KR101873361B1 - Cable damper having magnetic-hydraulic damper of symmetric hydraulic line and spring damper, and method for controlling cable vibration using the same - Google Patents

Abstract

Provided are a cable damper having a magnetic-hydraulic damper of a symmetric hydraulic line and a spring damper, and a method of controlling cable vibration using the same, in which the cable vibration is primarily damped using a spring damper to damp vibration of cables in cable bridges such as cable-stayed bridges or suspension bridges, the cable vibration is secondarily damped by operating a symmetrically arranged magnetic-hydraulic damper as a hydraulic damper when the cable vibration exceeds the vibration damping capacity of the spring damper, and the cable vibration is tertiarily damped by operating the magnetic-hydraulic damper as an MR damper when the cable vibration exceeds the hydraulic damper damping capacity, so that the vibration of the cable is effectively damped. In addition, when a slight vibration occurs in the cable, the spring damper primarily damps the vibration without the operation of the magnetic-hydraulic damper, such that a lifespan of the magnetic-hydraulic damper extends.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line, and a cable vibration control method using the same. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable damper,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable damper, and more particularly, to a vibration damper for various types of vibration of a construction cable structure caused by a wind load or a vehicle load. The damper includes a magnetic damper, a spring damper, And a cable vibration control method using the cable damper.

In general, all structures (buildings, bridges, etc.), such as civil engineering and building structures, are subjected to external loads such as wind loads, seismic loads, vehicle loads, and walking loads, , There is an adverse effect on the structural stability and usability. As a method of reducing such vibration, a method of installing a vibration control device (vibration isolation device) on the outside or inside of the structure and absorbing the vibration has been studied.

In particular, cable structures such as wires and ropes tend to be more susceptible to vibration due to various causes such as wind loads and vehicle loads. This is mainly due to the low damping factor and high flexibility of the cable structure. In fact, various cable vibrations occur due to wind load and vehicle load in cable structures in construction fields such as cables of cable-stayed bridges and hanger cables of suspension bridges, Vibration has an adverse effect on the stability of the entire structure including the cable, such as fatigue failure.

When vibration occurs in the cable structure in the construction field, most of the viscous devices such as an oil damper are installed at the end of the cable or a viscoelastic device such as a high-damping rubber is installed at the end of the cable to suppress the vibration . However, these devices have the disadvantage of frequent maintenance.

In addition, the cable used for cable-stayed bridge or suspension bridge is a key member of a cable-stayed bridge or a suspension bridge that transfers various loads to a bridge by tension, and maintenance after construction is very important. However, the cables of cable-stayed bridge and suspension bridge are very flexible and can not suppress the deformation caused by external load. Also, since they have low damping ratio, they can not dissipate the vibration energy and are sensitive to the vibration caused by wind load and live load .

In such cables, vibration typically occurs due to wind and rain winds such as buffeting, vortex vibration, galloping, and wake galloping by pylon or adjacent cable, and such vibrations reduce the life of the cable-stayed bridge Therefore, a method of appropriately reducing such vibration is being developed. Up to now, the most effective method for controlling the vibration of a cable is known as a method of controlling the vibration of the cable using a cable damper.

For example, a vibration control method using a damping device, which is a cable damper, is a method of reducing a vibration generated in a cable by providing a damping device on the cable, and has been recently spotlighted because of its excellent vibration control performance. As such a damping device, a passive damping device such as a viscous damper, a viscoelastic damper, a friction damper, and a carbonaceous damper is used, and an external damper and an internal damper are distinguished according to the position of the damping device. This damping device is installed between each cable and the bridge top plate as shown in Figs. 1A and 1B.

FIGS. 1A and 1B are schematic views respectively showing a viscous device or a viscoelastic device mainly used when vibration occurs in a cable-stayed cable structure or a suspension cable structure of a suspension bridge according to a conventional technique.

1A and 1B, when vibration occurs in the cable 11 of the cable-stayed bridge 10 or the hanger cable 21 of the suspension bridge 20 according to the related art, the oil damper 12 A highly damped rubber 22 or the like as a viscoelastic device is provided at the end of each of the cables 11 and 21 to control the vibration using the viscosity of the oil damper 12 or the viscoelasticity of the highly damped rubber 22. However, such an oil damper 12 or the high-damping rubber 22 is very expensive and has a disadvantage of requiring periodic maintenance.

Damper using such a viscous fluid has a disadvantage that durability is deteriorated due to fluid deterioration and fluid leakage due to long use.

Dampers for solving the above-mentioned problems have been researched and developed in various forms. Recently, dampers using gallium-type semi-solid materials and dampers using characteristics of shape memory alloys have been studied and developed. For example, There is an MR (Magneto Rheological) damper for solving the disadvantage of a damper using a viscous fluid.

