CN107354867A - A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management - Google Patents
A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management Download PDFInfo
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- CN107354867A CN107354867A CN201710695650.6A CN201710695650A CN107354867A CN 107354867 A CN107354867 A CN 107354867A CN 201710695650 A CN201710695650 A CN 201710695650A CN 107354867 A CN107354867 A CN 107354867A
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- mass
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- copper coin
- magneto
- damping unit
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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
- E01D19/06—Arrangement, construction or bridging of expansion joints
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- Civil Engineering (AREA)
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- Vibration Prevention Devices (AREA)
Abstract
The invention discloses a kind of magneto tuning quality damping unit for bridge expanssion joint Disease management, including mass, it is distributed in outside and the permanent magnet covered with graphite ene coatings, inside and outside copper coin and some springs in mass.Inside and outside copper coin position is fixed, and mass hangs on the upper mounted plate of the device by spring, causes mass to swing during box beam horizontal vibration, magnetic induction line caused by permanent magnet on the inside of interior copper coin cut quality block；Cause mass vertical motion, the magnetic induction line of outer copper coin cutting outside permanent magnet during box beam vertical motion, vibrational energy is dissipated by the resistance fuel factor of copper coin.Present apparatus simple structure, it is easy for installation, overcome the shortcomings that traditional Effects of Viscous Fluid Damper oil leak, substantially prolongs the service life of damper, improve the damping effect of device；In addition, the damping unit can control simultaneously beam-ends level to vertical displacement, be greatly reduced because beam-ends corner and caused by expansion joint distortion destroy probability, control the generation and development of expansion joint disease.
Description
Technical field
Present invention relates particularly to a kind of magneto tuning quality damping unit for bridge expanssion joint Disease management.It is related to
Civil engineering vibration control technology field.
Background technology
Expansion joint is the important component of bridge structure, and it is bridge is made in temperature change, driving and wind etc. that it, which is acted on,
Freely stretched with lower without producing restraining force.Due to directly bearing Vehicle Load repeatedly, and it is chronically exposed in air,
Thus use environment is severe so that expansion joint turns into the most weak part of bridge structure, and service life is far smaller than design load, directly
Connecing causes substantial amounts of maintenance and renewal cost.
Shown according to U.S.'s statistics, the average life span of bridge expanssion joint is 10~15 years, far below bridge setting in itself
Count the life-span；Between 8 years that the eastern name highway of Japan is open to traffic, the average repairing number at expansion joint is 1.6 times/seam.As China is handed over
Logical transport undertaking is flourished, and bridge construction quantity and scale and the volume of traffic are continuously increased so that the damage feelings at expansion joint
Condition is more prominent.Shown according to the survey data of nineteen ninety, 13 cities such as Beijing's highway department, Tianjin bridge management institute
The bridge management department in city has investigated administrative 556, bridge, and wherein the bridge number of expansion gap device destroyed is 271, account for by
Investigate the 48.7% of bridge sum.Bridge expanssion joint not only directly influences traffic safety and road-ability once damaging, and
And the stress of superstructure is influenced whether, reduce the service life of bridge.
Expansion joint Slope protection is probed into, the destruction to early prevention and discovery expansion joint, extends expansion joint service life tool
It is of great significance.Research shows that the accumulation displacement of box beam is the main reason for expansion joint is destroyed, and temperature deformation only accounts for whole
The fraction of displacement body, and wind and vehicular load cause box beam slightly quickly to vibrate the fatigue rupture for causing support beam.Therefore,
It must take measures to reduce box beam vibration, viscous damper and tuning quality damping are mainly installed in existing measure inside box beam
Device (TMD) reduces the reaction of structure under vibration.Viscous damper reduces vibration by consuming vibrational energy, due in damper
Hydraulically full, interior rigidity is almost nil, therefore will not change original structure vibration frequency, and power is ellipse with displacement lagging curve
It is circular favourable to controlled structure, but the problem of oil leak be present and be not easy to conserve, so as to influence effectiveness in vibration suppression.TMD by mass,
Spring and damping system composition, drive system to vibrate together, system motion when main structure produces vibration under outer incentive action
Caused inertia force reacts on main structure tuning inertia force again, makes it in opposite direction with exciting force, so as to reduce main structure
Every response value, reach the purpose of control main structure vibration.Existing small-sized TMD damping elements are generally elastomeric material, large-scale TMD
Using oil damper, but there is the problem of ageing of rubber and oil leak and fatigue in two kinds of dampers.
