CN113863119B - Electric eddy current tuned mass damper - Google Patents

Electric eddy current tuned mass damper Download PDF

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Publication number
CN113863119B
CN113863119B CN202111111419.0A CN202111111419A CN113863119B CN 113863119 B CN113863119 B CN 113863119B CN 202111111419 A CN202111111419 A CN 202111111419A CN 113863119 B CN113863119 B CN 113863119B
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China
Prior art keywords
spring
eddy current
gravity
connecting rope
mass block
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CN202111111419.0A
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CN113863119A (en
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王小帅
陈谨林
张弘毅
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Hunan Xiaozhen Engineering Technology Co ltd
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Hunan Xiaozhen Engineering Technology Co ltd
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00—Structural or constructional details of bridges
    • 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
    • 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
    • E04H9/0215—Bearing, supporting or connecting constructions specially adapted for such buildings involving active or passive dynamic mass damping systems
    • 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)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

The invention relates to the field of dampers, in particular to an eddy current tuned mass damper, which comprises a mass block, a magnetic member, a damping plate and a first spring, wherein the mass block is connected with the top of a structure to be damped through the first spring; the mass block is further connected with a gravity balancing device, the gravity balancing device is installed at the top of the structure to be damped, and the gravity balancing device is used for balancing the gravity of the mass block. According to the invention, the gravity balancing device is arranged to balance the gravity of the mass block, so that the gravity of the mass block acting on the first spring can be counteracted, and the first spring is prevented from generating unrecoverable deformation due to the action of the gravity of the mass block after a period of use. Therefore, the eddy current tuned mass damper provided by the invention can be suitable for buildings with smaller vertical installation space, such as bridges and the like.

