CN116292729A - Assembled magnetic negative stiffness viscous damper - Google Patents

Assembled magnetic negative stiffness viscous damper Download PDF

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Publication number
CN116292729A
CN116292729A CN202310292721.3A CN202310292721A CN116292729A CN 116292729 A CN116292729 A CN 116292729A CN 202310292721 A CN202310292721 A CN 202310292721A CN 116292729 A CN116292729 A CN 116292729A
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CN
China
Prior art keywords
permanent magnet
piston
piston rod
cylinder
negative stiffness
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Pending
Application number
CN202310292721.3A
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Chinese (zh)
Inventor
杨朔
吴思远
杨燕
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China Construction Eighth Engineering Division Co Ltd
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China Construction Eighth Engineering Division Co Ltd
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Publication date
Application filed by China Construction Eighth Engineering Division Co Ltd filed Critical China Construction Eighth Engineering Division Co Ltd
Priority to CN202310292721.3A priority Critical patent/CN116292729A/en
Publication of CN116292729A publication Critical patent/CN116292729A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/005—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper
    • F16F13/007—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a wound spring and a damper, e.g. a friction damper the damper being a fluid damper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/30—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium
    • F16F9/303—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium the damper being of the telescopic type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/50—Special means providing automatic damping adjustment, i.e. self-adjustment of damping by particular sliding movements of a valve element, other than flexions or displacement of valve discs; Special means providing self-adjustment of spring characteristics
    • F16F9/512—Means responsive to load action, i.e. static load on the damper or dynamic fluid pressure changes in the damper, e.g. due to changes in velocity
    • F16F9/5126—Piston, or piston-like valve elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2222/00—Special physical effects, e.g. nature of damping effects
    • F16F2222/06—Magnetic or electromagnetic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2222/00—Special physical effects, e.g. nature of damping effects
    • F16F2222/12—Fluid damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/06—Stiffness
    • F16F2228/063—Negative stiffness

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The invention discloses an assembled magnetic negative stiffness viscous damper which comprises a piston rod, a permanent magnet piston, an elastic assembly, a first fixed permanent magnet, a second fixed permanent magnet and a cylinder barrel, wherein the piston rod is provided with a first permanent magnet; the permanent magnet piston is driven by the piston rod to move between the first fixed permanent magnet and the second fixed permanent magnet; the three magnets are oppositely arranged according to opposite attraction, so that the resultant force of attraction force born by the permanent magnet piston is the same as the displacement direction, and a negative stiffness effect is generated; meanwhile, viscous liquid in the cylinder barrel passes through a gap between the permanent magnet piston and the cylinder barrel in the motion process of the permanent magnet piston, and the generated damping force converts vibration energy into heat energy; and secondly, the elastic component automatically resets the piston rod through acting force generated by the movement of the piston rod. The scheme can realize the organic combination of negative rigidity, high damping, self-resetting and assembly, obviously reduce the dynamic response of the structure under external vibration or earthquake excitation, and improve the reliability of the negative rigidity damper.

Description

Assembled magnetic negative stiffness viscous damper
Technical Field
The invention relates to the technical field of civil engineering, in particular to an assembled magnetic negative stiffness viscous damper for vibration control.
Background
The negative stiffness is opposite to the positive stiffness, the restoring force of the positive stiffness structure or device always points to the equilibrium point, the restoring force of the negative stiffness structure or device always points away from the equilibrium point, i.e. the positive stiffness always acts against the external force to pull the structure or device back to the equilibrium position, whereas the negative stiffness pushes the structure or device away from the equilibrium position.
The negative stiffness damper can reduce the total stiffness of the structure, increase the period of the structure, and has larger energy consumption capacity than the traditional damper, so that the dynamic response of the structure under external vibration or earthquake excitation can be remarkably reduced. The negative stiffness damper can be used in the fields of civil engineering and mechanical engineering, such as shock absorption and isolation of building and bridge structures, vehicle seat suspensions and shock absorption control of precise instruments.
Negative stiffness dampers are classified into active, semi-active and passive types, wherein the passive type negative stiffness dampers do not require external energy input and do not require a complicated feedback system, so that the production and installation difficulties and costs thereof are lower than those of the active and semi-active types. However, there are still some problems with the existing passive type negative stiffness dampers that need improvement.
First, passive negative stiffness dampers often suffer from insufficient self-restoring capability, and are difficult to restore to a pre-earthquake equilibrium position after an earthquake, so that the damper and structure connection still needs to be subjected to additional force after the earthquake to counteract the negative stiffness restoring force generated away from the equilibrium position.
