CN211735790U - Damping-adjustable friction pendulum support - Google Patents
Damping-adjustable friction pendulum support Download PDFInfo
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- CN211735790U CN211735790U CN201922405256.1U CN201922405256U CN211735790U CN 211735790 U CN211735790 U CN 211735790U CN 201922405256 U CN201922405256 U CN 201922405256U CN 211735790 U CN211735790 U CN 211735790U
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- damping
- metal foam
- pendulum support
- friction pendulum
- magnetorheological fluid
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Abstract
The utility model belongs to the technical field of structural vibration isolation, and discloses a damping adjustable friction pendulum support which adopts a lower sliding surface working mode and comprises a sliding block and a sliding panel which form a spherical friction pair, wherein the sliding panel is provided with a sliding surface; a coil is embedded in the sliding block; the sliding panel is provided with symmetrically arranged metal foam matrixes, and the top surfaces of the metal foam matrixes are lower than the top surface of the sliding surface, so that damping gaps are formed between the metal foam matrixes and the sliding blocks; the magnetorheological fluid is soaked in the metal foam matrix. When the magnetorheological fluid is not in the magnetic field region formed by the coil, the magnetorheological fluid is stored in the metal foam; when the magnetorheological fluid is in the magnetic field area, the magnetorheological fluid is filled into the damping gap under the action of the magnetic field force. The utility model combines the semi-active control technology of the rheological fluid, and realizes the function of adjustable damping on the premise of keeping the original working mode of a part of friction pendulum support; meanwhile, the sealing of the magnetorheological fluid is ingeniously ensured by utilizing the characteristics of the metal foam.
Description
Technical Field
The utility model belongs to the technical field of the structure vibration isolation, specific theory relates to a friction pendulum support.
Background
The friction pendulum support is an effective dry friction shock isolation device, is mostly arranged between an upper structure and a foundation, can reduce the horizontal vibration transmitted to the structure by earthquake load, and avoids the earthquake damage of the structure. The mount is typically comprised of a sliding panel, a rotating panel and an intermediate slide. A spherical friction pair is formed between the sliding panel and the sliding block, so that the sliding block can do reciprocating motion similar to a pendulum on the sliding surface, and relative friction is generated to dissipate seismic energy. In order to adapt to the working mode of the sliding panel and the sliding block, a spherical friction pair is formed between the rotating panel and the sliding block, and the main function of the spherical friction pair is to prevent the support from overturning by rotating and adjusting the position. The friction pendulum support has the characteristics of self-limiting, self-resetting and stable vibration due to the unique structure.
The working mode of the friction pendulum support is as follows: when the earthquake acting force exceeds the static friction force, the horizontal movement of the ground can cause the sliding block to horizontally slide in the arc surface, the upper structure is slightly lifted, and then the sliding block can restore to the original position under the action of the gravity of the sliding block to the bottommost part of the arc movable surface. The seismic energy is dissipated by such reciprocating movement of the slider and the mutual friction between the slider and the sliding surface.
However, the friction pendulum support still has engineering application limitation, because the friction coefficient and the curvature radius of the friction pendulum support are constant values, the damping is not changed, the friction pendulum support cannot adapt to seismic input with different strengths, and the seismic isolation effect is influenced. If rare meets earthquake, because the damping is a fixed value, in order to dissipate overlarge earthquake energy, the friction pendulum support can increase the horizontal slippage, even exceed the designed effective sliding displacement of the support, so that the support is damaged. Once the friction support serving as an important node in the structure fails, a force transmission path of the structure is changed, so that the anti-seismic performance of other parts is adversely affected, and the earthquake damage of the structure is further aggravated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that the existing friction pendulum support can not adapt to earthquake input with different intensities, and provides a damping-adjustable friction pendulum support, which is based on a lower sliding surface friction pendulum support and combines with a semi-active control technology of rheological fluid to realize the damping-adjustable function on the premise of keeping the original working mode of part of the friction pendulum support; meanwhile, the sealing of the magnetorheological fluid is ingeniously ensured by utilizing the characteristics of the metal foam.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
a damping adjustable friction pendulum support adopts a lower sliding surface working mode and comprises a sliding block and a sliding panel which form a spherical friction pair, wherein the sliding panel is provided with a sliding surface; a coil is embedded in the sliding block and moves along with the sliding block, and a magnetic field generated by the coil is distributed around the sliding block;
the sliding panel is provided with metal foam substrates which are symmetrically arranged on two sides of the swinging central plane of the sliding block; the top surface of the metal foam base body is lower than the top surface of the sliding surface, so that a damping gap is formed between the metal foam base body and the sliding block;
magnetorheological fluid is soaked inside the metal foam matrix; with the oscillation of the sliding block, when the magnetorheological fluid is not in the magnetic field region formed by the coil, the magnetorheological fluid is stored in the metal foam; when the magneto-rheological fluid is in the magnetic field region, the magneto-rheological fluid is filled into the damping gap under the action of the magnetic field force.
