CN108252200B - A kind of suspension cable permanent-magnet type eddy current damper of variable power - Google Patents
A kind of suspension cable permanent-magnet type eddy current damper of variable power Download PDFInfo
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- CN108252200B CN108252200B CN201810095331.6A CN201810095331A CN108252200B CN 108252200 B CN108252200 B CN 108252200B CN 201810095331 A CN201810095331 A CN 201810095331A CN 108252200 B CN108252200 B CN 108252200B
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- driven gear
- straight line
- movement mechanism
- conductor disc
- line movement
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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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a kind of suspension cable permanent-magnet type eddy current dampers of variable power, belong to bridge structure vibration control field.The damper includes the permanent magnet of stiff shaft, second straight line movement mechanism, fixed disk, conductor disc, driving gear, the driven gear of at least three different radiis and at least a pair of of different magnetic poles；Stiff shaft one end connects second straight line movement mechanism, and the other end sequentially passes through fixed disk, conductor disc and each driven gear；Fixed disk is fixed relative to stiff shaft, and conductor disc and each driven gear are relatively fixed, and each driven gear passes through bearing and rigid axis connection；Permanent magnet is set in the disk of fixed disk.The present invention is made cutting magnetic line movement in permanent magnet field using conductor disc and generates eddy-current damping, with the vibrational energy of dissipation suspension cable, the vibration of suspension cable is inhibited, and pass through the driven gear of different radii and engaging for driving gear, adjustable energy consumption power, it is adaptable to external loads, so that damper is chronically at suitable load operating status.
Description
Technical field
The invention belongs to bridge structure vibration control fields, more particularly, to a kind of suspension cable permanent magnetism of variable power
Formula eddy current damper.
Background technique
With being constantly progressive for cable-stayed bridge building technology, span is gradually increased, the suspension cable as main load-carrying member
Draw ratio increases with it, and rigidity, damping constantly reduce, and easily generates under wind, wind and rain, earthquake and the dynamic excitations such as vehicle-mounted big
Width vibration, and then cause the fatigue damage of staying cable anchorage zone and the discomfort and sense of insecurity of pedestrian.Therefore needs pair
Inclined Cable Vibration makes effective control.
Currently used damper has frictional property damper, hydraulic damper, rubber absorbers and eddy current damper
Etc..Traditional frcition damper adaptive ability is poor, and energy dissipation capacity is low；Hydraulic damper is higher to sealing requirements, easily goes out
Existing oil leakage phenomenon；In rubber absorbers, metal and rubber are two kinds of materials of different nature, and surface texture and mechanical property have
Essence difference, therefore, it is difficult to guarantee adhesive effect excellent between the two, furthermore there is also ageing of rubber for rubber absorbers
The problem of.And eddy current damper is because its sensitivity is higher, maintenance requirement is low, and the performance of long service life and control vibration is excellent
More gain great popularity.Although traditional eddy current damper control device is simple, control parameter can not be adjusted after installation,
Therefore not strong to the adaptability of structural parameters and external loads, control target is single, easily occurs damper when wind load is excessively high
The case where overload.Therefore it is badly in need of that a kind of pair of external loads are adaptable, and adjustable energy consumption power is chronically in engineering field
The suitable eddy current damper for carrying operating status.
The mechanical energy of object of which movement is converted into the electric energy in conductor disc according to the law of electromagnetic induction by eddy-current damping technology,
Then pass through the electricresistance effect dissipation vibrational energy of conductor disc.Known by the law of electromagnetic induction, when conductor disc and magnetic field occur relatively
When moving, and the magnetic flux in conductor disc being caused to change, current vortex will be generated in conductor disc.By Lenz's theorem it is found that
Current vortex can generate the power for hindering conductor disc and magnetic field relative motion, that is, damping force with former magnetic field interaction.This
Outside, since the resistance of conductive plate is not zero, according to Ohm's law, current vortex will be dissipated in the form of thermal energy, to generate damping
Effect.By law of conservation of energy it is found that the thermal energy to be dissipated by current vortex is equal with the kinetic energy that conductor disc is lost.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of suspension cable permanent magnetism of variable power
Formula eddy current damper, its object is to adaptable to external loads, adjustable energy consumption power.