Second, the damping force of the conventional passive type negative stiffness damper is still not large enough, and it is difficult to further improve the damping thereof after the completion of the processing and manufacturing.
Finally, passive negative stiffness dampers are usually integral, and are difficult to disassemble, replace and expand a single component, so that the difficulty of maintenance and post-disaster replacement is high at ordinary times, and the cost required in the life cycle of the structure is high.
In conclusion, the existing passive negative stiffness damper has the problems of insufficient self-resetting capability, low damping force, difficult adjustment, difficult maintenance and replacement, high cost and the like, and the reliability of the negative stiffness damper is greatly reduced.
It follows that how to improve the reliability of a negative stiffness damper is a problem to be solved in the art.
Disclosure of Invention
Aiming at the technical problem of low reliability of the existing passive negative stiffness damper, the invention aims to provide an assembled magnetic negative stiffness viscous damper which can realize the organic combination of negative stiffness, high damping, self-resetting and assembly, remarkably reduce the dynamic response of the structure under external vibration or earthquake excitation and greatly improve the reliability of the negative stiffness damper.
In order to achieve the above purpose, the invention provides an assembled magnetic negative stiffness viscous damper, which comprises a piston rod, a permanent magnet piston, an elastic component, a first fixed permanent magnet, a second fixed permanent magnet and a cylinder barrel; the first fixed permanent magnet and the second fixed permanent magnet are arranged at two ends of the cylinder barrel to form a piston barrel assembly, the permanent magnet piston is arranged at one end of the piston rod and penetrates through the piston barrel assembly to be arranged in the cylinder barrel, and the permanent magnet piston moves between the first fixed permanent magnet and the second fixed permanent magnet under the driving of the piston rod; the magnets of adjacent magnets are oppositely arranged according to opposite attraction between the first fixed permanent magnet, the permanent magnet piston and the second fixed permanent magnet, so that the resultant force of attraction born by the permanent magnet piston is the same as the displacement direction, and a negative stiffness effect is generated;
the interior of the cylinder barrel is provided with viscous liquid, and the viscous liquid passes through a gap between the permanent magnet piston and the cylinder barrel in the motion process of the permanent magnet piston, so that damping force is generated and vibration energy is converted into heat energy;
the elastic component is positioned between the piston rod and the first fixed permanent magnet, and the piston rod is automatically reset under the action force generated by the movement of the piston rod.
Further, the first fixed permanent magnet is assembled and connected with one end of the cylinder barrel through the first magnet cavity.
Further, the first magnet cavity, the first fixed magnet and one end of the cylinder barrel are provided with through holes for the piston rod to pass through, and the through holes of the first magnet cavity, the first fixed magnet and the cylinder barrel are located on the same axis.
Further, a piston sealing ring is arranged between the first fixed permanent magnet and the cylinder barrel.
Further, the second fixed permanent magnet is assembled and connected with the other end of the cylinder barrel through the second magnet cavity.
Further, the cylinder barrel is respectively provided with a liquid inlet component and a liquid outlet component.
Further, a permanent magnet piston protective sleeve is arranged outside the permanent magnet piston and is matched with a fixing piece for fixing.
Further, the elastic component comprises a spring connecting plate and a spring, the spring connecting plate is sleeved on the piston rod, and the spring is sleeved on the piston rod, and two ends of the spring are respectively abutted to the spring connecting plate and the first magnet cavity.
Further, the assembled magnetic negative stiffness viscous damper further comprises an earring assembly, the earring assembly comprises a first earring and a second earring, the first earring is connected with the piston rod in a matched mode, and the second earring is connected with the second magnet cavity in a matched mode to form an integrated structure.
Further, the assembled magnetic negative stiffness viscous damper further comprises an expansion structure, and the expansion structure is formed by sequentially assembling the piston cylinder assemblies.
According to the assembled magnetic negative-stiffness viscous damper, firstly, the elastic component is arranged on the damper, so that the damper can be reset automatically according to elastic restoring force.
According to the scheme, the movable magnet and the two fixed magnets are arranged, when the movable magnet approaches to the fixed magnet on one side, attractive force between the two magnets is rapidly increased, and according to the characteristic that the damping force is in direct proportion to the speed, the damping force of the damping device can be ensured to be larger than that of a conventional damper.
Meanwhile, the damper in the scheme is of an assembled structure, the components are easy to assemble, disassemble and replace, and the reliability of the negative stiffness damper is greatly improved.
