, negative stiffness magnetic circuit module and control system, the negative stiffness magnetic circuit module includes external magnetic conduction shell, movable Axis, intermediate magnetic guiding loop, two end magnetic conductive axis and multiple connection magnetic conductive axis, the positive rigidity carrier module includes guiding axis, bullet Property component and adjusting nut, the guiding axis is installed on the top of the external magnetic conduction shell, the load platform, the elastic portion Part and the adjusting nut, which are from top to bottom successively arranged, to be installed on the guiding axis, the adjusting nut and the guiding axis spiral shell Line connection, the load platform pass through connection component and the movable axis connection, and can be together with the movable shaft along axial direction Movement；The movable shaft is set in the external magnetic conduction shell among two end magnetic conductive axis, two end magnetic conductions Axis and the movable shaft are coaxially disposed, and there are gap, two end magnetic conductions between the upper and lower end face of the movable shaft Axis is individually fixed in the top and bottom end of the external magnetic conduction shell；The intermediate magnetic guiding loop concentric gap is sheathed on the movable shaft Outside, the adjusting nut is for adjusting the load platform and the coupled movable shaft and the intermediate magnetic guiding loop Initial relative position；The both ends of each connection magnetic conductive axis are respectively and in the intermediate magnetic guiding loop and the external magnetic conduction shell Wall connects, and is arranged with a coil on each connection magnetic conductive axis respectively, is fixed with acceleration sensing on the external magnetic conduction shell Device, the acceleration transducer and the coil are connect with the control system.

Preferably, the connection component includes fixed ring and multiple connecting rods, and the Fixing shrink ring is set to the movable shaft Upper end, fixed with holding screw radially with the movable shaft, the connecting rod is parallel to each other with the guiding axis, each institute The both ends for stating connecting rod are connect with the load platform and the fixed ring respectively, and each connecting rod is through the external magnetic conduction It the top of shell and can move up and down relative to the external magnetic conduction shell.

Preferably, the control system includes computer, analog output module, power supply and analog input module, the mould Quasi- input module and the analog output module are connect with the computer respectively, and the acceleration transducer and the simulation are defeated Enter module connection, the power supply is connect with the analog output module, and the coil is connect with the power supply.

Preferably, the movable shaft and two end magnetic conduction shaft diameters are equal, and the axial height of the movable shaft is high In the axial height of the intermediate magnetic guiding loop.

Preferably, the intermediate magnetic guiding loop is mutually perpendicular to the connection magnetic conductive axis, described in the inner ring abutting of the coil The outer ring of magnetic conductive axis is connected, when coil working is passed through direct current, the magnetic direction for generating each coil while referring to To or away from the intermediate magnetic guiding loop.

It preferably, further include multiple shaft stools, each connection magnetic conductive axis can be fixed on by a shaft stool On the inner wall of the external magnetic conduction shell.

It preferably, further include linear bearing, the linear bearing is fixed on the center of the load platform, the guiding axis Across the linear bearing, and the linear bearing is sheathed on outside the guiding axis.

Preferably, the lower thread of the guiding axis is connected to the top upper surface of the external magnetic conduction shell.

Preferably, the elastomeric element is helical spring, rubber or flat spring.

The present invention achieves following technical effect compared with the existing technology:

Adjustable quasi-zero stiffness vibration isolators provided by the invention based on magnetic Circuit Design, including load platform, connection component, just The magnetic Circuit Design of rigidity carrier module, negative stiffness magnetic circuit module and control system, negative stiffness magnetic circuit module is distributed magnetic field concentration Among designed magnetic circuit, the utilization rate in magnetic field is greatly improved, it, can be with smaller power using Mace prestige normal force It realizes bigger negative stiffness, can realize quasi- zero stiffness with bigger positive Stiffness, and then can be used for the low frequency of heavy load Low intrinsic frequency is realized in vibration isolation in the case where guaranteeing big bearing capacity, promotes vibration isolating effect, capacity usage ratio is high, user Just, and in entire magnetic circuit system there is no the presence of permanent magnet, can be used in hot environment.It is controlled by setting control system Size of current, thus it is possible to vary the negative stiffness size that magnetic circuit generates, that is, change the intrinsic frequency of vibration isolator, so as to avoid The resonance of low frequency, further improves vibration isolating effect.

