CN202203331U - Tiny precise resonance-free vibration isolation device based on dry friction damp - Google Patents
Tiny precise resonance-free vibration isolation device based on dry friction damp Download PDFInfo
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- CN202203331U CN202203331U CN2011202393948U CN201120239394U CN202203331U CN 202203331 U CN202203331 U CN 202203331U CN 2011202393948 U CN2011202393948 U CN 2011202393948U CN 201120239394 U CN201120239394 U CN 201120239394U CN 202203331 U CN202203331 U CN 202203331U
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- vibration isolation
- isolation device
- connecting plate
- traveller
- device based
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Abstract
The utility model discloses a tiny precise resonance-free vibration isolation device based on dry friction damp. The tiny precise resonance-free vibration isolation device is characterized by comprising a sliding column, four rigid springs, a damping spring, an upper connecting plate, a lower connecting plate and a shell, wherein the upper end of the sliding column is fixed on the upper connecting plate; the lower connecting plate and the shell are fixed; the rigid springs and the damping spring are fixed on the lower connecting plate; the other end of each rigid spring is connected with the lower end of the sliding column; and the other end of the damping spring is tightly matched with the side face of the sliding column. In the vibration isolation device, the four abnormally-shaped rigid springs supply very low longitudinal and transverse rigidity, so that a vibration isolation system has lower fixed frequency under vibration excitation. Compared with the prior art, the tiny precise resonance-free vibration isolation device has the advantages of small volume and high stability.
Description
Technical field:
The utility model is a kind of isolation mounting of little quality precision equipment.Be particularly useful for the safe vibration isolation protection of precision equipment all directions such as crystal oscillator, micro harddisk, the anti-vibration and shock that belongs to sophisticated electronics is made the field.
Background technique:
Along with the manufacturing technology rapid development, more and more towards integrated, miniaturization, light development, these precision type instrument often carry in mobile devices such as aircraft, man-made satellite, naval vessels and tank some precision type instrument.Because the abominable Environmental Conditions of these equipment has proposed increasingly high requirement to the antijamming capability of precision electronic device under environment such as vibration, impact, centrifugal acceleration and noise.In order to improve system accuracy and reliability, must take vibration isolation measure to adapt to the ability of working under the various severe environmental conditions to small precision type instrument to improve it.Simultaneously because small precision type instrument itself is in light weight, volume is little, its isolation mounting except having good vertical and horizontal vibration reduction and cushioning performance, also necessary in light weight, volume is little, good stability.
Existing vibration isolator mainly is that the weight and volume of vibration isolator own is far longer than small precision type instrument, is not suitable for small precision type instrument to big load electronic device design; Few part is directed against the vibration isolator of crystal oscillator, and complex structure is very high to the Environmental Conditions requirement, under impulsive load, is prone to cause the vibration isolator actual effect.
Summary of the invention
Technical problem:
The utility model technical problem to be solved is the deficiency to above-mentioned existing technology; And provide a kind of in light weight, volume is little, good stability, vibration isolator easy to use, mainly apply to move on the carrier be the non-resonant vibration isolation device of small precision type instrument anti-vibration and shock.
Technological scheme:
The technological scheme that its technical problem that solves the utility model adopts is: a kind of small accurate non-resonant vibration isolation device based on dry-friction damping; It is characterized in that: comprise traveller, rigid spring, damping spring, upper junction plate, lower connecting plate and shell; Described traveller upper end is fixed on the described upper junction plate; Described lower connecting plate and described shell are fixed; Fixing described rigid spring and damping spring on lower connecting plate, the other end of rigid spring is connected with the lower end of traveller, and the other end of damping spring and the side of traveller closely cooperate.
Described traveller is the polygonal traveller.
Described rigid spring is four.
Described shell adopts bolt to be connected with lower connecting plate.
Since very little by the quality of shock insulation object, in order to guarantee the low natural frequency of shock isolation system, need very little rigidity.In this shock-proof device, four special-shaped rigid springs provide very little vertical and lateral stiffness, guarantee that shock isolation system has lower natural frequency when receiving vibrational excitation.When shock isolation system receives when impacting; Contacting of the special-shaped rigid spring of upper junction plate with last circular arc portion; Damping spring closely contacts with traveller, when traveller and damping spring relative movement or when relative movement trend is arranged, has frictional force between the two; This provides damping force to system, consumes the energy that shakes and dash.
Compared with prior art, the utility model non-resonant vibration isolation device volume is little, good stability.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Fig. 2 is the structural representation of the utility model rigid spring.
Fig. 3 is the vibration isolation plotted curve of the utility model isolation mounting.
Embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated:
As shown in Figure 1, the utility model isolation mounting has four holes to be connected with precision type instrument on upper junction plate 1, and upper junction plate 1 is connected with traveller 2 tops through bolt, and traveller 2 is a polygonal, in the present embodiment, is the Octagon traveller.The bottom of traveller 2 is connected with four rigid springs 3 with screw, the side interference fit of damping spring 4 tops and traveller 2, and all rivet with lower connecting plate 5 bottom of rigid spring 3 bottoms and damping spring 4, and the structural representation of rigid spring 3 is as shown in Figure 2.Shell 6 is connected with lower connecting plate 4 through screw thread, links to each other with the basis of electronic equipment.
Working principle:
This shock isolation system damping spring closely contacts with traveller, and damping spring has positive pressure
to traveller.When traveller and damping spring relative movement or when relative movement trend is arranged, there is frictional force between the two, this provides damping force to system.Therefore, this system can be expressed as:
In the formula:
is by the quality of shock insulation object;
is stiffness coefficient, and
is friction factor;
is rubbing surface normal direction positive pressure;
is sign function.
When system receives
basic excitation that displacement is; Be that the basis receives when excitation force is
, shock isolation system is by the energy of dry-friction damping consumption vibration.According to energy efficiency principle, can obtain the equivalent viscous damping coefficient
of shock isolation system:
The equivalent viscous damping of system can be expressed as than
:
According
is not difficult to calculate the dry friction damping system for steady-state forced vibration amplitude
:
With the following formula substitution, the amplitude that obtains steady-state vibration is:
It is thus clear that; During as
; With mass block and basis " lock " together, mass block does not produce and basic relative vibration Coulomb damping power on the structure; When having only as
; Mass block and basis can " releases ", and vibration could continue.
When dry-friction damping power satisfied condition
, the vibration transmissibility of vibration system was:
With formula and substitution following formula, can obtain:
When dry-friction damping power satisfies condition
; Mass block does not produce the relative vibration with the basis, i.e.
.
Therefore, exist the vibration system vibration transmissibility of dry-friction damping to be:
Structure through the adjustment damping spring; Can obtain suitable frictional force
; Make shock isolation system be implemented in not resonance amplification under the dynamic excitation; Be that shock isolation system does not have resonance, its shock insulation curve is as shown in Figure 3.
Claims (4)
1. small accurate non-resonant vibration isolation device based on dry-friction damping; It is characterized in that: comprise traveller, rigid spring, damping spring, upper junction plate, lower connecting plate and shell; Described traveller upper end is fixed on the described upper junction plate, and described lower connecting plate and described shell are fixed, fixing described rigid spring and damping spring on lower connecting plate; The other end of rigid spring is connected with the lower end of traveller, and the other end of damping spring and the side of traveller closely cooperate.
2. the small accurate non-resonant vibration isolation device based on dry-friction damping according to claim 1, it is characterized in that: described traveller is the polygonal traveller.
3. the small accurate non-resonant vibration isolation device based on dry-friction damping according to claim 1, it is characterized in that: described rigid spring is four.
4. the small accurate non-resonant vibration isolation device based on dry-friction damping according to claim 1 is characterized in that: described shell adopts bolt to be connected with lower connecting plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202393948U CN202203331U (en) | 2011-07-08 | 2011-07-08 | Tiny precise resonance-free vibration isolation device based on dry friction damp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202393948U CN202203331U (en) | 2011-07-08 | 2011-07-08 | Tiny precise resonance-free vibration isolation device based on dry friction damp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202203331U true CN202203331U (en) | 2012-04-25 |
Family
ID=45967453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202393948U Expired - Fee Related CN202203331U (en) | 2011-07-08 | 2011-07-08 | Tiny precise resonance-free vibration isolation device based on dry friction damp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202203331U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392875A (en) * | 2011-07-08 | 2012-03-28 | 南京衡昕龙机电科技有限公司 | Dry friction damping-based micro-precision resonance-free vibration isolator |
| CN102692331A (en) * | 2012-06-07 | 2012-09-26 | 哈尔滨工程大学 | Indirect testing method for equipment to excitation load of hull structure under vertical unbalance excitation force |
-
2011
- 2011-07-08 CN CN2011202393948U patent/CN202203331U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392875A (en) * | 2011-07-08 | 2012-03-28 | 南京衡昕龙机电科技有限公司 | Dry friction damping-based micro-precision resonance-free vibration isolator |
| CN102692331A (en) * | 2012-06-07 | 2012-09-26 | 哈尔滨工程大学 | Indirect testing method for equipment to excitation load of hull structure under vertical unbalance excitation force |
| CN102692331B (en) * | 2012-06-07 | 2014-08-06 | 哈尔滨工程大学 | Indirect testing method for equipment to excitation load of hull structure under vertical unbalance excitation force |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20130708 |