Drawings
The invention is further described below with reference to the drawings and the detailed description.
FIG. 1 is a cross-sectional view of the present fabricated magnetic negative stiffness viscous damper;
FIG. 2 is an assembled schematic diagram of the components of the present assembled magnetic negative stiffness viscous damper;
FIG. 3 is a three-dimensional schematic diagram of components of the present fabricated magnetic negative stiffness viscous damper;
FIG. 4 is an expanded version of the present fabricated magnetic negative stiffness viscous damper with two cylinders;
fig. 5 is a schematic diagram of the principle of negative stiffness of the present fabricated magnetic negative stiffness viscous damper.
The following is a description of the components in the drawings:
1. the piston rod comprises a first earring 2, a piston rod 3, a spring connecting plate 4, a spring 5, a first magnet cavity 6, a first fixed permanent magnet 7, a piston sealing ring 8, a cylinder barrel 9, viscous liquid 10, a liquid inlet assembly 11, a fixed bolt 12, a permanent magnet piston 13, a permanent magnet piston protecting sleeve 14, a liquid outlet assembly 15, a second magnet cavity 16, a second fixed permanent magnet 17, a fixed rod 18 and a second earring.
Detailed Description
The invention is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the implementation of the invention easy to understand.
The existing passive negative stiffness damper has the technical problems of low damping force and high disassembly and assembly difficulty because of insufficient self-resetting capability, so that reliable operation of the passive negative stiffness damper cannot be realized.
In this regard, the invention provides an assembled magnetic negative stiffness viscous damper which can realize the organic combination of negative stiffness, high damping, self-resetting and assembly, remarkably reduce the dynamic response of the structure under the excitation of external vibration or earthquake, and greatly improve the reliability of the negative stiffness damper.
The assembled magnetic negative stiffness viscous damper provided by the scheme comprises an earring assembly, a piston assembly, an elastic assembly and a piston cylinder assembly.
Referring to fig. 1-3, the earring assembly comprises a first earring 1 and a second earring 18, wherein the first earring 1 is in fit connection with the piston assembly, and the second earring 18 is in fit connection with the piston cylinder assembly.
Further, the second ear ring 18 is disposed opposite and in assembled connection with the second side of the piston cylinder assembly.
The end part of the first earring 1 connected with the piston assembly is provided with an external thread structure, and the first earring is connected with the piston assembly in a threaded detachable manner through the external thread structure, so that the later disassembly and assembly are convenient.
The piston assembly is assembled with the first earring 1 and the piston cylinder assembly respectively, and can enter the piston cylinder assembly to axially move in the piston cylinder assembly, and the piston assembly comprises a piston rod 2 and a permanent magnet piston 12.
Wherein, the first end of piston rod 2 is equipped with the internal thread, with the external screw thread adaptation of first earring 1, through internal thread and external screw thread cooperation, carries out threaded assembly connection with first earring 1 with the first end of piston rod 2.
An external thread structure is provided near the first end of the piston rod 2 for cooperation with the elastic assembly, enabling an assembled connection with the elastic assembly.
The second end of the piston rod 2 is provided with an external thread structure, the permanent magnet piston 12 can be arranged, the permanent magnet piston 12 is a hollow cylinder, the hollow part of the permanent magnet piston 12 is a cylinder with the diameter slightly larger than that of the piston rod 2, the permanent magnet piston 12 can be sleeved on the second end of the piston rod 2 and is in threaded sleeve connection with the second end of the piston rod 2, and the permanent magnet piston 12 is arranged inside a piston cylinder assembly after being assembled at the second end of the piston rod 2 and can axially move along the piston cylinder assembly inside the piston cylinder assembly.
The permanent magnet piston protecting sleeve 13 is arranged on the periphery of the permanent magnet piston 12 and is matched with the nut to fasten the permanent magnet piston 12 and the piston rod 2, and the permanent magnet piston 12 can be protected by arranging the permanent magnet piston protecting sleeve 13 on the periphery of the permanent magnet piston 12, so that the influence on the damping force in the later stage due to the interference of external factors on the magnetic field of the permanent magnet piston 12 is avoided.
And an elastic component is arranged on the first side of the first earring 1 and the first side of the piston cylinder component and is used for the self-confidence resetting of the piston rod 2. The elastic assembly comprises a spring connection plate 3 and a spring 4.