Such MR dampers have been used in conventional vibration control and mechanical structures. For example, MR dampers include vibration damping of suspension cables in cable-laden bridges, vibration damping of automotive seats and suspension devices, and vibration and / or mechanical vibration isolation devices. The MR material used in such an MR damper has a property of reversibly changing the rheological characteristic when a magnetic field is applied. Specifically, the MR material can change itself into a semi-solid with controlled and controllable yield stress within a thousandth of a second from a free flowing linear viscous fluid when exposed to an applied magnetic field. By applying different electric currents to the electromagnets of the MR damper, it is possible to control and control the magnetic field applied to the MR material so that the yield stress of the MR material and thus the yielding force and the flow damping of the MR damper can be controlled within one thousandth of a second Easy to adjust and control. However, such an MR damper is limitedly applied as a cable damper.

In the case of a cable damper according to the related art, it is necessary to develop a cable damper having an improved performance in order to apply it to a pole cable or the like.

Korean Patent No. 10-1649320 filed on December 26, 2008, entitled "MR fluid cable and its system" Korean Patent No. 10-1255350 filed on June 22, 2006, entitled " Magnetostrictive damper and its use " Korean Patent No. 10-867367 filed on April 6, 2006, entitled "Controllable ER / MR fluid damper" Korean Patent No. 10-1222912 filed on Dec. 10, 2010, entitled "Magneto-rheological fluid spring structure and suspension structure using the same" Korean Patent No. 10-741554 filed on July 18, 2006, entitled "Cable Damper Assembly" Korean Patent No. 2012-129580 (Publication date: November 28, 2012), title of invention: "MR damper"

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a vibration damping device for vibration damping a cable bridge such as a cable- The magnetic field hydraulic damper placed in the neutral position acts as a hydraulic damper to secondarily neutralize the vibration of the cable and when the vibration of the cable exceeds the hydraulic damping capacity of the hydraulic damper, the magnetic damper operates as an MR damper, , A cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line, and a cable vibration control method using the cable damper.

Another object of the present invention is to provide a magnetic damper and spring damper of a symmetrical hydraulic line capable of extending the service life of a magnetic field hydraulic damper by first damaging a spring damper without operation of a magnetic field hydraulic damper when small vibration is generated in a cable And a cable vibration control method using the cable damper.

As a means for achieving the above technical object, a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to the present invention is a cable damper of a cable bridge such as a cable-stayed bridge or a suspension bridge, A hexagonal collar disposed on the support frame and having an inner circumferential surface formed in a circular shape and an outer surface formed in a hexagonal shape so as to press the cable; A balance holding device disposed in close contact with each of the hexagonal outer surfaces of the hexagonal collar so as to maintain balance with the magnets of the magnetic field hydraulic damper; A magnetic field hydraulic damper which is arranged to be spaced apart from the balance holding device by a predetermined distance and which operates in pairs with opposing magnetic field hydraulic dampers; A hydraulic line extending from each of the magnetic field hydraulic dampers and connecting the symmetrically arranged magnetic field hydraulic dampers so as to be paired; And a spring damper disposed between the balance holding device and the magnetic field hydraulic damper for primarily damping vibrations generated in the cable by spring elasticity, wherein the magnetic field hydraulic damper is a combination of a hydraulic damper and an MR damper, The damper is operated by a hydraulic damper or an MR damper in correspondence with the magnitude of vibration generated by the damper, and the cable is secondarily damped by the hydraulic damper, and the cable is thirdarily damped by the MR damper.

Here, when the vibration of the cable exceeds the vibration damping capacity of the spring damper, the symmetrically arranged storage hydraulic damper operates as a hydraulic damper to vibrate the vibration of the cable in a second order, and the vibration of the cable is transmitted to the hydraulic damper The magnetic field hydraulic damper operates as an MR damper to vibrate the vibration of the cable in the third order.

Wherein the hexagonal collar is installed to clamp a damper support frame on a transition pipe through which the cable penetrates and then squeeze the cable on the damper support frame, the hexagonal collar including first and second half- The collar can be fastened using fastening bolts.

Here, the balance holding device may include a first plate disposed to be in close contact with an outer surface of the hexagonal collar; A second plate disposed at a predetermined distance from the first plate; A balance holding spring installed between the first and second plates so that a magnet attached to the second plate is in balance with a magnet of the magnetic field hydraulic damper; A cardan joint disposed at a center between the first and second plates and connecting the first and second plates; And a magnet attached to the outer surface of the second plate so as to face the same pole as the magnet of the magnetic field hydraulic damper.

Here, when the magnet of the equilibrium holding device moves, the cylinder rod of the hydraulic cylinder connected to the magnet of the opposing magnetic field hydraulic damper moves, so that the vibration of the cable can be suppressed by operating the magnetic field hydraulic damper.

