KR101726311B1 - CABLE DAMPER OF StockBridge TYPE WITH MULTIPLE MASS AT BOTH SIDES OF CONNECTING MEMBER - Google Patents

Abstract

The present invention relates to an asymmetrical stockbridge type cable damper to reduce various vibration of a cable of a bridge or a power line and, more specifically, provides a stockbridge type cable damper with multiple mass at both sides of a connecting member, which has multiple mass for controlling vibration at both sides of a connecting member to reduce all of cable vibration having the various number of vibration such as the high number of vibration more than 10 Hz and the low number of vibration less than 10 Hz, which can may be generated in the cable. Moreover, the multiple mass is individually vibrated at both sides of the connecting member to control the number of vibration more than 4, and in addition to a weight, a shape, and a position of the mass, rigidity and decrement of the connecting member can be variously controlled to easily control distribution of the number of vibration and decrement characteristics of the cable damper.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a cable damper of a stock bridge type having a plurality of mass bodies on both sides of a connecting member,

More particularly, the present invention relates to a cable damper for reducing various vibrations of a cable such as a bridge or a transmission line, and more particularly, to a cable damper having a plurality of mass- A cable in the form of a stock bridge (SB) capable of reducing cable vibrations having various frequencies of 10 Hz or more (hereinafter referred to as "high frequency") and a low frequency of 10 Hz or less To a damper.

With reference to Figs. 1 to 3, a description will be given of a conventional 1-resonance stock bridge damper, a 2-resonance stock bridge damper, and a 4-resonance stock bridge damper, respectively.

Fig. 1 is a view for explaining a 1-Resonance Stock Bridge Damper according to the related art. Fig. 1 (a) is a side view in which one resonance stock bridge damper is installed. Fig. 1 (b) 1 (c) shows a mode shape, respectively.

1, a resonance stock bridge damper 20 according to a conventional technique is a damper for reducing vibration of a high frequency such as vortex-induced vibration of a transmission line, A clamp 21 for fixing the messenger cable 22 to a transmission line 13 to be damped and two concrete masses 23 fixed to both ends of the messenger cable 22, Here, reference numeral 11 denotes an insulator, and reference numeral 12 denotes a suspension clamp.

This vortex vibration occurs when a wind is applied to a structure. It is a kind of resonance phenomenon that occurs at the wind speed where the periodicity of the vortex emitted from the structure and the natural frequency of the structure coincide with each other due to the exfoliation of the airflow. For example, in the case of a transmission line, a vortex vibration occurs in a higher-order mode where the natural frequency is at least 10 Hz.

At this time, the one resonance stock bridge damper 20 has only one frequency depending on the rigidity of the concrete mass body 23 and the messenger cable 22, and as shown in b) and c) of Fig. 1, There is a problem in that it is not suitable for controlling vibrations having various frequencies because it is possible to control only the vibration of a frequency component close to the frequency.

2 (a) is a side view in which a two-resonance stock bridge damper is installed, and FIG. 2 (b) is a side view in which a two-resonance stock bridge damper 2 is a detailed view of the two resonance stock bridge damper, c) in Fig. 2 shows the natural frequency, and Fig. 2 (d) shows the mode shape.

As shown in FIGS. 2A and 2B, the two-resonance stock bridge damper 30 according to the related art is a symmetric stock bridge damper for compensating for the disadvantage of the above-described one resonance stock bridge damper 20 A clamp 33, a messenger cable 32 and two longitudinally shaped steel masses 33. In place of the concrete masses 23 shown in a) of FIG. 1, the longitudinal steel masses 33 ).

Since one of the steel masses 33 is in contact with the messenger cable 32 because the center of gravity of the steel mass 33 is far away from the fixed point of the messenger cable 32, 32 in two modes of translational motion and rotational motion with respect to the fixed point, and becomes a two resonant stock bridge damper having two frequencies as shown in Figs. 2c) and 2d).

Accordingly, the two-resonance stock bridge damper 30 according to the related art increases the frequency range of controllable by about two times as compared with the above-described one resonance stock bridge damper 20, but controls only the vibrations having only two frequencies .

3 (a) is a side view in which a four-resonance stock bridge damper is installed, and FIG. 4 (b) is a side view in which a four-resonance stock bridge damper 4 is a detailed view of the resonance stock bridge damper, Fig. 4 (c) shows the natural frequency, and Fig. 4 (d) shows the mode shape.