To achieve the goals above, the present invention provides a kind of suspension cable permanent-magnet type eddy current damper of variable power,
It include: telescopic rod, connecting rod, support rod, damping generation unit；
Telescopic rod includes first straight line movement mechanism and the body of rod；Body of rod one end connects first straight line telecontrol equipment, and the body of rod is another
One end is articulated on support rod；
Connecting rod one end is articulated on flexible club shaft, and the other end is for vertically connected suspension cable；
It includes stiff shaft, second straight line movement mechanism, fixed disk, conductor disc, driving gear, at least three that damping, which generates unit,
The permanent magnet of the driven gear of a different radii and at least a pair of of different magnetic poles；Stiff shaft one end connects second straight line fitness machine
Structure, the other end sequentially pass through fixed disk, conductor disc and each driven gear；Fixed disk is fixed relative to stiff shaft, conductor disc with
Each driven gear is relatively fixed, and each driven gear passes through bearing and rigid axis connection；Permanent magnet is set in the disk of fixed disk；
Driving gear connects first straight line movement mechanism；
When work, first straight line movement mechanism and second straight line movement mechanism are adjusted according to wind speed so that driving gear with
The driven gear of different radii engages, and then changes conductor disk rotating speed, to change current vortex power；Wherein,
When wind speed is larger, driving gear is engaged with the lesser driven gear of radius；When wind speed is smaller, driving gear and radius
Biggish driven gear engagement.
Further, each driven gear sequence descending according to radius, is sequentially increased at a distance from fixed disk.
Further, first straight line movement mechanism and second straight line movement mechanism are linear stepping motor；Damping generates
Unit further includes controller and power changeover program module；Controller connects first straight line movement mechanism and second straight line movement
Mechanism；Power changeover program module is implemented function such as when being called by controller: according to receive or the current of typing, the same day,
When week, of that month or when season wind speed, the flexible of first straight line movement mechanism and second straight line movement mechanism is controlled, and then make
Driving gear is engaged with the driven gear that the wind speed of reception or typing matches, to match suitable operating power.
Further, driven gear includes large, medium and small three kinds of radiuses.
Further, when driving gear is engaged with small driven gear, the gap between permanent magnet and conductor disc is
0.3mm；When driving gear is engaged with middle driven gear, the gap between permanent magnet and conductor disc is 0.6mm；Work as driving gear
When engaging with big driven gear, the gap between permanent magnet and conductor disc is 0.9mm.
Further, fixed disk close to conductor disc side disk circumferential direction be equipped with even number groove, and each groove center away from
The distance of conductor disk center is consistent；Permanent magnet is equipped in each groove, the magnetic pole of adjacent permanent magnets is opposite.
Further, permanent magnet is set to fixed disk towards in the disk of conductor disc, and is arranged in conductor disc outer ring.
Further, the material of conductor disc is copper, aluminium or albronze.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial to effect
Fruit:
1, when Inclined Cable Vibration, connecting rod drive one of driving gear and driven gear occur engagement rotation, by from
Moving gear drives conductor disc to make cutting magnetic line movement in permanent magnet field and generates eddy-current damping, with the vibration of dissipation suspension cable
Energy, so that the vibration to suspension cable is effectively controlled；Also, it is provided with the driven gear of different radii, is used for
It is matched respectively with driving gear under different wind speed, adaptable to external loads, adjustable energy consumption power keeps damper long
Phase is in suitable and carries operating status；
2, since lesser driven gear drives the angular speed of conductor disc spins larger, apart from fixed disk and permanent magnet compared with
Closely, magnetic induction intensity is also relatively strong, therefore damping force is also larger, and biggish driven gear is then on the contrary；When wind speed increases, make actively
Gear is matched with the adaptable lesser driven gear of radius, thus while larger damping force is provided, and can effectively control
Heat release processed.
3, the load adaptive ability of device is realized by switching different size of driven gear, according to different wind
Size is carried, adaptable driven gear is switched to by controller and power changeover program module.In order to meet maximum wind load
It is required that effectiveness in vibration suppression is good enough, thus driven gear wants sufficiently small.But under common load, do not need so big
Energy consumption power, thus biggish driven gear can be switched to.Do so the fatigue loss that can reduce material, extending structure
Durability, while different grades of energy consumption power can be provided again, wind load adaptivity is strong.