Detailed description of the invention

It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.

Fig. 1 is the system composition schematic diagram of the adjustable quasi-zero stiffness vibration isolators provided by the invention based on magnetic Circuit Design；

Fig. 2 is the axonometric drawing of the adjustable quasi-zero stiffness vibration isolators provided by the invention based on magnetic Circuit Design.

Description of symbols: 1, external magnetic conduction shell；2, end magnetic conductive axis；3, shaft stool；4, magnetic conductive axis is connected；5, centre is led Magnet ring；6, movable shaft；7, adjusting nut；8, elastomeric element；9, linear bearing；10, guiding axis；11, load platform；12, it connects Bar；13, fixed ring；14, coil；15, acceleration transducer；16, computer；17, analog output module；18, power supply；19, mould Quasi- input module.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

The object of the present invention is to provide a kind of adjustable quasi-zero stiffness vibration isolators based on magnetic Circuit Design, guarantee big bearing capacity In the case where realize low intrinsic frequency, promote vibration isolating effect, while force density is big, energy efficiency is high, easy to use.

In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real Applying mode, the present invention is described in further detail.

As shown in Figs. 1-2, the present embodiment provides a kind of adjustable quasi-zero stiffness vibration isolators based on magnetic Circuit Design, including load Platform 11, connection component, positive rigidity carrier module, negative stiffness magnetic circuit module and control system, negative stiffness magnetic circuit module include outer Portion's magnetic conduction shell 1, movable shaft 6, intermediate 5, two end magnetic conductive axis 2 of magnetic guiding loop and multiple connection magnetic conductive axis 4, positive rigidity carrier module Including guiding axis 10, elastomeric element 8 and adjusting nut 7.Guiding axis 10 is installed on the top of external magnetic conduction shell 1, load platform 11, Elastomeric element 8 and adjusting nut 7, which are from top to bottom successively arranged, to be installed on guiding axis 10, in this specific embodiment, guiding axis 10 are sheathed in light bar segment including from top to bottom sequentially connected light bar segment, thread segment and linkage section, load platform 11, and load is flat Platform 11 can axially move along guiding axis 10, and adjusting nut 7 is installed on thread segment, the lower thread that guiding axis 10 passes through it It is fixedly connected on the top upper surface of external magnetic conduction shell 1.Elastomeric element 8 is pressed to 7 upper end of adjusting nut, bullet by load platform 11 Property component 8 be used to support heavy load, load it is constant in the case where, the decrement of elastomeric element 8 determines that, rotating adjusting nut The initial position of 7 adjustable load platforms 11.When the negative stiffness for not having magnetic circuit to generate, only elastomeric element 8 is generated Positive rigidity, vibration isolator are in high natural frequency.Specifically, elastomeric element 8 is helical spring, rubber or flat spring.