3, a four resonance stock bridge damper 40 according to the prior art has a structure in which the one resonance stock bridge damper 20 and the two resonance stock bridge damper 30 described above The asymmetric stock bridge damper is composed of a clamp 41, a messenger cable 42 and two longitudinal steel masses 43. The four resonance stock bridge damper 40 is composed of two By making the size of the steel mass 43 and the length of the messenger cable 42 different as shown by L1 and L2, two natural frequencies, i.e., four natural frequencies, are provided on both sides of the messenger cable 42, As shown in Figs. 3 (c) and 3 (d), becomes a four resonance stock bridge damper.

Although the performance of the stock bridge damper has been slightly improved even after the four-resonance stock bridge damper 40 according to the related art has been started, the basic concept of reducing the vortex vibration by appropriately distributing the four natural frequencies is the concept of the stock bridge damper . That is, as shown in FIG. 3C, a high frequency of 10 Hz or more can be controlled, but a low vibration of 10 Hz or less can not be controlled.

On the other hand, there are various phenomena such as vortex-induced vibration, galloping, rain-wind vibration and the like caused by wind generated from a cable such as a transmission line or a bridge, The frequency of the cable varies. Particularly, in the case of vortex vibration, vibration occurs in a higher-order mode with a natural frequency of 10 Hz or more. On the contrary, galloping and windwave vibration generate vibrations in a low-order mode with a natural frequency of 10 Hz or less, especially 3 Hz or less.

In order to prevent such low-order mode vibration, a transmission line uses an inter-phase spacer. However, such an inter-phase spacer is very expensive and can break the transmission line.

Meanwhile, in order to prevent the low-order mode wind-induced vibration of the bridge, a cable damper such as an oil damper or a friction damper is used to reduce cable vibration. In order to install such a cable damper, a support structure for supporting the cable damper need.

FIG. 4 is a view for explaining an oil damper mainly used when vibration occurs in a cable-stayed bridge cable structure according to a conventional technique, and FIG. 5 is a view for explaining an oil damper mainly used when a vibration occurs in a hanger cable structure of a suspension bridge, Fig. 8 is a view for explaining a friction damper used.

4 and 5, when vibration occurs in the cable 51 of the cable-stayed bridge 50 or the hanger cable 61 of the suspension bridge 60 according to the related art, the vibration of the oil damper 52 or friction A damper 62 and the like are provided at the ends of the cables 51 and 61 to control the vibration using the viscosity of the oil damper 52 or the friction of the friction damper 62. However, such an oil damper 52 or the friction damper 62 is disadvantageous in that periodic maintenance is required. In addition, as shown in Fig. 4 (b) and Fig. 5 (b), there is a disadvantage that separate support structures are required for installation of the oil damper 52 or the friction damper 62, respectively.

The installation of such a support structure is undesirable not only in terms of cost increase but also in that damping force is transmitted to the bridge through such support structure. Further, in order to increase the damping force, it is advantageous that the distance from the cable fixture to the damper installation position is long, but the supporting structure must also be enlarged. Moreover, these oil dampers 52 or friction dampers 62 are mostly expensive, and there is a problem that faults such as oil leakage are frequent.

6A and 6B illustrate a symmetrical stock bridge damper and an asymmetric stock bridge damper according to the related art. FIG. 6A is a cross-sectional view of the symmetrical stock bridge damper 30 shown in FIG. 2B, And Fig. 6 (b) specifically shows the asymmetric stock bridge damper 40 shown in Fig. 3 (b).

6 (a) and 6 (b), in the case of the symmetrical stock bridge damper 30 and the asymmetric stock bridge damper 40 according to the related art, the oil damper 52 Of the present invention, and it is provided on the cable 13 as a stock bridge damper for a transmission line which requires no maintenance. However, in the case of the symmetrical stock bridge damper 30 and the asymmetric stock bridge damper 40 according to the related art, as described above, the region is in the high frequency region and the frequency region is not so wide. That is, the cable dampers 30 and 40 of the stock bridge type according to the related art have a problem in that they are not effective in the vibration occurring in various cables 13, particularly in the region of low vibration.

In the case of the stock bridge-type cable dampers 30 and 40 according to the related art, the mass bodies 33 and 43 are arranged on only one side of the messenger cables 32 and 42, There is a problem that the vibration of the cable having the low vibration frequency of 10 Hz or less and the vibration frequency of the high frequency of 10 Hz or more can not be simultaneously reduced because the frequency is limited to 2 to 4.

