CN108691945A - A kind of resonance free peak damper of embedded negative stiffness dynamic vibration absorber - Google Patents
A kind of resonance free peak damper of embedded negative stiffness dynamic vibration absorber Download PDFInfo
- Publication number
- CN108691945A CN108691945A CN201810420802.6A CN201810420802A CN108691945A CN 108691945 A CN108691945 A CN 108691945A CN 201810420802 A CN201810420802 A CN 201810420802A CN 108691945 A CN108691945 A CN 108691945A
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- CN
- China
- Prior art keywords
- negative stiffness
- vibration absorber
- dynamic vibration
- damper
- disc spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F16F15/022—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 dampers and springs in combination
-
- 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
- F16F15/023—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 fluid means
-
- 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
-
- 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
- F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
- F16F2228/06—Stiffness
- F16F2228/063—Negative stiffness
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Combined Devices Of Dampers And Springs (AREA)
Abstract
The invention discloses a kind of resonance free peak damper of embedded negative stiffness dynamic vibration absorber, the damper includes:Upper connector, elastic element and lower connector, form a hollow cavity between three, and the damper further includes the dynamic vibration absorber being located in hollow cavity and negative stiffness component;The dynamic vibration absorber includes be cascaded from top to bottom elastic element and mass block;In the inside of elastic element, damping hole is set;The negative stiffness component is set to the lower end of mass block.The damper of the present invention can realize wide band vibration isolation under the conditions of big load carries, while realize resonance free peak with smaller quality cost, which has the advantages that compact-sized, easy for installation.
Description
Technical field
The present invention relates to the vibration isolation technique fields of precision instrument process equipment and seaborne machinery, and in particular in one kind
The resonance free peak damper of embedding negative stiffness dynamic vibration absorber.
Background technology
Occasion is produced in precision instrument process equipment, seaborne machinery etc., in order to which the vibration for reducing ground is flat to processing
Platform transmit, reduce equipment exciting force to hull base construction transmit, generally use vibration isolation technique, carry out passive insulation and actively
Vibration isolation.In current vibration isolation technique, in order to meet the requirement of stability, the isolation frequency of vibrating isolation system can not be usually designed
It is relatively low, it causes the frequency content of partial activation to be located at before the isolation frequency of vibrating isolation system, vibration isolation, or excitation can not be played the role of
Although frequency content be higher than isolation frequency, that leans on is relatively close, and vibrating isolation system is very limited for inhibiting vibration transmission effect.
In order to improve the above problem, a kind of method is using high quiet low dynamic vibration isolator, but high quiet low dynamic vibration isolator is still
The problems such as there are operating points relatively narrow, under dynamic exciting near operating point response amplitude is larger;Another method is using dynamic
Power bump leveller, extremely difficult for low-frequency excitation frequency content using dynamic vibration absorber, most important problem is to meet low frequency suction
Mass block needed for vibration frequency is very big.
At present since the quality of various kinds of equipment is larger, the installation space of vibration isolator is limited (to be subtracted especially for shipborne equipment
Shake device, especially true), therefore developed the damper of many big loads.For the damper of big load, due in intrinsic frequency
In the case that rate is certain, big load means big rigidity, and high quiet low dynamic to achieve the purpose that, the negative stiffness needed is also larger,
It realizes that big negative stiffness is difficult in the confined space, big load damper is realized high quiet low dynamic extremely difficult;Since power is inhaled
Shaking, there are one best mass ratioes (need to usually accomplish 0.1~0.2 or so) for mass block quality and the equipment quality of device, in limited sky
Between in for big load vibration isolator it is mating dynamic vibration absorber it is also extremely difficult.
Invention content
It is an object of the present invention to solve that current big load damper device quality is larger, the installation space of vibration isolator by
Limit, meets the very big problem of mass block needed for low frequency absorbing frequency.
To achieve the goals above, the present invention proposes a kind of resonance free peak vibration damping of embedded negative stiffness dynamic vibration absorber
Device is embedded with dampened power bump leveller on the basis of original vibration isolator, a negative stiffness element of connecting after the dampened power bump leveller
Equivalent inertia force is provided, plays the role of amplifying mass inertia, enhancing formant damping.
To achieve the above object, the present invention proposes a kind of resonance free peak damper of embedded negative stiffness dynamic vibration absorber, institute
Stating damper includes:Upper connector, elastic element and lower connector form a hollow cavity between three, which is characterized in that
The damper further includes the dynamic vibration absorber being located in hollow cavity and negative stiffness component;The dynamic vibration absorber include from
Be cascaded elastomer and mass block under;In the inside of elastomer, damping hole is set;The negative stiffness component setting
In the lower end of mass block.