Here, the magnetic field hydraulic damper may include a damper fixing frame disposed on the damper supporting frame to enclose and fix the hydraulic cylinder; A hydraulic cylinder which is formed in a cylindrical shape and in which a hydraulic line is drawn out to both sides of the outer side surface and a cylinder rod is formed on the inner side surface; A cylinder seating member for seating the hydraulic cylinder on the damper fixing frame; And a magnet attached to an end of the cylinder rod extending inwardly from the hydraulic cylinder and spaced apart by a predetermined distance so that the same pole as the magnet of the balance holding device faces.

The cable damper including the magnetic field hydraulic damper and the spring damper of the symmetrical hydraulic line according to the present invention may further include a protection cap installed on the magnetic field hydraulic damper to protect the magnetic field hydraulic damper.

As another means for achieving the above-mentioned technical object, a cable vibration control method using a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to the present invention is a cable vibration control method using a cable bridge such as a cable- A cable vibration control method using a cable damper for cable vibration damping, comprising the steps of: a) installing a cable damper having a hexagonal collar, a balance holding device, a spring damper and a magnetic field hydraulic damper on a cable; b) vibration of the cable is primarily caused by spring elasticity of a spring damper transmitted through a hexagonal collar when microvibration occurs on the cable; c) when the vibration of the cable exceeds the vibration damping capacity of the spring damper, symmetrically arranged storage hydraulic damper acts as a hydraulic damper to secondarily vibration the vibration of the cable; And d) when the vibration of the cable exceeds the vibration damping capacity of the hydraulic damper, the magnetic field hydraulic damper operates as an MR damper to thirdarily vibration the vibration of the cable, wherein the magnetic field damper includes a hydraulic damper And an MR damper coupled to the cable and operating as a hydraulic damper or an MR damper corresponding to the magnitude of vibration generated in the cable, wherein the cable is secondarily demagnetized by the hydraulic damper, and the cable is thirdarily demagnetized by the MR damper .

According to the present invention, when a cable bridge such as a cable-stayed bridge or a suspension bridge is demolished, the damper is firstly damped using a spring damper. When the cable vibration exceeds the vibration damping capacity of the spring damper, the symmetrically arranged magnetic field hydraulic damper The vibration of the cable is quadratically operated. When the vibration of the cable exceeds the vibration damping capacity of the hydraulic damper, the magnetic-field hydraulic damper operates as the MR damper, so that the vibration of the cable can be eliminated by the third order. .

According to the present invention, the spring damper is firstly muffled without the operation of the magnetic field hydraulic damper when minute vibration is generated in the cable, so that the service life of the magnetic field hydraulic damper can be extended.

FIGS. 1A and 1B are schematic views respectively showing a viscous device or a viscoelastic device mainly used when vibration occurs in a cable-stayed cable structure or a suspension cable structure of a suspension bridge according to a conventional technique.
2 is a view showing a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention.
3 is a view showing a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention.
FIG. 4 is a view showing a hexagonal collar coupled with a balance holding device in a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention. FIG.
5 is a view illustrating a balance maintaining apparatus in a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention.
6 is a view showing a magnetic field hydraulic damper in a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention.
7 is a view for explaining the operation of the balance holding device in a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention.
FIG. 8 is a view for explaining a state before operation of a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention.
9 is a view for explaining a state after operation as a working principle of a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention.
10 is a view showing that a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention operates as a spring damper, a secondary hydraulic damper, and a tertiary MR damper.
11 is a flowchart illustrating a method of installing a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention.
12A to 12I are views for explaining a concrete method of installing a cable damper having a magnetic field hydraulic damper and a spring damper of the symmetrical hydraulic line shown in FIG.
13 is a flowchart of a method of controlling a cable vibration using a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Cable Damper (400) Having Magnetic Hydraulic Damper and Spring Damper of Symmetrical Hydraulic Line)

FIG. 2 is a view showing a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a magnetic field hydraulic damper of a symmetrical hydraulic line according to an embodiment of the present invention, Fig. 3 (a) is a perspective view, and Fig. 3 (b) is a plan view.

2, a cable damper 400 having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention is installed on a damper supporting frame 300. At this time, the damper supporting frame 300 is fastened on the transition pipe 200 through which the cable 100 passes.

As will be described later, the cable damper 400 having the magnetic field hydraulic damper and the spring damper of the symmetrical hydraulic line according to the embodiment of the present invention primarily damages the cable 100 using the spring damper, The cable 100 is secondarily muffled by the hydraulic damper of the magnetic field hydraulic damper 430 forming the hydraulic line 440 and the cable 100 is fixed by the MR damper of the magnetic field hydraulic damper 430 to the third It is shaken by car. That is, the spring damper, the hydraulic damper, and the MR damper are sequentially operated according to the magnitude of the vibration generated in the cable 100.

