CN203239825U - Viscous fluid damper based on multi-hole throttling - Google Patents
Viscous fluid damper based on multi-hole throttling Download PDFInfo
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- CN203239825U CN203239825U CN 201320281119 CN201320281119U CN203239825U CN 203239825 U CN203239825 U CN 203239825U CN 201320281119 CN201320281119 CN 201320281119 CN 201320281119 U CN201320281119 U CN 201320281119U CN 203239825 U CN203239825 U CN 203239825U
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Abstract
The utility model relates to a viscous fluid damper based on multi-hole throttling. The viscous fluid damper comprises a cylinder body, wherein the two ends of the cylinder body are sealed through sealing pieces, a piston is mounted in a cylinder, the two ends of the piston are provided with two piston rods respectively, viscous fluid is filled in the cylinder body, the piston is provided with one or more axial throttling holes, transparent porous-structure materials are mounted in the throttling holes, a flowing channel formed by the porous structure is curved, and the viscous fluid can flow in or flow out from the porous-structure materials. Speed index adjustment of the damper can be achieved through adjustment of the hole structure, and therefore the constitutive relation of the damper can be greatly enriched, and designable products are made to be various. Meanwhile, large damping force is provided for a frame structure, the displacement and acceleration response of the frame structure is greatly lowered, and anti-shock performance of buildings is improved.
Description
Technical field
The utility model relates to a kind of vibration damping equipment, specifically a kind of Effects of Viscous Fluid Damper based on porous restriction.
Background technique
Effects of Viscous Fluid Damper is a kind of passive passive energy dissipation device, and it mainly comprises cylinder body, is arranged at the piston in the cylinder body, is installed in two piston rods at piston two ends, the seal at cylinder body two ends and the viscous fluids (seeing Fig. 1) that is filled in the cylinder body.The piston of Effects of Viscous Fluid Damper is provided with throttle orifice, and when piston and cylinder body generation relative movement, viscous fluids flows to the other end from piston one end by throttle orifice, and then the viscous damping force of generation and velocity correlation.The throttle orifice of existing viscous damper mainly is clear opening (as shown in Figure 2), namely, along it 1 or penetrating hole is set axially on piston.
Viscous damper mainly is installed in the interlayer of frame structure.When structure earthquake or wind bestir oneself with under during vibration-generating, interlayer can produce relative deformation, thereby can cause between the piston of viscous damper and cylinder body and produce relative movement, propelling fluid flows back and forth in the opinion of throttle orifice, and then produces viscous damping force.
The speed exponent m of damping force only can be regulated by selecting the fluid with different power law index α.Because under the nominal operation state, the power law index of most viscous fluidss that is used for viscous damper is basic identical, is between 0.5 to 0.6.Therefore, be difficult to the Effects of Viscous Fluid Damper of the speed index in other scope of design based on the clear opening structure.This has limited the performance design scope of viscous damper.
The model utility content
Based on above deficiency, the purpose of this utility model is to provide a kind of Effects of Viscous Fluid Damper based on porous restriction, is used for the passive energy dissipation device of bridge and civil structure, and the present invention can realize the design of the viscous damper of low speed index.In close situation, the speed index is lower, and the energy dissipation capacity of damper is also just stronger.
The purpose of this utility model is achieved in that
A kind of Effects of Viscous Fluid Damper based on porous restriction, it comprises cylinder body, the cylinder body two ends seal by seal, piston is arranged in the cylinder body, and the two ends of piston are separately installed with two piston rods, are filled with viscous fluids in the cylinder body, have a plurality of axial throttle orifices that are parallel on the piston, penetrating porous structure material is installed in the throttle orifice, and the formed runner of its porous structure is crooked, viscous fluids can flow into from porous structure material or flow out.
The utility model also has following feature:
1, another is based on the Effects of Viscous Fluid Damper of porous restriction, it comprises cylinder body, the cylinder body two ends seal by seal, piston is installed in the cylinder body, the two ends of piston are separately installed with two piston rods, be filled with viscous fluids in the cylinder body, have one or more large clear openings on the described piston, the solid particle of filling some in the clear opening, the clear opening two ends seal with the end cap that has a plurality of apertures, solid particle can not spill from end cap, changes damping force and speed index thereof by the cross-section area of adjustment clear opening and volume and the loading of solid particle.
