CN107327194A - A kind of brace type negative stiffness frcition damper - Google Patents
A kind of brace type negative stiffness frcition damper Download PDFInfo
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- CN107327194A CN107327194A CN201710684602.7A CN201710684602A CN107327194A CN 107327194 A CN107327194 A CN 107327194A CN 201710684602 A CN201710684602 A CN 201710684602A CN 107327194 A CN107327194 A CN 107327194A
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- curved surface
- transversely deforming
- laminated rubber
- curved
- rubber spring
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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
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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
- E04H9/023—Bearing, supporting or connecting constructions specially adapted for such buildings and comprising rolling elements, e.g. balls, pins
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Vibration Prevention Devices (AREA)
Abstract
A kind of brace type negative stiffness frcition damper proposed by the present invention, belongs to civil engineering structure energy-eliminating shock-absorbing technical field, including transversely deforming constraint casing, curved surface friction member and axially connection support that the box house and the left and right sides are located at respectively；Curved surface friction member includes laminated rubber spring, it is located at the cunning case coaxial with the laminated rubber spring, curved surface adaptive sliding hinge and raised type friction curved slab that laminated rubber spring two ends are from the close-by examples to those far off set gradually respectively, this damper also includes an outer container, and sliding case and laminated rubber spring are respectively positioned on inside the outer container；Raised type friction curved slab is fixedly connected with transversely deforming constraint casing end plate, and the two end plates of transversely deforming constraint casing wear screw mandrel to laminated rubber spring application pretightning force by being fixed to wearing screw mandrel, and by this pair；The present invention is arranged in building structure, can reduce the equivalent stiffness of structure, increases structural damping, can control displacement and acceleration responsive of the structure under geological process, mitigates building damaged.
Description
Technical field
The present invention relates to civil engineering structure energy-eliminating shock-absorbing technical field, and in particular to a kind of brace type negative stiffness friction resistance
Buddhist nun's device.
Background technology
The earthquake of violent earthquake several times in recent years shows that the modern architecture by Aseismic Design can realize big shake not substantially
, but the damaged rehabilitation cost of structural elements (such as beam, post, shear wall) is high, time-consuming, be difficult to repair after shake or repair without
Ji, causes a large amount of damaged buildings to be forced to remove；In addition, non-structural element (such as filling wall, furred ceiling) and equipment are damaged serious, shadow
Ring Important building (such as hospital) being continuing with after shake.The relative storey displacement of the damaged and building of structural elements is excessive to be had
Close, the relative storey displacement of the damaged and building of non-structural element is excessive or flooring acceleration is excessive relevant.Therefore, to realize important
The fast quick-recovery of function after the shake of building, it is necessary to realize dual control to relative storey displacement and flooring acceleration, while reduce structural elements and
The seismic Damage of non-structural element.
At present, it is main in engineering to improve the anti-seismic performance of building structure by laying passive control damping unit.Tradition
Passive control device mainly include anti-buckling support, viscous damper, frcition damper etc., its mechanics principle is, passes through
Additional damping and rigidity into structure, reduce relative storey displacement response of the building structure under geological process.But, traditional is passive
Control device can not effectively reduce flooring acceleration responsive of the building structure under geological process, therefore can not reduce a large amount of acceleration
Spend the seismic Damage of relationship type non-structural element.
The content of the invention
In order to realize relative storey displacement and flooring acceleration dual control, it is an object of the invention to provide a kind of brace type negative stiffness
Frcition damper, " big damping " is added into structure, can increase energy dissipation capacity and equivalent damping of the structure under geological process
Than relative storey displacement response of the control structure under macroseism；Meanwhile, into structure introduce " negative stiffness ", can reduce structure etc.
Rigidity is imitated, total restoring force of structure reduces under same displacement, so as to effectively reduce the flooring acceleration responsive of structure.The present invention
Brace type negative stiffness frcition damper has simple structure, the features such as big, easily designed, laying is flexible of exerting oneself, can be in earthquake
The relative storey displacement of control structure and flooring acceleration responsive when similarly hereinafter are acted on, the fast quick-recovery energy of function after the shake of building structure is lifted
Power.