That is, the cable dampers 30 and 40 of the stock bridge type according to the conventional technique can reduce cable vibration having a high frequency of 10 Hz or more, but can not reduce cable vibration having a low vibration frequency of 10 Hz or less, Accordingly, there is a need for a cable damper that can control not only a high frequency band of 10 Hz or more but also a cable vibration of a low vibration frequency band of 10 Hz or less.

Korean Patent No. 10-1292645 filed on Feb. 22, 2013, entitled "Stockbridge Damper Holder" Korean Registered Utility Model No. 20-303374 (filing date: October 28, 2002), design title: "Structure of Stockk Bridge Damper for Wires" United States Patent No. 1675391 filed on November 12, 1925, entitled "Vibration damper" United States Patent No. 1992538 filed on March 31, 1933, entitled "Vibration damper" United States Patent No. 3432610 filed on August 21, 1967, entitled "VIBRATION DAMPERS FOR SUSPENDED MEMBERS" Korean Patent No. 10-1564975 filed on Mar. 8, 2013, entitled "Protecting a bare cable from vibration" Korean Patent No. 10-770433 filed on May 18, 2006, entitled "Damping Device for Vibration Control of Lead Cable" Korean Patent No. 10-1166258 filed on November 2, 2009, entitled "Vibration Control Device for Construction Structures" Korean Patent No. 2012-72239 (Published on July 3, 2012), entitled "Vibration Abatement Device for Suspension Bridge Cable"

SUMMARY OF THE INVENTION [0008] In order to solve the above-described problems, a technical object of the present invention is to provide a bridge bridge type cable damper for reducing various vibrations of a cable such as a bridge or a transmission line, wherein a plurality of mass bodies for vibration control are provided on both sides of the bridge To provide a cable bridge dam in the form of a stock bridge having a plurality of masses on both sides of a connecting member capable of reducing all the cable vibrations having various frequencies such as a high frequency of 10 Hz or more and a low vibration frequency of 10 Hz or less, .

Another object of the present invention is to provide a vibration damping device capable of controlling four or more vibrations by vibrating a plurality of mass bodies disposed on both sides of a coupling member and capable of easily adjusting a frequency distribution and an attenuation characteristic of the cable damper, And to provide a cable damper of the stock bridge type having a plurality of mass bodies on both sides.

As a means for achieving the above-mentioned technical object, a cable bridge damper of the present invention having a plurality of mass bodies on both sides of a joint member is installed in a cable of a bridge or a transmission line to reduce various vibrations generated in the cable A cable damper in the form of an asymmetric stock bridge, comprising: a fixing device fixed to an outer circumferential surface of the cable; A linkage fixed to the fixture to provide stiffness and damping; And a mass that is fixedly connected to both sides of the coupling member to provide an inertial force, wherein a plurality of the mass bodies are disposed on both sides of the coupling member.

Here, the mass may be selected from at least one of a horseshoe-shaped mass, a bell-shaped mass, or a spherical mass.

Here, it is preferable that the connecting member is provided with a spiral steel wire on all or a part of the connecting member so as to increase the rigidity, fatigue and damping performance of the connecting member.

As another means for achieving the above-mentioned technical object, a cable bridge dam having a plurality of mass bodies on both sides of a connecting member according to the present invention is installed in a cable of a bridge or a transmission line, Wherein the cable damper includes a fixing device fixed to an outer circumferential surface of the cable; A connecting member fixed to the fixing device at a central fixing point to provide stiffness and damping; Two first mass bodies fixed to both sides of the coupling member and vibrated in two modes of translational motion and rotational motion with respect to an anchor point of the coupling member to provide an inertial force for vibration generated in the cable; And two second mass bodies disposed on the outer side of the first mass body and vibrated in a translational motion mode with respect to an anchor point of the connecting member, wherein the two first mass bodies and the two second mass bodies form six And the vibration generated in the cable is reduced by a resonance frequency (6 Resonance).

Here, by adjusting the weight and the spacing of each of the two first mass bodies and the two second mass bodies, and the distance between the fixing apparatus and the first and second mass bodies, the vortex-induced Vibration at a high frequency of 10 Hz or more due to vibration or vibration is reduced and at the same time vibration of a low vibration frequency of 10 Hz or less due to galloping or rain-wind vibration is reduced.

Here, the two first mass bodies may be a horseshoe-shaped mass or a bell-shaped mass that vibrates in two modes of translational motion and rotational motion with respect to the fixing point of the linking member.