Further, the length of the coil covers at least the extent of the metal foam matrix.
Further, the ratio of the laying area of the metal foam base body to the area of the sliding surface is (1-2): 1.
Further, the height of damping clearance is 1 ~ 2 mm.
Further, the current in the coil is increased by changing the current regulation magnetic field in the coil, and the damping of the magnetorheological fluid is increased to increase the damping of the friction pendulum support; and reducing the current in the coil, and reducing the damping of the magnetorheological fluid to reduce the damping of the friction pendulum support.
Further, the cover plate is made of a magnetic isolation material.
Further, the slider is made of a magnetic conductive material.
Furthermore, the damping-adjustable friction pendulum support also comprises a rotating panel, and the rotating panel is made of a magnetism isolating material.
The utility model has the advantages that:
the utility model provides a damping adjustable friction pendulum support, which realizes the function of variable damping by using the semi-active control technology of magnetorheological fluid; the defect that the traditional friction pendulum support cannot adapt to earthquake input with different strengths because the damping is unchanged due to constant friction coefficient and curvature radius is overcome; meanwhile, the problem that the traditional friction pendulum support is likely to lose efficacy due to overlarge horizontal displacement when a rare earthquake occurs, so that the earthquake damage of the upper structure is aggravated is solved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of an adjustable damping friction pendulum support;
FIG. 2 is a schematic sectional view of an embodiment of an adjustable damping friction pendulum support;
FIG. 3 is a schematic diagram of a cross-sectional view taken along the line a-a of an embodiment of an adjustable damping friction pendulum support;
FIG. 4 is a schematic structural view of a section b-b of an embodiment of an adjustable damping friction pendulum support;
fig. 5 is a schematic structural view of a c-c cross section of an embodiment of an adjustable damping friction pendulum support.
In the above figures: 1. a cover plate; 2. a slider; 3. a sliding surface; 4. a metal foam substrate; 5. magnetorheological fluid; 6. a damping gap; 7. a coil; 8. a base.
Detailed Description
The utility model provides a damping adjustable friction pendulum support, which utilizes the characteristic that magnetorheological fluid can be converted from Newtonian fluid into viscous plastic with higher shear yield stress under the action of a magnetic field to realize the aim of controllable damping; the original working mode of a part of friction pendulum support is kept, namely the sliding block does reciprocating motion similar to a pendulum on the sliding surface, and energy is dissipated by means of mutual friction of the sliding block and the pendulum; meanwhile, the sealing problem of the magnetorheological fluid is solved by combining the characteristics of high porosity, light weight, high strength and electric conductivity of the metal foam.
For further understanding of the contents, features and effects of the present invention, the following embodiments will be exemplified in conjunction with the accompanying drawings as follows:
referring to fig. 1-5, the present embodiment provides an adjustable damping friction pendulum support, which includes a friction pendulum support original structure portion and an adjustable damping portion. The original structure part of the friction pendulum support sequentially comprises a cover plate 1, a sliding block 2 and a base 8 from top to bottom, and a sliding surface 3 is machined on the upper surface of the base 8. The base 8 is used as a sliding panel to form a spherical friction pair with the sliding block 2, and is used for generating relative friction to dissipate seismic energy. The cover plate 1 is used as a rotating panel and forms a spherical friction pair with the sliding block 2, so that the support is kept stable and overturning is avoided. The damping adjustable part comprises a coil 7, magnetorheological fluid 5 and a metal foam matrix 4. This embodiment is based on a unidirectional motion, single glide plane and adopts the friction pendulum support of lower glide plane mode, to the friction pendulum support of the different specifications and the form of multidirectional motion, a plurality of glide planes, as long as adopt lower glide plane working method, all be in the utility model discloses in the protection range.
