CN112411782B - Balance weight lever type negative stiffness friction damper - Google Patents
Balance weight lever type negative stiffness friction damper Download PDFInfo
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- CN112411782B CN112411782B CN202011131294.3A CN202011131294A CN112411782B CN 112411782 B CN112411782 B CN 112411782B CN 202011131294 A CN202011131294 A CN 202011131294A CN 112411782 B CN112411782 B CN 112411782B
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- lever
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
Abstract
The invention relates to a counterweight lever type negative stiffness friction damper, and belongs to the technical field of vibration control. The device comprises a top steel plate, a bottom steel plate, a side supporting plate, a balancing weight, a first-stage lever, a connecting rod, a second-stage lever, a rotating rod, a friction plate and a friction plate. In the initial state, the gravity of the balancing weight block is amplified for the first time through the first-stage lever, the amplified gravity is transmitted to the second-stage lever through the connecting rod for amplification for the second time, and the amplified gravity vertically extrudes the friction plate through the rotating rod; when the damper enters a working stage, the friction plate deviates from a balance position, and the rotating rod generates a horizontal component which enables the damper to deviate from the balance position, namely a negative stiffness force is generated; meanwhile, the rotating rod has a vertical component perpendicular to the friction plate, so that the rotating rod generates friction force and provides friction damping, and the rotating rod and the friction plate simultaneously act to generate a hysteresis curve with negative rigidity. The invention can reduce the structural rigidity and improve the structural damping at the same time, and has very wide application prospect.
Description
Technical Field
The invention relates to a counterweight lever type negative stiffness friction damper which can be applied to vibration reduction control of an engineering structure and belongs to the technical field of vibration control.
Background
China is a country with frequent earthquakes, and collapse of buildings when earthquakes occur is a main reason for casualties, so people put forward higher requirements on the earthquake-resistant technology of house structures. At present, the shock-absorbing technology can effectively improve the anti-seismic performance of the structure, but the traditional shock-absorbing technology needs to arrange dampers on more floors, occupies a large amount of structural space and influences the use of the structure.
At present, the existing damper can effectively improve structural damping so as to improve the seismic performance of the structure, but the additional rigidity of the structure can be increased under some conditions, and the improvement of the additional rigidity can increase the seismic response of the structure. However, the counterweight lever type negative stiffness friction damper can effectively improve the structural damping, reduce the structural stiffness and effectively control the interlaminar shear force, the interlaminar displacement and the acceleration response of the structure.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a counterweight lever type negative stiffness friction damper which is used for reducing the structural stiffness and providing friction damping.
In order to achieve the purpose, the invention adopts the following technical scheme:
a counterweight lever type negative stiffness friction damper comprises a top steel plate, a bottom steel plate, side supporting plates, a counterweight block, a first-stage lever, a connecting rod, a second-stage lever, a rotating rod, a friction plate and a friction plate; the top steel plate, the bottom steel plate and the side supporting plate are welded to form an outer shell of the damper; the first-stage lever, the connecting rod and the second-stage lever are hinged to form a secondary lever system; the balancing weight is arranged at one end of the first-stage lever, and the other end of the first-stage lever is hinged in the middle of the first screw rod; the two ends of the connecting rod are hinged to the first-stage lever and the second-stage lever, one end of the connecting rod is hinged to the first-stage lever between the counterweight block hanging point and the first screw rod and is close to the first screw rod, the other end of the connecting rod is hinged to one end of the second-stage lever, and the other end of the second-stage lever is hinged to the middle of the second screw rod; the first screw rod and the second screw rod are arranged on the first-stage lever and the second-stage lever, and both ends of the first screw rod and the second screw rod are fixed on the side supporting plates; the two ends of the rotating rod are respectively hinged with the second-stage lever and the friction plate, wherein the hinged position of the rotating rod on the second-stage lever is arranged between a second screw rod on the second-stage lever and the connecting rod and is close to the second screw rod; the bottom of the friction plate is fixedly welded with a friction plate, and the other surface of the friction plate is in contact with a bottom steel plate.