In order to achieve the above object, the technical solution adopted in the present invention is：
A kind of brace type negative stiffness frcition damper, it is characterised in that become including transversely deforming constraint casing, positioned at horizontal
The curved surface friction member of shape constraint box house and the axial direction connection support that casing arranged on left and right sides is constrained positioned at transversely deforming；
The transversely deforming constraint casing includes upper and lower end plate and left and right cover plate；The curved surface friction member includes laminated rubber bullet
Spring, the cunning case coaxial with the laminated rubber spring, the curved surface from the close-by examples to those far off set gradually positioned at laminated rubber spring two ends respectively
Adaptive sliding hinge and raised type friction curved slab；The damper also includes an outer container, sliding case and the equal position of laminated rubber spring
Inside the outer container, and the outer wall of sliding case is fitted with the inwall at the outer container two ends, can be occurred along lamination rubber between sliding case and outer container
The relative slip of glue spring axial direction；Wherein, the end plate of transversely deforming constraint casing is rubbed by frictional high-strength bolts with raised type
Wipe curved slab to be fixedly connected, the upper and lower end plate of transversely deforming constraint casing wears screw mandrel by fixing to wearing screw mandrel by this pair
Apply precompression to laminated rubber spring；After precompression applies in place, constrained using high-strength friction bolt connection transversely deforming
The end plate and cover plate of casing, to fix the relative position of two end plates；The axial direction connection branch on the right side of casing is constrained positioned at transversely deforming
Support one end is fixed with transversely deforming constraint casing right cover plate, and the node of the axial direction connection support other end and building structure is fixed；
The axial direction connection on the left of casing is constrained positioned at transversely deforming supports one end and the left side wall of outer container in curved surface friction member to fix, should
Axially the connection support other end and the node of building structure are fixed.
The negative stiffness frcition damper, the raised type friction curved slab has raised type round surface, and the round surface
Rough surface.
The negative stiffness frcition damper, the sliding case is set with the supporting setting of curved surface adaptive sliding hinge, sliding case surface
There are curved indentations, curved surface adaptive sliding hinge is made up of two curved surface cuttings；Wherein, the inner sunken face of curved surface adaptive sliding hinge
Fitted with the raised type round surface of raised type friction curved slab, and occur relative slide；The evagination of curved surface adaptive sliding hinge
The curved indentations of curved surface and sliding case fit, and relatively rotate；Sliding case is moved through in the negative stiffness frcition damper certainly
Translation is remained in journey.
Compared to the prior art the present invention, has the following advantages that：
(1) " negative stiffness " characteristic：The force-displacement curve of the present invention has significant negative stiffness characteristic, i.e., adaptive with curved surface
Sliding hinge and the increase of raised type friction curved slab relative motion are answered, force of sliding friction between the two is gradually reduced.Because this is negative
Stiffness characteristics, this damper can reduce the equivalent stiffness of building structure, reduce flooring of the building under geological process and accelerate
Degree response.By controlling the flooring acceleration responsive of building structure, a large amount of acceleration relationship type non-structural elements are effectively reduced
Seismic Damage, improves function fast restoration capabilities after the shake of building.
(2) energy dissipation capacity is strong, and anti-seismic performance is superior：The present invention passes through force of sliding friction dissipation seismic energy, sliding friction
Power belongs to Coulomb damping.Make Free Vibration of Systems different by exponential damping from conventional viscous damping, Coulomb damping can make body
Be free vibration by linear attenuation, with higher damping efficiency.Therefore, the present invention can be additional bigger etc. to building structure
Effect damping, reduces the vibratory response of building structure, improves the anti-seismic performance of building structure.
(3) joints are good：The present invention increases with curved surface adaptive sliding hinge and raised type friction curved slab relative displacement
Plus, the damper is exerted oneself reduction；At maximum displacement, it is zero that the damper, which is exerted oneself,.Therefore, the present invention and the connection of building structure
Joints can avoid traditional support-frame structure interior joint maximal bending moment from being coupled with the maximum axle power of support, joints are complicated
The problem of.
