CN209353170U - A kind of negative stiffness vibration absorber - Google Patents
A kind of negative stiffness vibration absorber Download PDFInfo
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- CN209353170U CN209353170U CN201822121729.0U CN201822121729U CN209353170U CN 209353170 U CN209353170 U CN 209353170U CN 201822121729 U CN201822121729 U CN 201822121729U CN 209353170 U CN209353170 U CN 209353170U
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Abstract
The utility model relates to a kind of vibration absorbers, belong to track shock-absorption device field, are specifically related to a kind of negative stiffness vibration absorber.Include: the first spring, generates deformation in longitudinal direction when stress；Second spring, when stress, generate deformation in the horizontal direction；One end of the second spring is connected to the top of the first spring by connecting rod.Therefore, which can connect rubber spring by connecting rod and steel spring, load pass to steel spring by rubber spring and connecting rod, and steel spring increases and decreases the size of load by component of reaction, thus the rigidity functional requirement needed for realizing.
Description
Technical field
The utility model relates to a kind of vibration absorbers, belong to track shock-absorption device field, are specifically related to a kind of negative stiffness
Vibration absorber.
Background technique
Subway subtract vibration isolation there are low frequency vibration damping effects poor, safety of structure need to reinforce, vibration damping bring wave mill etc. it is derivative
The problems such as.The growth requirement of subway vibration damping be to solve low frequency vibration damping effect is poor, mass of vibration is limited, the rigidity that works it is sufficiently low
The problems such as with security of system is improved.
In recent years, as urban track traffic is towards web development, the structure type of subway damper rail is also increasingly
More, the design studies for damper rail are also more and more deep, and the construction of vibration-damping ballast is also gradually presented from cast-type to prefabricated
Board-like development trend, and what the vibration-damping function of prefabricated board was realized generally by steel spring, such vibration-proof structure its own
Intrinsic frequency is higher, and low frequency vibration damping effect is poor.
Rubber spring is low with its structure height, bearing capacity is big, and rigidity easily adjusts, the included damping of material, can provide multiple sides
To rigidity, cost is relatively low the features such as, be widely used in fields such as architectural vibration-insulation, vehicle vibration damping, equipment vibration dampings, but by
In rubber spring stress and deformation there are typical nonlinear characteristic, mass of vibration is bigger, and the rigidity of working range is bigger,
Cause between mass of vibration and rigidity that there are certain contradictions.
The feature of negative stiffness structure typical case is " high quiet low dynamic ", and lesser rigidity and good may be implemented in operation interval
Effectiveness in vibration suppression, but the application current and useless in the vibration damping of rail traffic.The structure of negative stiffness subtracts vibration isolation side precision instrument
Face achieves good effect, the especially inhibition to the vibration of low frequency, such as the seat of superior automobile, just uses negative stiffness
Structure.
Based on this, the utility model bound rubber spring and negative stiffness structural model are designed a kind of suitable for track vibration isolation
Rubber spring negative stiffness structure, the high-mechanic of Lai Shixian track, superlow frequency vibration isolating.
Utility model content
A brief summary of one or more aspects is given below to provide to the basic comprehension in terms of these.This general introduction is not
The extensive overview of all aspects contemplated, and be both not intended to identify critical or decisive element in all aspects also non-
Attempt to define the range in terms of any or all.Its unique purpose is to provide the one of one or more aspects in simplified form
A little concepts are with the sequence for more detailed description given later.
The main purpose of the utility model is the technology for being unable to satisfy superlow frequency vibration isolating solved in the presence of the prior art
Problem provides a kind of negative stiffness vibration absorber.The device connects rubber spring by connecting rod and steel spring, load pass through rubber
Spring and connecting rod pass to steel spring, and steel spring increases and decreases the size of load by component of reaction, thus needed for realizing
Rigidity functional requirement.
To solve the above problems, the embodiment of the utility model is:
A kind of negative stiffness vibration absorber, comprising:
First spring generates deformation in longitudinal direction when stress；
Second spring, when stress, generate deformation in the horizontal direction；
One end of the second spring is connected to the top of the first spring by connecting rod.
In at least one embodiment of the utility model, first spring is rubber spring, and the second spring is
Steel spring.
In at least one embodiment of the utility model, the top of first spring is provided with upper backup pad, described
The top of first spring is set in the groove of the upper backup pad bottom, and the connecting rod is connected to the first bullet by the support plate
The top of spring.
In at least one embodiment of the utility model, height-regulating device is provided on the upper backup pad.