As a kind of improvement of above-mentioned apparatus, the negative stiffness component is single group disc spring.
As a kind of improvement of above-mentioned apparatus, the negative stiffness component is the symmetrically arranged multigroup disc spring of circumference.
As a kind of improvement of above-mentioned apparatus, the disc spring is using special-shaped disc spring.
As a kind of improvement of above-mentioned apparatus, the abnormal shape disc spring is fluting disc spring.
As a kind of improvement of above-mentioned apparatus, the elastomer of the dynamic vibration absorber uses bellows, in the bellows
Portion is full of silicone oil viscous fluid.
As a kind of improvement of above-mentioned apparatus, the mass block of the dynamic vibration absorber uses big density material.
As a kind of improvement of above-mentioned apparatus, the ratio between the negative stiffness of the disc spring and the rigidity of elastomer between 0.08~
Between 0.1.
As a kind of improvement of above-mentioned apparatus, the stiffness at the end of the negative stiffness of the disc spring and the rigidity of bellows it is absolute
Rigidity of the value less than elastic element.
Advantage of the invention is that:
1, the resonance free peak damper structure of embedded negative stiffness dynamic vibration absorber of the invention is compact, principle is simple, installation
It is convenient, it meets and realizes wide band vibration isolation under the conditions of big load carries, while being realized without humorous with smaller quality cost
Shake peak;
2, the resonance free peak damper of a kind of embedded disc spring negative stiffness dynamic vibration absorber proposed by the present invention, meets broadband
Vibration isolation, nothing (small) resonance peak, have the advantages that quality is smaller.
Description of the drawings
Fig. 1 is the resonance free peak damper of the embedded single group disc spring negative stiffness dynamic vibration absorber of the embodiment of the present invention 1
Schematic diagram;
Fig. 2 is the resonance free peak damper for embedding multigroup disc spring negative stiffness dynamic vibration absorber of the embodiment of the present invention 2
Schematic diagram;
Fig. 3 is the schematic diagram of the resonance free peak damper of the present invention.
Attached drawing identifies
1, upper connector 2, elastic element 3, lower connector
4, bellows 5, mass block 6, disc spring
7, damping hole
Specific implementation mode
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
Embodiment 1
As shown in Figure 1, the resonance free peak damper of the embedded single group disc spring negative stiffness dynamic vibration absorber of the present invention is by following
Several parts are constituted:Upper connector 1, elastic element 2, lower connector 3, dynamic vibration absorber and single group disc spring 6.
The upper connector 1 is located at the top of whole device, and structure axisymmetricly, side inner concave is arc-shaped, bottom surface
It is a flat surface;
The elastic element 2 is located at below the upper connector 1, axisymmetricly structure, 2 upper surface of the elastic element
It is fitted closely with the arcuate side surface of 1 indent of upper connector, following table tilts upwardly;The elastic element 2 provides vibration isolation;
The lower connector 3 is located at below the elastic element 2, claims structure in axis, with elastic element 2 it is inclined under
Surface fits closely;
The elastic element 2 and 3 middle part of lower connector form the cavity of up-narrow and down-wide inner hollow;The dynamic vibration absorber
It is embedded in the hollow cavity, is connect with the bottom surface of the upper connector 1;The dynamic vibration absorber includes:4 He of bellows
Mass block 5, the bellows 4 is interior to be full of the viscous fluids such as silicone oil, damping hole 7 is arranged between the bellows 4, fluid flows through resistance
Damping is generated when Buddhist nun hole 7.
The disc spring 6 is set to below the mass block 5, is connected with mass block 5;The dynamic vibration absorber provides rigid
Degree is used for absorbing;The disc spring 6 constitutes the vibration insulating system of the present invention with the dynamic vibration absorber;The deformation of the bellows 4 carries
For rigidity;The bellows 4 is easier to design with vertical stiffness, lateral stiffness can compensate the cross such as 1 run-off the straight of upper connector
To the advantages of deformation so that disc spring 6 remains along the movement of its axial direction substantially;The axial deformation of bellows 4 is larger, even if dish
When 6 unstability of spring reaches capacity, the vertical stiffness of the bellows 4 still can provide the quality for meeting dynamic vibration absorber
Rigidity needed for the deformation of block 5;In order to match with the disc spring 6, the mass block 5 uses big density material.The disc spring 6
With the isolation frequency that the absorbing frequency that dynamic vibration absorber is constituted is the vibrating isolation system.The disc spring 6 has negative stiffness ability big
The advantages of.The negative stiffness of the disc spring 6 provides additional equivalent inertia force in vibration, can greatly reduce the dynamic absorber
Requirement of the device to the quality size of the mass block 5, simultaneously amplifies the vibration displacement of the mass block 5, to more significantly
The damping usefulness for increasing the offer of the damping hole 7 can significantly inhibit two mode peaks that the dynamic vibration absorber generates.
