CN113789879B - Pulley type tuned mass eddy current damper - Google Patents
Pulley type tuned mass eddy current damper Download PDFInfo
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- CN113789879B CN113789879B CN202111042758.8A CN202111042758A CN113789879B CN 113789879 B CN113789879 B CN 113789879B CN 202111042758 A CN202111042758 A CN 202111042758A CN 113789879 B CN113789879 B CN 113789879B
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- pulley
- eddy current
- spring
- current damper
- tuned mass
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- 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
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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
- E04H9/0215—Bearing, supporting or connecting constructions specially adapted for such buildings involving active or passive dynamic mass damping systems
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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
Abstract
The invention relates to an eddy current damper, in particular to a pulley type tuned mass eddy current damper which is characterized by comprising a mass block, wherein the mass block is connected with a spring assembly through a pulley block by a pull rope, the pulley block comprises a movable pulley, the spring assembly is fixedly connected below the movable pulley, the mass block is fixedly connected with a magnetic steel back plate and magnetic steel, and the mass block can drive the magnetic steel and a conductor plate to move mutually and generate eddy current. The invention provides a pulley type tuned mass eddy current damper, which is additionally provided with a pulley block, and the static extension of a spring is reduced by changing the corresponding relation between the static extension and the frequency by utilizing a movable pulley block. Therefore, the tuned mass eddy current damper can break through the limitation of the installation space, and the applicable frequency range of the tuned mass eddy current damper is expanded.
Description
Technical Field
The invention relates to an eddy current damper, in particular to a pulley type tuned mass eddy current damper.
Background
At present, the mainstream technology for inhibiting the vibration of the large engineering structure is still passive control with the highest reliability, and the main forms of the technology are Tuned Mass dampers (abbreviated as TMD) and various energy dissipation dampers. For vibration with specific frequency, better vibration damping effect can be achieved by adopting TMD.
TMD is mainly composed of mass unit, rigidity unit, damping unit, etc. it converts the structure vibration into the vibration of TMD mass block by tuning its own frequency to make it close to the structure frequency, and consumes energy by the damping unit, thus achieving the purpose of vibration damping.
However, vertical TMDs have a static elongation (i.e. the spring is deformed under its own weight), and the magnitude of the static elongation is related only to the TMD frequency, the lower the frequency, the greater the static elongation. For some low frequency vibrations, such as vortex-induced resonances that are prone to large span bridges, measures are usually taken to suppress the vertical TMDs, but the static elongation of these TMDs is often too long, e.g. the frequency is reduced from 0.5Hz to 0.1Hz, and the static elongation will increase from 1.0m to 24.8 m. And 0.1 Hz-0.5 Hz is the common vertical vortex vibration frequency range of the large-span bridge, and the frequency is even lower along with the breakthrough of the bridge span. However, the height of the internal space of the large-span bridge girder is not more than 9m, and many low-frequency TMDs cannot be installed. In order to solve the problem of excessive static elongation, some technical means are proposed, the working frequency of the TMD in tokyo gulf bridge in japan is 0.33Hz, the static elongation of the spring element reaches 2.27m, the length of the spring element is shortened to 0.45m after a lever mechanism is adopted, but the starting friction force of the lever mechanism is large. Chinese patent No. CN202010475626.3 proposes a "low frequency mass tuned damper", which uses a combination of multiple springs to achieve the purpose of reducing the static elongation of the spring, but the device is difficult to adjust the frequency and is prone to cause detuning of TMD damping. Chinese patent No. CN201710432627.8 proposes "a permanent-magnet ultralow frequency vertical tuned mass damper", which uses a flexible hinge to convert the vertical motion of the mass block into the high-speed rotation of the flywheel in order to solve the problem of the dead extension of the spring, but this method has a limited capability of reducing the dead extension of the spring.
