CN108252200A - 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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- CN108252200A CN108252200A CN201810095331.6A CN201810095331A CN108252200A CN 108252200 A CN108252200 A CN 108252200A CN 201810095331 A CN201810095331 A CN 201810095331A CN 108252200 A CN108252200 A CN 108252200A
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- driven gear
- straight line
- suspension cable
- permanent
- conductor disc
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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 motion, 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 motion, 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 is relatively fixed with each driven gear, and each driven gear passes through bearing and rigid axis connection；Permanent magnet is set in the disk of fixed disk.The present invention makees cutting magnetic line movement using conductor disc in permanent magnet field 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, energy consumption power can be adjusted, it is adaptable to external loads, damper is made to be chronically at suitable load operating status.
Description
Technical field
The invention belongs to bridge structure vibration control field, more particularly, to a kind of suspension cable permanent magnetism of variable power
Formula eddy current damper.
Background technology
With being constantly progressive for cable-stayed bridge building technology, span gradually increases, the suspension cable as main load-carrying member
Draw ratio increases therewith, and rigidity, damping constantly reduce, and easily likes generating in wind, wind and rain, earthquake and the dynamic excitations such as vehicle-mounted
It substantially vibrates, and then causes the fatigue damage of staying cable anchorage zone and the discomfort and sense of insecurity of pedestrian.Therefore it needs
Effective control is made to Inclined Cable Vibration.
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 is two kinds of materials of different nature with rubber, and surface texture and mechanical property have
The difference of essence, therefore, it is difficult to ensure adhesive effect excellent between the two, also there are ageing of rubber for rubber absorbers in addition
The problem of.And eddy current damper is because its sensitivity is higher, maintenance requirement is low, and service life is long and the performance of 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 targe is single, damper easily occurs when wind load is excessively high
The situation of overload.Therefore it is a kind of adaptable to external loads in engineering field urgent need, energy consumption power can be adjusted, is chronically at
The suitable eddy current damper for carrying operating status.
Eddy-current damping technology is converted into the mechanical energy of object of which movement according to the law of electromagnetic induction electric energy in conductor disc,
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
Movement, and when causing the magnetic flux in conductor disc to change, current vortex will be generated in conductor disc.By Lenz's theorem it is found that
Current vortex can generate one and hinder conductor disc and the power of 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, so as to generate damping
Effect.By law of conservation of energy it is found that because the thermal energy that current vortex is dissipated is equal with the kinetic energy that conductor disc is lost.
Invention content
For the disadvantages described above or Improvement requirement 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, can adjust energy consumption power.
To achieve these goals, the present invention provides a kind of suspension cable permanent-magnet type eddy current damper of variable power,
Including：Telescopic rod, connecting rod, supporting rod, damping generate unit；
Telescopic rod includes first straight line motion 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 supporting rod；
Connecting rod one end is articulated on flexible club shaft, and the other end is for vertically connected suspension cable；
Damping generates unit and includes stiff shaft, second straight line motion, fixed disk, conductor disc, driving gear, at least three
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 motion；
During work, first straight line motion and second straight line motion are adjusted according to wind speed so that driving gear with
The driven gear engagement of different radii, and then change conductor disk rotating speed, so as to change current vortex power；Wherein,
When wind speed is larger, driving gear is engaged with the smaller driven gear of radius；When wind speed is smaller, driving gear and radius
Larger driven gear engagement.
Further, each driven gear is sequentially increased according to the descending sequence of radius with the distance of fixed disk.
Further, first straight line motion and second straight line motion are linear stepping motor；Damping generates
Unit further includes controller and power changeover program module；Controller connects first straight line motion 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 motion and second straight line motion is controlled, and then make
Driving gear is engaged with the driven gear that the wind speed of reception or typing matches, so as 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 being engaged with big driven gear, the gap between permanent magnet and conductor disc is 0.9mm.
Further, disk circumferential direction of the fixed disk close to conductor disc side is 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 on fixed disk towards in the disk of conductor disc, and is arranged in conductor disc outer shroud.