Here, the two second mass bodies may be spherical mass members vibrating in one mode of translational motion with respect to the fixing point of the connecting member.

Here, a plurality of additional masses each having a predetermined size may be extended on both sides of the second mass body.

Here, the cable may be a cable of a cable-stayed bridge, a hanger cable of a suspension bridge, or a transmission line cable.

As another means for achieving the above-mentioned technical object, a cable bridge dam having a plurality of mass bodies on both sides of a connecting member according to the present invention is installed in a cable of a bridge or a transmission line, Wherein the cable damper includes a fixing device fixed to an outer circumferential surface of the cable; A connecting member fixed to the fixing device at a central fixing point to provide stiffness and damping; Two first mass bodies fixed to both sides of the coupling member and vibrated in two modes of translational motion and rotational motion with respect to an anchor point of the coupling member to provide an inertial force for vibration generated in the cable; And two second mass bodies disposed on the outer side of the first mass body and oscillating in two modes of translational motion and rotational motion with respect to the fixing point of the connecting material, respectively, wherein the two first mass bodies and the two mass bodies 2 masses, the vibration generated in the cable is reduced by eight resonance frequencies (8 Resonance).

Here, the two first masses and the two second masses may each be a horseshoe-shaped mass or a bell-shaped mass that vibrates in two modes of translational motion and rotational motion with respect to the fixing point of the connecting material.

According to the present invention, there is provided a stock bridge-type cable damper for reducing various vibrations of a cable such as a bridge or a transmission line, wherein a plurality of mass bodies for vibration control are provided on both sides of the coupling member, And the vibration of the cable having various frequencies of low vibration of 10 Hz or less can be all reduced.

According to the present invention, it is possible to control four or more vibrational frequencies because a plurality of mass bodies are vibrated on both sides of the connecting member, and the weight, shape and position of the mass body as well as the rigidity and damping of the connecting member, It is possible to easily adjust the frequency distribution and attenuation characteristics of the cable damper.

According to the present invention, it is not necessary to provide a phase-to-phase spacer separately, simplifying the work process and eliminating the time loss and the additional cost associated with the manufacture and installation of phase spacers.

According to the present invention, there is no need to provide a support frame separately, and it is possible to simplify the work process and to save time, and to provide additional support for frame fabrication and installation No cost is required.

1 is a view for explaining a 1-Resonance Stock Bridge Damper according to a conventional technique.
2 is a view for explaining a two-resonance stock bridge damper according to the prior art.
3 is a view for explaining a 4-Resonance Stock Bridge Damper according to the prior art.
4 is a view for explaining an oil damper mainly used when vibration occurs in a cable-stayed bridge cable structure according to a related art.
5 is a view for explaining a friction damper mainly used when vibration occurs in a hanger cable structure of a suspension bridge according to a conventional technique.
FIG. 6 is a view showing a symmetric stock bridge damper and an asymmetric stock bridge damper according to a conventional technique.
Fig. 7 is a diagram illustrating that a plurality of mass bodies are formed of a mass body of a horn-like shape and a mass body of a spherical shape in a stock bridge-type cable damper having a plurality of mass bodies on both sides of the connecting member according to the first embodiment of the present invention.
FIG. 8 is a view illustrating that a plurality of mass bodies are formed of a mass body of a longitudinal shape and a mass body of a spherical shape in a stock bridge-type cable damper having a plurality of mass bodies on both sides of a connecting member according to the first embodiment of the present invention.
9 is a view illustrating various shapes of a plurality of mass bodies in a cable bridge dam in the form of a stock bridge having a plurality of mass bodies on both sides of a connecting member according to a first embodiment of the present invention.
10 is a view illustrating that a connecting member is formed of a spiral steel wire in a cable bridge dam in the form of a stock bridge having a plurality of mass bodies on both sides of the connecting member according to the first embodiment of the present invention.
11 is a view showing a structural analysis model and analysis results for a cable bridge dam in the form of a stock bridge having a plurality of mass bodies on both sides of a connecting member according to a first embodiment of the present invention.
12 is a view illustrating that a plurality of mass bodies are formed of a mass having a hairs shape in a cable bridge dam in the form of a stock bridge having a plurality of mass bodies on both sides of a connecting member according to a second embodiment of the present invention.
FIG. 13 is a view illustrating that a plurality of mass bodies are formed of a mass body in a shape of a stock bridge-type cable damper having a plurality of mass bodies on both sides of a connecting member according to a second embodiment of the present invention.
FIG. 14 is a diagram showing a structural analysis model and analysis results for a cable bridge dam in the form of a stock bridge having a plurality of mass bodies on both sides of a connecting member according to a second 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.

