CN205278200U - Positive and negative rigidity low frequency isolator that connects in parallel - Google Patents
Positive and negative rigidity low frequency isolator that connects in parallel Download PDFInfo
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- CN205278200U CN205278200U CN201520935255.7U CN201520935255U CN205278200U CN 205278200 U CN205278200 U CN 205278200U CN 201520935255 U CN201520935255 U CN 201520935255U CN 205278200 U CN205278200 U CN 205278200U
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Abstract
The utility model relates to a positive and negative rigidity low frequency isolator that connects in parallel, including positive rigidity component, burden rigidity component, damping device, bear device, burden rigidity component support column and base strutting arrangement and just, burden rigidity component adjusting device, the utility model discloses the support column that wholly uses base strutting arrangement is central plane symmetry evenly distributed, it is parallelly connected based on positive and negative rigidity: burden rigidity component device comprises horizontal spring main part and sleeve, sliding block clamping screw, sliding block, sphere piece, connecting rod and lateral wall support articulated mounting, and positive rigidity is provided by perpendicular spring main part, and in addition, but damping device restraint system resonates and is the too drastic protection that provides, the initial position who adjusts perpendicular spring main part can satisfy different bear quality and vibration isolation requirements with the pre -compaction value of horizontal spring main part. The utility model discloses the parallelly connected problem that the installation of low frequency isolator is inconvenient, the structure is complicated, poor, the flexible nature of operating mode adaptability is poor, with high costs and the stability is lower of traditional positive and negative rigidity has effectively been improved to compact structure, regulation accuracy.
Description
Technical field
The utility model relates to a kind of positive and negative Stiffness low frequency vibration isolation device, particularly relating to the low frequency vibration isolation device of a kind of inclined springs negative stiffness structure, the utility model can be widely used in the low-frequency vibration control techniques field of the field plant and instrument such as mechanical industry, optics industry, semi-conductor industry, photographic chemistry.
Background technology
At present, urban track traffic, as one of most effective means alleviating urban traffic pressure, obtains fast development. But, its ambient vibration brought out is but day by day serious: the impact produced by track gravitational load during train operation, will cause track structural vibration, and vibration passes to buildings, plant and instrument etc. along sleeper, railway roadbed, ground etc., will cause serious ambient vibration. In these ambient vibrations, low-frequency vibration is the difficult point that ambient vibration is administered.
On the other hand, along with power machine maximization, light-weighted development, the soft degree of component continues to increase, and the low frequency Vibration that soft elastomerics causes is day by day serious. And conventional linear rigidity vibration isolation technique only exists(, ��, ��nIt is respectively the natural frequency of excitation frequency and system) just there is vibration isolating effect; Namely the soft degree of system parts strengthens, cause the above-mentioned formula left side to have to diminish, namely need anti-low-frequency vibration, and natural frequency when large-scale machinery high-mechanic often remains unchanged, the problem of anti-low frequency that system frequency height causes, isolation low-frequency vibration weak effect so just occurs; Even occur time serious that quiet distortion is excessive and unstability. Therefore, conventional steel spring vibration-isolator there will be the excessive problem of quiet distortion when isolating track low-frequency vibration, faces and can not take into account and the significant challenge of low frequency vibration isolation two aspect.
Just must reduce the natural frequency of system to improve low frequency vibration isolation ability, this will cause again the reduction of system stiffness, will inevitably cause the decline of the supporting capacity of system. Therefore conventional linear vibration isolator is when isolating low frequency, superlow frequency vibrating, faces Low rigidity and the contradiction of big quiet distortion two aspect. In order to reduce the harm of low-frequency vibration in engineering, people have studied various oscillation damping method, and creates corresponding various vibration control apparatus, and through retrieval, the document that the degree of correlation is big is as follows:
(1) in " vibration and impact " the 30th volume the 1st phase article " design of the non-linear passive vibrating isolation system of novel ultralow frequency " article in 2011, rigidity expression formula according to positive and negative Stiffness vibration isolation and equilibrium position zero stiffness condition, devise the passive vibrating isolation system of ultralow frequency of non-linear rigidity, solve a difficult problem for anti-superlow frequency vibrating. But, the articulated linkage of the positive and negative Stiffness mechanism of this article can only isolate the excitation in direction straight down, has negative stiffness structure design and realizes defect single, inflexible.
(2) publication number is CN101871505A, it is entitled as: the patent of invention of " a kind of positive and negative stiffness parallel three-translation vibration and impact isolation platform ", disclose three translational vibrations and the impact isolation platform of a kind of positive and negative Stiffness, have that supporting capacity is big, stability height, volume are little, natural frequency is low, damping is controlled, the advantage such as make and maintenance cost is low.