The present invention realizes " negative stiffness " and effective combination of " big damping ", can realize the relative storey displacement to building structure
With the dual control of flooring acceleration, the damage of reduction Structures under Earthquake component and non-structural element improves the shake of building structure
Function fast restoration capabilities afterwards, with good marketing application prospect.
Brief description of the drawings
Fig. 1 is overall structure diagram of the invention.
Fig. 2 is integrally-built diagrammatic cross-section of the invention.
Fig. 3 is the stress sketch of raised type of the present invention friction curved slab.
Fig. 4 is raised type of the present invention friction curved slab and the geometrical relationship schematic diagram of curved surface adaptive sliding hinge.
Fig. 5 is the hesteresis curve figure of the embodiment of the present invention.
Embodiment
Technical scheme is described in further details with specific embodiment below in conjunction with the accompanying drawings.
A kind of brace type negative stiffness frcition damper proposed by the present invention, overall structure such as Fig. 1, cross-section structure such as Fig. 2 institutes
Show, the damper includes transversely deforming constraint casing, and (the transversely deforming constraint casing of the present embodiment is front and rear open, is actually made
Closed box can be also used in), positioned at transversely deforming constrain box house curved surface friction member and positioned at transversely deforming
Constrain the axial direction connection support of casing arranged on left and right sides；Transversely deforming constraint casing includes upper head plate 5-1, bottom plate 5-2, right cover
Plate 6-1 and left cover 6-2；Curved surface friction member include laminated rubber spring 4, respectively positioned at the two ends of laminated rubber spring 4 by
The proximal and distal cunning case 3 coaxial with the laminated rubber spring that be setting gradually, curved surface adaptive sliding hinge 2 and raised type friction are bent
Panel 1；The damper also includes an outer container 7, and sliding case 3 and laminated rubber spring 4 are respectively positioned on inside the outer container, and slide the outer of case 3
Wall is fitted with the inwall at the outer container two ends, and sliding relatively along the axial direction of laminated rubber spring 4 can occur between sliding case 3 and outer container 7
It is dynamic；The end plate of transversely deforming constraint casing is fixedly connected by frictional high-strength bolts and raised type friction curved slab 1, is laterally become
The upper and lower end plate of shape constraint casing wears screw mandrel 9 to laminated rubber spring 4 by this pair and applies pre- by being fixed to wearing screw mandrel 9
Pressure；After precompression applies in place, the end plate and cover plate of casing are constrained using high-strength friction bolt connection transversely deforming, with solid
Determine the relative position of two end plates；The axial direction connection on the right side of casing is constrained positioned at transversely deforming and supports 8-1 one end and transversely deforming about
Beam casing right cover plate is fixed, axially the connection support 8-1 other ends and node (such as bean column node, the shear wall-coupling beam of building structure
Node etc.) it is fixed, constrain axial direction connection support 8-2 one end on the left of casing and outer container in curved surface friction member positioned at transversely deforming
7 left side wall is fixed, and axially the connection support 8-2 other ends and the node of building structure are fixed.
The raised type friction curved slab 1 has raised type round surface, and the round surface rough surface (cunning of the round surface
It is fixed that the coefficient of kinetic friction can take according to the use demand of this damper, in the present embodiment, and the coefficient of sliding friction is 0.40) height
(in the present embodiment, the average face pressure of contact portion is high between raised type friction curved slab and curved surface adaptive sliding hinge for pressure-bearing
Up to 25MPa) under the conditions of can keep the stable coefficient of sliding friction.Raised type friction curved slab constrains end plate with transversely deforming
It is bolted, it is easy to disassemble to change, be easy to maintenance reparation.The raised type friction curved slab 1 of the present embodiment is rubbed using organic
Wiping material mold, which is poured, to be formed, and the coefficient of sliding friction of curved surface is 0.40, and maximum can bear face pressure and reach 30MPa, to make
Curved slab is easy to assembly, sets steel liner plate in curved slab bottom surface, thickness is 10mm.