First, a cable bridge damper of a stock bridge type having a plurality of mass bodies on both sides of a connecting member according to an embodiment of the present invention includes an asymmetric stock bridge for reducing various vibrations generated in a cable, A cable damper in the form of a stock bridge, the fixing device being fixed to an outer circumferential surface of the cable; A linkage fixed to the fixture to provide stiffness and damping; And a mass which is fixedly connected to both sides of the coupling member to provide an inertial force, wherein the mass bodies are respectively disposed on both sides of the coupling member.

Here, the mass may be selected from at least one of a horseshoe-shaped mass, a bell-shaped mass or a spherical mass, and the joining material may be selected from the group consisting of a mass of the joining material, It is preferable to provide a spiral wire in whole or in part.

A cable bridge damper in the form of a stock bridge having a plurality of mass bodies on both sides of a connecting member according to an embodiment of the present invention can be realized, for example, by a six resonance stock bridge damper or an eight resonance stock bridge damper .

The cable damper 200a, 200b in the form of six resonant stock bridges and the cable damper 300a, 300b in the form of eight resonant stock bridges 300a, 300b will now be described with reference to Figs. Will be described in detail.

[First embodiment: six resonant stock bridge type cable dampers (200a, 200b)]

FIG. 7 is a view illustrating that a plurality of mass bodies are formed from a mass having a horn shape and a mass having a spherical shape in a stock bridge-type cable damper having a plurality of mass bodies on both sides of a connecting member according to a first embodiment of the present invention, 7 (a) is a side view, and Fig. 7 (b) is a bottom view.

Referring to FIG. 7, a cable bridge damper 200a having a plurality of mass bodies on both sides of a connecting member according to the first embodiment of the present invention is installed on a cable of a bridge or a transmission line, The cable damper includes a fixing device 210, a coupling member 220, two first mass members 230a, and two second mass members 240. Here, , The two first mass bodies 230a are formed of a mass having a horn shape, and the two second mass bodies 240 are formed of a mass body having a spherical shape.

Fixing device 210 is fixed to the outer circumferential surface of cable 100 and linking member 220 is fixed to the fixing device at a central fixed point to provide stiffness and damping. Here, the cable 100 may be a cable of a cable-stayed bridge, a hanger cable of a suspension bridge, or a transmission line cable. In addition, it is preferable that the connecting member 220 is provided with a spiral steel wire on all or a part of the connecting member so as to increase rigidity, fatigue and damping performance of the connecting member.

The two first mass bodies 230a are fixedly connected to both sides of the coupling member and vibrate in two modes of translational motion and rotational motion with respect to the fixing point of the coupling member to provide an inertial force for vibration generated in the cable . Further, the two second mass bodies 240 are disposed on the outer side of the first mass body and vibrate in a translational motion mode with respect to the fixing point of the connecting material.

Here, the two first mass bodies 230a may be a horseshoe-shaped mass or a bell-shaped mass that oscillates in two modes of translational motion and rotational motion with respect to the fixing point of the coupling member 220, The two second masses 240 may be spherical masses vibrating in one mode of translation with respect to the anchor point of the link 220, but are not limited thereto.

A cable bridge damper 200a having a plurality of mass bodies on both sides of a connecting member according to the first embodiment of the present invention includes four mass members 230a and 240 and a connecting member 220 connecting the mass members 230a and 240 And a fixing device 210 for fixing the connection member 220 to the cable 100. At this time, each of the first and second mass bodies 230a and 240 is configured to easily move horizontally through one connecting member 220. [ In addition, although four mass bodies 230a and 240 are disclosed in the embodiment of the present invention, a configuration of a mass body larger than that is of course possible.

Specifically, the weight and spacing of each of the two first mass bodies and the two second mass bodies, and the distance between the fixing apparatus and the first and second mass bodies, respectively, induced vibration can be reduced and vibrations of 10 Hz or less can be reduced by Galloping or Rain-Wind Vibration at the same time.

Therefore, vibration generated in the cable can be reduced by six resonance frequencies (6 Resonance) by the two first mass bodies and the two second mass bodies. In addition, a plurality of additional masses each having a predetermined size may be extended on both sides of the second mass body 240.