(3) publication number is CN202520846U, it is entitled as: the utility model patent of " a kind of low frequency vibration isolation device for basic excitation ", propose a kind of low frequency vibration isolation device utilizing the vertical linear spring of four inclined linear springs and to provide restorer, by the stability factor of the vertical spring of appropriate design and inclined springs and geometric parameter, the rigidity of system in statical equilibrium position is made to be zero, reach the object of the little rigidity of system dynamics, realize low frequency or superlow frequency vibration isolating, this vibration isolator is only made up of wire spring, so simple and compact for structure, it is easy to realize through engineering approaches. But, this kind requires complicated at superlow frequency vibration isolating, today that system composition is complicated and state is changeable, the single low frequency vibration isolation system expanding out according to principle, and the structure that seems is too simple, and adaptability, handiness and extensibility are weak.
(4) publication number is CN202520848U, title is the utility model patent of " a kind of ultralow frequency vibration isolator based on positive Negative stiffness spring parallel connection ", disclose a kind of ultralow frequency vibration isolator based on positive Negative stiffness spring parallel connection, it is made up of guidepost, cover lid, slide block, Negative stiffness spring, Xia Gai, guiding seat, ball and main spring, the utility model can realize the characteristic of high Static stiffness, low dynamic stiffness, realize zero hertz of superlow frequency vibration isolating, and anti-vibration performance is adjustable; Adopt ball to realize rolling resistance, reduce friction resistance; The utility model can be used as parts and is equipped with use, is applicable to bear the environment of vibration excitation, especially the environment of low-frequency vibration excitation, such as vehicle seat, suspension, and precision instrument vibration isolation, vibration damping antidetonation etc. But the negative stiffness characteristic frequency ranges of this vibration isolator depends on the degree of depth of the open holes of Negative stiffness spring that cover lid place offers, and can not freely carry out the adjustment of negative stiffness, have very big restricted, specific frequency or the low-frequency vibration of frequency section can only be isolated.
(5) publication number is CN203641365U, title is that the practical novel of " a kind of quasi-zero stiffness vibration isolators " discloses a kind of quasi-zero stiffness vibration isolators, four horizontal springs and a vertical spring is utilized to provide restorer, utilize roller-cam gear to connect horizontally moving device and vertical running gear, form a nonlinear geometry mechanism; By the stability factor of the vertical spring of appropriate design and horizontal spring, and regulate the draught of horizontal spring, make the rigidity of system in statical equilibrium position be zero, thus realize low frequency or superlow frequency vibration isolating. This vibration isolator has big Static stiffness petty action rigidity characteristic, and springrate ratio is very low, not only can realize low frequency vibration isolation, also can bear bigger equipment weight, and structure is simple, convenient processing and manufacture, is easy to realize through engineering approaches. The utility model vibration isolator has very high requirement for engineering processing and setting accuracy.
(6) publication number is CN102678804B, exercise question is: the patent of invention of " slip elastic beam and the non-linear ultralow frequency vibration isolator of spring assembly ", disclose a kind of non-linear ultralow frequency vibration isolator being made up of negative stiffness slip elastic beam and positive rigid spring, the overall system of the present invention has approximate dynamic accurate zero stiffness characteristic, it is possible to the isolating technique realizing ultralow frequency and have anti-impact effect concurrently. But, the vibration isolator of this invention has very strict requirement for the material behavior of slip elastic beam and setting accuracy in actual engineering, is unfavorable for that engineering is promoted.
The essential distinction of the application and practicality novel (5) is: positive stiffness means of the present utility model and negative stiffness device introduce the design that can carry out accurately adjustment; The essential distinction of novel from practicality (4) is: design and the vertical spring regulating device design of negative stiffness structure are different.
Summary of the invention
The purpose of this utility model is to install the problems such as inconvenience, complex structure, adaptability for working condition difference for existing low frequency vibration isolation device, it is proposed to a kind of positive and negative Stiffness low frequency vibration isolation device.
Core technology feature of the present utility model is: apply positive and negative Stiffness principle, it may also be useful to positive stiffness elements and negative stiffness element in parallel, suppresses system resonance in conjunction with the damping system installed additional and provides protection for too drastic situation; Positive stiffness and negative stiffness setting device realizes effectively and accurately regulating to meet different bearer quality and vibration isolation requirement of positive stiffness and negative stiffness scope.