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：
1st, 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 shaking for dissipation suspension cable
Energy, so as to effectively be controlled the vibration of suspension cable；Also, there is provided different radii driven gear, for
It is matched respectively with driving gear under different wind speed, it is adaptable to external loads, energy consumption power can be adjusted, makes damper long
Phase is in suitable and carries operating status；
2nd, since smaller driven gear drives the angular speed of conductor disc spins larger, the fixed disk of distance and permanent magnet compared with
Closely, magnetic induction intensity is also relatively strong, therefore damping force is also larger, and larger driven gear is then on the contrary；When wind speed increases, make actively
Gear is matched with the adaptable smaller driven gear of radius, thus while larger damping force is provided, and can effectively control
Heat release processed.
3rd, 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 is sufficiently small.But under common load, do not need to be so big
Energy consumption power, thus larger driven gear can be switched to.The fatigue loss of material, extending structure can be reduced by doing so
Durability, while different grades of energy consumption power can be provided again, wind load adaptivity is strong.
4th, 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 ensures master
The magnetic resistance of magnetic circuit is as small as possible, while provides enough heat-dissipating spaces；
5th, according to the difference of connecting rod mounting means on suspension cable, if connecting rod is installs in face, the present invention can
To inhibit in plane vibration, if connecting rod is installs outside face, the present invention can inhibit out-of-plane vibration.
Description of the drawings
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 reference numeral is used for representing identical element or structure, wherein：1- bottom plates, 2- branch
Seat, 3- telescopic rods, 4- connecting rods, 5- supporting rods, 6- suspension cables, 7- dampings generate unit, 71- first straight line motions, 72-
Driving gear, 73- stiff shafts, the small driven gears of 74-, driven gear in 75-, the big driven gears of 76-, 77- conductor discs, 78- are solid
Price fixing, 79- second straight line motions, 700- permanent magnets, 8- cord clips.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is 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
It does not constitute a conflict with each other and 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, bearing 2, telescopic rod 3, connecting rod 4, supporting rod 5, damping generates unit 7 and cord clip 8, the bearing 2 are fixedly installed on bottom plate
1 top, the telescopic rod 3 is hinged with support column 5, and the cord clip 8 is fixed positioned at the top of connecting rod 4.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 firm
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 bearing, and second straight line motion 79
73 end of stiff shaft is fixedly installed on, can control stiff shaft 73 axially displaced.First straight line is disposed in 3 other end of telescopic rod
Motion 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；
The damped coefficient that one conductor disc rotates generation in the magnetic field of fixed disk side is：
T-rotary damping torque, ω-rotational angular velocity, the electrical conductivity of σ-conductor disc, the thickness of d-conductor disc,
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, one side of the disk 78 in close conductor disc is fixed, is arranged circumferentially multiple grooves, each groove is embedded in
One permanent magnet 700, and in any two adjacent grooves permanent magnet 700 magnetic pole on the contrary, (as shown in Figure 3), to ensure 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；When big driven gear 76 consumes energy, the gap 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 ensure main magnetic circuit magnetic resistance as far as possible
It is small, and the heat-dissipating space to provide conductor material.In addition, permanent magnet 700 has ferromagnetism, so as to ensure that the magnetic induction in magnetic field is strong
Spend B.Permanent magnet 700 on the fixed disk 78 is set 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 internal diameterThe radius of driving gear 72 is more than the half of big driven gear 76
Diameter, the radius of big driven gear 76 are more than the radius of middle driven gear 75 again, and the radius of middle driven gear 75 is again more than small driven
The radius of gear 74, so as 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.
It is as follows to generate the specific method damped for the suspension cable permanent-magnet type eddy current damper of variable power in the present embodiment：
The top of the connecting rod 4 is equipped with cord clip 6, and the connecting rod 4 is vertically connected at suspension cable 6 by cord clip 6, and
The bottom plate 1 and supporting rod 5 are fixed on bridge floor (as shown in Figure 4).When in plane vibration occurs for suspension cable 6, connecting rod 4 drives
Engagement rotation occurs for driving gear 72 and driven gear 74, one of 75,76, and driven gear 74,75, one of 76 drives conductor disc
77 make cutting magnetic line movement, so as to generate eddy-current damping with the vibrational energy for the suspension cable 6 that dissipates.