8 is a view showing that a plurality of mass bodies are formed of a mass body of a longitudinal shape and a mass body of a spherical shape in a stock bridge-type cable damper having a plurality of mass bodies on both sides of a connecting member according to the first embodiment of the present invention 8 (a) is a side view, and Fig. 8 (b) is a bottom view.

8, a stock bridge-type cable damper 200b having a plurality of mass bodies on both sides of a connecting member according to the first embodiment of the present invention includes a fixing device 210, a connecting member 220, The mass body 230b and the two second mass bodies 240. In this case, the two first mass bodies 230b are formed as a mass of a longitudinal shape, and the two second mass bodies 240 are formed as a mass body of a spherical shape . Compared with the above-described FIG. 7, the operation is substantially the same as that of the first mass body 230b, except that the two first mass bodies 230b are formed in a mass shape rather than a horseshoe shape.

9 is a diagram illustrating various shapes of a plurality of mass bodies in a stock bridge-type cable damper having a plurality of mass bodies on both sides of a connecting member according to a first embodiment of the present invention. FIG. 9 (a) 9 (b) shows a sphere-shaped mass, and Fig. 9 (c) shows a mass-like mass.

In a stock bridge-type cable damper having a plurality of mass bodies on both sides of the connecting member according to the first embodiment of the present invention, a plurality of mass bodies may be formed in a shape of a horseshoe shape, a bell shape ), A spherical shape (Sphere Shape), and the like, and the combination of other mass bodies is of course possible.

Here, the first mass body 230a and the first mass body 230b in the form of a horn are vibrated in two modes of translational motion and rotational motion with respect to the fixing point of the coupling member 220, Shaped second mass body 240 vibrates in one mode of translational motion with respect to the anchor point of the coupling member 220. [

10 is a view illustrating that a connecting member is formed of a spiral steel wire in a cable bridge dam in the form of a stock bridge having a plurality of mass bodies on both sides of the connecting member according to the first embodiment of the present invention, And Fig. 10 (b) is a bottom view.

In the case of a cable bridge dam in the form of a stock bridge having a plurality of mass bodies on both sides of a connecting member according to an embodiment of the present invention, the connecting member 220 may increase the rigidity, It is preferable to provide a spiral steel wire 220b on all or a part of the connecting member.

11A and 11B are diagrams showing a structural analysis model and analysis results for a stock bridge-type cable damper having a plurality of mass bodies on both sides of a joint according to the first embodiment of the present invention, Fig. 11 (b) shows the natural frequency, and Fig. 11 (c) shows the mode shape.

As shown in FIG. 11, the cable bridge of the stock bridge type having a plurality of mass bodies on both sides of the connecting member according to the first embodiment of the present invention shown in FIGS. 7 and 8 has a low vibration frequency of 10 Hz or less, It can be confirmed that the six resonance frequencies are evenly distributed at a high frequency equal to or higher than Hz.

As a result, according to the cable bridge dam of the present invention having a plurality of mass bodies on both sides of the connecting member according to the first embodiment of the present invention, advantages of the damper for one resonance, two resonance and four resonance transmission lines (Vibration reduction in the low vibration frequency band can be solved) while maintaining a low vibration frequency, and it is possible to widely apply to cable structures such as transmission lines and bridges. have.

[Second embodiment: Cable damper (300a, 300b) in the form of eight resonance stock bridges]

Fig. 12 is a view illustrating a plurality of mass bodies formed of a horseshoe-shaped mass body in a stock bridge-type cable damper having a plurality of mass bodies on both sides of a connecting member according to a second embodiment of the present invention, Is a side view, and Fig. 12 (b) is a bottom view.

12, a cable bridge damper 300a having a plurality of mass bodies on both sides of a connecting member according to the second embodiment of the present invention is mounted on a cable of a bridge or a transmission line, The cable damper includes a fixing device 310, a connecting member 320, two first masses 330a, and two second masses 340a, wherein two The first mass body 330a and the two second mass bodies 340a are formed of a mass having a horseshoe shape.

The fixing device 310 is fixed to the outer circumferential surface of the cable, and the connecting member 320 is fixed to the fixing device at a central fixing point to provide stiffness and damping. Here, it is preferable that the connecting member 320 is provided with a spiral steel wire on all or a part of the connecting member to increase rigidity, fatigue and damping performance of the connecting member.