3 (a) and 3 (b), a cable damper 400 having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention includes a hexagonal collar 410, A magnetic field hydraulic damper 430, a hydraulic line 440, and a spring damper 450.

The hexagonal collar 410 is formed into a circular shape on the inner circumferential surface and has a hexagonal shape on the outer surface so as to compress the cable 100. The hexagonal collar 410 includes a transition pipe 200 through which the cable 100 passes, The damper supporting frame 300 is mounted on the damper supporting frame 300 so as to press the cable 100 thereon. As will be described later, the hexagonal collar 410 can fasten the segmented first and second half hexagonal collar 410a and 410b using fastening bolts.

The balancing device 420 is in close contact with each of the hexagonal outer surfaces of the hexagonal collar 410 to balance the magnets of the magnetic field hydraulic damper 430. At this time, the balance holding device 420 may be integrally formed with the hexagonal collar 410, for example, six balance holding devices 420 are disposed.

The magnetic field hydraulic damper 430 is disposed to be spaced apart from the equilibrium holding device 420 by a predetermined distance, and each of the magnetic field hydraulic damper 430 and the magnetic field hydraulic damper 430 operates in pairs. At this time, the magnetic field hydraulic damper 430 is coupled with the hydraulic damper and the MR damper, and operates as a hydraulic damper and an MR damper, respectively, corresponding to the magnitude of vibration generated in the cable 100. That is, the cable 100 is secondarily damped by the hydraulic damper, and the cable 100 is thirdly defrosted by the MR damper.

The hydraulic line 440 is drawn out from each of the magnetic field hydraulic dampers 430 and connects the hydraulic pressure so that the symmetrically arranged magnetic field hydraulic dampers 430 are operated in pairs. For example, three hydraulic lines 440 are formed.

The spring damper 450 is disposed between the balance holding device 420 and the magnetic field hydraulic damper 430 to primarily vibrate vibration generated in the cable 100 by spring elasticity.

The magnetic field damper 430 may further include a protection cap 460 installed on the magnetic field hydraulic damper 430 to protect the magnetic field damper 430.

4 is a view showing a hexagonal collar coupled with a balance holding device in a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention, 4 (b) is a disassembled assembly view of the hexagonal collar 410, and Fig. 4 (c) is a perspective view of the equilateral holding device 420. Fig.

As shown in FIG. 4A, the hexagonal collar 410 is integrally formed with the balance holding device 420 coupled to each of the hexagonal outer surfaces thereof. 4 (b), a hexagonal collar 410 (see FIG. 4 (b)) is used to fasten the cable 100 by fastening the first and second half hexagonal collar 410a and 410b using the fastening bolt 410c. Is formed. Accordingly, when vibration occurs in the cable 100, the vibration is transmitted through the hexagonal collar 410 installed to press the cable 100. The transmitted vibration is transmitted to the spring damper 450 and the magnetic field hydraulic damper Can be demagnetized step by step.

5 is a diagram specifically illustrating a balance maintaining apparatus in a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention. 5 (b) is an exploded view of the equilibrium holding device 420. As shown in Fig.

5B, the balancing device 420 includes a first plate 421, a second plate 422, a balancing spring 423, a cardan joint 424, and a magnet 425, .

The first plate 421 is disposed in close contact with the outer surface of the hexagonal collar 410 and the second plate 422 is spaced apart from the first plate 421 by a predetermined distance.

The balancing spring 423 is disposed between the first and second plates 421 and 422 so that the magnet 425 attached to the second plate 422 is in balance with the magnet 434 of the magnetic field damper 430. [ .

The cardan joint 424 is disposed at the center between the first and second plates 421 and 422 to connect the first and second plates 421 and 422.

The magnet 425 is attached to the outer surface of the second plate 422 and is installed so that the same pole as the magnet 434 of the magnetic field hydraulic damper 430 is opposed to the magnet 424, When the magnet 425 moves, the cylinder rod of the hydraulic cylinder 432 connected to the magnet 434 of the opposing magnetic field hydraulic damper 430 is moved as shown in FIG. 6 Accordingly, the vibration of the cable 100 can be suppressed by operating the magnetic field hydraulic damper 430.

6 (a) is a front perspective view and FIG. 6 (b) is a front elevational view of the damper. FIG. 6 (a) is a front perspective view of a damper of a magnetic field damper according to an embodiment of the present invention. 6 (b) is a rear perspective view, and Fig. 6 (c) is an exploded view.

The magnetic field hydraulic damper 430 includes a damper fixing frame 431, a hydraulic cylinder 432, a cylinder seating member 433, and a magnet 434, as shown in Fig.

The damper fixing frame 431 is disposed on the damper supporting frame 300 to enclose and fix the hydraulic cylinder 432.