Description

Electric eddy current tuned mass damper
Technical Field
The invention relates to a damper, in particular to an eddy current tuned mass damper.
Background
A damper is a device that uses damping characteristics to damp mechanical vibrations and consume kinetic energy. The damper mainly comprises a liquid damper, a gas damper and an electromagnetic damper. The damper is widely applied to the industries of aerospace, aviation, war industry, guns, automobiles and the like after development. The traditional buffer devices are generally of a mechanical type and a hydraulic type, and the principles of the two buffer devices are special devices for converting contact type mechanical friction into heat energy to prolong the action time of an impact load and absorb and convert the energy of the impact load. However, the mechanical friction damper has the characteristics of large starting friction force, oil leakage phenomenon of the liquid damper and long service life due to the eddy current technology.
All adopt the spring coupling quality piece among the harmonious mass damper of present eddy current, the spring mounting is at the top of treating shock-absorbing structure, is provided with the magnet steel on the quality piece, installs the damping plate in the bottom of treating shock-absorbing structure, treating shock-absorbing structure at the in-process of vibration, relative motion between magnet steel and the damping plate, generate the eddy current on the damping plate and become heat energy to turn into the energy consumption of vibration, reach the shock attenuation effect. In the sensor that adopts at present, the quantity of spring is all one to avoid increasing rigidity, lead to the frequency increase of attenuator, influence the shock attenuation effect. Meanwhile, as only one spring is arranged in the damper, the spring can be gradually deformed and extended under the action of the gravity of the mass block along with the increase of the service life of the damper. Some building bridges have low vertical installation space, and the existing eddy current tuned mass damper is not suitable for the structure with the flat installation space.
Disclosure of Invention
The invention aims to: aiming at the problems that in the prior art, a spring in the eddy current tuned mass damper can extend along with the increase of service time and is not suitable for buildings with smaller vertical installation space, such as bridges and the like, the eddy current tuned mass damper is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
an eddy current tuned mass damper comprises a mass block, a magnetic member, a damping plate and a first spring, wherein the mass block is connected with the top of a structure to be damped through the first spring, the damping plate is installed at the bottom of the structure to be damped, the magnetic member is installed on the mass block, and when the magnetic member moves up and down, eddy current can be generated in the damping plate; the mass block is further connected with a gravity balancing device, the gravity balancing device is installed at the top of the structure to be damped, and the gravity balancing device is used for balancing the gravity of the mass block.
First spring is connected with the quality piece, and the magnetic member who sets up on the quality piece when treating shock-absorbing structure vibration appearance, relative motion appears between magnetic member on the quality piece and the damping plate, produces the vortex in the damping plate and generates heat to energy conversion with the vibration is the heat energy consumption, can consume the energy of vibration, thereby plays absorbing effect. Through the gravity of setting up the gravity balancing unit balanced quality piece, can offset the gravity of quality piece effect on first spring, avoid after the use of a period, first spring produces unrecoverable deformation because of the effect of quality piece gravity. Adopt the harmonious mass damper of eddy current that above-mentioned technical scheme provided, the length of first spring can not increase because of the increase of harmonious mass damper live time of eddy current, consequently, can be applicable to the less building of vertical installation space such as bridge. And the rigidity of the eddy current tuned mass damper cannot be increased by adopting a gravity balancing device, and the damping effect of the damper cannot be influenced.
As a preferable scheme of the present invention, the gravity balance device includes a fixed frame, the fixed frame is installed on the top of the structure to be damped, the fixed frame is provided with a horizontal rotating shaft and a baffle, the rotating shaft is provided with a conical winding portion and a cylindrical winding portion, the conical winding portion is wound with a first connecting rope, one end of the first connecting rope is fixed on the end of the conical winding portion with the larger diameter, and the other end of the first connecting rope is connected with the mass block;
a second connecting rope is wound on the cylindrical winding part, one end of the second connecting rope is wound on the cylindrical winding part, the other end of the second connecting rope penetrates through the baffle plate and then is connected with a cover plate, a second spring is further arranged on the outer side of the second connecting rope and is positioned between the baffle plate and the cover plate, and the cover plate can press the second spring on the baffle plate; the first connecting rope and the second connecting rope are wound in opposite directions.
The quality piece exerts the torque through first connecting rope to the pivot, press the second spring on the baffle through the apron, the apron is connected with the second connecting rope, consequently, the second spring also can exert effect and epaxial torque in commentaries on classics, because the winding opposite direction of first connecting rope and second connecting rope, through the apex angle of control toper wire winding portion, the winding orbit of first connecting rope, the diameter of cylindrical wire winding portion and the elastic coefficient of second spring, just can realize that the torque that the in-process pivot received rises and descends at the quality piece offsets each other, promptly at the quality piece in-process that rises and descend, gravity balancing unit homoenergetic provides the power that equals with quality piece gravity.
In a preferred embodiment of the present invention, a sleeve is disposed on a side of the baffle facing the second spring, and the second spring is located in the sleeve.
As a preferable aspect of the present invention, the number of the gravity balance means is at least two.
The weight of the mass block is shared by the at least two gravity balance devices, so that the stress of the mass block is more uniform, and the up-and-down motion process is more stable.
As a preferable aspect of the present invention, the magnetic member is located on a side surface of the mass.
The magnetic member is arranged on the side face of the mass block, the distance between the magnetic member and the damping plate is smaller, heat generated by eddy current in the damping plate can be increased, and the damping effect of the eddy current tuned mass damper is better.
As a preferable aspect of the present invention, a groove is provided on a surface of the tapered winding portion, and the first connection cord is located in the groove.
Through setting up the recess at toper wire winding portion, first connecting rope is located the recess, can make first connecting rope along the orbit winding of recess to guarantee that the quality piece is when rising and descending, connect the torque that the rope was used in the pivot by a connecting rope and second and offset each other.
In a preferred embodiment of the present invention, the damping plate is a metal member.
In a preferred embodiment of the present invention, the magnetic member is magnetic steel.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the gravity balancing device is arranged to balance the gravity of the mass block, so that the gravity of the mass block acting on the first spring is counteracted, and the first spring is prevented from generating unrecoverable deformation due to the action of the gravity of the mass block after a period of use. Adopt the harmonious mass damper of eddy current that above-mentioned technical scheme provided, the length of first spring can not increase because of the increase of harmonious mass damper live time of eddy current, consequently, can be applicable to the less building of vertical installation space such as bridge. And extra rigidity can not be introduced on the basis of the existing eddy current tuned mass damper, and the damping effect of the eddy current tuned mass damper is ensured.
Drawings
FIG. 1 is a schematic structural view of the eddy current tuned mass damper of the present invention;
fig. 2 is a schematic structural view of the gravity balance device of the present invention.
An icon: 1-a mass block; 2-a magnetic member; 3-a damping plate; 4-a first spring; 5-a gravity balancing device; 51-a fixed mount; 52-a rotating shaft; 53-baffles; 531-sleeve; 54-a conical winding portion; 541-a groove; 55-a cylindrical winding portion; 56-first connecting rope; 57-a second connecting rope; 58-a second spring; 59-a cover plate; 6-the top of the structure to be damped; 7-the bottom of the structure to be damped.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
An eddy current tuned mass damper comprises a mass 1, a magnetic member 2, a first spring 4, a gravity balance device 5 and a damping plate 3. As shown in fig. 1, a mass block 1 is connected to a top 6 of a structure to be damped through a first spring 4, a gravity balance device 5 fixed to the top of the structure to be damped is connected to the mass block 1, in order to balance the force of the mass block 1, the number of the gravity balance devices 5 is at least two, and in this embodiment, four gravity balance devices 5 are adopted to share the gravity of the mass block 1; the mass block 1 is further provided with a magnetic member 2, and the magnetic member 2 is positioned on the side surface of the mass block 1. The damping plate 3 is mounted on the bottom 7 of the structure to be damped, facing the side on which the magnetic member 2 is mounted with respect to the mass 1. When the structure to be damped vibrates, the mass block 1 moves up and down, and the magnetic member 2 can enable the damping plates 3 positioned on two sides of the mass block 1 to generate eddy currents to generate heat, so that the vibration of the structure to be damped is converted into heat energy, the energy of the vibration is consumed, and the damping effect is achieved; the magnetic member 2 may be magnetic steel or other magnetic objects, and the damping plate 3 may be a metal member such as a copper plate or an aluminum plate.
The mass balancing device comprises a fixing frame 51, the fixing frame 51 is fixed on the top 6 of the structure to be damped, as shown in fig. 2, a horizontal rotating shaft 52 is arranged on the fixing frame 51, the rotating shaft 52 is provided with a conical winding portion 54 and a cylindrical winding portion 55, the conical winding portion 54 is conical, a first connecting rope 56 is wound on the conical winding portion 54, one end of the first connecting rope 56 is fixed at the end of the conical winding portion 54 with the larger diameter, and the other end of the first connecting rope 56 is connected with the mass block 1. The cylindrical winding part 55 is wound with a second connection string 57, and the winding direction of the second connection string 57 is opposite to the winding direction of the first connection string 56. The fixed frame 51 is further provided with a baffle 53, and the baffle 53 is positioned below the rotating shaft 52. One end of the second connecting rope 57 is fixed on the rotating shaft 52, the other end of the second connecting rope 57 penetrates through the baffle 53 and then is connected with a cover plate 59, a second spring 58 is further arranged between the cover plate 59 and the baffle 53, and the second connecting rope 57 can drive the cover plate 59 to press the second spring 58 on the baffle 53 in the winding process.
By controlling the vertex angle of the conical winding portion 54, the diameter of the cylindrical winding portion 55 and the elastic coefficient of the second spring 58, it can be ensured that the torques applied to the rotating shaft 52 by the first connecting rope 56 and the second connecting rope 57 can be mutually offset in the process of ascending or descending the mass block 1, that is, the sum of the pulling forces of the gravity balance device 5 acting on the mass block 1 is equal to the gravity of the mass block 1 in the process of ascending or descending the mass block 1. A groove 541 can be formed in the surface of the tapered winding portion 54, and the first connection cord 56 is wound in the groove 541, so as to ensure that the first connection cord 56 can be wound on the surface of the tapered winding portion 54 along the groove 541 in the process of ascending and descending the mass block 1, and ensure that the torque applied to the rotating shaft 52 by the first connection cord 56 and the torque applied to the rotating shaft 52 by the second connection cord 57 can be offset with each other.
In order to make the process of compressing the second spring 58 more smooth, a sleeve 531 may be provided on the shutter 53 such that the second spring 58 and the cover plate 59 both move within the sleeve 531, and the inner diameter of the sleeve 531 is adapted to the diameter of the second spring 58. Of course, the gravity balance device 5 in this embodiment may also be an existing constant tension device, such as the one disclosed in chinese patent, publication No. CN 102903283A.
The working principle of the eddy current tuned mass damper in the embodiment is as follows:
when the structure to be damped vibrates, the mass block 1 moves up and down relative to the structure to be damped. Taking the downward movement of the mass 1 as an example, the rotating shaft 52 rotates, so that more parts of the second connecting string 57 are wound around the cylindrical winding portion, the second spring 58 is compressed, and the torque applied to the rotating shaft 52 by the second connecting string 57 increases. Meanwhile, when the rotation shaft 52 rotates, the first connecting cord 56 is gradually separated from the conical winding portion 54, that is, the point of application of the force of the first connecting cord 56 to the rotation shaft 52 is gradually moved from the top of the conical winding portion 54 to the bottom of the conical winding portion 54, and the torque of the first connecting cord 56 to the rotation shaft 52 is also increased.
According to the formula:
F 1 ×R 1 ＝kΔx×R 2
wherein, F 1 Is the tension of the first connecting rope 56 on the mass block 1; r 1 Is the radius, R, of the force application point of the first connecting cord 56 on the conical winding portion 54 1 In relation to the apex angle of the conical winding portion 54, the winding locus of the first connecting string 56, and the height of descent of the mass 1; k is the elastic coefficient of the second spring 58; Δ x is the length variation of the second spring 58, which is related to the height of the mass 1 descending; r 2 Is the radius of the cylindrical winding portion 55. During the descent of the mass 1, R 1 And gradually increases, Δ x also gradually increases.
It can be seen that the tensile force F provided by the first connection cord 56 to the mass 1 during the ascending and descending of the mass 1 can be achieved by controlling the vertex angle of the conical winding portion 54, the winding track of the first connection cord 56, the diameter of the cylindrical winding portion 55 and the elastic coefficient of the second spring 58 1 All equal to the gravity borne by the mass block 1.
Since the gravity balance device 5 is capable of providing a tensile force equal to the gravitational force to which the mass 1 is subjected, the force causing the mass 1 to descend comes from the vibration of the structure to be damped. Through set up magnetic member 2 in quality piece 1 side, when quality piece 1 up-and-down motion, damping plate 3 and magnetic member 2 appear relative motion, and damping plate 3 cuts the magnetic induction line that magnetic member 2 produced to produce the vortex in damping plate 3, the kinetic energy of quality piece 1 converts into heat energy, consumes the energy of vibration, plays the absorbing effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (7)

