CN209907646U - Negative-stiffness damping device - Google Patents
Negative-stiffness damping device Download PDFInfo
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- CN209907646U CN209907646U CN201920688970.3U CN201920688970U CN209907646U CN 209907646 U CN209907646 U CN 209907646U CN 201920688970 U CN201920688970 U CN 201920688970U CN 209907646 U CN209907646 U CN 209907646U
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Abstract
The utility model relates to a negative stiffness damping shock absorption device, which comprises a fixed shell, wherein the fixed shell comprises a horizontal top plate and side end plates with two vertical ends, and the side end plates are fixed at two ends of the top plate; the outside of the side end plate is fixedly connected with a side plate, the fixed shell and a box body enclosed by the two side plates are provided with fisheye bearing end rods for fixed connection, the center of an internal top plate of the fixed shell is provided with a plurality of vertical friction rails, the friction rails are uniformly distributed on the central line of the top plate, and the central line is parallel to the side end plate; two sides of each friction track are respectively and symmetrically provided with a friction assembly; friction subassembly one end and friction track sliding connection to still be connected flange fixed connection with the base, friction subassembly's the other end and side end plate are articulated. The utility model discloses it is little to have also to provide very big pressure and installation space under the less circumstances of compressive capacity, and it is stable balanced to exert oneself, and the burden rigidity damping device size of preparation is little, and the damping force is big, and burden rigidity characteristic is obvious.
Description
Technical Field
The utility model relates to a burden rigidity damping device can be applied to engineering structure damping control, belongs to vibration control technical field.
Background
China is a country with frequent earthquakes, collapse of building structures in disasters such as great earthquake in Tang mountain, Wenchand earthquake and the like is a main reason for casualty property loss, along with rapid development of economy in China, the earthquake-resistant requirement of buildings is improved, and anti-buckling supports, viscoelastic dampers, mild steel dampers, friction dampers and the like are mostly adopted in the traditional vibration-damping structures for vibration-damping control. However, in some cases, the conventional dampers apply a large additional stiffness to the structure, and the increase in stiffness causes more seismic energy to be transmitted to the upper layer of the structure, so that the possibility of the structure being damaged due to the increase in the interlayer shear of the structure is increased, the damping effect cannot be expected, and the seismic performance is not ideal.
SUMMERY OF THE UTILITY MODEL
Based on the problem that a larger additional rigidity is applied to the structure in the structural vibration reduction, the negative-rigidity damping vibration-absorbing device for reducing the structural rigidity is provided. The utility model discloses a realization method does: based on traditional friction damper, realize the production of negative stiffness damping force through the size that changes pressure, negative stiffness damping device's pressure is applyed through the articulated nitrogen gas spring in both ends, and both ends connecting piece have been acted as negative stiffness component to nitrogen gas spring and both ends, and friction type attenuator embodies the quasi-zero rigidity characteristics, and according to the parallelly connected principle of rigidity, negative stiffness damping device presents the negative stiffness characteristic. The middle of the connecting piece is provided with a round hole which can drive the negative stiffness element to rotate through the reciprocating motion of the friction damper.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the negative stiffness damping shock absorption device comprises a fixed shell, wherein the fixed shell comprises a horizontal top plate and side end plates with two vertical ends, and the side end plates are fixed at two ends of the top plate; the outside of the side end plate is fixedly connected with a side plate, the fixed shell and the box body enclosed by the two side plates are provided with fisheye bearing end rods for fixed connection, the center of the top plate in the fixed shell is provided with a plurality of vertical friction rails, the friction rails are uniformly distributed on the central line of the top plate, and the central line is parallel to the side end plate;
two sides of each friction track are respectively and symmetrically provided with a friction assembly; friction subassembly one end and friction track sliding connection to still be connected flange fixed connection with the base, friction subassembly's the other end and side end plate are articulated.
Preferably, there are two friction tracks, one friction track for each two friction assemblies, for a total of four friction assemblies.