The concrete technical scheme that the utility model adopts is as follows:
Comprise positive stiffness elements setting device, positive stiffness elements, negative stiffness component arrangement, negative stiffness element regulation device, damping system, bogey, negative stiffness element pillar stiffener and foot support device:
Wherein, described positive stiffness elements and vertical spring main body;
Wherein, described positive stiffness elements setting device is made up of circular sleeve, adjustment knob and wheel and spoke pressure transmitter;
Described negative stiffness component arrangement is made up of horizontal spring main body, horizontal spring sleeve, the fixing screw rod of slip block, slip block, spherical pieces, union lever and the hinged device of side wall support;
Described negative stiffness element regulation device regulates knob, fitting nut and S type pressure transmitter to form by double end stud, fixing framework, pre-compressed spring, precompressed setting nut, stud;
Described damping system is made up of web plate, piston damping device, adjustment backing plate;
Described bogey is by carrying platform and side wall support forms;
Described foot support device is made up of back up pad, disc base, support feet, pillar stiffener and linear bearings;
The spring number of described horizontal spring main body, vertical spring main body and pre-compressed spring is unique and adjustable is changed;
Described piston damping device number is unique and deoscillator model adjustable is changed;
The utility model face centered by the pillar stiffener of foot support device is symmetrical, and the connection of each integral part with installing pass is:
Positive stiffness elements setting device is fixed on below foot support device, wheel and spoke pressure transmitter with adjustment knob be connected, this sensor one end with by linear bearings pass bogey the side wall support straight bar of lower end be connected, the other end connects vertical spring main body; Vertical spring main body can be regulated by the adjustment knob being connected with hole in the middle of the circular sleeve of positive stiffness elements setting device, and wherein circular sleeve is fixed on the lower surface of back up pad; Vertical spring main body is installed in the circular sleeve of positive stiffness elements setting device, and upper end is connected with wheel and spoke pressure transmitter, and lower end is connected with adjustment knob; Negative stiffness component arrangement is installed on the through hole that negative stiffness element pillar stiffener top is offered, its horizontal spring body exterior is provided with horizontal spring sleeve, the inboardend of horizontal spring sleeve is connected to negative stiffness element pillar stiffener through hole outer wall, the movable end of horizontal spring main body connects slip block, and the slip block the other end is connected with the S type pressure transmitter of negative stiffness element regulation device; Slip block fixing screw rod is used to be fixed by slip block after the pre-press operation of horizontal spring main body; The horizontal spring main body the other end is provided with the spherical pieces that can do translational motion in horizontal spring sleeve, has offered hinged hole and be connected with union lever in spherical pieces, and the union lever the other end is also connected by the hinged device of articulated manner and side wall support; The other end of S type pressure transmitter is connected on a double end stud being fixed on negative stiffness element pillar stiffener inwall by fixing framework, fitting nut is fixedly connected with double end stud and S type pressure transmitter, double end stud is provided with pre-compressed spring, and carries out pressure adjustment by the precompressed setting nut of double end stud one end; Double end stud regulates knob to be connected with fixing framework by stud, and stud regulates knob can regulate the fixed position of double end stud; Setting nut in described negative stiffness element regulation device and double end Stud connection; Double end stud is connected with pre-compressed spring, and is connected with the S type pressure transmitter of feedback regulation nut force value;
Piston damping device is by being connected with back up pad inside the web plate of damping system, adjustment backing plate and side wall support: the adjustment backing plate of damping system and side wall support are connected to above the back up pad of foot support device, being fixed with piston damping device on adjustment backing plate, piston damping device top is connected to the inwall of side wall support by web plate; The side wall support lower straight bar of bogey is by the linear bearings of foot support device and is connected through its back up pad with the wheel and spoke pressure transmitter of positive stiffness elements setting device, and side wall support upper surface is connected with carrying platform; Negative stiffness element pillar stiffener lower surface is fixedly connected with support plate upper surface, and its upper through-hole place is fixedly connected with the fixing framework of negative stiffness element regulation device and the horizontal spring sleeve of negative stiffness component arrangement; Support feet is installed below the disc base of foot support device, pillar stiffener it is connected with above it, back up pad it is connected to above pillar stiffener, some circular sleeves it are fixed with below back up pad, vertical spring main body is installed in circular sleeve, regulates knob and wheel and spoke pressure transmitter, and vertical spring main body is installed on wheel and spoke pressure transmitter and regulates between knob.