The resonance free peak damper of embedded disc spring negative stiffness dynamic vibration absorber of the present invention is acted in rated load
Under, understand compression elastic element 2 simultaneously and bellows 4 and disc spring 6 so that the disc spring 6 is in negative stiffness operating point, the disc spring
Also it is dynamic stiffness in 6 negative stiffness operating point.
The initial position of the disc spring 6 is its just unstable position, the initial position by the rigidity of elastic element 2,
The Static stiffness of dynamic vibration absorber and the Static stiffness of disc spring 6 are mutually matched to determine;Movement dominant bit of the disc spring 6 in absorbing
Shifting is determined by the amplitude of the dynamic vibration absorber, and the geometric parameter of disc spring 6 can guarantee its negative stiffness and the bellows 4
The absolute value of the stiffness at the end of rigidity is consistently less than the rigidity of elastic element 2.
In order to reach this purpose, the disc spring 6 may be needed using special-shaped disc spring, disc spring of such as slotting.
The resonance free peak damper of embedded disc spring negative stiffness dynamic vibration absorber of the present invention is realizing broadband vibration isolation
While, realize that the vibration amplification at vibration isolation and absorbing frequency is less than 3, to realize the vibration isolation of resonance free peak.
In the present invention, when the mass block 5 is with being 0.003 by the mass ratio of device for vibration insutation, the elastic element 4
Rigidity be designed according to isolation frequency, make the intrinsic frequency of the dynamic vibration absorber within ± the 5% of isolation frequency;
It is 0.08~0.1 to take the ratio between the negative stiffness of the disc spring 6 and the rigidity of elastic element 2, thus can get optimal resistance
When Buddhist nun is than about 0.13~0.15, realizes that the vibration amplification at vibration isolation and absorbing frequency is less than 3, resonance free can be approximately considered substantially
Peak.
Embodiment 2
The embodiment of the present invention 2 is as shown in Figure 2.By the single group disc spring in embodiment 1 be revised as circumference be arranged symmetrically it is more
Group disc spring, remaining part are identical as the corresponding component in embodiment 1.Mass block can be ensured using multigroup disc spring of the embodiment
Along vertical vibration, while the stability of support can be enhanced, multigroup disc spring synergistic effect can obtain it is more stable it is negative just
Spend characteristic.
As shown in figure 3, upper connector 1 and lower connector 3 are equivalent to the approximate rigidity of black shaded area, elastic element 2 etc.
Effect is spring ks, bellows 4 and mass block 5 are equivalent to spring keWith damping c, disc spring 6 is equivalent to negative stiffness kn(kn<0).Assuming that
The degree of freedom of mass block 5 is x, and the quality of mass block 5 is m, and when being vibrated with frequencies omega under the excitation of equipment, mass block 5 provides
Inertia force be-m ω2x<0, the power that disc spring 6 provides is knx<0, therefore the power that the inertia force of mass block 5 and disc spring 6 provide is same
Number, therefore disc spring 6 is equivalent to and provides a part of inertia force, and if you need to meet same absorbing frequency, increasing disc spring 6 can reduce pair
The requirement of mass block 5.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be understood by those of ordinary skill in the art that, to the technical side of the present invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Right in.
Claims (9)
1. a kind of resonance free peak damper of embedded negative stiffness dynamic vibration absorber, the damper include:Upper connector, elasticity member
Part and lower connector form a hollow cavity between three, which is characterized in that the damper further includes being located at hollow cavity
Interior dynamic vibration absorber and negative stiffness component;The dynamic vibration absorber includes be cascaded from top to bottom elastomer and quality
Block;In the inside of elastic element, damping hole is set;The negative stiffness component is set to the lower end of mass block.
2. the resonance free peak damper of embedded negative stiffness dynamic vibration absorber according to claim 1, which is characterized in that described
Negative stiffness component is single group disc spring.