4, when driving gear with it is small, in, big driven gear engage when, the gap between permanent magnet and conductor disc is respectively
0.3mm,0.6mm,0.9mm；On the one hand it avoids conductor disc and permanent magnet that frictional impact occurs at work, on the other hand guarantees master
The magnetic resistance of magnetic circuit is as small as possible, while providing enough heat-dissipating spaces；
5, according to connecting rod on suspension cable mounting means difference, if connecting rod be face in installation, the present invention can
To inhibit in plane vibration, if connecting rod is to install outside face, the present invention can inhibit out-of-plane vibration.
Detailed description of the invention
Fig. 1 is a kind of structure chart of the suspension cable permanent-magnet type eddy current damper of variable power of the present invention；
Fig. 2 is the structure chart that damping generates unit in Fig. 1；
Fig. 3 is the schematic diagram that multiple permanent magnets are located at one disk of fixed disk in Fig. 2；
Fig. 4 is that the suspension cable permanent-magnet type eddy current damper of variable power is installed on the schematic diagram of bridge floor.
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which: 1- bottom plate, 2- branch
Seat, 3- telescopic rod, 4- connecting rod, 5- support rod, 6- suspension cable, 7- damping generate unit, 71- first straight line movement mechanism, 72-
Driving gear, 73- stiff shaft, the small driven gear of 74-, driven gear in 75-, the big driven gear of 76-, 77- conductor disc, 78- are solid
Price fixing, 79- second straight line movement mechanism, 700- permanent magnet, 8- cord clip.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
As shown in Figure 1 and Figure 2, a kind of structure chart of the suspension cable permanent-magnet type eddy current damper of variable power includes bottom plate
1, support 2, telescopic rod 3, connecting rod 4, support rod 5, damping generates unit 7 and cord clip 8, the support 2 are fixedly installed on bottom plate
1 top, the telescopic rod 3 and support column 5 are hinged, the fixed top for being located at connecting rod 4 of the cord clip 8.The damping generates single
Member 7 includes driving gear 72 and driven gear 74,75,76；The driving gear 72 is fixedly installed on the end for tightening bar 3, and
It is engaged with one of the driven gear 74,75,76；Driven gear 74,75,76 is connect by bearing with stiff shaft 73.It is described rigid
The device for making cutting magnetic line movement is also arranged on property axis 73；The device for making cutting magnetic line movement is located at driven gear 74,
75,76 inside.
The device for making cutting magnetic line movement includes conductor disc 77, fixed disk 78, driven gear 74,75,76 and active
Gear 72.The stiff shaft 73 sequentially passes through fixed disk 78, conductor disc 77, big driven gear 76, middle driven gear 75, small driven
Gear 74；The fixed disk 78 is fixedly installed on stiff shaft 73, and the conductor disc 77 is fixedly installed on 76 on the inside of big driven gear,
And it is connect with stiff shaft 73 by bearing.73 end of stiff shaft is fixedly installed on 2 top of support, and second straight line movement mechanism 79
It is fixedly installed on 73 end of stiff shaft, can control stiff shaft 73 axially displaced.First straight line is disposed in 3 other end of telescopic rod
Movement mechanism 71 can control telescopic rod 3 axially retractable.So as to make driving gear 72 and driven gear 74,75,76 all
Change engagement.Fixed disk 78 is provided at least one permanent magnet 700, the permanent magnet 700 and conductor disc close to the side of conductor disc
Gap is equipped between 77；
One conductor disc rotates the damped coefficient of generation in the magnetic field of fixed disk side are as follows:
T-rotary damping torque, ω-rotational angular velocity, σ-conductor disc electrical conductivity, d-conductor disc thickness,
B-magnetic induction intensity, Ro- conductor disc magnetic field overlay area outer diameter, Ri- conductor disc magnetic field overlay area internal diameter.