Useful effect
A kind of positive and negative Stiffness low frequency vibration isolation device that the utility model proposes, its useful effect is mainly reflected in following several respects:
1. by adjusting, positive and negative rigidity value can realize vibration isolator rigidity reduction in the top/bottom latitude of statical equilibrium position to the utility model, so that this vibration isolator has high Static stiffness and the characteristic of low dynamic stiffness, can be applicable to low frequency and the superlow frequency vibration isolating fields such as vehicle, suspension, precision instrument;
2. positive stiffness elements setting device of the present utility model and vertical spring main body, negative stiffness component arrangement and damping system all can realize modularization and install, thus have compact overall structure rationally, the advantage of easy installation and removal;
3. disc base feet of the present utility model can promote the adaptability of complete installation vibration isolator, namely has installation and transportation advantage easily;
4. vertical spring main body of the present utility model and connected side wall support position can conveniently regulate, adopt pressure transmitter can realize accuracy and the consistence of the adjustment of vertical spring main body, the adjustment of statical equilibrium position can be realized, make vibration isolator have better stiffness characteristics, accurate adjustment can be realized;
5. the precompressed of horizontal spring main body of the present utility model is designed with pressure transmitter, and the pre-pressing force of horizontal spring is provided by pre-compressed spring and precompressed setting nut: the negative stiffness range regulation that can realize vibration isolator on the one hand, can realize again consistence and the accuracy of some horizontal spring preload pressures that negative stiffness element pillar stiffener outer wall is arranged on the other hand; And coordinate adjustment by the interior pressure transmitter of positive stiffness and negative stiffness elastic element setting device, it is possible to realize the consistence of the accurate of regulated quantity and some positive stiffness and negative stiffness element regulation;
6. the double end stud in negative stiffness component arrangement of the present utility model regulates knob to be fixed on fixing framework by stud, and by regulating stud to regulate knob to regulate the fixed position of double end stud and the position of mobile slip block, to install the horizontal spring main body of different lengths specification, such that it is able to make this vibration isolator meet different vibration isolation demand;
7. vertical spring main body of the present utility model can according to different bearer situation and vibration isolation requirement, the installation number increasing with reducing vertical spring, makes vibration isolator while ensureing vibration isolating effect, has better economy;
8. horizontal spring main body number of the present utility model can carry out adjusting and installing according to different vibration isolation requirement and positive and negative stiffness relation;
9. deoscillator model of the present utility model and quantity can change, and can suppress system resonance situation, and overload excitation situation protected, and namely have the strong advantage of self-protectiveness.
Accompanying drawing explanation
Fig. 1 is the system composition frame chart of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model and embodiment 1;
Fig. 2 is the composition structural representation of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model embodiment 1;
Fig. 3 is that the Z-Z of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model embodiment 1 is to sectional view;
Fig. 4 is the supporting plate structure schematic diagram of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model embodiment 1;
Fig. 5 is the side wall support structural representation of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model embodiment 1;
Fig. 6 is the structural representation of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model embodiment 2;
Fig. 7 is the vertical spring main body of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model embodiment 2 and the packaging assembly schematic diagram of negative stiffness element regulation device;
Fig. 8 is the displacement rigidity rational curve of a kind of positive and negative Stiffness low frequency vibration isolation device of the utility model when different statical equilibrium position;
Fig. 9 is the structural representation of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model embodiment 3;
Figure 10 is the horizontal spring main body of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model embodiment 3 and the structural representation of positive stiffness elements setting device;
Figure 11 is the structural representation of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model embodiment 4.
Description of reference numerals:
A in Fig. 1 is bogey; B is negative stiffness element pillar stiffener; C negative stiffness component arrangement, D negative stiffness element regulation device, E damping system, F is vertical spring main body, and G is backplanes support device, and H is positive stiffness elements setting device;
In Fig. 2 to Figure 11, label is unified, wherein: 1 is carrying platform, 2 is side wall support, 3 is fixing framework, 4 is web plate, 5 is back up pad, 6 is circular sleeve, 7 is disc base, 8 for supporting feet, 9 is pillar stiffener, 10 is negative stiffness element pillar stiffener, 11 is horizontal spring sleeve inboardend, 12 is the movable end of horizontal spring sleeve, 13 is spherical pieces, 14 is horizontal spring main body, 15 is slip block, 16 is the fixing screw rod of slip block, 17 is S type pressure transmitter, 18 is fitting nut, 19 is pre-compressed spring far-end set-up piece, 20 is pre-compressed spring, 21 pre-compressed spring near-end set-up pieces, 22 is precompressed setting nut, 23 is stud adjustment knob, 24 is double end stud, 25 is union lever, 26 is the hinged device of side wall support, 27 is piston damping device, 28 is adjustment backing plate, 29 linear bearingss, 30 is wheel and spoke pressure transmitter, 31 is vertical spring main body attachment spacers, 32 is vertical spring main body, 33 for regulating knob, 34 is linear bearings cooperation through hole, 35 is linear bearings installation threaded hole, 36 is adjustment backing plate open holes, 37 is pillar stiffener open holes, 38 is that the hinged device of side wall support inwall connects hole, 39 connect straight bar for the lower end of side wall support.