Graphene has excellent electricity, calorifics and mechanical performance, almost may apply to every field and enjoys people
Concern.The preparation method of graphene was constantly modified in recent years, to produce the graphene of large area, low cost, high quality.
Premium properties based on graphene, it will likely turn into the core material of high speed transistor, high sensor and composite
Material.Graphene has very strong chemical inertness and stability, and service life is grown, and stability is good.Graphene is prepared on copper surface
Film, the corrosion resistance of copper can be improved, and increase conductive and thermal conductivity.
When in the magnetic field that non-magnetic conductor is in time-varying or during the cutting magnetic line movement in magnetic field, causing magnetic flux to be sent out
Changing, according to Faraday's electromagnetic induction law, induced electromotive force will be produced in conductor, so as to form the electricity of similar whirlpool
Stream, i.e. current vortex.According to eddy current principle, a series of eddy current dampers for field of civil engineering are have developed, such as
CN201010022003 permanent-magnet type eddy current tuned mass dampers, the damping of CN201310080464 pendulum-types eddy current tuned mass
Device device etc..
For the vulnerability at expansion joint, although generally using viscous damper vibration damping at present, to reducing expansion joint cross-bridges
To ineffective with vertical motion and still inevitable the problem of oil leak, ageing of rubber.Utilize the vibration absorber of eddy current principle
With without friction, be not in the outstanding advantages of leakage, but vibrated at present still without specifically for mitigation expansion joint all directions
Damping unit, therefore how effectively using eddy current principle mitigate expansion joint vibration be a class for getting a good eye value
Topic.
The content of the invention
Technical problem：To solve expansion joint caused by wind and vehicular load, slightly quickly vibration causes expansion joint to be sent out too early
Raw to destroy, the present invention provides a kind of magneto tuning quality damping unit for bridge expanssion joint Disease management, overcomes existing
The shortcomings that viscous damper, in the cleavable magnetic induction line of different directions, so that effectively mitigate the vibration of bridge expanssion joint all directions,
Be greatly reduced because beam-ends corner and caused by expansion joint distortion failure probability.
Technical scheme：A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management of the present invention
Upper mounted plate is connected with the top plate of box beam end, and bottom plate is connected with box beam bottom plate；Between upper mounted plate and bottom plate
Provided with mass, mass medial and lateral installation permanent magnet forms entirety with mass, and upper mounted plate is articulated with by spring II；
Interior copper coin in mass is connected by the spring III in steel sleeve with upper mounted plate, steel sleeve top and upper mounted plate
Bolt；Outer copper coin and magnetic conductor are located at the outside of mass, the upper and lower ends of outer copper coin and magnetic conductor respectively with upper mounted plate and
Bottom plate consolidates；Arc is located at the lower section of mass, and spring I is fixed on bottom plate in one end, and the other end is consolidated with arc
Knot.
The mass level changes horizontal vibration frequency, horizontal vibration to during motion by the pendulum length for adjusting spring II
Frequency calculation formula is：
In formula：G represents acceleration of gravity；
L represents spring II pendulum length.
During the mass vertical motion, the stiffness elements of magneto tuning quality damping unit are by spring II and spring I
There is provided, by adjusting spring II and spring I stiffness change vertical motion frequency, vertical motion frequency calculation formula is：
In formula：K represents spring II and spring I equivalent stiffness；
M represents the quality of mass.
Covered with graphite ene coatings outside the interior copper coin and outer copper coin.
Epoxy resin is scribbled outside the steel sleeve.
The permanent magnet is NdFeB material.
The ferromagnetic level of permanent magnetism of face is relative for N, S level up and down on the inside of mass for the permanent magnet, and with row's adjacent permanent magnet
Ferromagnetic level is opposite.