Further, in the secondary lever system, the primary lever and the secondary lever are parallel and coplanar in an initial position after installation.
Further, the initial positions of the connecting rod and the rotating rod after installation are parallel to each other and perpendicular to the bottom steel plate.
Furthermore, the suspension point of the balancing weight is hinged with the first-stage lever through a screw rod, and the balancing weight is always perpendicular to the bottom steel plate when the height of the secondary lever system changes.
Furthermore, both ends of the connecting rod are hinged to the first-stage lever and the second-stage lever through screws; and two ends of the rotating rod are respectively hinged on the second-stage lever and the friction plate through a screw rod.
Further, the damper is installed on a building structure, the lower end of the damper is connected with the building structure through an ear plate on a friction plate, and the upper end of the damper is connected with the building structure through a bolt.
Further, in the initial state, the gravity of the balancing weight is amplified for the first time through the first-stage lever, the amplified gravity is transmitted to the second-stage lever through the connecting rod for the second time, and the amplified gravity vertically extrudes the friction plate through the rotating rod; when the damper enters a working stage, the friction plate deviates from a balance position, and the rotating rod generates a horizontal component which enables the damper to deviate from the balance position, namely a negative stiffness force is generated; meanwhile, the rotating rod has a vertical component perpendicular to the friction plate, so that the rotating rod generates friction force and provides friction damping, and the rotating rod and the friction plate simultaneously act to generate a hysteresis curve with negative rigidity.
Further, the side supporting plates are connected with the bottom steel plate in a welding mode.
Furthermore, the mechanical property of the balance weight lever type negative stiffness friction damper can be adjusted by changing the friction coefficient of the friction plate, the mass of the balancing weight, the length of the rotating rod and the amplification factor of the secondary lever system.
Furthermore, the friction plates are in multiple groups, and each friction plate is in a polygonal shape and is symmetrically arranged relatively.
Compared with the prior art, the invention can obtain the following technical effects:
the counterweight lever type negative stiffness friction damper has the advantages that:
1) the negative stiffness characteristic is obvious, the stroke of the damper is long, and the mechanical property is stable.
2) The mechanical properties of the counterweight lever type negative stiffness friction damper can be adjusted by changing the friction coefficient of the friction plate, the mass of the counterweight block, the length of the rotating rod and the lever amplification factor, so that the structural stiffness can be reduced, the structural damping can be improved, and the counterweight lever type negative stiffness friction damper has a very wide application prospect.
Drawings
FIG. 1 is a front view of a weighted lever type negative stiffness friction damper of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic view of the internal structure of the present invention;
FIG. 4 is a schematic illustration of the friction plate and friction plate mounting;
FIG. 5 is a schematic view of the top steel plate construction;
FIG. 6 is a schematic view of the bottom steel plate construction;
FIG. 7 is a first level lever structure configuration diagram;
FIG. 8 is a structural view of a connecting rod;
FIG. 9 is a second level lever structure configuration diagram;
FIG. 10 is a structural configuration view of the rotary rod;
FIG. 11 is a side panel construction view;
FIG. 12 is a schematic illustration of negative stiffness frictional damping generation;
FIG. 13 is a balance weight lever type negative stiffness friction damper test hysteresis curve of the present invention;
in the figure: 1-top steel plate, 2-bottom steel plate, 3-side supporting plate, 4-balancing weight, 5-first level lever, 6-connecting rod, 7-second level lever, 8-rotating rod, 9-friction plate, 10-friction plate, 16-horizontal component, 17-vertical component and 18-magnification.
Detailed Description
The structure and the using principle of the counterweight lever type negative stiffness friction damper are further explained with reference to the attached drawings 1-13.