Embodiment
By reference to the accompanying drawings the utility model is described.
Embodiment 1
As shown in Figure 1, it is the system composition structure block diagram of a kind of positive and negative Stiffness low frequency vibration isolation device in the utility model and the present embodiment. Wherein, the connection relation of each comprising modules is as follows:
The lower end of bogey A and foot support device are connected; Negative stiffness element pillar stiffener B is fixed on the upper surface of foot support device G; By the through hole on negative stiffness element pillar stiffener B top, the negative stiffness element regulation device D inside negative stiffness element pillar stiffener B is connected with being fixed in negative stiffness component arrangement C one end, and the other end and bogey A are hinged; Damping system E is fixed on the upper surface of foot support device G and the side wall support with bogey A is connected, positive stiffness elements setting device H is fixed on foot support device G lower surface and the bogey A lower surface that connects with foot support device G is connected, vertical spring main body F is contained in positive stiffness elements setting device H, and foot support device G is fixed in certain plane base.
Further, specifically arriving the present embodiment, the complete structure of its each integral part is as shown in Figure 2,3; Wherein, Fig. 2 is the composition structural representation of a kind of positive and negative Stiffness low frequency vibration isolation device in the present embodiment; Fig. 3 is that the Z-Z of a kind of positive and negative Stiffness low frequency vibration isolation device in the present embodiment is to sectional view.
A kind of positive and negative Stiffness low frequency vibration isolation device proposed in the present embodiment comprises disc base 7, is fixed with and supports feet 8, strengthen the adaptability for working condition of this vibration isolator below disc base 7, it is fixed with pillar stiffener 9 by welding or bolt mode above disc base 7. it is bolted back up pad 5 above pillar stiffener 9, below back up pad 5, it has been fixed with six circular sleeves 6, vertical spring main body 32 has been installed in circular sleeve 6, with the utility model specification sheets main body the difference is that: the present embodiment 1 adds vertical spring main body attachment spacers 31 at vertical spring main body 32 two ends, being fixed with in the lower section of vertical spring main body attachment spacers 31 and regulate knob 33, top is fixed with wheel and spoke pressure transmitter 30, the top of wheel and spoke pressure transmitter 30 is connected with the lower straight bar of side wall support 2, and lower straight bar and the back up pad 5 of side wall support 2 are connected by linear bearings 29, four adjustment backing plates 28 it are bolted above back up pad 5, fixed piston deoscillator 27 above adjustment backing plate 28, being fixed by pin between piston damping device 27 upper plunger bar and deoscillator web plate 4, web plate 4 is fixedly connected with by bolt mode with the inwall of side wall support 2 by bolt. negative stiffness element pillar stiffener 10 lower surface is fixed on the upper surface of back up pad 5 by welding process, symmetrical above negative stiffness element pillar stiffener 10 6 through holes are offered altogether, through hole inwall has been bolted fixing framework 3, double end stud 24 regulates knob 23 to be fixed on fixing framework 3 by stud, precompressed setting nut 22 is fixed on double end stud 24, another side of precompressed setting nut is the pre-compressed spring near-end set-up piece 21 being fixedly connected with pre-compressed spring 20, double end stud 24 provides guide effect for pre-compressed spring 20, pre-compressed spring 20 the other end is fixedly connected with pre-compressed spring far-end set-up piece 19, compress with fitting nut 18 on the right side of pre-compressed spring far-end set-up piece 19 and it is connected, S type pressure transmitter 17 is connected with the far-end of double end stud 24 by pressure transmitter fitting nut 18, S type pressure transmitter 17 the other end is fixedly connected with slip block 15, horizontal spring main body 14 two ends are fixedly connected with spherical pieces 13 with slip block 15, spherical pieces 13 is provided with hinged hole, union lever 25 by articulated manner two ends respectively device 26 hinged with spherical pieces 13 and side wall support be connected, negative stiffness element pillar stiffener 10 is fixedly connected with horizontal spring sleeve inboardend 11 and fixing framework 3 in through hole by bolt mode, and the guide effect that the horizontal spring main body 20 that plays horizontal spring sleeve inboardend 11 moves, horizontal spring sleeve inboardend 11 has offered threaded hole, the fixing screw rod 16 of slip block can be fixed by threaded hole and the slip block 15 offered on horizontal spring sleeve inboardend 11, is bolted to connection between the movable end 12 of horizontal spring sleeve and horizontal spring inboardend 11, carrying platform 1 is bolted to connection with side wall support 2 upper surface.