The hydraulic cylinder 432 is formed such that the hydraulic line 440 is extended to both sides of the outer side surface and the cylinder rod is extended to the inner side of the hydraulic cylinder 432. Hydraulic oil or MR fluid may be injected into the hydraulic cylinder 432. At this time, a spring damper 450 is installed between the inner surface of the hydraulic cylinder 432 and the second plate 422 of the balance holding device 420.

The damper fixing frame 431 and the cylinder seating member 433 are respectively fixed to the damper fixing frame 431 by a cylindrical hydraulic cylinder 432, And can be fastened to each other.

The magnet 434 is attached to the end of the cylinder rod extending inward from the hydraulic cylinder 432 and is spaced apart by a predetermined distance so that the same pole as the magnet 425 of the above-described balance holding device 420 is opposed. The magnet 434 magnetizes the MR fluid injected into the hydraulic cylinder 432 when the magnet 434 is brought close to the hydraulic cylinder 432 by the thrust of the balance holding device 420 with the magnet 425 The magnetic field hydraulic damper 430 operates as an MR damper and the vibration generated in the cable 100 is thirdly demagnetized. That is, when the piston in the hydraulic cylinder 432 shrinks, the magnet 434 approaches the hydraulic cylinder 432. At this time, the magnetization of the MR fluid 480 is started by the magnet 434 to which the MR fluid 480 approaches, As the resistance increases rapidly, the vibration damping effect can be maximized.

7 is a view for explaining the operation of the balancing device in the cable damper having the magnetic field hydraulic damper and the spring damper of the symmetrical hydraulic line according to the embodiment of the present invention.

In the case of the cable damper 400 having the magnetic field hydraulic damper and the spring damper of the symmetrical hydraulic line according to the embodiment of the present invention, as shown in FIG. 7, when vibration occurs in the cable 100, The hexagonal collar 410 on which the ball bearing 100 is mounted moves while the opposing magnets 425 and 434 are displaced to generate an eccentric magnetic field. The balance holding spring 423 of the balancing device 420, The joint 424 maintains the balance. That is, even when an eccentric magnetic field is generated, the equilibrium can be maintained such that the magnets 425 and 434 opposed to each other by the equilibrium holding device 420 maintain the same interval.

8 is a view for explaining a pre-operation state of a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention, wherein FIG. 8A is a plan view 8 is a front view, and FIG. 9 is a view for explaining a state after operation as a working principle of a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention, 9 (a) is a plan view, and Fig. 9 (b) is a front view.

In a cable damper 400 having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention, as shown in Figs. 8A and 8B, a pair of symmetrically arranged pairs The operation of the magnetic-field hydraulic damper 430 of FIG.

8 (a) and 8 (b) show a cable damper 400 having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention when the vibration is not generated in the cable 100 9 (a) and 9 (b) show a cable damper 400 having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention as vibration occurs in the cable 100 ) Is operating.

 9 (a) and 9 (b), when vibration is generated in the cable 100, the vibration damper 450 firstly destroys the vibration by the spring damper 450, The magnetic field hydraulic damper 430 acts as a hydraulic damper to move the hydraulic pressure along a symmetrically arranged hydraulic line so as to secondarily vibrate the vibration of the cable 100. At this time, The vibrations of the hydraulic cylinders 432 of the magnetic field hydraulic damper 430 are transmitted to the pistons in the hydraulic cylinders 432 of the magnetic field hydraulic damper 430 while the dynamic parallel surfaces are maintained by the balancing device 420 with the thrusts of the magnets 425 and 434, So that the magnetic field hydraulic damper 430 operates as a hydraulic damper. When the vibration damping capacity of the hydraulic damper is exceeded, the magnetic field hydraulic damper 430 acts as an MR damper to defrost the vibration of the cable 100 by a third order.

10 is a view showing that a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention operates as a spring damper, a secondary hydraulic damper and a tertiary MR damper, 10 (a) shows a spring damper, Fig. 10 (b) shows a hydraulic damper, and Fig. 10 (c) shows an MR damper.

In the case of the cable damper 400 having the magnetic field hydraulic damper and the spring damper of the symmetrical hydraulic line according to the embodiment of the present invention, as shown in FIG. 10A, the cable damper 400, using the spring damper 450, 100 so as to absorb small vibrations occurring in the first and second directions. At this time, if a small vibration is generated in the cable 100, the operation of the hydraulic damper is minimized by suppressing the cable 100 by the spring damper 450, so that the life of the hydraulic damper can be extended.