In the present embodiment, fixed disk 78 is arranged circumferentially multiple grooves, each groove is embedded in the one side close to conductor disc
One permanent magnet 700, and in any two adjacent grooves permanent magnet 700 magnetic pole on the contrary, (as shown in Figure 3), to guarantee conductor
The change rate of magnetic density in rotation of disk 77 is sufficiently large；Gap between permanent magnet 700 and conductor disc 77 choose it is described it is small from
When moving gear 74 consumes energy, the gap between permanent magnet and conductor disc is 0.3mm；When driven gear 75 consumes energy in the middle, the permanent magnetism
Gap between iron and conductor disc is 0.6mm；Gap when the energy consumption of big driven gear 76, between the permanent magnet and conductor disc
For 0.9mm.This be in order to make material at work not with surrounding occur frictional impact, and guarantee main magnetic circuit magnetic resistance as far as possible
It is small, and to provide the heat-dissipating space of conductor material.In addition, permanent magnet 700 has ferromagnetism, to guarantee that the magnetic induction in magnetic field is strong
Spend B.Permanent magnet 700 in the fixed disk 78 is arranged at the edge of 77 one side of proximity conductor disk, is covered with increasing conductor disc magnetic field
The difference of 4 powers of cover area outer diameter and inner diameterThe radius of driving gear 72 is greater than the half of big driven gear 76
Diameter, the radius of big driven gear 76 are greater than the radius of middle driven gear 75 again, and the radius of middle driven gear 75 is greater than small driven again
The radius of gear 74, to increase the rotational angular velocity of conductor disc, and can free switching energy consumption power.According to economic factor and lead
Electrostrictive coefficient, the material of conductor disc can be copper, aluminium or albronze.
The specific method is as follows for the suspension cable permanent-magnet type eddy current damper generation damping of variable power in the present embodiment:
The top of the connecting rod 4 is equipped with cord clip 8, and the connecting rod 4 is vertically connected at suspension cable 6 by cord clip 8, and
The bottom plate 1 and support rod 5 are fixed on bridge floor (as shown in Figure 4).When in plane vibration occurs for suspension cable 6, connecting rod 4 is driven
Engagement rotation occurs for driving gear 72 and driven gear 74, one of 75,76, and one of driven gear 74,75,76 drives conductor disc
77 make cutting magnetic line movement, to generate eddy-current damping with the vibrational energy for the suspension cable 6 that dissipates.
In the present embodiment, first straight line movement mechanism and second straight line movement mechanism are linear stepping motor, are used
The wind speed that person can quarterly forecast manually adjusts linear stepping motor to erecting bed in advance, with change driving gear with it is driven
The cooperation of gear, quarterly once.According to local climate condition and wind speed luffing, can also per diem, week, the frequencies such as the moon are to scene
It is adjusted.
The difference of the second embodiment of the present invention and first embodiment is, carries out damping control using automatic adjustment mode
System.In a second embodiment, it further includes controller and power changeover program module that damping, which generates unit,；Controller connection first
Straight-line motion mechanism and second straight line movement mechanism；Power changeover program module is implemented function such as when being called by controller:
According to receive or the current of typing, the same day, when week, of that month or when season wind speed, control first straight line movement mechanism and the
Two straight-line motion mechanisms stretch, and then the driven gear for making driving gear match with the wind speed of reception or typing engages, from
And match suitable operating power.
Since the present invention is cooperated using gear, linear stepping motor can either bear the strong vibration of drag-line caused by wind-force
Registration when moving, while being still able to maintain stretching motion under judder, it is ensured that switching and course of work middle gear are accurately right
Position engagement.Also, linear stepping motor also has enough rigidity and intensity, to be effectively conducted the vibration and conductor disc of drag-line
The damping force received improves power conduction efficiency.
In other embodiments.First straight line movement mechanism and second straight line movement mechanism are also possible to be bolted
Rigid telescopic casing, this construction can only be by manually adjusting stroke.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of suspension cable permanent-magnet type eddy current damper of variable power characterized by comprising telescopic rod, connecting rod, branch
Strut, damping generate unit；
Telescopic rod includes first straight line movement mechanism and the body of rod；Body of rod one end connects first straight line telecontrol equipment, the body of rod other end
It is articulated on support rod；
Connecting rod one end is articulated on flexible club shaft, and the other end is for vertically connected suspension cable；
Damping generate unit include stiff shaft, second straight line movement mechanism, fixed disk, conductor disc, driving gear, at least three not
With the driven gear of radius and the permanent magnet of at least a pair of of different magnetic poles；Stiff shaft one end connects second straight line movement mechanism,
The other end sequentially passes through fixed disk, conductor disc and each driven gear；Fixed disk is fixed relative to stiff shaft, conductor disc with respectively from
Moving gear is relatively fixed, and each driven gear passes through bearing and rigid axis connection；Permanent magnet is set in the disk of fixed disk；
Driving gear connects first straight line movement mechanism；
When work, first straight line movement mechanism and second straight line movement mechanism are adjusted according to wind speed so that driving gear from it is different
The driven gear of radius engages, and then changes conductor disk rotating speed, to change current vortex power；Wherein,
When wind speed is larger, driving gear is engaged with the lesser driven gear of radius；When wind speed is smaller, driving gear is larger with radius
Driven gear engagement.