Furthermore, each friction assembly comprises a first double-lug connecting plate, a second double-lug connecting plate, a nitrogen spring, a single-lug connecting plate and a sliding pull plate; the compression end of the nitrogen spring is connected with a single-lug connecting plate, and the single-lug connecting plate is hinged with a second double-lug connecting plate; the second double-lug connecting plate is fixed on the sliding pulling plate; the upper end of the sliding pull plate is connected with the friction track in a sliding manner, and the sliding pull plate slides up and down along the friction track; the lower end of each sliding pull plate is connected with a pull plate connecting plate through a pin shaft, and the pull plate connecting plate is fixedly connected with a base connecting flange; the nitrogen spring cylinder body is fixedly connected with a first double-lug connecting plate, and the first double-lug connecting plate is hinged on the inner wall of the side end plate.
The friction assembly composed of the nitrogen spring is symmetrically arranged by taking the friction track as an axis, so that the damper is prevented from deflecting during repeated reciprocating motion.
The sliding pulling plate is provided with a guide groove in the sliding direction. The groove arranged on the sliding pulling plate and the left side and the right side of the friction track can slide freely without being locked.
A gap is reserved between the lower ends of the pair of sliding pull plates on each friction track, the pull plate connecting plates are installed in the gaps, and the width of the gap is larger than the thickness of the pull plate connecting plates. After the sliding pull plates are arranged on the friction track, the sliding pull plates do not need to be contacted with each other. The pulling plate connecting plate is placed in the gap and connected through the pin shaft to drive the sliding assembly to reciprocate. The gap between the two sliding pull plates is enough for installing the pull plate connecting plate, and a certain gap is left after installation. The components connected by the pin shaft need to be able to rotate freely about the pin shaft.
Further, the maximum amount of compression of the nitrogen spring is less than ninety percent of the product specification.
When the damper is installed on the structure, the fish eyes at the upper end are hinged, and the lower end is connected with the flange plate through the flange plate. The damping force is the vector sum of the friction force and the elastic force of the nitrogen spring, the nitrogen spring is in the state of maximum compression amount and vertically extrudes the sliding pulling plate in the initial state, a certain included angle is generated between the nitrogen spring and the sliding pulling plate after the damper enters the working stage, the component of the nitrogen spring parallel to the sliding pulling plate always enables the damper to be far away from the balance position, the component of the nitrogen spring perpendicular to the sliding pulling plate provides positive pressure for generating the friction force, the larger the damper deviates from the balance position, the smaller the positive pressure for generating the friction force is, and therefore the damping force is represented as negative rigidity.
The utility model discloses the coefficient of friction of accessible change friction surface, burden rigidity component length, nitrogen spring parameter, nitrogen spring quantity adjustment burden rigidity damping device's damping force and burden rigidity size. The damping device with the negative stiffness can improve the damping while reducing the structural stiffness, essentially prolongs the yield stage of the structure, reduces the natural frequency of the structure, prolongs the structure period, and increases the damping ratio, thereby improving the energy consumption capability of the structure and having very wide application prospect.
The negative stiffness damping device has the following advantages:
(1) the nitrogen spring is used for manufacturing the negative stiffness element, so that the nitrogen spring can provide large pressure under the condition of small compression amount, the installation space is small, the output force is stable and balanced, and the manufactured negative stiffness damping device is small in size, large in damping force and obvious in negative stiffness characteristic.
(2) The mechanical characteristics of the negative stiffness damping shock absorption device can be adjusted according to the parameters of the nitrogen spring, the length of the negative stiffness element, the friction coefficient, the stroke of the damper and the number of the negative stiffness elements.