10, the cable damper 400 having the magnetic field hydraulic damper and the spring damper of the symmetrical hydraulic line according to the embodiment of the present invention is configured such that the magnetic field hydraulic damper 430 is fixed to the second Hydraulic damper, and operates when the vibration generated in the cable 100 exceeds the vibration damping capacity of the elastic spring of the primary spring damper 450. At this time, the secondary hydraulic dampers are coupled by symmetrically arranged hydraulic lines 440, so that they operate in pairs with symmetrically arranged hydraulic dampers facing each other. At this time, the hydraulic damper can be individually repaired.

10, the cable damper 400 having the magnetic field hydraulic damper and the spring damper of the symmetrical hydraulic line according to the embodiment of the present invention has a structure in which the magnetic field hydraulic damper 430 is fixed to the third The third MR damper may apply the MR fluid 480 to the hydraulic cylinder 432 instead of the normal hydraulic oil 470. In this case, And the MR fluid (Magneto Rheological Fluid) 480 is magnetized by the approaching magnet 434, thereby increasing the resistance. At this time, the ER fluid may be used instead of the MR fluid 480.

As a result, when the cable damper 400 according to the embodiment of the present invention transmits the cable vibration to the hydraulic cylinder of the magnetic field hydraulic damper through the hexagonal collar, the vibration of the cable is suppressed while maintaining the separation distance by using both magnets, , A magnetic field hydraulic damper of a symmetrical hydraulic line, and a spring damper. By performing the three-stage damping operation as described above, the vibration of the cable can be effectively damped.

[Method of installing cable damper with magnetic damper and spring damper of symmetrical hydraulic line]

FIG. 11 is a flowchart of a method of installing a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention. FIGS. 12A to 12I are cross- A magnetic damper, a magnetic damper, and a spring damper.

11 and 12A to 12I, a method of installing a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention is characterized in that a cable damper including a transition pipe A framework tube 200 is installed (S110). Specifically, as shown in FIG. 12A, the transition pipe 200 is formed with a plurality of fastening holes h1.

Next, the first half-type damper supporting frame 300a is disposed on the transition pipe 200 (S120). 12B, a coupling member 310 is attached to the first half-type damper supporting frame 300a, and a second coupling hole h2 is formed. For example, the coupling member 310 310 may be a rubber sealing material.

Next, as shown in FIG. 12C, a second half-type damper supporting frame 300b to be fastened to the first half-type damper supporting frame 300a is disposed on the transition pipe 200, The damper supporting frame 300 is formed by fastening the first and second half type damper supporting frames 300a and 300b using the bolts 330 and the transition pipe 200 and the damper supporting frame 300, Is fastened using the first fastening bolts 320 (S130).

Next, as shown in FIG. 12D, the first half-type hexagonal collar 410a integrated with the balancing device 420 is disposed on the first half-damper supporting frame 300a (S140).

Next, as shown in FIG. 12E, the second half-type hexagonal collar 410b integrated with the balance holding device 420 is disposed on the second half-type damper supporting frame 300b, and the third fastening bolt 410c The first half-type hexagonal collar 410a and the second half-type hexagonal collar 410b are fastened (S150).

Next, a first half-type magnetic field hydraulic damper 430a is installed to oppose the balance holding device 420 coupled to the first half-hexagonal collar 410a (S160). 12F, the first half-type magnetic-field hydraulic damper 430a is disposed so as to face the balance-maintaining device 420 in a manner that the spring damper 450 is engaged.

Next, the second half-type magnetic-field hydraulic damper 430b, which is opposed to the balance holding device 420 coupled with the second half-hexagonal collar 410b, is installed symmetrically (S170). 12G, the second half-type magnetic field hydraulic damper 430b is symmetrically disposed with respect to the first half-type magnetic-field hydraulic damper 430a, and similarly, the spring damper 450 is coupled (Not shown).

Next, as shown in FIG. 12H, the hydraulic lines 440 drawn out from the first and second half-type magnetic field hydraulic dampers 430a and 430b are respectively connected to symmetrically arranged hydraulic lines (S180 ).

Next, as shown in FIG. 12I, the ER fluid or the MR fluid 480 is filled in the hydraulic cylinder 432 of the first and second half-field-type hydraulic dampers 430a and 430b, The protection cap 460 is installed on the second half-type magnetic-field hydraulic damper 430a and 430b (S190). Here, in the cable damper 400 having the magnetic field hydraulic damper and the spring damper of the symmetrical hydraulic line according to the embodiment of the present invention, the hexagonal collar 410 has been described as a collar. However, Do.

[Cable vibration control method using cable damper with magnetic field hydraulic damper and spring damper of symmetrical hydraulic line]

13 is a flowchart of a method of controlling a cable vibration using a cable damper having a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention.

13, a cable vibration control method using a cable damper including a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line according to an embodiment of the present invention includes a hexagonal collar 410, a balance holding device 420 A cable damper 400 having a spring damper 450 and a magnetic field hydraulic damper 430 is installed on the cable 100 at step S210.