Two mounting groove positions are arranged on the base 8, a metal foam base body 4 is placed in each mounting groove position, and the metal foam base bodies 4 are fixedly bonded with the base 8. The two metal foam substrates 4 are symmetrically arranged on two sides by taking the swing central plane of the sliding block (also the central plane of the base 8 in the embodiment) as a symmetrical plane, and the laying area of the two metal foam substrates 4 accounts for 1/2-2/3 of the original sliding surface area of the base 8, namely, the 1/2-2/3 area of the original sliding surface is replaced by metal foam materials. Thus, a part of the original working mode of the friction pendulum support can be reserved by reserving part of the sliding surface 3, namely, in the area of the existing sliding surface 3, the sliding block 2 still performs reciprocating motion similar to a pendulum on the sliding surface 3, and energy is dissipated by means of mutual friction of the sliding surface 3 and the sliding block; and the sliding surface 3 also has the function of bearing the weight of the sliding block, so that the sliding block 2 is prevented from directly contacting the metal foam base body 4 to cause the damage of the metal foam. The magnetorheological fluid 5 is filled in the metal foam substrate 4, and the magnetorheological fluid 5 is soaked in the mutually communicated pores in the metal foam substrate 4. The magnetorheological fluid is an intelligent driving material, a suspension liquid formed by dispersing ferromagnetic particles in nonmagnetic liquid can be rapidly converted into a viscous magnetic hysteresis plastic body with higher shear yield stress by Newtonian fluid in a very short time, and the rheological property of the viscous magnetic hysteresis plastic body is obviously changed along with the size and the frequency of an external magnetic field.
A coil 7 is embedded in the slide block 2; the length of the coil 7 in the width direction of the base 8 should cover the extent of the metal foam body 4. A hole channel is reserved in the sliding block 2, and a movable cover plate is installed at one end of the hole channel, so that the coil 7 is installed and disassembled. The coil 7 moves along with the slider 2, so that a magnetic field is distributed around the slider 2, and the magnetorheological fluid 5 is also positioned in the area of the slider 2 to generate a magnetorheological effect, thereby changing the damping area; therefore, the energy consumption of the coil 7 can be reduced, a magnetic field is only provided for the magnetorheological material in the working area, and the function of adjustable damping is not influenced.
The top surface of the metal foam base 4 is about 2mm lower than the top surface of the sliding surface 3, so that a damping gap 6 is formed between the metal foam base 4 and the sliding block 2, and the optimal height of the damping gap 6 is 1-2 mm. Because the damping gap 6 is communicated with the pores of the metal foam substrate 4, when the magnetorheological fluid 5 is not in the magnetic field region formed by the coil 7, the magnetorheological fluid 5 is stored in the metal foam substrate 4; when the magnetorheological fluid 5 is in the magnetic field region, the magnetorheological fluid 5 is filled in the damping gap 6 due to the action of the magnetic field force. Ferromagnetic particles of the magnetorheological fluid 5 in the damping gap 6 are arranged in a chain shape along the direction of the magnetic field and are vertical to the bottom of the sliding block 2 to generate a magnetorheological effect. When the base 8 moves horizontally relative to the sliding block 2 and the cover plate 1 under the action of an earthquake, the bottom surface of the sliding block 2 and the top surface of the metal foam base body 4 move relatively, and the magnetorheological fluid 5 is in a shearing working mode.
The magnetic field is modulated by varying the current level in the coil 7: increasing the current in the coil 7, gradually converting the magnetorheological fluid 5 from Newtonian fluid into a viscous plastic body with higher shear yield stress, and showing that the damping of the material is increased, so that the damping of the friction pendulum support is increased; the current in the coil 7 is reduced, the magnetorheological fluid 5 is gradually changed into a Newtonian body from a viscous plastic body, the material damping is reduced, and the damping of the friction pendulum support is further reduced. As the state of the magnetorheological fluid 5 is continuously adjustable, the damping of the friction pendulum support is also continuously adjustable.