The sliding case 3 and the supporting setting of curved surface adaptive sliding hinge 2, as shown in Figure 2；It is recessed that the sliding surface of case 3 is provided with curved surface
Groove；Curved surface adaptive sliding hinge 2 is made up of two curved surface cuttings, and inner sunken face and the raised type of curved surface adaptive sliding hinge 2 rub
The raised type round surface for wiping curved slab 1 fits, and occurs phase between curved surface adaptive sliding hinge 2 and raised type friction curved slab 1
To sliding, force of sliding friction is produced；The curved indentations of the convex outward of curved surface adaptive sliding hinge 2 and sliding case 3 fit, and bent
The convex outward surface spraying of surface self-adaption sliding hinge 2 has antifriction material (in the present embodiment, using polytetrafluoroethylene spray material
0.05) material, the coefficient of sliding friction on surface is less than, and relatively rotates, contacts between curved surface adaptive sliding hinge 2 and sliding case 3
Partial frictional force is substantially zeroed；In the motion process of the negative stiffness frcition damper, curved surface adaptive sliding hinge 2 is in raised type
All the time slip is brought into close contact on friction curved slab 1, sliding case 3 itself remains translation without rotating.The cunning of the present embodiment
Case 3 uses common iron with curved surface adaptive sliding hinge 2, is processed by numerical control machine tool cutting；Wherein curved surface adaptive
The curved indentations of the convex outward of sliding hinge 2, inner sunken face and sliding case 3 should meet certain rough surface according to requirements
Precision is spent, in the present embodiment, the surface roughness of the curved indentations of the convex outward of curved surface adaptive sliding hinge 2 and sliding case 3
For Ra1.6, the surface roughness of the inner sunken face of curved surface adaptive sliding hinge 2 is Ra6.3.Meanwhile, curved surface adaptive sliding hinge 2
Convex outward surface spraying have a polytetrafluoroethylene (PTFE) antifriction material, the coefficient of sliding friction of convex outward is less than 0.05.
The laminated rubber spring 4 has the characteristic that axial rigidity is big, axial bearing capacity is high, it is ensured that outside male friction is bent
Panel 1 provides sufficiently large normal pressure.The precompression of the laminated rubber spring constrains casing by transversely deforming and applied, and passes through
Control, which is applied to, can realize the regulation and control to precompression to the external force worn on screw mandrel 9.In the present embodiment, laminated rubber bullet
The laminated rubber bases that spring is commonly used in 4 engineerings are composed in series, and laminated rubber bases are according to national standard《GB 20688.3-
2006 rubber supports-Part III：Architectural vibration-insulation rubber supporting seat》Design and produce, by the laminated rubber with lead for retractable pencil and its two ends
Steel connecting plate is constituted, and the vertical rigidity of single laminated rubber bases reaches that 100kN/mm, limit face pressure reach more than 30MPa.
The assembling process of brace type negative stiffness frcition damper of the present invention is as follows：Laminated rubber spring 4 is with sliding case 3 by general
Logical bolt connection, and in outer container 7；Raised type friction curved slab 1 leads to transversely deforming constraint casing end plate (5-1,5-2)
Frictional high-strength bolts are crossed firmly to connect；Laminated rubber spring 4, sliding case 3, curved surface adaptive sliding hinge 2 and raised type are rubbed
Wiping curved slab 1, centering is stacked in order, and by wearing screw mandrel 9 to the application precompression of laminated rubber spring 4；Precompression is applied to
Behind position, the end plate (5-1,5-2) and cover plate (6-1,6-2) of casing are constrained using high-strength friction bolt connection transversely deforming, with
The relative position of fixed two end plates, it is to avoid two end plates relatively rotate in the damper course of work.So far, present invention support
The assembly of formula negative stiffness frcition damper is completed, as shown in Figure 1.