Disclosure of Invention
The invention aims to: aiming at the problems in the prior art, the pulley type tuned mass eddy current damper is provided, and the corresponding relation between the static extension and the frequency of a spring is changed by utilizing a movable pulley block, so that the static extension of the spring is reduced, the size of equipment is reduced, and the applicable frequency range of the tuned mass eddy current damper is enlarged.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a harmonious mass eddy current damper of pulley type, includes the quality piece, the quality piece passes through the assembly pulley through the stay cord and connects spring assembly, the assembly pulley includes the movable pulley, the below fixed connection of movable pulley spring assembly, quality piece fixedly connected with magnet steel backplate and magnet steel, the quality piece can drive magnet steel and conductor plate take place the motion each other and produce the eddy current.
The calculation formula of the static elongation u of the spring is as follows:
in the formula, M is the self weight of TMD, g is the gravity acceleration, K is the spring stiffness, and f is the vibration frequency.
From the above equation, the static elongation of the spring is only related to the vibration frequency, and when the vibration frequency is reduced, the static elongation is correspondingly increased. When the vibration frequency is reduced to a certain degree, the static elongation of the spring is too long, and the field installation condition is not met any more.
In order to solve the problems, the invention introduces a pulley block, and if the amplification ratio of the pulley block is 1: n, the TMD vibration equation becomes:
in order to ensure that the vibration frequency is not changed, the rigidity of the spring needs to be adjusted to K 1 ＝n 2 K, so that the static elongation of the spring becomes:
by utilizing the corresponding relation, the static extension of TMD is changed into 1/n of the original static extension, the problem that the static extension of a spring of a low-frequency vibration structure is too long is solved, the limitation of installation space is broken through, and the application range of the tuned mass eddy current damper is expanded.
In a preferred embodiment of the present invention, the number of strands of the rope through which the movable pulley passes is greater than or equal to 2. By providing a plurality of movable pulleys, the static extension of the spring can be further reduced.
As a preferable scheme of the invention, the pulley block further comprises a fixed pulley, one end of the pull rope is fixed on the mass block, and the other end of the pull rope is fixed at a fixed point of the fixed pulley.
As a preferable scheme of the present invention, the number of the fixed pulleys is at least two, one of the fixed pulleys is used for fixing the pull rope, and the other fixed pulleys are used for connecting the mass block and the movable pulley.
As a preferable mode of the present invention, the number of the fixed pulleys is at least two.
The fixed pulley is fixed on the top of the bracket, and the spring is connected to the bottom of the bracket.
As a preferable aspect of the present invention, the bracket is fixedly connected with a magnetic back plate, and the conductor plate is fixedly connected with the magnetic back plate.
As a preferred scheme of the present invention, the bracket is connected to a magnetic conductive back plate through a fixing block, and the conductor plate is fixedly connected to the magnetic conductive back plate.
As a preferred scheme of the present invention, the magnetic conductive back plate is provided with a threaded hole, and the threaded hole is used for adjusting a gap between the conductor plate and the magnetic steel, so as to achieve a purpose of adjusting damping.
As a preferred scheme of the invention, the magnetic steel is connected to the mass block through a magnetic steel back plate.
As a preferable scheme of the invention, the spring assembly comprises a spring pulling plate and a spring, and the spring is connected with the movable pulley through the spring pulling plate.
In a preferred embodiment of the present invention, the pull cord is a steel wire rope.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention provides a pulley type tuned mass eddy current damper, which is additionally provided with a pulley block, and the static extension of a spring is reduced by changing the corresponding relation between the static extension and the frequency by utilizing a movable pulley block. Therefore, the tuned mass eddy current damper can break through the limitation of the installation space, and the applicable frequency range of the tuned mass eddy current damper is expanded.
2. The invention has simple and durable structure and obvious buffering effect; no working fluid exists, and the problem of liquid leakage cannot occur; the device is free from contact and abrasion, and has no friction damping; the magnetic field power supply is not needed, and the energy-saving and environment-friendly effects are achieved.
Drawings
Fig. 1 is a schematic three-dimensional structure diagram of a pulley type tuned mass eddy current damper according to the present invention.
Figure 2 is a front view of a pulley tuned mass eddy current damper according to the present invention.