1. An eddy current tuned mass damper comprises a mass block (1), a magnetic member (2), a damping plate (3) and a first spring (4), wherein the mass block (1) is connected with the top of a structure to be damped through the first spring (4), the damping plate (3) is installed at the bottom of the structure to be damped, the magnetic member (2) is installed on the mass block (1), and when the magnetic member (2) moves up and down, eddy current can be generated in the damping plate (3); the damping device is characterized in that the mass block (1) is further connected with a gravity balancing device (5), the gravity balancing device (5) is installed at the top of a structure to be damped, and the gravity balancing device (5) is used for balancing the gravity of the mass block (1);
the gravity balancing device (5) comprises a fixed frame (51), the fixed frame (51) is installed at the top of a structure to be damped, the fixed frame (51) is provided with a horizontal rotating shaft (52) and a baffle (53), the rotating shaft (52) is provided with a conical winding part (54) and a cylindrical winding part (55), the conical winding part (54) is wound with a first connecting rope (56), one end of the first connecting rope (56) is fixed at the end, with the larger diameter, of the conical winding part (54), and the other end of the first connecting rope (56) is connected with the mass block (1);
a second connecting rope (57) is wound on the cylindrical winding part (55), one end of the second connecting rope (57) is wound on the cylindrical winding part (55), the other end of the second connecting rope (57) penetrates through the baffle plate (53) and then is connected with a cover plate (59), a second spring (58) is further arranged on the outer side of the second connecting rope (57), the second spring (58) is located between the baffle plate (53) and the cover plate (59), and the cover plate (59) can press the second spring (58) on the baffle plate (53); the first connecting rope (56) and the second connecting rope (57) are wound in opposite directions.
2. An eddy current tuned mass damper according to claim 1, characterized in that the side of the baffle (53) facing the second spring (58) is provided with a sleeve (531), the second spring (58) being located inside the sleeve (531).
3. An eddy current tuned mass damper according to claim 1, characterized in that the surface of the conical winding (54) is provided with a groove (541), the first connection cord (56) being located in the groove (541).
4. An eddy current tuned mass damper according to claim 1, characterized in that the number of said gravity balancing means (5) is at least two.
5. An eddy current tuned mass damper according to claim 1, characterized in that the magnetic member (2) is located at the side of the mass (1).
6. An eddy current tuned mass damper according to claim 1, characterized in that the damping plate (3) is a metal component.
7. An eddy current tuned mass damper according to claim 1, characterized in that the magnetic member (2) is magnetic steel.
CN202111111419.0A 2021-09-18 2021-09-18 Electric eddy current tuned mass damper Active CN113863119B (en)