Working process and the principle of a kind of novel positive and negative Stiffness low frequency vibration isolation mechanism in the present embodiment are as follows:
Under outside incentive action, carrying platform 1 can drive side wall support 2 to move together, vertical spring main body and piston damping device meeting one are worked, system stiffness is had an impact under being hinged on the effect of the union lever 25 of side wall support inwall by horizontal spring main body 14, thus makes integral vibration isolation device produce vibration isolating effect;
Positive and negative stiffness elements is in parallel, by the installation number of the rigidity value of suitable selection spring of all categories and vertical spring main body and horizontal spring main body, it is achieved the present embodiment vibration isolator is at the accurate zero stiffness of statical equilibrium position;
Negative stiffness element pillar stiffener 10 welding process is connected with back up pad 5, negative stiffness element pillar stiffener is the symmetrical tabular element in two faces centered by pillar stiffener, and the through hole offered on each tabular member upper end face is connected (as shown in Figure 3) with negative stiffness element regulation device and negative stiffness element.
When encouraging amplitude excessive, integral vibration isolation device can be formed protection by piston damping device, and piston damping device can suppress system to resonate, in order to avoid system being damaged. The back up pad of the present embodiment and the structural representation of side wall support are as shown in Figure 4 and Figure 5, identical in number in the figure and Fig. 1, specifically see that accompanying drawing annotates.
Embodiment 2
Fig. 6 show the structural representation of a kind of positive and negative Stiffness low frequency vibration isolation device of the present embodiment; Fig. 7 is vertical spring and the assembling regulatory element structural representation thereof of a kind of positive and negative Stiffness low frequency vibration isolation device in the present embodiment. With example 1 basic simlarity, difference be by adjustment knob 33 and wheel and spoke pressure transmitter 30 with the use of, it is ensured that the accuracy of the regulated quantity of all vertical springs and consistence.
If during the carrying quality change of system, during the statical equilibrium position of system, union lever 25 is not horizontality, now can by rotation of adjustment knob 33 and coordinate wheel and spoke pressure transmitter 30 to use, make some vertical spring regulated quantitys accurately with consistent.
Displacement rigidity rational curve when Fig. 8 is the utility model one positive and negative Stiffness low frequency vibration isolation device difference statical equilibrium position.
The statical equilibrium position of mobile vibration isolator, makes vibration isolator when statical equilibrium position, and union lever 25 is in horizontality, and now system has better negative stiffness characteristic. When statical equilibrium position, union lever is in horizontality, and near equilibrium theory of tide, rigidity value is that symmetry status and rigidity reduce, and this negative stiffness characteristic can select quantity and the stiffness ratio of positive negative stiffness elastic element easily, carries out system isolation; If union lever 25 is in heeling condition during statical equilibrium position.
From the displacement rigidity curve Fig. 8 it may be seen that the rigidity of system is increase near statical equilibrium position, being unfavorable for negative stiffness vibration isolation, when should avoid statical equilibrium position in the application, there is heeling condition in union lever 25 as far as possible.
Embodiment 3
Fig. 9 show the structural representation of a kind of positive and negative Stiffness low frequency vibration isolation device of the present embodiment. The horizontal spring main body of a kind of positive and negative Stiffness low frequency vibration isolation device that Figure 10 show in the present embodiment and the structural representation of positive stiffness elements setting device.
With example 1 basic simlarity, difference be by precompressed setting nut 22 and S type pressure transmitter 17 with the use of, such as the pressure of pre-compressed spring, thus continue the pre compressed magnitude of adjustment horizontal spring main body 14, and ensure accuracy and the consistence of the pre compressed magnitude of some horizontal spring main bodys. After completing the adjustment of horizontal spring main body pre compressed magnitude, by horizontal spring near-end slip block fixing screw rod 16, slip block 15 is fixed. By the pre compressed magnitude of level of control spring main body, it is possible to realize the adjustment to system negative stiffness characteristic range. When system statical equilibrium position, horizontal spring main body is positioned at horizontality place, can show that by the dynamics of horizontal spring the elastic force of horizontal spring vertical direction is:
Wherein l is the length of union lever, and x is the hinged device displacement of side wall support, khFor horizontal spring rigidity, n is the number of horizontal spring main body, fhFor the elastic force of horizontal spring in vertical direction.
If horizontal spring main body precompressed amount is �� l, then the calculating restricted condition of horizontal spring body elastic power isNamelyNamely different horizontal spring main bodys is noted with precompressed amount �� l, corresponding different x spans, i.e. the negative stiffness scope of vibration isolator, can directly affect the low frequency vibration isolation scope of vibration isolator, according to different vibration isolation requirements and working condition requirement, select suitable horizontal spring main body precompressed amount.