Figure 3 is a side view of a pulley tuned mass eddy current damper according to the present invention.
Fig. 4 is a schematic structural view of the pulley block of the present invention.
Fig. 5 is a schematic structural diagram of an eddy current damping unit according to the present invention.
Fig. 6 is a schematic view of the mounting of the magnetic steel on the mass block (hiding the magnetic steel dust cover).
Icon: 1-spring pulling plate, 2-spring, 3-spring hook, 4-movable pulley, 5-rope hanging fixed pulley, 6-fixed pulley, 7-pulling rope, 8-mass block, 9-magnetic conductive back plate, 10-magnetic steel, 11-magnetic steel dust cover, 12-conductor plate, 13-top plate, 14-bottom plate, 15-vertical supporting rod, 16-transverse supporting rod, 17-fixed block, 18-bolt and 19-nut.
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
As shown in fig. 1-5, a pulley type tuned mass eddy current damper mainly comprises a spring assembly, a pulley assembly, a mass block assembly, an eddy current damping unit and a support, wherein the spring assembly comprises a spring pull plate 1 for connecting a movable pulley 4 and a spring 2, an extension spring 2 and a spring hook 3. The pulley assembly consists of a movable pulley 4, a rope hanging fixed pulley 5, a common fixed pulley 6 and a pull rope 7. The mass block assembly is formed by stacking a plurality of masses 8. The eddy current damping unit is composed of a magnetic conduction back plate 9, magnetic steel 10, a magnetic steel dust cover 11 and a conductor plate 12. The support consists of a top plate 13, a bottom plate 14, a vertical supporting rod 15, a transverse supporting rod 16 and a fixing block 17.
Wherein, the vertical support bar 15 is connected with the top plate 13 and the bottom plate 14 to form a stable support system. The magnetic conduction back plates 9 are fixedly connected to the bottom plate 14 through fixing blocks 17, the two magnetic conduction back plates 9 are arranged at intervals, and the two magnetic conduction back plates 9 are connected through a transverse supporting rod 16. Each magnetic conduction back plate 9 is fixedly connected with a conductor plate 12, the two conductor plates 12 are oppositely arranged, and the mass block 8 is arranged between the two conductor plates 12. The non-threaded through hole on the magnetic conduction back plate 9 is used for being connected with a fixed block 17 through a bolt, the threaded through hole is used for adjusting the gap between the conductor plate 12 and the magnetic field, the magnetic conduction back plate 9 is jacked up by a bolt 18, and the position is fixed by a nut 19, so that the aim of adjusting the damping is achieved.
Hang rope fixed pulley 5 and ordinary fixed pulley 6 fixed connection in roof 13, the vertical setting of spring 2, spring 2's lower extreme passes through spring hanger 3 and bottom plate 14 fixed connection, spring 2's upper end is through spring arm-tie 1 and movable pulley 4 fixed connection, the one end and the quality piece 8 fixed connection of stay cord 7, ordinary fixed pulley 6 is passed in proper order to the other end of stay cord 7, hang rope fixed pulley 5, twice again walk around movable pulley 4, finally fixed to the end of hanging rope fixed pulley 5. When the environment vibrates, the mass block 8 resonates, and the mass block 8 moves linearly on the vertical support rod 15 through the linear bearing, so that the extension spring 2 is driven to provide rigidity immediately, and the system keeps the resonant frequency. Meanwhile, as shown in fig. 6, a magnetic steel back plate is fixedly mounted on the side surface of the mass block 8, the magnetic steel back plate is fixedly connected with magnetic steel 10, a magnetic steel dust cover 11 is covered on the surface of the magnetic steel 10, when the mass block 8 moves, the magnetic steel 10 is driven to move relative to the conductor plate 12, the conductor plate 12 and the magnetic steel 10 generate a fixed magnetic field to move mutually, an eddy current is generated and interacts with the original magnetic field, a force for hindering the relative movement of the conductor plate 12 and the magnetic field is generated, a vibration reduction effect is generated, and meanwhile, the eddy current effect generates heat, namely, the mechanical energy of environmental vibration is dissipated in a heat energy mode.