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Application Number Priority Date Filing Date Title
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CN113863119B true CN113863119B (en) 2023-02-24

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205639427U (en) * 2016-03-17 2016-10-12 同济大学 Harmonious mass damper of suspension type two freedoms current vortex
CN106760016A (en) * 2016-12-30 2017-05-31 同济大学 A kind of eddy current tuned damping unit of inertia
JP2019157947A (en) * 2018-03-09 2019-09-19 株式会社免制震ディバイス Mass damper
CN212053292U (en) * 2019-12-17 2020-12-01 上海建顾减震科技有限公司 Eddy current particle damper
CN112128286A (en) * 2020-09-14 2020-12-25 湖南大学 Vertical tuned mass ball screw type inertial capacitance eddy current damper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205639427U (en) * 2016-03-17 2016-10-12 同济大学 Harmonious mass damper of suspension type two freedoms current vortex
CN106760016A (en) * 2016-12-30 2017-05-31 同济大学 A kind of eddy current tuned damping unit of inertia
JP2019157947A (en) * 2018-03-09 2019-09-19 株式会社免制震ディバイス Mass damper
CN212053292U (en) * 2019-12-17 2020-12-01 上海建顾减震科技有限公司 Eddy current particle damper
CN112128286A (en) * 2020-09-14 2020-12-25 湖南大学 Vertical tuned mass ball screw type inertial capacitance eddy current damper

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