The processing material of apron 1 is magnetic isolation material, can select to use the aluminum alloy, and its magnetic conductivity is low, can effectively block the passing through of magnetic induction line for the magnetic field only encircles slider 2 and distributes, improves the utilization efficiency in magnetic field. The slider 2 is made of a magnetic conductive material, and electrician pure iron with high magnetic conductivity and high magnetic saturation is selected for the slider 2 with high magnetic conductivity and good demagnetization performance, so that a closed magnetic circuit can be formed between the metal foam substrate 4 and the slider 2. The base 8 is made of low carbon steel, and has the advantages of good structure and machining performance.
Therefore, the damping adjustable friction pendulum support disclosed by the utility model has the advantages of compact structure and variable damping, and can overcome the defect that the traditional friction pendulum support cannot adapt to earthquake input with different intensities because the damping is constant due to constant friction coefficient and curvature radius; meanwhile, the problem that the traditional friction pendulum support is likely to lose efficacy due to overlarge horizontal displacement when a rare earthquake occurs, so that the earthquake damage of the upper structure is aggravated is solved.
Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can make various changes without departing from the spirit and the scope of the invention as claimed.
Claims (8)
1. A damping adjustable friction pendulum support adopts a lower sliding surface working mode and comprises a sliding block and a sliding panel which form a spherical friction pair, wherein the sliding panel is provided with a sliding surface; the magnetic field generator is characterized in that a coil is embedded in the sliding block and moves along with the sliding block, and a magnetic field generated by the coil is distributed around the sliding block;
the sliding panel is provided with metal foam substrates which are symmetrically arranged on two sides of the swinging central plane of the sliding block; the top surface of the metal foam base body is lower than the top surface of the sliding surface, so that a damping gap is formed between the metal foam base body and the sliding block;
magnetorheological fluid is soaked inside the metal foam matrix; with the oscillation of the sliding block, when the magnetorheological fluid is not in the magnetic field region formed by the coil, the magnetorheological fluid is stored in the metal foam; when the magneto-rheological fluid is in the magnetic field region, the magneto-rheological fluid is filled into the damping gap under the action of the magnetic field force.
2. The adjustable damping friction pendulum support of claim 1 wherein the length of the coil covers at least the extent of the metal foam substrate.
3. The damping-adjustable friction pendulum support according to claim 1, wherein the ratio of the surface area of the metal foam substrate to the surface area of the sliding surface is (1-2): 1.
4. The adjustable damping friction pendulum support according to claim 1, wherein the height of the damping gap is 1-2 mm.
5. The adjustable damping friction pendulum support according to claim 1, wherein the current in the coil is increased by changing the current regulating magnetic field in the coil, and the damping of the magnetorheological fluid is increased to increase the damping of the friction pendulum support; and reducing the current in the coil, and reducing the damping of the magnetorheological fluid to reduce the damping of the friction pendulum support.
6. The adjustable damping friction pendulum support of claim 1 wherein the cover plate is made of a magnetic isolation material.
7. The adjustable damping friction pendulum support of claim 1 wherein the slider is made of a magnetically conductive material.
8. The adjustable damping friction pendulum support of claim 1 further comprising a rotating face plate, wherein the rotating face plate is made of a magnetic isolation material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922405256.1U CN211735790U (en) | 2019-12-27 | 2019-12-27 | Damping-adjustable friction pendulum support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922405256.1U CN211735790U (en) | 2019-12-27 | 2019-12-27 | Damping-adjustable friction pendulum support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211735790U true CN211735790U (en) | 2020-10-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922405256.1U Expired - Fee Related CN211735790U (en) | 2019-12-27 | 2019-12-27 | Damping-adjustable friction pendulum support |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211735790U (en) |
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2019
- 2019-12-27 CN CN201922405256.1U patent/CN211735790U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201023 Termination date: 20211227 |
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| CF01 | Termination of patent right due to non-payment of annual fee |