Brace type negative stiffness frcition damper is assembled to be formed after entirety, is transported to scene, and it is axially connected to the two ends of support
The node with building structure is reliably connected by bolt formation respectively.This damper is applied to building structure with supporting form, can
Laid with oblique, this damper shaft is to the angle of (i.e. the line direction of the node of building structure two of connection damper) and construction floor
Degree is flexible.
The operation principle of brace type negative stiffness frcition damper of the present invention is described below：
Under geological process, in its line direction relative displacement occurs for the node of building structure two of connection damper, by axle
It is axially moved to connection supporting drive outer container 7 along this damper, causes curved surface adaptive sliding hinge 2 in raised type friction curved slab
Slided on 1.In the relative movement of curved surface adaptive sliding hinge and raised type friction curved slab, laminated rubber spring 4
Compressive state is remained, therefore, curved surface adaptive sliding hinge 2 and the relative slip of raised type friction curved slab 1 will produce cunning
Kinetic force of friction, and with the reciprocating motion of damper, dissipation seismic energy.
The interaction of curved surface adaptive sliding hinge 2 and raised type friction curved slab 1 is reduced to contact in single point set, and
With reference to Fig. 3 and Fig. 4 stress sketch, with curved surface adaptive sliding hinge 2 for force analysis object (rectangular shaped slider is reduced on figure),
Exert oneself F the axial direction that the present invention can be obtainedHWith the functional relation of displacement x to axial, i.e., brace type negative stiffness friction of the present invention
The resilience model of damper, specific derivation is as follows.Wherein, X-axis described in figure and this damper are axially in parallel.
Stress sketch according to Fig. 3, can be listed under the different direction of motion, vertical precompressed laminated rubber spring
4 normal pressure FVExerted oneself F with the axial direction of this brace type negative stiffness frcition damperHThe relational expression met, respectively such as formula (1) and
Shown in formula (2)：
Fv=Fσ·cosα+sgn(x·v)·Fτ·sinα (1)
FH=-sgn (xv) Fσ·sinα+Fτ·cosα (2)
In formula, FVRepresent the normal pressure that laminated rubber spring 4 is subject to, FHRepresent this brace type negative stiffness frcition damper
Axially exert oneself；FσRepresent to act on the normal pressure for a little acting on curved surface adaptive sliding hinge 2 on raised type friction curved slab 1；Fτ
Represent in the motion process of curved surface adaptive sliding hinge 2, raised type friction curved slab 1 acts on the cunning of the curved surface adaptive sliding hinge
Kinetic force of friction；X represents curved surface adaptive sliding hinge and the relative displacement of raised type friction curved slab, consistent with X-axis positive direction to take
1, otherwise take -1；V represents the direction of motion of curved surface adaptive sliding hinge, consistent with X-axis positive direction to take 1, otherwise takes -1；sgn
(xv) symbol of the displacement with direction of motion product of curved surface adaptive sliding hinge is represented, product takes 1 when being positive number, otherwise take-
1。
By the mechanical model of force of sliding friction, FσWith FτThere is relation listed by formula (3), wherein μ represents raised type friction curved slab
1 coefficient of sliding friction：
Fτ=μ Fσ (3)
By formula (1)~formula (3) simultaneous, exert oneself F for the axial direction of export brace type negative stiffness frcition damperHWith vertical precompressed rubber
The normal pressure F of glue springVRelation, as shown in formula (4)：
According to the operation principle of brace type negative stiffness frcition damper of the present invention, vertical precompressed laminated rubber spring 4 is just
Pressure FV, the normal direction of any and the angle α of vertical direction are relative horizontal displacement x functions on raised type friction curved slab 1, point
F is not usedV(x), α (x) is represented.According to Fig. 4, F can be releasedV(x), α (x) expression formula is respectively as shown in formula (5), formula (6)：
In formula, P0Represent curved surface adaptive sliding hinge and raised type rub curved slab relative displacement as zero when, it is vertical pre-
Press the normal pressure of laminated rubber spring 4；K represents the vertical rigidity of precompressed laminated rubber spring 4；R represents raised type friction curved surface
The radius of circle where the raised type round surface of plate 1.