As shown in fig. 1-11, the weight lever type negative stiffness friction damper of the present invention comprises a top steel plate 1, a bottom steel plate 2, a side support plate 3, a weight block 4, a first level lever 5, a connecting rod 6, a second level lever 7, a rotating rod 8, a friction plate 9, and a friction plate 10. As shown in fig. 1 and fig. 5 to 6, the top steel plate 1, the bottom steel plate 2 and the side support plates 3 are welded to form an outer shell of the damper, and the side support plates 3 are welded to the bottom steel plate 2. As shown in fig. 3, the first-stage lever 5, the connecting rod 6 and the second-stage lever 7 are hinged to form a secondary lever system. The balancing weight 4 is arranged at one end of the first-stage lever 5, and the other end of the first-stage lever 5 is hinged in the middle of the first screw rod. The both ends of connecting rod 6 are articulated on first order lever 5 and second level lever 7, and wherein, the one end of connecting rod 6 articulates on first order lever 5 between balancing weight 4 hang point and first screw rod, and is close to first screw rod setting, and the other end of connecting rod 6 articulates in second level lever 7 one end, and the other end of second level lever 7 articulates in the middle of the second screw rod. The first screw rod and the second screw rod which are arranged on the first-stage lever 5 and the second-stage lever 7 are both fixed on the side supporting plate 3. The two ends of the rotating rod 8 are respectively hinged with the second-stage lever 7 and the friction plate 9, wherein the hinged position of the rotating rod 8 on the second-stage lever 7 is arranged between the second screw rod on the second-stage lever 7 and the connecting rod 6 and is close to the second screw rod. The bottom of the friction plate 9 is fixedly welded with a friction plate 10, and the other side of the friction plate 10 is in contact with the bottom steel plate 2. In this embodiment, the friction plates 10 are 4 groups, and each friction plate 10 is polygonal and symmetrically disposed.
In the present embodiment, in the secondary lever system, the primary lever 5 and the secondary lever 7 are parallel and coplanar in the initial position after installation. The initial positions of the connecting rod 6 and the rotating rod 8 after installation are parallel to each other and are both vertical to the bottom steel plate 2. The suspension point of the balancing weight 4 is hinged with the first-level lever 5 through a screw rod, and the balancing weight 4 is always perpendicular to the bottom steel plate 2 when the height of the secondary lever system changes. Both ends of the connecting rod 6 are hinged on the first-stage lever 5 and the second-stage lever 7 through screws. Two ends of the rotating rod 8 are respectively hinged on the second-stage lever 7 and the friction plate 9 through screws.
In this example, the damper is mounted on the building structure, the lower end of the damper is connected to the building structure through the ear plate on the friction plate 9, and the upper end of the damper is connected to the building structure through the bolt. In the initial state, the gravity of the balancing weight 4 is amplified for the first time through the first-stage lever 5, the amplified gravity is transmitted to the second-stage lever 7 through the connecting rod 6 for the second time, and the amplified gravity vertically extrudes the friction plate 9 through the rotating rod 8. When the damper enters the working phase, the friction plate 9 is displaced from the equilibrium position and the rotating rod 8 generates a horizontal component 16 which displaces the damper from the equilibrium position, i.e. generates a negative stiffness force. At the same time, the rotating rod 8 provides frictional damping due to its vertical component 17 perpendicular to the friction plate 9, see fig. 12. The two act together to produce a hysteresis curve with negative stiffness characteristics, as shown in fig. 13.
The mechanical property of the balance weight lever type negative stiffness friction damper can be adjusted by changing the friction coefficient of the friction plate 10, the mass of the balancing weight 4, the length of the rotating rod 8 and the amplification factor of a secondary lever system.
The above-mentioned embodiments are only given for the purpose of more clearly illustrating the technical solutions of the present invention, and are not meant to be limiting, and variations of the technical solutions of the present invention by those skilled in the art based on the common general knowledge in the art are also within the scope of the present invention.