Increase permanent magnet outside the mass top plate, while in the bottom for setting up copper coin and being fixed on upper mounted plate.
The steel sleeve flushes place's perforate with mass top plate lower edge, and is welded in quality in a tapping short slab of limiting
Block top plate, spring III both ends are connected with spacing short slab and interior copper coin respectively.
Beneficial effect：The present invention forms permanent magnet and mass overall by the outside arrangement permanent magnet in mass,
And copper coin is installed inside and outside mass.When box beam occurred level to vibration when, cause mass to swing, interior side copper plate cut quality
Magnetic induction line caused by block interior permanent magnet；When box beam vertical motion, vertical displacement, outside copper coin cut quality occur for mass
Magnetic induction line caused by permanent magnet on the outside of block, from eddy current principle, vibrational energy is dissipated by the resistance fuel factor of copper coin.Separately
Outside, permanent magnet tuning quality damping unit simple installation of the invention is flexible, can by direction across bridge and along bridge to being respectively arranged, so as to
Control simultaneously direction across bridge with along displacement of the bridge to beam-ends, be greatly reduced because beam-ends corner and caused by expansion joint distortion destroy it is general
Rate, control the generation and development of expansion joint disease.
Brief description of the drawings
Fig. 1 is the structural representation of apparatus of the present invention；
Fig. 2 is the side cutaway view of apparatus of the present invention；
Fig. 3 is the mass top view of apparatus of the present invention；
Fig. 4 is I-I profiles in Fig. 3 of the present invention；
Fig. 5 is the steel bushing bar side view of apparatus of the present invention；
Fig. 6 is II-II profiles in Fig. 5 of the present invention；
Fig. 7 is the outer copper coin lateral arrangement figure of apparatus of the present invention；
Have in figure：1, mass；2, spring I；3, outer copper coin；4, interior copper coin；5, permanent magnet；6, spring II；7, spring
III；8, steel sleeve；9, upper mounted plate；10, box beam top plate；11, bottom plate；12, box beam bottom plate；13, arc；14, it is spacing
Short slab；15, magnetic conductor.
Embodiment
The upper mounted plate 9 of the damping unit is connected with the top plate 10 of box beam end, and bottom plate 11 connects with box beam bottom plate 12
Connect；Mass 1, the medial and lateral of mass 1 installation permanent magnet 5 and mass 1 are provided between upper mounted plate 9 and bottom plate 11
Entirety is formed, upper mounted plate 9 is articulated with by spring II6；Interior copper coin 4 in mass 1 passes through the spring in steel sleeve 8
III7 is connected with upper mounted plate 9, and the top of steel sleeve 8 bolts with upper mounted plate 9；Outer copper coin 3 and magnetic conductor 15 are located at mass 1
Outside, the upper and lower ends of outer copper coin 3 and magnetic conductor 15 consolidate with upper mounted plate 9 and bottom plate 11 respectively；Arc 13 is located at
The lower section of mass 1, spring I2 are fixed on one end bottom plate 11, and the other end consolidates with arc 13.
During to prevent mass vertical motion, interior copper coin is vertically being in contact with permanent magnet, in steel sleeve and mass top
Plate lower edge flushes place's perforate, and tapping sets Horizontal limiting short slab and is connected with spring.When downward displacement occurs for mass, quality
Block drives the spacing short slab of lower edge to move downwardly together, so that spring extends, interior copper coin occurs to bottom offset.Mass is vertical
During vibration, the stiffness elements of magneto tuning quality damping unit are provided by spring II and spring I, by adjusting spring II and bullet
Spring I stiffness change vertical motion frequency, vertical motion frequency calculation formula are：
In formula：K --- spring II and spring I equivalent stiffness；
M --- represent the quality of mass.
Pendulum-type TMD frequency formula：
In formula：G --- acceleration of gravity；
L --- represent spring II pendulum length.
From formula (2), pendulum-type TMD frequency is determined by pendulum length, therefore can make TMD frequencies by adjusting the length of spring
Rate reaches design load, and damper performance reaches optimal.