Drawings
FIG. 1 is a structural diagram of the present invention;
fig. 2 is a front view of the present invention;
FIG. 3 is a schematic structural view of the nitrogen spring of the present invention;
FIG. 4 is a structural diagram of the single-lug connecting plate of the present invention;
FIG. 5 is a structural diagram of the double-lug connecting plate of the present invention;
FIG. 6 is a structural diagram of the fixing housing of the present invention;
FIG. 7 is a structural view of the slide plate of the present invention;
FIG. 8 is a structural view of the tie plate connection plate of the present invention;
fig. 9 is a hysteresis curve of the damper of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 1 and 2, the negative stiffness damping and shock absorbing device comprises a fixed shell 2, as shown in fig. 6, the fixed shell 2 comprises a horizontal top plate and side end plates 13 with two vertical ends, and the side end plates 13 are fixed at two ends of the top plate; the side end plate 13 is externally and fixedly connected with a side plate 9, the fixed shell 2 and the two side plates 9 form a box body in a surrounding manner, a fisheye bearing end rod 1 is arranged outside the box body and is used for fixed connection, two vertical friction rails 12 are arranged at the center of an inner top plate of the fixed shell 2, the two friction rails 12 are uniformly distributed on the central line of the top plate, and the central line is parallel to the side end plate 13;
two sides of each friction track 12 are respectively and symmetrically provided with a friction component; one end of the friction component is connected with the friction track 12 in a sliding mode and is fixedly connected with the base connecting flange 8, and the other end of the friction component is hinged with the side end plate 13. Each two friction assemblies share a friction track 12 for a total of four friction assemblies.
Each friction assembly comprises a first double-lug connecting plate 3, a second double-lug connecting plate 11, a nitrogen spring 4, a single-lug connecting plate 5 and a sliding pull plate 6; the compression end of the nitrogen spring 4 is connected with a single lug connecting plate 5, and the single lug connecting plate 5 is hinged with a second double lug connecting plate 11; the second double-lug connecting plate 11 is fixed on the sliding pulling plate 6; the upper end of the sliding pulling plate 6 is connected with the friction track 12 in a sliding way, and the sliding pulling plate 6 slides up and down along the friction track 12; the lower end of each sliding pull plate 6 is connected with a pull plate connecting plate 7 through a pin shaft 10, and the pull plate connecting plates 7 are fixedly connected with a base connecting flange 8. The component views are shown in fig. 7 and 8.
As shown in figure 3, the nitrogen spring 4 cylinder is fixedly connected with a first double-lug connecting plate 3, and the first double-lug connecting plate 3 is hinged on the inner wall of the side end plate 13.
The sliding pulling plate 6 is provided with a guide groove in the sliding direction.
A gap is reserved between the lower ends of the pair of sliding pull plates 6 on each friction track 12, the pull plate connecting plates 7 are installed in the gaps, and the width of the gap is larger than the thickness of the pull plate connecting plates 7.
After the sliding pulling plates 6 are placed in the friction tracks 12, the sliding pulling plates 6 are not contacted with each other.
In addition, as shown in fig. 4 and 5, in order to prevent the possibility of damage to the nitrogen spring when the damper is operated, a countersunk treatment is performed. Countersunk holes or screws with thin nuts are selected to prevent the damper from colliding with the nuts to influence the normal work of the damper when the damper drives the friction component to rotate when reciprocating.
The friction coefficient between the sliding pulling plate 6 and the friction track is adjusted, and the damping force and the negative stiffness generated by the damper can be adjusted by replacing the nitrogen spring 4 with different parameters. The size of damping force can be adjusted in the adjustment friction subassembly quantity.
The damping force of the negative stiffness damping shock absorption device is the vector sum of the friction force and the elastic force of the nitrogen spring, in an initial state, the nitrogen spring 4 is in a maximum compression amount state and vertically extrudes the sliding pull plate 6, after the damper enters a working stage, a certain included angle can be generated between the nitrogen spring 4 and the sliding pull plate 6, the component of the nitrogen spring 4 parallel to the sliding pull plate 6 always enables the damper to be far away from a balance position, the component of the nitrogen spring 4 perpendicular to the sliding pull plate 6 provides positive pressure for generating the friction force, the larger the damper deviates from the balance position, the smaller the positive pressure for generating the friction force is, and therefore the damping force of the damper is represented as negative stiffness. The hysteresis curve generated by the embodiment is shown in fig. 9, the distance between the holes at the two ends of the adopted negative stiffness element is 95mm, the friction coefficient between the sliding pulling plate 6 and the friction track 12 is about 0.1, the nitrogen spring mechanics parameter is 1650N, the total number is 4, the damper stroke is +/-30 mm, the damper is loaded by sine wave 0.05HZ and is loaded circularly for 10 times, and it can be seen from fig. 9 that the damper shows obvious negative stiffness in the loading process, the hysteresis curve is stable, and the negative stiffness value is about-65N/mm. In addition, when the number of negative stiffness elements is increased, the damping force is also increased; the maximum damping force increases as the coefficient of friction increases; the negative stiffness created when the nitrogen spring 4 pressure increases will increase.