Claims (4)
1. The utility model provides a counter weight lever burden rigidity friction damper which characterized in that: the damper comprises a top steel plate (1), a bottom steel plate (2), a side supporting plate (3), a balancing weight (4), a first-stage lever (5), a connecting rod (6), a second-stage lever (7), a rotating rod (8), a friction plate (9) and a friction plate (10); the top steel plate (1), the bottom steel plate (2) and the side supporting plate (3) are welded to form an outer shell of the damper; the primary lever (5), the connecting rod (6) and the secondary lever (7) are hinged to form a secondary lever system; the balancing weight (4) is arranged at one end of the first-stage lever (5), and the other end of the first-stage lever (5) is hinged in the middle of the first screw rod; the two ends of the connecting rod (6) are hinged to the first-stage lever (5) and the second-stage lever (7), one end of the connecting rod (6) is hinged to the first-stage lever (5) between the hanging point of the balancing weight (4) and the first screw rod and is close to the first screw rod, the other end of the connecting rod (6) is hinged to one end of the second-stage lever (7), and the other end of the second-stage lever (7) is hinged to the middle of the second screw rod; the first screw rod and the second screw rod are arranged on the first-stage lever (5) and the second-stage lever (7), and both ends of the first screw rod and the second screw rod are fixed on the side supporting plates (3); the two ends of the rotating rod (8) are respectively hinged with the second-stage lever (7) and the friction plate (9), wherein the hinged position of the rotating rod (8) on the second-stage lever (7) is arranged between a second screw rod on the second-stage lever (7) and the connecting rod (6) and is close to the second screw rod; a friction plate (10) is fixedly welded at the bottom of the friction plate (9), and the other surface of the friction plate (10) is in contact with the bottom steel plate (2);
in an initial state, the gravity of the balancing weight (4) is amplified for the first time through the first-stage lever (5), the amplified gravity is transmitted to the second-stage lever (7) through the connecting rod (6) for amplification for the second time, and the amplified gravity vertically extrudes the friction plate (9) through the rotating rod (8); when the damper enters a working stage, the friction plate (9) deviates from a balance position, and the rotating rod (8) generates a horizontal component which enables the damper to deviate from the balance position, namely a negative stiffness force is generated; meanwhile, the rotating rod (8) has a vertical component vertical to the friction plate (9) to generate friction force and provide friction damping, and the rotating rod and the friction plate act simultaneously to generate a hysteresis curve with negative rigidity;
in the secondary lever system, the initial positions of the first-stage lever (5) and the second-stage lever (7) after installation are parallel and coplanar; the initial positions of the connecting rod (6) and the rotating rod (8) after installation are parallel to each other and are both vertical to the bottom steel plate (2); the suspension point of the balancing weight (4) is hinged with the first-stage lever (5) through a third screw rod, and the balancing weight (4) is always vertical to the bottom steel plate (2) when the height of the secondary lever system changes; both ends of the connecting rod (6) are hinged to the first-stage lever (5) and the second-stage lever (7) through fourth screws; two ends of the rotating rod (8) are respectively hinged to the second-stage lever (7) and the friction plate (9) through a fifth screw rod;
the damper is installed on a building structure, the lower end of the damper is connected with the building structure through an ear plate on a friction plate (9), and the upper end of the damper is connected with the building structure through a bolt.
2. The weighted lever type negative stiffness friction damper as claimed in claim 1, wherein: and the side supporting plate (3) is connected with the bottom steel plate (2) in a welding manner.
3. The weighted lever type negative stiffness friction damper as claimed in claim 1, wherein: the mechanical property of the balance weight lever type negative stiffness friction damper can be adjusted by changing the friction coefficient of the friction plate (10), the mass of the balancing weight (4), the length of the rotating rod (8) and the amplification factor of a secondary lever system.