Covered with graphite ene coatings outside copper coin, with make full use of the good electric conductivity of grapheme material and thermal conductivity and
Corrosion resistance, scribbling epoxy resin outside steel sleeve prevents from corroding, and permanent magnet is NdFeB material, the material be current magnetic energy product most
Big material.
For the permanent magnet in arrangement, the top plate and base plate interior permanent magnet arranged opposite of mass, magnetic level are N, S level phase
It is right, and it is opposite with row's ferromagnetic level of adjacent permanent magnet when, magnetic induction intensity reaches maximum on copper coin, and scheme is optimal.
, can outside the mass top plate more to increase magnetic flux and cutting efficiency when concrete engineering is applied
Increase permanent magnet, while set up copper coin on mass top and be fixed on upper mounted plate.
When the load such as wind and vehicle causes the expansion joint to produce slightly quickly vibration, the mass in box beam will be put
Move, magnetic induction line caused by the permanent magnet inside interior copper coin cut quality block, the permanent magnet on the outside of outer copper coin cut quality block produces
Magnetic induction line, corresponding induced electromotive force is produced in inside and outside copper coin, so as to form current vortex.When conductor using speed is v uniform
Moved in the B of magnetic field, the current density for flowing through conductor is：
J=σ (v × B) (3)
Wherein, the conductance of σ --- conductor；B --- magnetic induction intensity；J --- electric eddy current density.
The electromagnetic force that conductor current is subject in magnetic field is：
Wherein, the volume of Γ --- conductor.
It was found from from formula (3) and (4), damping force is relevant with the volume of magnetic field and conductor cutting magnetic induction line.
Because conductor velocity attitude is vertical with magnetic induction intensity, then F size is：
F=- σ δ SB2v (5)
Wherein, the thickness of δ --- conductor；S --- conductive surface accumulates.
In formula (5), negative sign represents electromagnetic force with cutting magnetic induction line velocity attitude on the contrary, according to Lenz's law, current vortex production
The raw magnetic field opposite with magnetic field.During copper coin cutting magnetic induction line, it will form the damping force for preventing both relative motions, lead
Enable amount is consumed by the resistance fuel factor of copper coin, final to reduce expansion joint vibration.
As shown in figure 1, when mass 1 is swung, the vertical paper direction of swaying direction；As shown in Fig. 2 mass 1 is sent out
Unboiled water is put down to when swinging, and swaying direction is to be swung in face, and mass 1 sets sufficiently large sky in the interior swaying direction of copper coin 4
Between, prevent interior copper coin 4 from being collided with the inwall of mass 1.Length by adjusting spring II6 controls the swing week of mass 1
Phase, TMD frequencies are made to reach design load, damper performance reaches optimal.
Covered with graphite ene coatings outside interior copper coin 4 and outer copper coin 3, make full use of the good electric conductivity of grapheme material and
Thermal conductivity and corrosion resistance, scribbling epoxy resin outside steel sleeve 8 prevents from corroding, and permanent magnet 5 is NdFeB material, and the material is
The maximum material of magnetic energy product at present.Spring I2 one end consolidates with bottom plate 11 on bottom plate 11, and the other end is consolidated in arc
Plate 13, the bottom of mass 1 when static are arranged to 3~5mm with 13 vertical distance of arc.
As shown in figs. 34, the top plate of mass 1 and the arranged opposite of base plate interior permanent magnet 5, the magnetic of inner side face magnet
Level is relative for N, S level, and with row's magnetic level of adjacent permanent magnets 5 on the contrary, now caused magnetic induction is strong on interior copper coin 4 and outer copper coin 3
Degree is maximum, so that more energy are consumed by the resistance fuel factor of copper coin.Arrange quantity according to specific feelings with row's permanent magnet 5
Condition is arranged, but no less than two, can increase permanent magnet 5 outside the top plate of mass 1, while set up copper on the top of mass 1
Plate is fixed on upper mounted plate 9.