Load platform 11 is connect by connection component with movable shaft 6, and can be with movable shaft 6 together axially movable, can Moving axis 6 is set in external magnetic conduction shell 1 among two end magnetic conductive axis 2, and two end magnetic conductive axis 2 and movable shaft 6 are coaxially disposed, And there are gap between the upper and lower end face of movable shaft 6, two end magnetic conductive axis 2 are individually fixed in the top of external magnetic conduction shell 1 And bottom end, the axial gap formed between movable shaft 6 and two end magnetic conductive axis 2 are determined by the impulse stroke of vibration isolator.It is intermediate 5 concentric gap of magnetic guiding loop is sheathed on outside movable shaft 6, between the radial direction of the inner ring surface of the outer ring surface of movable shaft 6 and intermediate magnetic guiding loop 5 Gap very little, elastomeric element 8 are pressed on 7 on adjusting nut, adjusting nut 7 can adjust load platform 11 and it is coupled can The initial relative position of moving axis 6 and intermediate magnetic guiding loop 5；It is led respectively with intermediate magnetic guiding loop 5 and outside at the both ends of each connection magnetic conductive axis 4 The inner wall of magnetic shell 1 connects, and each connect is arranged with a coil 14 respectively on magnetic conductive axis 4, the inner ring of coil 14 is close to connection magnetic conduction The outer ring of axis 4, coil 14 are passed through direct current when working, and make the magnetic direction of each generation of coil 14 while being directed toward or deviating from centre Magnetic guiding loop 5.Entire magnetic circuit, which is that coil 14 is powered, generates magnetomotive force, intermediate magnetic guiding loop 5 is arrived by connection magnetic conductive axis 4, by anchor ring Small air gap enters movable shaft 6, and passes through axial air-gap by the upper and lower end face of movable shaft 6 and respectively enter two end magnetic conductions up and down Axis 2 finally returns to connection magnetic conductive axis 4 by external magnetic conduction shell 1 and is closed, shaft section of the entire magnetic circuit in each connection magnetic conductive axis 4 Position is in the figure of eight (as indicated by the dashed line in figure 1), and such magnetic Circuit Design is to generate negative stiffness.In this specific embodiment In, magnetic circuit pass through part, except air gap in addition to all with the magnetic permeabilities such as electrical pure iron it is high material production, 304 steel of other parts or The material of the low permeabilities such as aluminium alloy makes, i.e., 5, two external magnetic conduction shell 1, movable shaft 6, intermediate magnetic guiding loop end magnetic conductive axis 2 It is all made of the high material production of the magnetic permeabilities such as electrical pure iron with multiple connection magnetic conductive axis 4, other component in addition to the above-mentioned parts It is all made of the material production of the low permeabilities such as 304 steel or aluminium alloy.

It is fixed with acceleration transducer 15 on external magnetic conduction shell 1, acceleration transducer 15 and coil 14 are and control system Connection.Specifically, the bottom of external magnetic conduction shell 1 is for installation on foundation base, and acceleration transducer 15 is for acquiring foundation base The acceleration signal of vibration.

Control system includes computer 16, analog output module 17, power supply 18 and analog input module 19, simulation input mould Block 19 and analog output module 17 are connect with computer 16 respectively, and acceleration transducer 15 is connect with analog input module 19, electricity Source 18 is connect with analog output module 17, and coil 14 is connect with power supply 18.

Specifically, connection component includes fixed ring 13 and multiple connecting rods 12, and fixed ring 13 is sheathed on the upper of movable shaft 6 End, fixed with movable shaft 6 with holding screw radially, connecting rod 12 is parallel to each other with guiding axis 10, and the two of each connecting rod 12 End connect with load platform 11 and fixed ring 13 respectively, and each connecting rod 12 runs through the top of external magnetic conduction shell 1 and can be relative to External magnetic conduction shell 1 moves up and down.In this specific embodiment, connecting rod 12 is set as two.

Specifically, movable shaft 6 and two 2 diameters of end magnetic conductive axis are equal.The axial height of movable shaft 6 is higher than intermediate magnetic conduction The axial height of ring 5.Intermediate magnetic guiding loop 5 is mutually perpendicular to magnetic conductive axis 4 is connect.It further include multiple shaft stools 3 in the present embodiment, respectively Connection magnetic conductive axis 4 can be fixed on the inner wall of external magnetic conduction shell 1 by a shaft stool 3.

In this specific embodiment, external magnetic conduction shell 1 includes cross top plate, cross bottom plate and four side plates, each side The top and bottom of plate are fixedly connected with cross top plate and cross bottom plate respectively.Two end magnetic conductive axis 2 are individually fixed in The lower end of cross top plate and the upper end of cross bottom plate, acceleration transducer 15 are set on cross bottom plate, each side plate One shaft stool 3 is installed, i.e., shaft stool 3, connection magnetic conductive axis 4 and coil 14 are disposed as four in the present embodiment on inner wall.

It further include linear bearing 9 in the present embodiment, linear bearing 9 is fixed on the center of load platform 11, and guiding axis 10 is worn Linear bearing 9 is crossed, and linear bearing 9 is sheathed on outside guiding axis 10.Friction is reduced by setting linear bearing 9, that is, is subtracted Few system damping rate.