Next, the vibration transmitted to the cable 100 through the hexagonal collar 410 when the micro vibration is generated is primarily damped by the spring damper 450 by spring elasticity (S220).

Next, when the vibration of the cable 100 exceeds the vibration damping capacity of the spring damper 450, the symmetrically arranged storage hydraulic damper 430 operates as a hydraulic damper to vibrate the cable 100 (S230).

Next, when the vibration of the cable 100 exceeds the vibration damping capacity of the hydraulic damper, the magnetic field hydraulic damper 430 operates as an MR damper to quench the vibration of the cable 100 by the third order (S240) . The magnetic field hydraulic damper 430 is a combination of a hydraulic damper and an MR damper. The magnetic damper 430 operates as a hydraulic damper or an MR damper in response to a magnitude of vibration generated in the cable 100, And the cable 100 is thirdly defrosted by the MR damper. Further, it is preferable that only the spring damper 450 is firstly damped without operating the magnetic field hydraulic damper 430 when microvibration is generated in the cable.

As a result, according to the embodiment of the present invention, when a cable bridge such as a cable-stayed bridge or a suspension bridge is demolished, the cable is firstly demolished by using a spring damper, and when the cable vibration exceeds the vibration damping capacity of the spring damper, The damper operates as a hydraulic damper to secondarily disturb the cable vibration. When the vibration of the cable exceeds the vibration damper capacity of the hydraulic damper, the magnetic-field hydraulic damper operates as an MR damper, so that the vibration of the cable can be suppressed by the third order. Vibration can be damped effectively. In addition, the life of the magnetic field hydraulic damper can be prolonged by suppressing the spring damper firstly without the operation of the magnetic field hydraulic damper when microvibration occurs in the cable.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: Cable 200: Transition pipe
300: damper supporting frame 400: cable damper
300a, 300b: half-type damper supporting frame 310:
320, 330: fastening bolt 410: hexagonal collar
410a, 410b: half hexagonal collar 410c: fastening bolt
420: balance maintaining device 430: magnetic field hydraulic damper
430a, 430b: half type magnetic field hydraulic damper 440: hydraulic line
450: spring damper 460: protective cap
470: Hydraulic oil 480: MR fluid (or ER fluid)
421: first plate 422: second plate
423: Balancing spring 424: Cardan Joint
425: Magnet 431: Frame for damper fixing
432: Hydraulic cylinder 433: Cylinder seating member
434: Magnet

Claims (10)