Composite type (4), formula (5) and formula (6), arrangement obtain the F that axially exerts oneselfHWith the functional relation F of displacement x to axialH
(x), as shown in formula (7)：
Fig. 5 depicts P0Hesteresis curve when=1000kN, k=50kN/mm, R=500mm, μ=0.40, can see
Arrive, the hesteresis curve of brace type negative stiffness frcition damper of the present invention is formed by stacking by negative stiffness and damping.Therefore, in earthquake
Under effect, the present invention can reduce the equivalent stiffness of structure, reduce the acceleration responsive of structure；Meanwhile, pass through force of sliding friction
Dissipation seismic energy, reduces the vibratory response of structure, the anti-seismic performance of lift structure.
Claims (4)
1. a kind of brace type negative stiffness frcition damper, it is characterised in that including transversely deforming constraint casing, positioned at transversely deforming
Constrain the curved surface friction member of box house and the axial direction connection support of casing arranged on left and right sides is constrained positioned at transversely deforming；Institute
Stating transversely deforming constraint casing includes upper and lower end plate and left and right cover plate；The curved surface friction member includes laminated rubber spring,
The cunning case coaxial with the laminated rubber spring, the curved surface from the close-by examples to those far off set gradually positioned at laminated rubber spring two ends respectively is adaptive
Answer sliding hinge and raised type friction curved slab；The damper also includes an outer container, and sliding case and laminated rubber spring are respectively positioned on this
Inside outer container, and the outer wall of sliding case is fitted with the inwall at the outer container two ends, can be occurred along laminated rubber bullet between sliding case and outer container
The relative slip of spring axial direction；Wherein, the end plate of transversely deforming constraint casing is rubbed bent by frictional high-strength bolts and raised type
Panel is fixedly connected, and the upper and lower end plate of transversely deforming constraint casing wears screw mandrel to folded by being fixed to wearing screw mandrel, and by this pair
Layer rubber spring applies precompression；After precompression applies in place, casing is constrained using high-strength friction bolt connection transversely deforming
End plate and cover plate, to fix the relative position of two end plates；The axial direction connection support one on the right side of casing is constrained positioned at transversely deforming
End is fixed with transversely deforming constraint casing right cover plate, and the node of the axial direction connection support other end and building structure is fixed；It is located at
Axial direction connection support one end and the left side wall of outer container in curved surface friction member on the left of transversely deforming constraint casing are fixed, the axial direction
The connection support other end and the node of building structure are fixed.
2. negative stiffness frcition damper according to claim 1, it is characterised in that the raised type friction curved slab has
Raised type round surface, and the round surface rough surface.
3. negative stiffness frcition damper according to claim 2, it is characterised in that the sliding case is slided with curved surface adaptive
Hinge is supporting to be set, and sliding case surface is provided with curved indentations, and curved surface adaptive sliding hinge is made up of two curved surface cuttings；Wherein, it is bent
The raised type round surface of the inner sunken face of surface self-adaption sliding hinge and raised type friction curved slab fits, and occurs to slide relatively
It is dynamic；The curved indentations of the convex outward of curved surface adaptive sliding hinge and sliding case fit, and relatively rotate；Sliding case from
Translation is remained in the negative stiffness frcition damper motion process.
4. negative stiffness frcition damper according to claim 3, it is characterised in that outside the curved surface adaptive sliding hinge
The surface spraying of convex surface has antifriction material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710684602.7A CN107327194B (en) | 2017-08-11 | 2017-08-11 | Supporting type negative-stiffness friction damper |
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| CN108952291A (en) * | 2018-10-10 | 2018-12-07 | 中南大学 | A kind of novel steel bar metallic damper |
| CN112411782A (en) * | 2020-10-21 | 2021-02-26 | 北京工业大学 | Balance weight lever type negative stiffness friction damper |
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| CN112411782B (en) * | 2020-10-21 | 2021-10-26 | 北京工业大学 | Balance weight lever type negative stiffness friction damper |
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