The spring connecting plate 3 is arranged on the second external thread structure of the piston rod 2, the spring connecting plate 3 is sleeved on the piston rod 2 through threaded connection, a gap is reserved between the spring connecting plate 3 and the piston cylinder assembly, and an action area of the spring 4 is formed.
The inner diameter of the spring 4 is larger than that of the piston rod 2, the spring 4 can be sleeved on the piston rod 2 but is not in contact with the piston rod 2, the maximum deformation of the spring 4 can be achieved, and two ends of the spring 4 are respectively abutted with the spring connecting plate 3 and the first end of the piston cylinder assembly.
When external vibration is transmitted to the piston rod 2, the piston rod 2 drives the permanent magnet piston 12 to move, when the permanent magnet piston 12 moves in the axial direction of the first direction in the piston cylinder assembly, the spring connecting plate 3 compresses the spring 4 to deform, and meanwhile, when vibration is consumed, and no external force factor exists, the elastic restoring force of the spring 4 can drive the piston rod 2 to reset automatically.
The piston cylinder assembly comprises a first magnet cavity 5, a cylinder 8, a second magnet cavity 15, a first fixed permanent magnet 6 and a second fixed permanent magnet 16.
The first magnet cavity 5 is hollow cylinder, and the hollow part of first magnet cavity 5 one side is the cylinder that the diameter is slightly greater than the diameter of piston rod 2, can allow piston rod 2 to pass through, and the opposite side hollow part is the cylinder cavity that the diameter is less than the external diameter of cylinder 8, and the cavity is equipped with the external screw thread, can link to each other with the internal screw thread of cylinder 8 one side.
The first fixed permanent magnet 6 is assembled in the first magnet cavity 5, the first fixed permanent magnet 6 is a hollow cylinder, the hollow part of the first fixed permanent magnet 6 is a cylinder with the diameter slightly larger than that of the piston rod 2, and the cylinder is sleeved on the piston rod 2 and fixed between the first magnet cavity 5 and the first end of the cylinder barrel 8.
The second magnet cavity 15 is a hollow cylinder, is integrated with the second earring 18, can be used for placing the fixing rod 17 and the second fixing permanent magnet 16, the hollow part of the second magnet cavity 15 is a cylindrical cavity with the diameter smaller than the outer diameter of the cylinder barrel 8, and the cavity is provided with external threads and can be connected with the internal threads on one side of the cylinder barrel 8.
The second fixed permanent magnet 16 is assembled in the second magnet cavity 15, the second fixed permanent magnet 16 is a hollow cylinder, the hollow part of the second fixed permanent magnet 16 is a cylinder with the diameter slightly larger than that of the fixed rod 17, the second fixed permanent magnet is sleeved on the fixed rod 17, and the second fixed permanent magnet is integrally and fixedly connected between the second magnet cavity 15 and the second end of the cylinder barrel 8 in a threaded manner through the fixed rod 17.
In this embodiment, the permanent magnet piston 12, the first fixed permanent magnet 6 and the second fixed permanent magnet 16 are made of magnetic materials, all the other parts are made of non-magnetic materials, and the strength of the negative stiffness can be adjusted by changing the magnets of different grades.
Further, the interior of the cylinder 8 is used for placing the viscous liquid 9, the viscous liquid 9 in the cylinder 8 is a core energy consumption part of the invention, when external vibration is transmitted to the structure, the structure drives the permanent magnet piston 12 to generate motion, the viscous liquid 9 is extruded to pass through a gap between the permanent magnet piston 12 and the cylinder 8, and simultaneously damping force is generated and mechanical energy is converted into heat energy, so that the vibration of the structure is reduced.
Meanwhile, the liquid inlet assembly 10 and the liquid outlet assembly 14 are arranged on the cylinder barrel 8, so that viscous liquid 9 can be conveniently added and discharged, and other kinds of viscous liquid 9 can be replaced, so that the damping adjusting effect is achieved.
Based on the assembled magnetic negative stiffness viscous damper, an expansion structure can be arranged, the piston cylinder assembly formed by two fixed permanent magnets and a cylinder barrel is assembled in sequence during the expansion structure, and corresponding permanent magnet pistons are additionally arranged on the piston rod according to the number of the piston cylinder assemblies.
For example, referring to fig. 4, the damper in fig. 5 may be formed by sequentially assembling two piston cylinder assemblies, and after assembling, two cylinder barrels, two permanent magnet pistons, and three fixed permanent magnets are provided, so that the damper in fig. 5 may provide greater magnetic force and negative stiffness than the damper in fig. 1, and may also achieve greater damping force, thereby achieving a better damping effect.