Embodiment 4
The structural representation that Figure 11 show in the present embodiment a kind of positive and negative Stiffness low frequency vibration isolation device. Substantially similar with embodiment 1, difference is by regulating stud to regulate knob 23, it is possible to realize the adjustment of the fixed position of double end stud 24. Pre-compressed spring 20 on the S type pressure transmitter 17 that is fixedly connected with double end stud and double end stud therebetween coordinates fixing pre-compressed spring far-end set-up piece 19, pre-compressed spring near-end set-up piece 21 that position all can be occurred to change (as shown in Figure 10);
For automotive vibration isolation field, corresponding automobile bears main body " people ", human body is when bearing whole body and vibrate, vibration frequency range the most responsive in vertical direction is 4��8Hz, vibration frequency range the most responsive in horizontal direction is 1��2Hz, it is possible to is arranged on by the vibration isolator of the application on suspension and seat and carries out two grades of vibration isolation; And for precision instrument vibration isolation field, different vibration isolation requirements is had for different precision instruments, owing to adopting positive and negative Stiffness mode, system has the characteristic of the low dynamic stiffness of high Static stiffness, when not influential system supporting capacity, adopt the quantity of different positive and negative stiffness elements and stiffness ratio can realize the different stiffness characteristics of system, thus meet the low frequency vibration isolation demand of different field.
Above-described embodiment 1 to embodiment 4 is the better embodiment of a kind of positive and negative Stiffness low frequency vibration isolation device of the utility model, and the utility model should not be confined to the content disclosed in this embodiment and accompanying drawing. Every do not depart from practical novel disclosed spirit under the equivalence that completes or amendment, all fall into the scope of the utility model protection.
Claims (1)
1. a positive and negative Stiffness low frequency vibration isolation device, it is characterised in that:
Comprise positive stiffness elements setting device, positive stiffness elements, negative stiffness component arrangement, negative stiffness element regulation device, damping system, bogey, negative stiffness element pillar stiffener and foot support device:
Wherein, described positive stiffness elements is vertical spring main body;
Described positive stiffness elements setting device is made up of circular sleeve, adjustment knob and wheel and spoke pressure transmitter;
Described negative stiffness component arrangement is made up of horizontal spring main body, horizontal spring sleeve, slip block, spherical pieces, union lever and the hinged device of side wall support;
Described negative stiffness element regulation device regulates knob, fitting nut and S type pressure transmitter to form by double end stud, fixing framework, pre-compressed spring, precompressed setting nut, stud;
Described damping system is made up of web plate, piston damping device, adjustment backing plate;
Described bogey is by carrying platform and side wall support forms;
Described foot support device is made up of back up pad, disc base, support feet, pillar stiffener and linear bearings;
Described horizontal spring main body, vertical spring main body and compress that the spring number of spring is unique and adjustable is changed;
Described piston damping device number is unique and adjustable is changed;
Connecting and installing around face centered by the pillar stiffener by foot support device symmetrical of its each integral part, is specially:
Positive stiffness elements setting device is fixed on below foot support device, wheel and spoke pressure transmitter with adjustment knob be connected, this sensor one end with by linear bearings pass bogey the side wall support straight bar of lower end be connected, the other end connects vertical spring main body; Vertical spring main body can be regulated by the adjustment knob being connected with hole in the middle of circular sleeve, and wherein circular sleeve is fixed on the lower surface of back up pad; Vertical spring main body is installed in the circular sleeve of positive stiffness elements setting device, and upper end is connected with wheel and spoke pressure transmitter, and lower end is connected with adjustment knob; Negative stiffness component arrangement is installed on the through hole that horizontal spring pillar stiffener top is offered, its horizontal spring body exterior is provided with horizontal spring sleeve, the inboardend of horizontal spring sleeve is connected to horizontal spring pillar stiffener through hole outer wall, the movable end of horizontal spring main body connects slip block, and the spherical pieces the other end is connected with the S type pressure transmitter of negative stiffness element regulation device; The horizontal spring main body the other end is provided with the spherical pieces that can do translational motion in horizontal spring sleeve, has hinged hole to be connected with union lever in spherical pieces, and the union lever the other end is also connected by the hinged device of articulated manner and side wall support; The other end of S type pressure transmitter is connected on a double end stud being fixed on horizontal spring pillar stiffener inwall by fixing framework, fitting nut is fixedly connected with double end stud and S type pressure transmitter, double end stud is provided with pre-compressed spring, and carries out pressure adjustment by the precompressed setting nut of double end stud one end; Double end stud regulates knob to be connected with fixing framework by stud; Setting nut in described negative stiffness element regulation device and double end Stud connection; Double end stud is connected with pre-compressed spring, and is connected with the S type pressure transmitter of feedback regulation nut force value;