3. the resonance free peak damper of embedded negative stiffness dynamic vibration absorber according to claim 1, which is characterized in that described
Negative stiffness component is the symmetrically arranged multigroup disc spring of circumference.
4. the resonance free peak damper of embedded negative stiffness dynamic vibration absorber according to claim 2 or 3, which is characterized in that
The disc spring is using special-shaped disc spring.
5. the resonance free peak damper of embedded negative stiffness dynamic vibration absorber according to claim 4, which is characterized in that described
Special-shaped disc spring is fluting disc spring.
6. the resonance free peak damper of the embedded negative stiffness dynamic vibration absorber according to one of claim 1-3, feature exist
In the elastomer of the dynamic vibration absorber uses bellows, the bellows interior to be full of silicone oil viscous fluid.
7. the resonance free peak damper of embedded negative stiffness dynamic vibration absorber according to claim 1, which is characterized in that described
The mass block of dynamic vibration absorber uses big density material.
8. the resonance free peak damper of embedded negative stiffness dynamic vibration absorber according to claim 2 or 3, which is characterized in that
The ratio between the negative stiffness of the disc spring and the rigidity of elastomer are between 0.08~0.1.
9. the resonance free peak damper of embedded negative stiffness dynamic vibration absorber according to claim 6, which is characterized in that described
The absolute value of the negative stiffness of disc spring and the stiffness at the end of the rigidity of bellows is less than the rigidity of elastic element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810420802.6A CN108691945A (en) | 2018-05-04 | 2018-05-04 | A kind of resonance free peak damper of embedded negative stiffness dynamic vibration absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810420802.6A CN108691945A (en) | 2018-05-04 | 2018-05-04 | A kind of resonance free peak damper of embedded negative stiffness dynamic vibration absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108691945A true CN108691945A (en) | 2018-10-23 |
Family
ID=63845321
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810420802.6A Withdrawn CN108691945A (en) | 2018-05-04 | 2018-05-04 | A kind of resonance free peak damper of embedded negative stiffness dynamic vibration absorber |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109681572A (en) * | 2018-11-30 | 2019-04-26 | 上海交通大学 | A kind of vibration isolation device and power-equipment |
| CN109780124A (en) * | 2019-01-18 | 2019-05-21 | 华东交通大学 | A kind of negative stiffness vibration absorber of parallel connection Frequency Adjustable |
| CN111140616A (en) * | 2020-01-14 | 2020-05-12 | 天津理工大学 | Negative stiffness enhanced nonlinear vibration absorber |
| WO2021224177A1 (en) * | 2020-05-06 | 2021-11-11 | Hasse & Wrede Gmbh | Spring system having a wide-band insulating effect |
| CN114737420A (en) * | 2021-11-03 | 2022-07-12 | 无锡希声科技有限公司 | Negative-rigidity steel rail damper and steel rail damping system |
| CN114754105A (en) * | 2022-04-24 | 2022-07-15 | 上海交通大学 | Negative-stiffness dynamic vibration absorption and isolation device for helicopter body and helicopter with negative-stiffness dynamic vibration absorption and isolation device |
-
2018
- 2018-05-04 CN CN201810420802.6A patent/CN108691945A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109681572A (en) * | 2018-11-30 | 2019-04-26 | 上海交通大学 | A kind of vibration isolation device and power-equipment |
| CN109681572B (en) * | 2018-11-30 | 2020-06-30 | 上海交通大学 | Active and passive vibration isolator and power equipment |
| CN109780124A (en) * | 2019-01-18 | 2019-05-21 | 华东交通大学 | A kind of negative stiffness vibration absorber of parallel connection Frequency Adjustable |
| CN111140616A (en) * | 2020-01-14 | 2020-05-12 | 天津理工大学 | Negative stiffness enhanced nonlinear vibration absorber |
| WO2021224177A1 (en) * | 2020-05-06 | 2021-11-11 | Hasse & Wrede Gmbh | Spring system having a wide-band insulating effect |
| CN114737420A (en) * | 2021-11-03 | 2022-07-12 | 无锡希声科技有限公司 | Negative-rigidity steel rail damper and steel rail damping system |
| CN114754105A (en) * | 2022-04-24 | 2022-07-15 | 上海交通大学 | Negative-stiffness dynamic vibration absorption and isolation device for helicopter body and helicopter with negative-stiffness dynamic vibration absorption and isolation device |
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Application publication date: 20181023 |