When vibration isolator works, two end magnetic conductive axis 2 all attract movable shaft 6, and attraction reduces axial air-gap, and very It will be apparent that air gap is smaller, attraction is bigger.That is, when movable shaft 6 is in the middle position of intermediate magnetic guiding loop 5, two A end magnetic conductive axis 2 is equal to the attraction of movable shaft 6, and magnetic negative stiffness is in equilbrium position, and it is ideal that here it is vibration isolator systems Initial position.But once small disturbance is generated so that movable shaft 6 leaves equilbrium position, movable shaft 6 will continue far from flat Weighing apparatus position, and cannot be replied without external force.It can be seen that foring negative stiffness between movable shaft 6 and end magnetic conductive axis 2.And The positive rigidity power of helical spring can make load platform 11 return to equilbrium position after deviateing equilbrium position.Magnetic circuit generates negative The positive Stiffness that rigidity and helical spring generate, positive rigidity reply the power of power and negative stiffness far from equilbrium position of equilbrium position It cancels out each other, can produce quasi- zero stiffness, vibration isolator is in low intrinsic frequency, realizes good vibration isolating effect.It is vibrationless first Under beginning operating position, the center of the center of movable shaft 6 and intermediate magnetic guiding loop 5 should be at sustained height, and adjusting nut 7 is used in nothing The position of load platform 11 and coupled movable shaft 6 is conveniently adjusted under the original state of vibration, so that magnetic negative stiffness In equilbrium position, vibration isolator reaches ideal initial position.

However, there are also certain distance, low intrinsic frequencies apart from real zero stiffness for quasi- zero stiffness under the conditions of the prior art It is not lowered to 0, vibration isolator may still resonate at this low intrinsic frequency.It, can be with by controlling size of current Change the negative stiffness that magnetic circuit generates, that is, change the intrinsic frequency of vibration isolator, so as to avoid the resonance of low frequency, further Raising vibration isolating effect.Specific implementation method is: acceleration transducer 15 acquires the acceleration signal of foundation base vibration, passes through mould Quasi- input module 19 is converted to digital signal and gives computer 16, and computer 16 calculates extraneous vibration by frequency detecting algorithm Main frequency；When extraneous predominant oscillatory frequencies are higher than the low intrinsic frequency of vibration isolatorTimes when, 16 output signal of computer, And analog signal is converted to by analog output module 17, driving current, which is converted to, finally by power supply 18 is conveyed to coil 14, It can produce negative stiffness, vibration isolator is in quasi- zero stiffness at this time, and intrinsic frequency is lower, and vibration isolating effect is preferable；When dynamic excitation frequency Rate close to vibration isolator low intrinsic frequency when, vibration isolator may resonate, at this time 16 output signal of computer, and power supply 18 is closed It closes, negative stiffness disappears, that is, can switch to the high natural frequency of positive rigidity vibration isolator, avoid resonating.

It follows that the adjustable quasi-zero stiffness vibration isolators provided in this embodiment based on magnetic Circuit Design, negative stiffness magnetic circuit mould The magnetic Circuit Design of block is distributed in magnetic field concentration among designed magnetic circuit, and Distribution of Magnetic Field is excellent, greatly improves the benefit in magnetic field With rate, using Mace prestige normal force, it may be implemented bigger negative stiffness with smaller power, i.e., capacity usage ratio is high and generates Negative stiffness magnitude is high, can realize quasi- zero stiffness with bigger positive Stiffness, and then can be used for the low frequency vibration isolation of heavy load, Low intrinsic frequency to be realized in the case where guaranteeing big bearing capacity, promotes vibration isolating effect, energy efficiency is high, and it is easy to use, and There is no the presence of permanent magnet in entire magnetic circuit system, can be used in hot environment.It is big that electric current is controlled by setting control system It is small, thus it is possible to vary the negative stiffness size that magnetic circuit generates, that is, change the intrinsic frequency of vibration isolator, so as to avoid low frequency Resonance, further improves vibration isolating effect.

Apply that a specific example illustrates the principle and implementation of the invention in this specification, above embodiments Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, According to the thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion in this specification Appearance should not be construed as limiting the invention.