The number of the piston cylinder assemblies assembled in the scheme is not limited, and the damping force can be conveniently adjusted according to actual conditions.
The following illustrates the working process of the present solution in specific applications, where the following description is only a specific application example of the present solution, and is not meant to limit the present solution.
The port center of the hollow part of the cylinder 8 is positioned on the same axis, the second end of the piston rod 2 can sequentially pass through the first magnet cavity 5, the first fixed permanent magnet 6 and the cylinder 8, and the permanent magnet piston 12 at the second end of the piston rod 2 is arranged inside the cylinder 8 and positioned between the first fixed permanent magnet 6 and the second fixed permanent magnet 16.
A piston sealing ring 7 is arranged between the first fixed permanent magnet 6 and the cylinder 8, the piston sealing ring 7 is a hollow cylinder and is placed at the opening at one side of the cylinder 8 and at the position where the piston rod 2 passes through the cylinder 8, so that viscous liquid 9 can be prevented from leaking out of the cylinder, the friction coefficient between the viscous liquid and the piston rod 2 is low, and the movement of the piston rod 2 is not influenced.
After the assembly is completed, the first fixed permanent magnet 6 and the second fixed permanent magnet 16 are positioned at two sides of the permanent magnet piston 12 arranged in the cylinder 8, and the first fixed permanent magnet 6, the permanent magnet piston 12 and the second fixed permanent magnet 16 are sequentially and oppositely arranged, and two adjacent magnets are arranged in a suction mode according to opposite directions, so that the resultant force of attraction force born by the permanent magnet piston 12 is the same as the displacement direction, and a negative stiffness effect is generated.
Specifically, when the permanent magnet piston 12 is positioned between the first fixed permanent magnet 6 and the second fixed permanent magnet 16, the resultant force of the magnetic attraction force applied thereto is zero, and thus, is in the equilibrium position corresponding to the origin in fig. 5.
When the permanent magnet piston 12 approaches the first fixed permanent magnet 6 or the second fixed permanent magnet 16 due to the influence of external vibration of the piston rod 2, the attraction force of the fixed permanent magnet at the approaching end is rapidly increased, the attraction force of the fixed permanent magnet at the far end is rapidly reduced, and finally the attraction force resultant force of the permanent magnet piston 12 is in a nonlinear increasing trend along with the increase of displacement, which corresponds to the force-displacement curve of the second or fourth quadrant in fig. 5.
From hooke's law, it is known that the direction of the restoring force is the same as the direction of displacement, and a negative stiffness is produced. For example, referring to fig. 5, u is the displacement of the permanent magnet piston 12 along the longitudinal direction of the piston rod 2, and F is the restoring force (attractive force) applied to the permanent magnet piston 12 in the rightward direction, and is the positive direction opposite to the displacement u. When the permanent magnet piston 12 approaches the second fixed permanent magnet 16, u is positive and F is negative, and when the permanent magnet piston 12 approaches the first fixed permanent magnet 6, u is negative and F is positive.
The permanent magnet piston 12 moves faster under the action of the magnetic attraction force of the first fixed permanent magnet 6 and the second fixed permanent magnet 16, and the damping force generated by the assembled magnetic negative stiffness viscous damper is obviously larger than that of a conventional viscous damper according to the characteristic that the damping force of the viscous damper is in direct proportion to the speed.
At the same time, when the permanent magnet piston 12 moves, the viscous liquid 9 is pressed to pass through the gap between the permanent magnet piston 12 and the cylinder 8, and simultaneously, a damping force is generated and mechanical energy is converted into heat energy, thereby reducing structural vibration.
Finally, the permanent magnet piston 12 is returned to the original position after the movement is finished by means of a spring to reset itself.
The assembled magnetic negative stiffness viscous damper formed by the scheme firstly arranges the permanent magnet piston 12 between the first fixed permanent magnet 6 and the second fixed permanent magnet 16, and the magnetic poles of the adjacent magnets are arranged according to opposite attraction, so that the resultant force of attraction force born by the permanent magnet piston 12 is the same as the displacement direction, thereby generating a negative stiffness effect, reducing the total stiffness of the structure and increasing the structural period.
Secondly, the invention utilizes the characteristics of the viscous damper, namely, the viscous liquid 9 generates damping force from the gap between the piston 12 and the cylinder 8 and converts vibration energy into heat energy, thereby achieving the purpose of reducing the structural vibration response. Further, the permanent magnet piston 12 moves at a higher speed under the action of magnetic attraction, so that the viscous liquid 9 is promoted to generate a larger damping force, and a better energy consumption effect is realized.