As shown in Fig. 5~7, during to prevent 1 vertical motion of mass, interior copper coin 4 is vertically being in contact with permanent magnet 5,
Steel sleeve 8 flushes place's perforate with the top plate lower edge of mass 1, and tapping is limited a short slab 14 and spring III7 phases in the horizontal direction
Even.When downward displacement occurs for mass 1, mass 1 drives the spacing short slab 14 of lower edge to move downwardly together, so that bullet
Spring III7 extends, and interior copper coin 4 occurs to bottom offset.During mass vertical motion, the rigidity of magneto tuning quality damping unit
Element is provided by spring II and spring I, by the stiffness equivalent vertical motion frequency for changing spring II and spring I.
The preferred embodiments of the present invention are the foregoing is only, the content according to disclosed in specification, those skilled in the art can
Embodiment is carried out suitably to change and improve.The invention is not limited in above-mentioned embodiment, changes and improves
It should be included in right, and term used herein is only for convenience of description, does not cause any restrictions to the present invention.
Claims (9)
1. a kind of magneto tuning quality damping unit for bridge expanssion joint Disease management, it is characterised in that the damping fills
The upper mounted plate (9) put is connected with the top plate (10) of box beam end, and bottom plate (11) is connected with box beam bottom plate (12)；Upper solid
Mass (1), mass (1) medial and lateral installation permanent magnet (5) and mass are provided between fixed board (9) and bottom plate (11)
(1) entirety is formed, upper mounted plate (9) is articulated with by spring II (6)；Interior copper coin (4) in mass (1) passes through steel bushing
Spring III (7) in pipe (8) is connected with upper mounted plate (9), is bolted at the top of steel sleeve (8) with upper mounted plate (9)；Outer copper coin (3)
Be located at the outside of mass (1) with magnetic conductor (15), the upper and lower ends of outer copper coin (3) and magnetic conductor (15) respectively with upper mounted plate
(9) and bottom plate (11) consolidates；Arc (13) is located at the lower section of mass (1), and lower fixation is fixed in spring I (2) one end
Plate (11), the other end consolidate with arc (13).
2. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, it is special
Sign is that the mass (1) is horizontal to during motion, and the pendulum length by adjusting spring II (6) changes horizontal vibration frequency, horizontal
Vibration frequency calculates formula：
<mrow>
<mi>f</mi>
<mo>=</mo>
<mn>2</mn>
<mi>&pi;</mi>
<msqrt>
<mfrac>
<mi>g</mi>
<mi>l</mi>
</mfrac>
</msqrt>
</mrow>
In formula：G represents acceleration of gravity；
L represents spring II pendulum length.
3. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, it is special
Sign is, during mass (1) vertical motion, the stiffness elements of magneto tuning quality damping unit by spring II (6) and
Spring I (2) is provided, by adjusting spring II (6) and spring I (2) stiffness change vertical motion frequency, vertical motion frequency meter
Calculating formula is：
<mrow>
<mi>f</mi>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mn>2</mn>
<mi>&pi;</mi>
</mrow>
</mfrac>
<msqrt>
<mfrac>
<mi>k</mi>
<mi>m</mi>
</mfrac>
</msqrt>
</mrow>
In formula：K represents spring II (6) and spring I (2) equivalent stiffness；
M represents the quality of mass (1).
4. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, it is special
Sign is that the interior copper coin (4) and outer copper coin (3) are outside covered with graphite ene coatings.
5. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, it is special
Sign is, epoxy resin is scribbled outside the steel sleeve (8).
6. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, it is special
Sign is that the permanent magnet (5) is NdFeB material.
7. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, it is special
Sign is that permanent magnet (5) magnetic level of face is relative for N, S level up and down on the inside of mass (1) for the permanent magnet (5), and with row
Adjacent permanent magnets (5) magnetic level is opposite.
8. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, it is special
Sign is, increases permanent magnet (5) outside mass (1) top plate, while be fixed under upper mounted plate (9) setting up copper coin
Portion.