Cable damper of a cable bridge such as a cable-stayed bridge or a suspension bridge,
A hexagonal collar 410 disposed on the damper supporting frame 300 and having an inner circumferential surface formed in a circular shape and an outer surface formed in a hexagonal shape so as to compress the cable 100;
An equilibrium retainer 420 disposed in close contact with each of the hexagonal outer surfaces of the hexagonal collar 410 to balance the magnets of the magnetic field hydraulic damper 430;
A magnetic field hydraulic damper 430 arranged to be spaced apart from the balance holding device 420 by a predetermined distance, and operating in pairs with opposing magnetic field hydraulic dampers 430;
A hydraulic line 440 drawn from each of the magnetic field hydraulic dampers 430 to connect the magnetic field hydraulic dampers 430 symmetrically arranged to operate in pairs; And
And a spring damper (450) disposed between the balance holding device (420) and the magnetic field hydraulic damper (430) for primarily damping vibration generated in the cable (100) by spring elasticity,
The magnetic field hydraulic damper 430 is a combination of a hydraulic damper and an MR damper and operates as a hydraulic damper or an MR damper corresponding to the magnitude of vibration generated in the cable 100, And the cable damper damages the cable (100) by the MR damper in a third order. The cable damper as claimed in claim 1, wherein the cable damper comprises a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line. The method according to claim 1,
When the vibration of the cable 100 exceeds the vibration damping capacity of the spring damper 450, the symmetrically arranged storage hydraulic damper 430 operates as a hydraulic damper to vibrate the vibration of the cable 100 in a second order , And when the vibration of the cable (100) exceeds the vibration damping capacity of the hydraulic damper, the magnetic field hydraulic damper (430) operates as an MR damper to vibrate the vibration of the cable (100) Cable damper with magnetic field hydraulic damper and spring damper of symmetrical hydraulic line. The method according to claim 1,
The hexagonal collar 410 is installed to clamp the damper supporting frame 300 on the transition pipe 200 through which the cable 100 passes and then press the cable 100 on the damper supporting frame 300 Wherein the hexagonal collar (410) fastens the segmented first and second half hexagonal collar (410a, 410b) using fastening bolts (410). The symmetrical hydraulic line damper and spring Cable damper with damper. The apparatus of claim 1, wherein the balance holding device (420)
A first plate (421) arranged to be in close contact with an outer surface of the hexagonal collar (410);
A second plate 422 spaced apart from the first plate 421 by a predetermined distance;
And a magnet 425 attached to the second plate 422 is disposed between the first and second plates 421 and 422 so as to maintain a balance with the magnet 434 of the magnetic field hydraulic damper 430. [ A spring 423;
A cardan joint 424 disposed at the center between the first and second plates 421 and 422 to connect the first and second plates 421 and 422; And
And a magnet (425) attached to the outer surface of the second plate (422) so as to face the same pole as the magnet (434) of the magnetic field hydraulic damper (430) Cable damper with damper. 5. The method of claim 4,
The cylinder rod of the hydraulic cylinder 432 connected to the magnet 434 of the opposing magnetic field hydraulic damper 430 is moved to move the magnetic field hydraulic damper 430) is operated to damp the vibration of the cable (100). The cable damper as claimed in claim 1, wherein the damper is a cable damper having a magnetic field hydraulic damper and a spring damper. The magnetic field damper according to claim 1, wherein the magnetic field hydraulic damper (430)
A damper fixing frame 431 disposed on the damper supporting frame 300 to enclose and fix the hydraulic cylinder 432;
A hydraulic cylinder 432 which is formed in a cylindrical shape and in which the hydraulic line 440 is drawn out to both sides on the outer side and the cylinder rod is extended on the inner side;
A cylinder seating member 433 for seating the hydraulic cylinder 432 on the damper fixing frame 431; And
And a magnet 434 attached to the end of the cylinder rod extending inward from the hydraulic cylinder 432 and spaced apart by a predetermined distance so that the same pole as the magnet 425 of the balance holding device 420 faces Cable damper with magnetic field hydraulic damper and spring damper of symmetrical hydraulic line. The method according to claim 1,
And a protection cap (460) installed on the magnetic field hydraulic damper (430) to protect the magnetic field hydraulic damper (430). A cable vibration control method using a cable damper for cable damper of a cable bridge such as a cable-stayed bridge or a suspension bridge,
a) installing a cable damper (400) on a cable (100) having a hexagonal collar (410), a balancing device (420), a spring damper (450) and a magnetic field hydraulic damper (430);
b) vibrating the vibration of the cable (100) by spring elasticity of the spring damper (450) by a vibration transmitted through the hexagonal collar (410) when the micro vibration is generated on the cable (100);
c) When the vibration of the cable 100 exceeds the vibration damping capacity of the spring damper 450, the symmetrically arranged storage hydraulic damper 430 operates as a hydraulic damper to reduce the vibration of the cable 100 to 2 Damping by a car; And
d) vibration of the cable (100) is quenched by operating the magnetic field hydraulic damper (430) as an MR damper when the vibration of the cable (100) exceeds the vibration damping capacity of the hydraulic damper ,
The magnetic field hydraulic damper 430 is a combination of a hydraulic damper and an MR damper and operates as a hydraulic damper or an MR damper corresponding to the magnitude of vibration generated in the cable 100, And the cable damper damages the cable 100 by the MR damper. The cable damper according to claim 1, wherein the cable damper comprises a spring damper and a magnetic field hydraulic damper of a symmetrical hydraulic line. The apparatus according to claim 8, wherein the balance holding device (420)
A first plate (421) arranged to be in close contact with an outer surface of the hexagonal collar (410);
A second plate 422 spaced apart from the first plate 421 by a predetermined distance;
And a magnet 425 attached to the second plate 422 is disposed between the first and second plates 421 and 422 so as to maintain a balance with the magnet 434 of the magnetic field hydraulic damper 430. [ A spring 423;
A cardan joint 424 disposed at the center between the first and second plates 421 and 422 and connecting the first and second plates 421 and 422,
And a magnet (425) attached to the outer surface of the second plate (422) so as to face the same pole as the magnet (434) of the magnetic field hydraulic damper (430) Method for controlling cable vibration using a cable damper with a damper. The apparatus of claim 8, wherein the magnetic field hydraulic damper (430)
A damper fixing frame 431 disposed on the damper supporting frame 300 to enclose and fix the hydraulic cylinder 432;
A hydraulic cylinder 432 which is formed in a cylindrical shape and in which the hydraulic line 440 is drawn out to both sides on the outer side and the cylinder rod is extended on the inner side;
A cylinder seating member 433 for seating the hydraulic cylinder 432 on the damper fixing frame 431; And
And a magnet 434 attached to the end of the cylinder rod extending inward from the hydraulic cylinder 432 and spaced apart by a predetermined distance so that the same pole as the magnet 425 of the balance holding device 420 faces (Method for controlling cable vibration using a cable damper with a magnetic field hydraulic damper and a spring damper of a symmetrical hydraulic line.

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