In at least one embodiment of the utility model, institute's second spring be it is multiple, be respectively arranged at first bullet
The surrounding of spring.
In at least one embodiment of the utility model, further includes:
Mounting base, the bottom end of fixed first spring in middle part, around be provided with several for disposing described the
The opening of the spring base of two springs, the spring base is arranged towards first spring, the connecting rod two end respectively with the first bullet
The open end that the top of spring and second spring are located at the spring base is rotatably connected.
In at least one embodiment of the utility model, the bottom that the height of the spring base is higher than the first spring is high
Degree.
Therefore, the technical effect of the utility model is: the utility model can be combined rubber spring and steel spring with
It realizes superlow frequency vibration isolating, so that vibration isolation frequency band is widened, vibration isolation capability can be improved while guaranteeing system bearing ability.
Detailed description of the invention
Be incorporated herein and the attached drawing for forming part of specification instantiate the embodiments of the present invention, and attached drawing with
Specification is further used for explaining the principles of the present invention together and one of ordinary skill in the art is enabled to make and make
Use the disclosure.
Fig. 1 instantiates the stiffness curve schematic diagram in the utility model embodiment.
Fig. 2 instantiates the schematic top plan view of the vibration absorber in the utility model embodiment.
Fig. 3 instantiates the schematic cross-sectional view of Fig. 2.
Fig. 4-6 instantiates the load stress diagram of the utility model embodiment.
The embodiments of the present invention are described with reference to the accompanying drawings.
Specific embodiment
Embodiment
Rubber spring Static stiffness curve be it is non-linear, steel spring is then linear.The key of the present embodiment is mechanism to be passed through
Design so that rubber spring and steel spring is realized negative stiffness functional requirement.
The meaning for explaining negative stiffness first, definition is the load p that is born of elastic element to it by rigidity k
The change rate of caused deformation, that is,When load increases with deformation and increased, rigidity is positive；Load is not because deformation increases
When adding and changing, rigidity zero；When load is reduced instead with deformation increase, then rigidity is negative.The stiffness curve of negative stiffness such as Fig. 1
It is shown.
Negative stiffness performance requirement more than needing to reach needs rubber spring and steel spring stress when load early period loads
Direction is consistent, so that load increases with displacement and increased, steel spring and rubber spring Impact direction when arriving mid-term are on the contrary, displacement increases
Add and load reduction, the later period continues growing with displacement, rubber spring it is consistent again with steel spring Impact direction so that load again
Secondary increase.
By analysis, the realization of negative stiffness needs to enable by design specific structure the movement of rubber spring and steel spring
Change the size of load in different displaced segments, the utility model connects rubber spring by connecting rod and steel spring, load pass through rubber
Glue spring and connecting rod pass to steel spring, and steel spring increases and decreases the size of load by component of reaction, to realize institute
The rigidity functional requirement needed.
As Figure 2-3, the utility model is based on rubber spring 1, and rubber spring is fixed on mounting base 4
Interior, upper backup pad 3 and height-regulating device 2 are installed in top, play non-yielding prop, loading force is exactly to pass through to be passed to herein, steel spring 8
It is installed in spring base 6, steel spring 8 connects connecting rod 5 by attachment base 7 and upper backup pad 3 connects, in order to increase steel spring
It is allocated as firmly and stress balance, being evenly distributed with several steel springs in steel spring surrounding.
In the present embodiment, in load load phase early period, hollow rubber spring is pressurized, and surrounding steel spring compresses energization, always
Load and displacement increase；Mid-term load load phase, hollow rubber spring are pressurized, and energy, full payload drop are released in the rebound of surrounding steel spring
Low, displacement increases；Later period load load phase, hollow rubber spring are pressurized, and surrounding steel spring stretches energization, full payload and displacement
Increase, three phases realize negative stiffness function.The specific implementation process of the utility model is described below:
See Fig. 4, when load F is acted on rubber spring 1 by upper backup pad 3, rubber spring 1 starts deformation and generates instead
Active force, the power direction and F are on the contrary, in addition, load passes to the steel spring 8 of free state by connecting rod 5, so that steel spring 6
Compression also generates reaction force, and the component direction of the reaction force is consistent with the reaction force direction of rubber spring 1 upwards, resists
The effect of load F, with the increase of displacement, camber of spring is increased, and load F is also increasing, and produces such as stiffness curve figure above
0A section.