At the same time, the invention uses the elastic component to reset the permanent magnet piston 12 automatically after the movement is finished.
Finally, this scheme compact structure, economical and environment-friendly, use in a flexible way, all assemble through the screw thread between every part simultaneously and connect, easy to maintain and change.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The assembled magnetic negative stiffness viscous damper is characterized by comprising a piston rod, a permanent magnet piston, an elastic assembly, a first fixed permanent magnet, a second fixed permanent magnet and a cylinder; the first fixed permanent magnet and the second fixed permanent magnet are arranged at two ends of the cylinder barrel to form a piston barrel assembly, the permanent magnet piston is arranged at one end of the piston rod and penetrates through the piston barrel assembly to be arranged in the cylinder barrel, and the permanent magnet piston moves between the first fixed permanent magnet and the second fixed permanent magnet under the driving of the piston rod; the magnets of adjacent magnets are oppositely arranged according to opposite attraction between the first fixed permanent magnet, the permanent magnet piston and the second fixed permanent magnet, so that the resultant force of attraction born by the permanent magnet piston is the same as the displacement direction, and a negative stiffness effect is generated;
the interior of the cylinder barrel is provided with viscous liquid, and the viscous liquid passes through a gap between the permanent magnet piston and the cylinder barrel in the motion process of the permanent magnet piston so as to generate damping force and convert vibration energy into heat energy;
the elastic component is positioned between the piston rod and the first fixed permanent magnet, and the piston rod is automatically reset under the action force generated by the movement of the piston rod.
2. The assembled magnetic negative stiffness viscous damper according to claim 1, wherein the first fixed permanent magnet is assembled with one end of the cylinder by providing a first magnet cavity.
3. The assembled magnetic negative stiffness viscous damper according to claim 2, wherein the first magnet cavity, the first fixed magnet and one end of the cylinder are provided with perforations for the piston rod to pass through, and the perforations of the first magnet cavity, the first fixed magnet and the cylinder are on the same axis.
4. The assembled magnetic negative stiffness viscous damper of claim 1, wherein a piston seal is disposed between the first stationary permanent magnet and the cylinder.
5. The assembled magnetic negative stiffness viscous damper according to claim 1, wherein the second fixed permanent magnet is assembled and connected with the other end of the cylinder by providing a second magnet cavity.
6. The assembled magnetic negative stiffness viscous damper according to claim 1, wherein the cylinder is provided with a liquid inlet assembly and a liquid outlet assembly, respectively.
7. The assembled magnetic negative stiffness viscous damper according to claim 1, wherein the permanent magnet piston is provided with a permanent magnet piston protective sleeve on the outer portion thereof and is fixed by being matched with a fixing piece.
8. The assembled magnetic negative stiffness viscous damper according to claim 2, wherein the elastic component comprises a spring connecting plate and a spring, the spring connecting plate is sleeved on the piston rod, and the spring is sleeved on the piston rod, and two ends of the spring are respectively abutted with the spring connecting plate and the first magnet cavity.
9. The assembled magnetic negative stiffness viscous damper according to claim 1, further comprising an earring assembly comprising a first earring and a second earring, the first earring being cooperatively coupled with the piston rod, the second earring being cooperatively coupled with the second magnet bore to form an integral structure.
10. The assembled magnetic negative stiffness viscous damper according to any one of claims 1, further comprising an expansion structure formed by assembling the piston-cylinder assemblies of claim 1 in sequence; and corresponding permanent magnet pistons are additionally arranged on the piston rods according to the number of the piston cylinder assemblies.
CN202310292721.3A 2023-03-23 2023-03-23 Assembled magnetic negative stiffness viscous damper Pending CN116292729A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310292721.3A CN116292729A (en) 2023-03-23 2023-03-23 Assembled magnetic negative stiffness viscous damper

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Application Number Priority Date Filing Date Title
CN202310292721.3A CN116292729A (en) 2023-03-23 2023-03-23 Assembled magnetic negative stiffness viscous damper

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CN116292729A true CN116292729A (en) 2023-06-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117905188A (en) * 2024-03-19 2024-04-19 四川中震智控科技有限公司 Viscous damper with adjustable rigidity

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117905188A (en) * 2024-03-19 2024-04-19 四川中震智控科技有限公司 Viscous damper with adjustable rigidity

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