In the present embodiment, first straight line motion and second straight line motion are linear stepping motor, are used
The wind speed that person can quarterly forecast adjusts linear stepping motor manually 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.
Difference lies in carry out damping control using automatic adjustment mode for the second embodiment of the present invention and first embodiment
System.In a second embodiment, damping generates unit and further includes controller and power changeover program module；Controller connection first
Straight-line motion mechanism and second straight line motion；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 motion and the
Two straight-line motion mechanisms stretch, and then the driven gear that driving gear is made to match with the wind speed of reception or typing engages, from
And match suitable operating power.
Since the present invention is using gear cooperation, the strong of drag-line caused by linear stepping motor can either bear wind-force shakes
It is dynamic, while registration when under judder remaining to keep stretching motion, 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, so as to be effectively conducted the vibration of drag-line and conductor disc
The damping force received improves power conduction efficiency.
In other embodiments.First straight line motion and second straight line motion can also be bolted
Rigid telescopic casing, this construction can only be by adjusting stroke manually.
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, all any modification, equivalent and improvement made all within the spirits and principles of the present invention etc., 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, which is characterized in that including：Telescopic rod, connecting rod, branch
Strut, damping generate unit；
Telescopic rod includes first straight line motion 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 supporting rod；
Connecting rod one end is articulated on flexible club shaft, and the other end is for vertically connected suspension cable；
Damping generates unit and includes stiff shaft, second straight line motion, 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 motion,
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 motion；
During work, first straight line motion and second straight line motion are adjusted according to wind speed so that driving gear from it is different
The driven gear engagement of radius, and then change conductor disk rotating speed, so as to change current vortex power；Wherein,
When wind speed is larger, driving gear is engaged with the smaller 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
Moving gear is sequentially increased according to the descending sequence of radius with the distance of 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 motion and second straight line motion are linear stepping motor；Damping generate unit further include controller with
And power changeover program module；Controller connects first straight line motion and second straight line motion；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 motion and second straight line motion, so make driving gear with receive or
The driven gear engagement that the wind speed of typing matches, so as 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. the suspension cable permanent-magnet type eddy current damper of a kind of variable power as claimed in claim 4, which is characterized in that work as driving tooth
When wheel is engaged with small driven gear, the gap between permanent magnet and conductor disc is 0.3mm；When driving gear and middle driven gear are nibbled
During conjunction, the gap between permanent magnet and conductor disc is 0.6mm；When driving gear is engaged with big driven gear, permanent magnet is with leading
Gap between body 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.
A kind of 7. 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 on fixed disk towards in the disk of conductor disc, and is arranged in conductor disc outer shroud.
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 true CN108252200A (en) | 2018-07-06 |
| CN108252200B 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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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195755A (en) * | 2019-05-16 | 2019-09-03 | 南京理工大学 | A kind of adaptive damping permanent magnetism eddy current damper |
| CN111981082A (en) * | 2020-08-24 | 2020-11-24 | 湖南大学 | Damper vibration reduction system for inhibiting vertical vibration of bridge girder |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11172618A (en) * | 1997-12-10 | 1999-06-29 | Kajima Corp | Diagonal member cable damper of cable stayed bridge |
| CN102277831A (en) * | 2011-05-13 | 2011-12-14 | 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 |
-
2018
- 2018-01-31 CN CN201810095331.6A patent/CN108252200B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11172618A (en) * | 1997-12-10 | 1999-06-29 | Kajima Corp | Diagonal member cable damper of cable stayed bridge |
| CN102277831A (en) * | 2011-05-13 | 2011-12-14 | 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195755A (en) * | 2019-05-16 | 2019-09-03 | 南京理工大学 | A kind of adaptive damping permanent magnetism eddy current damper |
| CN111981082A (en) * | 2020-08-24 | 2020-11-24 | 湖南大学 | Damper vibration reduction system for inhibiting vertical vibration of bridge girder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108252200B (en) | 2019-08-09 |
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