The above is a typical embodiment of the present invention, and the implementation of the present invention is not limited thereto.
Claims (4)
1. Negative stiffness damping device, its characterized in that: the device comprises a fixed shell (2), wherein the fixed shell (2) comprises a horizontal top plate and side end plates (13) with two vertical ends, and the side end plates (13) are fixed at two ends of the top plate; the side end plate (13) is externally and fixedly connected with a side plate (9), the fixed shell (2) and the two side plates (9) form a box body in a surrounding mode, a fisheye bearing end rod (1) is arranged outside the box body and used for being fixedly connected, a plurality of vertical friction rails (12) are arranged at the center of an inner top plate of the fixed shell (2), the friction rails (12) are uniformly distributed on the central line of the top plate, and the central line is parallel to the side end plate (13);
two sides of each friction track (12) are respectively and symmetrically provided with a friction component; one end of the friction component is connected with the friction track (12) in a sliding mode and is fixedly connected with the base connecting flange plate (8), and the other end of the friction component is hinged with the side end plate (13).
2. The negative stiffness damping shock device according to claim 1, wherein: each friction assembly comprises a first double-lug connecting plate (3), a second double-lug connecting plate (11), a nitrogen spring (4), a single-lug connecting plate (5) and a sliding pull plate (6); the compression end of the nitrogen spring (4) is connected with a single-lug connecting plate (5), and the single-lug connecting plate (5) is hinged with a second double-lug connecting plate (11); the second double-lug connecting plate (11) is fixed on the sliding pulling plate (6); the upper end of the sliding pulling plate (6) is connected with the friction track (12) in a sliding way, and the sliding pulling plate (6) slides up and down along the friction track (12); the lower end of each sliding pull plate (6) is connected with a pull plate connecting plate (7) through a pin shaft (10), and the pull plate connecting plate (7) is fixedly connected with a base connecting flange plate (8);
the nitrogen spring (4) cylinder body is fixedly connected with a first double-lug connecting plate (3), and the first double-lug connecting plate (3) is hinged on the inner wall of the side end plate (13).
3. The negative stiffness damping shock device according to claim 2, wherein: the sliding pulling plate (6) is provided with a guide groove in the sliding direction.
4. The negative stiffness damping shock device according to claim 2, wherein: a gap is reserved between the lower ends of the pair of sliding pull plates (6) on each friction track (12), the pull plate connecting plates (7) are installed in the gaps, and the width of the gap is larger than the thickness of the pull plate connecting plates (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920688970.3U CN209907646U (en) | 2019-05-15 | 2019-05-15 | Negative-stiffness damping device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920688970.3U CN209907646U (en) | 2019-05-15 | 2019-05-15 | Negative-stiffness damping device |
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| CN209907646U true CN209907646U (en) | 2020-01-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145044A (en) * | 2019-05-15 | 2019-08-20 | 北京工业大学 | Negative stiffness damping device |
| CN113293879A (en) * | 2021-06-28 | 2021-08-24 | 华中科技大学 | Passive damping device capable of realizing self-adaptive control characteristic of complex damping |
| CN114960402A (en) * | 2022-05-26 | 2022-08-30 | 同济大学 | Adjustable-rigidity high-damping rubber vibration damping device for pull sling and installation method of adjustable-rigidity high-damping rubber vibration damping device |
-
2019
- 2019-05-15 CN CN201920688970.3U patent/CN209907646U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145044A (en) * | 2019-05-15 | 2019-08-20 | 北京工业大学 | Negative stiffness damping device |
| CN113293879A (en) * | 2021-06-28 | 2021-08-24 | 华中科技大学 | Passive damping device capable of realizing self-adaptive control characteristic of complex damping |
| CN114960402A (en) * | 2022-05-26 | 2022-08-30 | 同济大学 | Adjustable-rigidity high-damping rubber vibration damping device for pull sling and installation method of adjustable-rigidity high-damping rubber vibration damping device |
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