The two first mass bodies 330a are fixedly connected to both sides of the coupling member and vibrate in two modes of translational motion and rotational motion with respect to the fixing point of the coupling member to provide an inertial force against the vibration generated in the cable . In addition, the two second mass bodies 340a are respectively disposed on the outer side of the first mass body and vibrate in two modes of translational motion and rotational motion with respect to the fixing point of the connector. Here, the two first mass bodies 330a and the two second mass bodies 340a are each a horseshoe-shaped mass body vibrating in two modes of translational motion and rotational motion with respect to the fixing point of the linking member, But may be, but not limited to, a mass.

The weight and spacing of the two first mass bodies 330a and the two second mass bodies 340a and the distances between the fixing apparatus 310 and the first and second mass bodies 330a and 330b are It is possible to reduce vibration of 10 Hz or more due to vortex oscillation generated in the cable 100 and to reduce vibration of 10 Hz or less due to galloping or wind vibration.

That is, all the vibrations generated in the cable can be reduced by eight resonance frequencies (8 Resonance) by the two first mass bodies 330a and the two second mass bodies 340a. In addition, a plurality of additional masses each having a predetermined size may be extended on both sides of the two second masses.

FIG. 13 is a diagram illustrating a plurality of mass bodies formed of a mass body in the form of a stock bridge in a cable damper in the form of a stock bridge having a plurality of mass bodies on both sides of a connecting member according to a second embodiment of the present invention, Is a side view, and Fig. 13 (b) is a bottom view.

13, a cable bridge dam 300b having a plurality of mass bodies on both sides of a connecting member according to a second embodiment of the present invention includes a fixing device 310, a connecting member 320, The first mass body 330b and the two second mass bodies 340b, wherein the two first mass bodies 330b and the two second mass bodies 340b are formed into a mass of a bell-shaped mass. Compared with the above-described FIG. 12, the operation is substantially the same, except that the two first mass bodies 330b and the two second mass bodies 340b are formed in a bell shape instead of a horseshoe shape. It is omitted.

FIG. 14 is a diagram showing a structural analysis model and analysis results for a cable bridge dam having a plurality of mass bodies on both sides of a connecting member according to a second embodiment of the present invention. FIG. 14 (a) Fig. 14 (b) shows the natural frequency, and Fig. 14 (c) shows the mode shape.

As shown in FIG. 14, the cable bridge of the stock bridge type having a plurality of mass bodies on both sides of the connecting member according to the second embodiment of the present invention shown in FIGS. 12 and 13 has a low vibration number of 10 Hz or less and 10 It can be seen that the eight resonant frequencies are uniformly distributed at a high frequency equal to or higher than Hz.

As a result, according to the embodiment of the present invention, a stock bridge-type cable damper for reducing various vibrations of a cable, such as a bridge or a transmission line, comprising a plurality of mass bodies for vibration control on both sides of a joint member, All of the cable vibrations having various frequencies such as a high frequency of 10 Hz or more and a low vibration of 10 Hz or less can be reduced.

Further, according to the embodiment of the present invention, since the plurality of mass bodies are vibrated on both sides of the connecting member, the number of vibrations of four or more can be controlled, and the mass, shape and position of the mass body as well as rigidity Since the damping can be adjusted in various ways, the frequency distribution and attenuation characteristics of the cable damper can be easily adjusted. Accordingly, it is possible to control a high frequency such as a high-frequency vortex vibration, as well as a stock bridge damper according to the related art, and to provide a low-frequency vibration such as wind vibration and galloping which can not be controlled by a conventional stock bridge damper All of the cable vibrations can be reduced.

In addition, although a stock bridge damper is used as a countermeasure against vortex oscillation in a transmission line according to the prior art, and an interphase spacer is used for preventing interference between wires caused by galloping, according to the embodiment of the present invention, There is no need to simplify the work process and eliminate the time loss and the additional cost associated with the manufacture and installation of phase spacers.

According to the embodiment of the present invention, it is suitable for reduction of wind-induced vibration such as wind-induced vibration, galloping, and vortex vibration of a bridge cable. For example, in the case of an external cable damper such as an oil damper which is mainly used in a bridge cable according to the related art, a separate support frame must be provided for installing a damper, while a cable damper according to an embodiment of the present invention When applied, there is no need to provide a separate support frame, thereby simplifying the work process and eliminating the time loss and the additional cost of producing and installing the support frame. Further, no load is transmitted to the bridge through the separate support frame.