4. The weighted lever type negative stiffness friction damper as claimed in claim 1, wherein: the friction plates (10) are in multiple groups, and each friction plate (10) is in a polygonal shape and is symmetrically arranged relatively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011131294.3A CN112411782B (en) | 2020-10-21 | 2020-10-21 | Balance weight lever type negative stiffness friction damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011131294.3A CN112411782B (en) | 2020-10-21 | 2020-10-21 | Balance weight lever type negative stiffness friction damper |
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| CN112411782A CN112411782A (en) | 2021-02-26 |
| CN112411782B true CN112411782B (en) | 2021-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011131294.3A Active CN112411782B (en) | 2020-10-21 | 2020-10-21 | Balance weight lever type negative stiffness friction damper |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0816571A1 (en) * | 1995-03-17 | 1998-01-07 | MORI, Kuninori | Foundation |
| CN205678265U (en) * | 2016-03-29 | 2016-11-09 | 江苏信泰机械有限公司 | A kind of lever balance suspension and support |
| CN106567908A (en) * | 2016-11-17 | 2017-04-19 | 石家庄铁道大学 | Segmented negative rigidity mechanism and vibration damping device provided with the same |
| CN107327194A (en) * | 2017-08-11 | 2017-11-07 | 清华大学 | A kind of brace type negative stiffness frcition damper |
| CN110145044A (en) * | 2019-05-15 | 2019-08-20 | 北京工业大学 | Negative stiffness damping device |
| CN111139730A (en) * | 2020-02-11 | 2020-05-12 | 东南大学 | Low-frequency vertical tuned mass damper with negative-stiffness nonlinear energy trap |
| CN111456473A (en) * | 2020-04-09 | 2020-07-28 | 魏国华 | Assembled building wall body antidetonation strutting arrangement |
| CN211499997U (en) * | 2019-11-28 | 2020-09-15 | 北京工业大学 | Half-cycle friction damper |
| CN111734775A (en) * | 2020-06-29 | 2020-10-02 | 哈尔滨工业大学 | Large-load ultralow-frequency air spring vibration isolator based on negative-stiffness magnetic spring |
-
2020
- 2020-10-21 CN CN202011131294.3A patent/CN112411782B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0816571A1 (en) * | 1995-03-17 | 1998-01-07 | MORI, Kuninori | Foundation |
| CN205678265U (en) * | 2016-03-29 | 2016-11-09 | 江苏信泰机械有限公司 | A kind of lever balance suspension and support |
| CN106567908A (en) * | 2016-11-17 | 2017-04-19 | 石家庄铁道大学 | Segmented negative rigidity mechanism and vibration damping device provided with the same |
| CN107327194A (en) * | 2017-08-11 | 2017-11-07 | 清华大学 | A kind of brace type negative stiffness frcition damper |
| CN110145044A (en) * | 2019-05-15 | 2019-08-20 | 北京工业大学 | Negative stiffness damping device |
| CN211499997U (en) * | 2019-11-28 | 2020-09-15 | 北京工业大学 | Half-cycle friction damper |
| CN111139730A (en) * | 2020-02-11 | 2020-05-12 | 东南大学 | Low-frequency vertical tuned mass damper with negative-stiffness nonlinear energy trap |
| CN111456473A (en) * | 2020-04-09 | 2020-07-28 | 魏国华 | Assembled building wall body antidetonation strutting arrangement |
| CN111734775A (en) * | 2020-06-29 | 2020-10-02 | 哈尔滨工业大学 | Large-load ultralow-frequency air spring vibration isolator based on negative-stiffness magnetic spring |
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Effective date of registration: 20211117 Address after: 100124 No. 100 Chaoyang District Ping Tian Park, Beijing Patentee after: Beijing University of Technology Patentee after: China nuclear power planning, design and Research Institute Co., Ltd Address before: 100124 No. 100 Chaoyang District Ping Tian Park, Beijing Patentee before: Beijing University of Technology |
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