9. the magneto tuning quality damping unit according to claim 1 for bridge expanssion joint Disease management, it is special
Sign is, the steel sleeve (8) flushes place's perforate with mass (1) top plate lower edge, and is limited a short slab (14) in the tapping
Mass top plate is welded in, spring III (7) both ends are connected with spacing short slab (14) and interior copper coin (4) respectively.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710695650.6A CN107354867B (en) | 2017-08-15 | 2017-08-15 | A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management |
| PCT/CN2018/084943 WO2019033789A1 (en) | 2017-08-15 | 2018-04-27 | Permanent magnet-based tuned mass damper device for deterioration control of bridge expansion joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710695650.6A CN107354867B (en) | 2017-08-15 | 2017-08-15 | A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107354867A true CN107354867A (en) | 2017-11-17 |
| CN107354867B CN107354867B (en) | 2019-04-30 |
Family
ID=60288420
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710695650.6A Active CN107354867B (en) | 2017-08-15 | 2017-08-15 | A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107354867B (en) |
| WO (1) | WO2019033789A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107964837A (en) * | 2017-12-06 | 2018-04-27 | 中建空列（北京）工程设计研究院有限公司 | Track joint connecting equipment and the track for including the track joint connecting equipment |
| CN108425986A (en) * | 2018-04-17 | 2018-08-21 | 中铁大桥科学研究院有限公司 | Drum type brake electric eddy-current damping device, damping adjusting method and bridge vibration-proof structure |
| WO2019033789A1 (en) * | 2017-08-15 | 2019-02-21 | 东南大学 | Permanent magnet-based tuned mass damper device for deterioration control of bridge expansion joint |
| CN110589816A (en) * | 2019-10-12 | 2019-12-20 | 福州扬清环保科技有限公司 | Magnetic suspension filter device of graphene based ultrasonic stripping method |
| CN112283285A (en) * | 2020-10-30 | 2021-01-29 | 湖南大学 | Horizontal tuning cantilever type eddy current damper |
| CN112524196A (en) * | 2020-11-18 | 2021-03-19 | 东南大学 | Eddy current energy dissipation and vibration reduction type bridge expansion joint device |
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| CN107354867B (en) * | 2017-08-15 | 2019-04-30 | 东南大学 | A kind of magneto tuning quality damping unit for bridge expanssion joint Disease management |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019033789A1 (en) * | 2017-08-15 | 2019-02-21 | 东南大学 | Permanent magnet-based tuned mass damper device for deterioration control of bridge expansion joint |
| CN107964837A (en) * | 2017-12-06 | 2018-04-27 | 中建空列（北京）工程设计研究院有限公司 | Track joint connecting equipment and the track for including the track joint connecting equipment |
| CN108425986A (en) * | 2018-04-17 | 2018-08-21 | 中铁大桥科学研究院有限公司 | Drum type brake electric eddy-current damping device, damping adjusting method and bridge vibration-proof structure |
| CN108425986B (en) * | 2018-04-17 | 2023-06-02 | 中铁大桥科学研究院有限公司 | Cylindrical eddy current damping device, damping adjustment method and bridge vibration reduction structure |
| CN110589816A (en) * | 2019-10-12 | 2019-12-20 | 福州扬清环保科技有限公司 | Magnetic suspension filter device of graphene based ultrasonic stripping method |
| CN110589816B (en) * | 2019-10-12 | 2022-08-30 | 陕西拓讯建筑工程有限公司 | Magnetic suspension filter device of graphene based ultrasonic stripping method |
| CN112283285A (en) * | 2020-10-30 | 2021-01-29 | 湖南大学 | Horizontal tuning cantilever type eddy current damper |
| CN112283285B (en) * | 2020-10-30 | 2021-07-20 | 湖南大学 | Horizontal tuning cantilever type eddy current damper |
| CN112524196A (en) * | 2020-11-18 | 2021-03-19 | 东南大学 | Eddy current energy dissipation and vibration reduction type bridge expansion joint device |
| CN112524196B (en) * | 2020-11-18 | 2021-09-28 | 东南大学 | Eddy current energy dissipation and vibration reduction type bridge expansion joint device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107354867B (en) | 2019-04-30 |
| WO2019033789A1 (en) | 2019-02-21 |
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