2. a kind of suspension cable permanent-magnet type eddy current damper of variable power as described in claim 1, which is characterized in that respectively from
The moving gear sequence descending according to radius, is sequentially increased at a distance from fixed disk.
3. a kind of suspension cable permanent-magnet type eddy current damper of variable power as claimed in claim 1 or 2, which is characterized in that
First straight line movement mechanism and second straight line movement mechanism are linear stepping motor；Damping generate unit further include controller with
And power changeover program module；Controller connects first straight line movement mechanism and second straight line movement mechanism；Power changeover program
Module is implemented function such as when being called by controller: according to reception or the current of typing, the same day, when week, of that month or this season
The wind speed of degree controls the flexible of first straight line movement mechanism and second straight line movement mechanism, so make driving gear and receive or
The driven gear engagement that the wind speed of typing matches, to match suitable operating power.
4. a kind of suspension cable permanent-magnet type eddy current damper of variable power as claimed in claim 1 or 2, which is characterized in that
Driven gear includes large, medium and small three kinds of radiuses.
5. a kind of suspension cable permanent-magnet type eddy current damper of variable power as claimed in claim 4, which is characterized in that when
When driving gear is engaged with small driven gear, the gap between permanent magnet and conductor disc is 0.3mm；When driving gear is driven in
When gear engages, the gap between permanent magnet and conductor disc is 0.6mm；When driving gear is engaged with big driven gear, permanent magnetism
Gap between iron and conductor disc is 0.9mm.
6. a kind of suspension cable permanent-magnet type eddy current damper of variable power as claimed in claim 1 or 2, which is characterized in that
Disk circumferential direction of the fixed disk close to conductor disc side is equipped with even number groove, and distance one of each groove center away from conductor disk center
It causes；Permanent magnet is equipped in each groove, the magnetic pole of adjacent permanent magnets is opposite.
7. a kind of suspension cable permanent-magnet type eddy current damper of variable power as claimed in claim 6, which is characterized in that permanent magnetism
Iron is set to fixed disk towards in the disk of conductor disc, and is arranged in conductor disc outer ring.
8. a kind of suspension cable permanent-magnet type eddy current damper of variable power as claimed in claim 1 or 2, which is characterized in that
The material of conductor disc is copper, aluminium or albronze.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810095331.6A CN108252200B (en) | 2018-01-31 | 2018-01-31 | A kind of suspension cable permanent-magnet type eddy current damper of variable power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810095331.6A CN108252200B (en) | 2018-01-31 | 2018-01-31 | A kind of suspension cable permanent-magnet type eddy current damper of variable power |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108252200A CN108252200A (en) | 2018-07-06 |
| CN108252200B true CN108252200B (en) | 2019-08-09 |
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ID=62743256
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810095331.6A Active CN108252200B (en) | 2018-01-31 | 2018-01-31 | A kind of suspension cable permanent-magnet type eddy current damper of variable power |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195755B (en) * | 2019-05-16 | 2020-10-20 | 南京理工大学 | Variable damping permanent magnet eddy current damper |
| CN111981082B (en) * | 2020-08-24 | 2021-08-24 | 湖南大学 | Damper vibration reduction system for inhibiting vertical vibration of bridge girder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3319369B2 (en) * | 1997-12-10 | 2002-08-26 | 鹿島建設株式会社 | Cable staying device for cable stayed cable |
| CN102277831B (en) * | 2011-05-13 | 2012-12-26 | 大连海事大学 | Stay cable structure for cable-stayed bridge |
| CN204676425U (en) * | 2015-05-21 | 2015-09-30 | 中国铁路总公司 | The eddy current damper that a kind of suspension cable out-of-plane vibration controls |
| CN206189252U (en) * | 2016-10-28 | 2017-05-24 | 河海大学 | Electromagnetic damper that tape spool held |
| CN206694483U (en) * | 2017-05-09 | 2017-12-01 | 大连理工大学 | A kind of big displacement eddy current damper |
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