Piston damping device is by being connected with back up pad inside the web plate of damping system, adjustment backing plate and side wall support: the adjustment backing plate of damping system and side wall support are connected to above the back up pad of foot support device, being fixed with piston damping device on adjustment backing plate, piston damping device top is connected to the inwall of side wall support by web plate; The side wall support lower straight bar of bogey is by the linear bearings of foot support device and is connected through its back up pad with the wheel and spoke pressure transmitter of positive stiffness elements setting device, and side wall support upper surface is connected with carrying platform; Pillar stiffener lower surface is fixedly connected with support plate upper surface, and its upper through-hole place is fixedly connected with the fixing framework of negative stiffness element regulation device and the horizontal spring sleeve of negative stiffness component arrangement; Support feet is installed below the disc base of foot support device, pillar stiffener it is connected with above it, back up pad it is connected to above pillar stiffener, some circular sleeves it are fixed with below back up pad, vertical spring main body is installed in circular sleeve, regulates knob and wheel and spoke pressure transmitter, and vertical spring main body is installed on wheel and spoke pressure transmitter and regulates between knob.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520935255.7U CN205278200U (en) | 2015-11-21 | 2015-11-21 | Positive and negative rigidity low frequency isolator that connects in parallel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520935255.7U CN205278200U (en) | 2015-11-21 | 2015-11-21 | Positive and negative rigidity low frequency isolator that connects in parallel |
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| CN205278200U true CN205278200U (en) | 2016-06-01 |
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| CN201520935255.7U Expired - Fee Related CN205278200U (en) | 2015-11-21 | 2015-11-21 | Positive and negative rigidity low frequency isolator that connects in parallel |
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| CN106763466A (en) * | 2015-11-21 | 2017-05-31 | 北京工业大学 | A kind of novel positive and negative Stiffness low frequency vibration isolation mechanism |
| CN108518439A (en) * | 2018-03-08 | 2018-09-11 | 东北大学 | A kind of adjustable bump leveller of rotor-support-foundation system adjusted with piezoelectric ceramics |
| CN110107643A (en) * | 2019-04-25 | 2019-08-09 | 华东交通大学 | A kind of array transverse direction negative stiffness vibration absorber |
| CN110285182A (en) * | 2019-07-12 | 2019-09-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | The vibration isolator of high quiet low dynamic stiffness characteristic and rail system with it |
| CN110285180A (en) * | 2019-07-12 | 2019-09-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | The vibration isolator of high quiet low dynamic stiffness characteristic and rail system with it |
| CN110285181A (en) * | 2019-07-12 | 2019-09-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | The vibration isolator of high quiet low dynamic stiffness characteristic and rail system with it |
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| CN108518439A (en) * | 2018-03-08 | 2018-09-11 | 东北大学 | A kind of adjustable bump leveller of rotor-support-foundation system adjusted with piezoelectric ceramics |
| IT201800007222A1 (en) * | 2018-07-16 | 2020-01-16 | Negative stiffness modular device for vertical seismic isolation | |
| CN110107643A (en) * | 2019-04-25 | 2019-08-09 | 华东交通大学 | A kind of array transverse direction negative stiffness vibration absorber |
| CN110285182A (en) * | 2019-07-12 | 2019-09-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | The vibration isolator of high quiet low dynamic stiffness characteristic and rail system with it |
| CN110285181A (en) * | 2019-07-12 | 2019-09-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | The vibration isolator of high quiet low dynamic stiffness characteristic and rail system with it |
| CN110285180A (en) * | 2019-07-12 | 2019-09-27 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | The vibration isolator of high quiet low dynamic stiffness characteristic and rail system with it |
| CN110285182B (en) * | 2019-07-12 | 2024-04-09 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Vibration isolator with high static and low dynamic stiffness characteristics and track system with vibration isolator |
| CN110285181B (en) * | 2019-07-12 | 2024-04-09 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Vibration isolator with high static and low dynamic stiffness characteristics and track system with vibration isolator |
| CN110285180B (en) * | 2019-07-12 | 2024-04-09 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Vibration isolator with high static and low dynamic stiffness characteristics and track system with vibration isolator |
| CN113202898A (en) * | 2021-05-27 | 2021-08-03 | 长沙理工大学 | Ultralow frequency vibration isolation device with real-time adjustable natural frequency |
| CN113202898B (en) * | 2021-05-27 | 2022-06-21 | 长沙理工大学 | Ultralow frequency vibration isolation device with real-time adjustable natural frequency |
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| CN115727094A (en) * | 2022-11-29 | 2023-03-03 | 武汉理工大学 | Compact low-frequency vibration isolation device with parallel magnetic negative stiffness structure |
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