2, aforesaid porous structure material is porous ceramics or porous metals bar.
3, aforesaid Effects of Viscous Fluid Damper based on porous restriction, by adjust container and cross-section area with and volume and the loading of the solid particle of filling, thereby change damping force and speed index thereof.
The utility model can be realized the adjusting of damper speed index by the adjusting hole structure.This can greatly enrich the constitutive relation of damper, and so that the product that can design is more extensive.Can provide larger damping to frame structure, reduce significantly displacement and the acceleration response of frame structure, improve the anti-seismic performance of building.
Description of drawings
Fig. 1 is the Effects of Viscous Fluid Damper structural representation;
Fig. 2 is that the throttle orifice of viscous damper is the clear opening schematic representation;
Fig. 3 is that throttle orifice is the streamline chart of fluid in throttle orifice in the porous structure;
Fig. 4 is a kind of piston schematic representation of the Effects of Viscous Fluid Damper based on porous restriction;
Fig. 5 is the schematic representation that is filled with the solid particle of some in the clear opening of piston.
Embodiment
For the ease of engineering design, the damping force of viscous damper generally is expressed as following formula
F＝cV
m (1)
In the formula, F is the damping force of damper, and c is viscosity factor, and m is the speed index, and V is the speed of related movement of piston and cylinder body.
The throttle orifice of existing viscous damper mainly is clear opening (as shown in Figure 2), namely, along it 1 or penetrating hole is set axially on piston.
The constitutive equation that is filled in the liquid of cylinder body is
τ is shearing stress in the formula, and k is viscosity coefficient,
Be shear rate, α is power law index.
The damping force of clear opening viscous damper can be simplified shown as
F＝c(α，k，p)V
m (3)
In the formula, viscosity factor c (α, k, p) is the viscosity coefficient k of fluid, the function of fluid power law index α and clear opening structural parameter (characterizing bore dia, length, quantity and structure etc.) p.Damping force speed exponent m equates with the power law index α of fluid.
Formula (3) shows, comes structural parameter p by selecting viscous fluids with different viscosities coefficient k and power law index α and the structures such as diameter of adjusting hole, can adjust the size of damper damping force viscosity factor c.
As shown in Figure 3, because runner is sinuate, compare with clear opening, the streamline of fluid in throttle orifice will be more complicated.Because the pore throat effect, affected the viscosity property of fluid, therefore the speed index of the damping force that produces has also produced difference with the power law index of fluid.The damping force of such damper can simply be expressed as.
F＝c(m，k)V
m(α，p)
In the formula, viscosity factor c (α, k, p) is the viscosity coefficient k of fluid, the function of fluid power law index α and clear opening structural parameter (characterizing bore dia, length, quantity and structure etc.) p.Damping force speed exponent m no longer equals the power law index α of fluid, but the function of power law index α and clear opening structural parameter p, in the fixing situation of α, by adjusting the clear opening structural parameter p index of also can regulating the speed.That is to say the quantity by adjusting aperture and the shape index of just can regulating the speed.Because the pore throat effect, affected the viscosity property of fluid, therefore the speed index of the damping force that produces has also produced difference with the power law index of fluid.
A kind of Effects of Viscous Fluid Damper based on porous restriction, it comprises cylinder body, the cylinder body two ends seal by seal, piston is installed in the cylinder body, and the two ends of piston are separately installed with two piston rods, are filled with viscous fluids in the cylinder body, have one or more axial throttle orifices that are parallel on the piston, penetrating porous structure material is installed in the throttle orifice, and the formed runner of its porous structure is crooked, viscous fluids can flow into from porous structure material or flow out.Described porous structure material is porous ceramics or porous metals bar.As shown in Figure 3, throttle orifice of the present invention is porous structure, the flow channel of fluid and non-rectilinear but sinuate broken line.
Shown in Fig. 4-5, a kind of Effects of Viscous Fluid Damper based on porous restriction, it comprises cylinder body, the cylinder body two ends seal by seal, piston is installed in the cylinder body, the two ends of piston are separately installed with two piston rods, be filled with viscous fluids in the cylinder body, have one or more large clear openings on the described piston, then in clear opening, load the solid particle of some, the clear opening two ends seal with the end cap that has a plurality of apertures, and solid particle can not spill from end cap, change damping force and speed index thereof by the cross-section area of adjustment clear opening and volume and the loading of solid particle.