As shown in fig. 4, the pulling rope 7 has one end fixed to the mass block 2 and the other end fixed to the rope-fixing pulley 5. By winding, the driven pulley 4 pays out 4 steel wire ropes, 4 is a multiple of the whole frequency reduction, and the frequency on which the spring assembly is designed can be designed by the frequency before reduction, so that the technical parameters of the rigidity required by the extension spring 2 are obtained. In the present embodiment, the rope 7 is a wire rope.
That is, the present embodiment introduces a pulley block, and the amplification ratio of the pulley block is 1: 4, then the TMD vibration equation becomes:
in order to ensure that the vibration frequency is not changed, the rigidity of the spring needs to be adjusted to K 1 ＝4 2 K, so that the static elongation of the spring 2 becomes:
namely, the net elongation of the spring 2 becomes 1/4, thereby solving the problem of overlong static elongation of the spring under the low-frequency structure. Of course, if a 2-way wire rope is paid out from the driven pulley 4, the net elongation of the spring 2 becomes 1/2.
As shown in fig. 1, the bracket is provided with a plurality of pull ropes 7, a plurality of springs 2 and pulley blocks, wherein the springs 2 are arranged on the left side and the right side of the bracket, so as to ensure that the mass block 8 can stably move up and down. And most structures of whole attenuator all adopt detachable connection structure to can carry out quick adaptability adjustment according to the vibration demand of difference, for example, adjust the height, the length of bracing piece, size, the parameter etc. of adjustment spring.
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 (9)
1. The utility model provides a harmonious mass eddy current damper of pulley type, its characterized in that, includes the quality piece, the quality piece passes through the assembly pulley and connects spring assembly, the assembly pulley includes the movable pulley, the below fixed connection of movable pulley spring assembly, quality piece fixedly connected with magnet steel backplate and magnet steel, the quality piece can drive magnet steel and conductor plate take place the motion each other and produce the eddy current, the assembly pulley still includes the fixed pulley, stay cord one end is fixed in the quality piece, the other end is fixed in the fixed point.
2. The pulley tuned mass eddy current damper according to claim 1, wherein the number of strands of the pull rope through which the movable pulley passes is greater than or equal to 2.
3. The tuned mass eddy current damper according to claim 1, wherein the number of the fixed pulleys is at least two, one of the fixed pulleys is used for fixing the pull rope, and the other fixed pulleys are used for connecting the mass block and the movable pulley.
4. The pulley-type tuned mass eddy current damper according to claim 1, further comprising a bracket, wherein said fixed pulley is fixed to the top of said bracket, and wherein said spring is connected to the bottom of said bracket.
5. The pulley type tuned mass eddy current damper according to claim 4, wherein said support is connected to a magnetically conductive back plate via a fixing block, and said conductor plate is fixedly connected to said magnetically conductive back plate.
6. The pulley-type tuned mass eddy current damper according to claim 5, wherein said magnetically conductive back plate is provided with a threaded hole for adjusting the gap between said conductor plate and said magnetic steel.
7. The pulley type tuned mass eddy current damper according to any one of claims 1-6, wherein said magnetic steel is connected to said mass via a magnetic steel back plate.
8. The pulley type tuned mass eddy current damper according to any one of claims 1-6, wherein said spring assembly comprises a spring pulling plate and a spring, said spring being connected to said movable pulley by means of the spring pulling plate.
9. The pulley tuned mass eddy current damper according to any one of claims 1 to 6, wherein said pull cord is a steel wire rope.
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| CN202111042758.8A CN113789879B (en) | 2021-09-07 | 2021-09-07 | Pulley type tuned mass eddy current damper |
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| CN202111042758.8A CN113789879B (en) | 2021-09-07 | 2021-09-07 | Pulley type tuned mass eddy current damper |
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| CN113789879B true CN113789879B (en) | 2022-09-16 |
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