See Fig. 5, this is a critical state, and with the increase of displacement, connecting rod 5 is forced into horizontality, and steel spring 6 is compressed
To maximum displacement, reaction force is because direction is level, and longitudinal component is 0, so the active force of rubber spring 1 is equal to load F.
See Fig. 6, when load F is continued growing, displacement is more than critical state, and steel spring 6 will become tensional state, steel spring 6
The energy of storage becomes thrust, and force constituent direction is downward, can offset the active force of a part of rubber spring 1, at this time with
The increase load F of displacement can reduce, that is, AB section of stiffness curve, when displacement continues growing, steel spring 6 is stretched over oneself
By length, the component of steel spring 6 will become pulling force again, and component direction is again identical as 1 force direction of rubber spring, and load is opened again
Begin to increase, until maximum height limit, load and displacement are not increasing, completes a loading cycle.
In the present embodiment, although the above method to be illustrated to and is described as a series of actions to simplify to explain, answer
It is appreciated and understood that, the order that these methods are not acted is limited, because according to one or more embodiments, some movements can be by not
Occur with order and/or with from depicted and described herein or not shown herein and describe but those skilled in the art can be with
Other movements understood concomitantly occur.
It is noted that " one embodiment ", " embodiment ", " example embodiment ", " some embodiments " etc. in specification
Reference instruction described embodiment may include a particular feature, structure, or characteristic, but each embodiment may not necessarily include
The a particular feature, structure, or characteristic.Moreover, such phrase is not necessarily referring to the same embodiment.In addition, ought retouch in conjunction with the embodiments
When stating a particular feature, structure, or characteristic, regardless of whether being expressly recited, such feature, structure are realized in conjunction with other embodiments
Or characteristic will be in the knowledge of those skilled in the art.
Offer is to make any person skilled in the art all and can make or use this public affairs to the previous description of the disclosure
It opens.The various modifications of the disclosure all will be apparent for a person skilled in the art, and as defined herein general
Suitable principle can be applied to other variants without departing from the spirit or scope of the disclosure.The disclosure is not intended to be limited as a result,
Due to example described herein and design, but should be awarded and principle disclosed herein and novel features phase one
The widest scope of cause.
Claims (6)
1. a kind of negative stiffness vibration absorber characterized by comprising
First spring generates deformation in longitudinal direction when stress；
Second spring, when stress, generate deformation in the horizontal direction；
One end of the second spring is connected to the top of the first spring by connecting rod；
Mounting base, the bottom end of fixed first spring in middle part, around be provided with several for disposing second bullet
The opening of the spring base of spring, the spring base is arranged towards first spring, the connecting rod two end respectively with the first spring
The open end that top and second spring are located at the spring base is rotatably connected.
2. a kind of negative stiffness vibration absorber according to claim 1, which is characterized in that first spring is rubber bullet
Spring, the second spring are steel spring.
3. a kind of negative stiffness vibration absorber according to claim 1, which is characterized in that the top of first spring is arranged
There is upper backup pad, the top of first spring is set in the groove of the upper backup pad bottom, and connecting rod passes through the support plate
It is connected to the top of the first spring.
4. a kind of negative stiffness vibration absorber according to claim 3, which is characterized in that be provided with tune on the upper backup pad
High device.
5. a kind of negative stiffness vibration absorber according to claim 3, which is characterized in that institute's second spring is multiple, difference
It is set to the surrounding of first spring.
6. a kind of negative stiffness vibration absorber according to claim 1, which is characterized in that the height of the spring base is higher than the
The bottom level of one spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822121729.0U CN209353170U (en) | 2018-12-18 | 2018-12-18 | A kind of negative stiffness vibration absorber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822121729.0U CN209353170U (en) | 2018-12-18 | 2018-12-18 | A kind of negative stiffness vibration absorber |
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| CN209353170U true CN209353170U (en) | 2019-09-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109385937A (en) * | 2018-12-18 | 2019-02-26 | 浙江天铁实业股份有限公司 | A kind of negative stiffness vibration absorber |
| CN110594333A (en) * | 2019-09-27 | 2019-12-20 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Rigidity-adjustable vibration isolator |
-
2018
- 2018-12-18 CN CN201822121729.0U patent/CN209353170U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109385937A (en) * | 2018-12-18 | 2019-02-26 | 浙江天铁实业股份有限公司 | A kind of negative stiffness vibration absorber |
| CN110594333A (en) * | 2019-09-27 | 2019-12-20 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Rigidity-adjustable vibration isolator |
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