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
200a, 200b: 6 resonant stock bridge type cable damper
210: Fixing device
220: Connector
230a: a first mass body
230b: a first mass body
240: a spherical second mass body
300a, 300b: 8 resonant stock bridge type cable damper
310: Fixing device
320: Connector
330a: a first mass body
330b: the second mass body
340a: a first mass body
340b: a second mass body

Claims (13)

delete delete delete An asymmetric bridge type cable damper installed on a cable for a bridge or a transmission line to reduce various vibrations generated in the cable,
A fixing device 310 fixed to an outer circumferential surface of the cable 100;
A connecting member (320) fixed to the fixing device at a central fixing point to provide rigidity and damping;
Two first mass bodies fixed to both sides of the coupling member and vibrated in two modes of translational motion and rotational motion with respect to an anchor point of the coupling member to provide an inertial force for vibration generated in the cable; And
And two second mass bodies disposed on the outer side of the first mass body and vibrated in a translational motion mode with respect to a fixing point of the connecting member,
Wherein vibration generated in the cable is reduced by six resonant frequencies (6 Resonance) by the two first mass bodies and the two second mass bodies, characterized in that a stock bridge-like shape having a plurality of mass bodies on both sides of the connecting member Cable damper. 5. The method of claim 4,
The connecting member may be provided with a spiral steel wire on all or a part of the connecting member so as to increase the rigidity, fatigue and damping performance of the connecting member,
A plurality of additional masses each having a predetermined size may be extended and installed on both sides of the second mass body,
Characterized in that the cable is a cable of a cable-stayed bridge, a hanger cable of a suspension bridge, or a cable of a transmission line, wherein the cable damper has a plurality of mass bodies on both sides of the connecting material. 5. The method of claim 4,
Characterized in that the two first mass bodies are either a horseshoe-shaped mass body (330a) oscillating in two modes of translational motion and rotational motion with respect to the anchorage point of the connecting member or a mass body (340a) of a bell-shaped mass. A cable damper in the form of a stock bridge having a plurality of mass bodies. The method according to claim 6,
The weight and spacing of each of the two first mass bodies and the two second mass bodies, and the distance between the securing device and the first and second mass bodies, respectively, A cable damper of a stock bridge type having a plurality of mass bodies on both sides of a connecting member, characterized in that vibration of a frequency is reduced and vibration of a low vibration frequency of 10 Hz or less is reduced by galloping or wind vibration. 5. The method of claim 4,
The connecting member (320) is provided with a spiral steel wire on the whole or a part of the connecting member so as to increase the rigidity, fatigue and damping performance of the connecting member. A stock bridge- Damper. 9. The method of claim 8,
The cable damper according to claim 1, wherein the connecting member is provided with a spiral steel wire on all or a part of the connecting member so as to increase rigidity, fatigue and damping performance of the connecting member. 5. The method of claim 4,
Characterized in that the cable (100) is a cable of a cable-stayed bridge, a hanger cable of a suspension bridge, or a cable of a transmission line, wherein the cable (100) has a plurality of mass bodies on both sides of the cable. An asymmetric bridge type cable damper installed on a cable for a bridge or a transmission line to reduce various vibrations generated in the cable,
A fixing device 310 fixed to an outer circumferential surface of the cable 100;
A connecting member (320) fixed to the fixing device at a central fixing point to provide rigidity and damping;
Two first mass bodies fixed to both sides of the coupling member and vibrated in two modes of translational motion and rotational motion with respect to an anchor point of the coupling member to provide an inertial force for vibration generated in the cable; And
And two second mass bodies disposed on the outer side of the first mass body and vibrating in two modes of translational motion and rotational motion with respect to the fixing point of the connection member,
Wherein the vibration generated in the cable is reduced by eight resonance frequencies (8 resonance) by the two first mass bodies and the two second mass bodies, and a stock bridge-like shape having a plurality of mass bodies on both sides of the joint member Cable damper. 12. The method of claim 11,
The two first mass bodies and the two second mass bodies are each a horseshoe-shaped mass body (330a, 330b) vibrating in two modes of translational motion and rotational motion with respect to anchorage point of the connecting member, And 340b. The cable damper of the stock bridge type has a plurality of mass bodies on both sides of the connecting member. 12. The method of claim 11,
The connecting member (320) is provided with a spiral steel wire on the whole or a part of the connecting member so as to increase the rigidity, fatigue and damping performance of the connecting member. A stock bridge- Damper.

Images