For this structure, if select viscosity coefficient 130Ns/m
2Silicone oil be viscous fluids, formula of reduction calculates and to show that the speed index of damper is as shown in the table.This table shows, by adjusting the diameter of ball bed diameter and loaded particles, can realize the significant adjusting of speed index.The porous structure that forms for alternate manner also has similar effect.
Table 1 porous viscous damper structural parameter and speed index
Annotate: ball bed diameter refers to the diameter at the macropore of the default filler particles of piston.
In case the operating speed of damper surpasses after its prediction top speed, the amplitude that its damping force increases reduces with the reduction of speed index.In case such benefit is damper has in use surpassed top speed (having run into larger earthquake such as structure), it is little that at this moment damper offers the increasing degree of force rate expection of structure.Can not cause because damping force is excessive like this destruction of the main structure body that links to each other with damper.Be conducive to structural safety.
Claims (4)
1. Effects of Viscous Fluid Damper based on porous restriction, it comprises cylinder body, the cylinder body two ends seal by seal, piston is arranged in the cylinder body, and the two ends of piston are separately installed with two piston rods, are filled with viscous fluids in the cylinder body, it is characterized in that: have one or more axial throttle orifices that are parallel on the piston, penetrating porous structure material is installed in the throttle orifice, and the formed runner of its porous structure is crooked, viscous fluids can flow into from porous structure material or flow out.
2. described a kind of Effects of Viscous Fluid Damper based on porous restriction according to claim 1, it is characterized in that: on the described piston or have one or more large clear openings, the solid particle of filling some in the clear opening, the clear opening two ends seal with the end cap that has a plurality of apertures, and solid particle can not spill from end cap.
3. a kind of Effects of Viscous Fluid Damper based on porous restriction according to claim 1, it is characterized in that: described porous structure material is porous ceramics or porous metals bar.
4. a kind of Effects of Viscous Fluid Damper based on porous restriction according to claim 2 is characterized in that: by adjust container and cross-section area with and volume and the loading of the solid particle of filling, thereby change damping force and speed index thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320281119 CN203239825U (en) | 2013-05-16 | 2013-05-16 | Viscous fluid damper based on multi-hole throttling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320281119 CN203239825U (en) | 2013-05-16 | 2013-05-16 | Viscous fluid damper based on multi-hole throttling |
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| CN203239825U true CN203239825U (en) | 2013-10-16 |
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| CN 201320281119 Withdrawn - After Issue CN203239825U (en) | 2013-05-16 | 2013-05-16 | Viscous fluid damper based on multi-hole throttling |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244598A (en) * | 2013-05-16 | 2013-08-14 | 哈尔滨工业大学 | Viscous fluid damper based on porous throttling |
| CN106801379A (en) * | 2017-01-22 | 2017-06-06 | 北京工业大学 | A kind of speed locking device |
| CN107687492A (en) * | 2016-12-14 | 2018-02-13 | 北京久硕新材科技发展有限公司 | Shock absorber for vehicle of micro- porous metal fiber felt as damping element |
| CN108468745A (en) * | 2018-03-22 | 2018-08-31 | 扬州大学 | A kind of damper piston valve arrangement |
-
2013
- 2013-05-16 CN CN 201320281119 patent/CN203239825U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103244598A (en) * | 2013-05-16 | 2013-08-14 | 哈尔滨工业大学 | Viscous fluid damper based on porous throttling |
| CN103244598B (en) * | 2013-05-16 | 2015-04-01 | 哈尔滨工业大学 | Viscous fluid damper based on porous throttling |
| CN107687492A (en) * | 2016-12-14 | 2018-02-13 | 北京久硕新材科技发展有限公司 | Shock absorber for vehicle of micro- porous metal fiber felt as damping element |
| CN106801379A (en) * | 2017-01-22 | 2017-06-06 | 北京工业大学 | A kind of speed locking device |
| CN108468745A (en) * | 2018-03-22 | 2018-08-31 | 扬州大学 | A kind of damper piston valve arrangement |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131016 Effective date of abandoning: 20150401 |
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| RGAV | Abandon patent right to avoid regrant |