• Title/Summary/Keyword: OF Cable

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Dynamic Response of 3-D Cable-Stayed Bridge Considering the Sway Vibrational Effect of Stays (케이블 횡진동을 고려한 3차원 사장교의 동적거동)

  • 성익현
    • Journal of the Korean Society for Railway
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    • v.2 no.3
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    • pp.36-45
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    • 1999
  • The basic idea of cable-stayed girder bridges is the utilization of high strength cables to provide intermediate supports for the bridge girder so that the girder can span a much longer distance. In the cable-stayed bridge, the cables exhibit nonlinear behavior because of the change in sag, due to the dead weight of the cable, which occurs with changing tension in the cable resulting from the movement of the end points of the cable as the bridge is loaded. Techniques required for the static analysis of cable-stayed bridges has been developed by many researchers. However, little work has been done on the dynamic analysis of such structures. To investigate the characteristics of the dynamic response of long-span cable-stayed bridges due to various dynamic loadings likes moving traffic loads. two different 3-D cable-stayed bridge models are considered in this study. Two models are exactly the same in structural configurations but different in finite element discretization. Modal analysis is conducted using the deformed dead-load tangent stiffness matrix. A new concept was presented by using divided a cable into several elements in order to study the effect of the cable vibration (both in-plane and swinging) on the overall bridge dynamics. The result of this study demonstrates the importance of cable vibration on the overall bridge dynamics.

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Vibrations of a taut horizontal cable subjected to axial support excitations considering nonlinear quasi-static responses

  • Jiang Yi;Yingqi Liu
    • Structural Engineering and Mechanics
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    • v.86 no.2
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    • pp.221-235
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    • 2023
  • To calculate the vibrations of a tout cable subjected to axial support excitations, a nonlinear relationship of cable force and the support displacement under static situations are employed to depict the quasi-static vibration of the cable. The dynamic components of quasi-static vibration are inputted as "direct loads" to cause the parametric vibrations on the cable. Both the governing equations of motion and deformation compatibility for parametric vibrations are then derived, which indicates the high coupling of cable parametric force and deformation. Numerical solutions, based on the finite difference method, are put forward for the parametric vibrations, which is validated by the finite element method under periodic axial support excitations. For the quasi-static response, the shorter cables are more sensitive to support excitations than longer ones at small cable force. The quasi-static cable force makes the greatest contribution to the total cable force, but the parametric cable force is responsible for the occurrence of cable loosening at large excitation amplitudes. Moreover, this study also revealed that the traditional approach, assuming a linear relationship between quasi-static cable force and axial support displacement, would result in some great error of the cable parametric responses.

Automated Cable Route Design based Flexible Cable Fill Check of Raceway in Cable Spreading of Generating Station (발전소 케이블 포설에서 Raceway의 유연한 케이블 Fill 체크 기반 자동화된 케이블 라우팅 설계)

  • Park, Ki-Hong;Lee, Yang Sun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.3
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    • pp.607-614
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    • 2016
  • In generating station, cable spreading design is a very important task, which is very much time consuming, due to the type of cable used in generating station is very diverse. The raceway means the cable line section from source equipment to destination, and consists of cable tray and conduit. The process of existing cable spreading design was written in by hand. Thereby, there are grossly inefficient gain such as cable omission and unfixed fill value by a personal and time investment. In this paper, we proposed and implemented the automated cable route design based flexible cable fill check in generating station, and proposed the automated cable route design can be calculated the cable fill with flexible changing of raceway. Some experimental result shows that implemented cable route design is well performed and conducted as the design specifications, and it will be able to reduce the cable spreading design time.

Implementation of the route Visualize of Ship in 3D CAD (3D CAD에서 선박의 Cable 경로 가시화 구현)

  • Kim, Hyeon-Jae;Kim, Bong-Gi
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.05a
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    • pp.259-261
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    • 2016
  • Cable is very essential material for ship operation as connecting element for whole electrical facilities of ship. The material cost and installation man-hour increment caused by re-installation is unavoidable if cable route has some problem. The purpose of this study is to suggest methods to implement the cable visualization functionality for verifying whether cable route is accurate or not in design phase. This functionality is conducted by representing color of 3D model for strong visibility by refer to textual cable routing information. The electrical engineer can provide cable route information more accurate and on time for cable installation department. As a result, the material cost and installation man-hour reduce due to decreasing ratio of re-installation.

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Investigation of On-line Monitoring Method on 1500 V Direct Current Cable of Subway

  • Shen, Xiaojun;Jiang, Xiuchen;Yi, Zeng
    • Transactions on Electrical and Electronic Materials
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    • v.7 no.5
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    • pp.247-251
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    • 2006
  • The traction DC feeder cable is one of the key devices for the safety operation of subway system, but for low voltage DC feeder cable (<3000 V) for subway, little attention has been paid by investigators on its online monitoring technology. With an introduction of cable laying and operation environment for the cable, this paper investigated the on-line monitoring technology of 1500 V DC feeder cable of subway. Firstly, in the text, the fault model of 1500 V DC cable was proposed based on the analysis of the fault type of the DC feeder cable, and then put forward synthetically on-line monitoring discharge signal and DC leakage current signal to assess DC feeder cable insulating state. The results of laboratory experiment prove that the proposed methods are feasible and can be implemented on-line monitor on DC feeder cable of subway.

Measurement of electrical resistance at the Nb_{3}$Sn CICC joint fabricated by sub-cable to sub-cable joining (Nb_{3}$Sn 초전도 CICC의 sub-cable to sub-cable 접합 및 접합저항 측정)

  • 이호진;홍계원;김기백;권선칠;김기만
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 1999.02a
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    • pp.89-92
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    • 1999
  • A small scale joint sample of Nb3Sn CICC was fabricated by sub-cable to sub-cable joining. This joint was produced by parallel insertion of one end of each sub-cable into the sub-cable space of the other side of cable, which can decrease the equivalent electrical resistance at the joint is expected to have average properties, dc resistance and ac losses, in view of the shapes of ITER type joint and strand to strand joint. The 3.8nOhm of dc resistance was measured in the range of 10-200A transport current. The normalized resistivity of the joint was about 6.7 $\mu}$Ohm-$^mm{2}$. Considering the normalized resistivity, the full scale joint prepared by sub-cable to sub-cable joining may have similar joint dc resistance with other conventional full scale joints with a shorter joining length.

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First Installation of High Stress EHV XLPE Cable in korea (초고압 고내력 케이블 국내 최초 현장 적용)

  • Oh, J.O.;Cho, S.H.;Lee, S.K.;Kim, H.J.;Oh, D.S.
    • Proceedings of the KIEE Conference
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    • 1999.11d
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    • pp.1057-1059
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    • 1999
  • Recently, increased demand of electrical energy caused additional installation of underground power cable, Industrialization of metro makes civil works difficult. So installed ducts became a key of underground power transmission, LG cable set to work development of high stress cable. LG cable stated in 1996, got a certificate of type test in 1998, and applied at domestic site in Nov. 1999. High stress cable has some merit, decrease of civil cost, reduction of work time, by reason of decrease of dia. and weight, and economical system design, so LG cable has a good merit in comparison with competitive company in domestic and foreign market.

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Development of Cable Lug Joint Using Electromagnetic Force (전자기력을 이용한 케이블 러그 조인트 개발)

  • Shim, Ji-Yeon;Kang, Bong-Yong
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.22 no.1
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    • pp.156-161
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    • 2013
  • Recently, there has been a trend in the manufacturing process to focus on the durability of cable lug joint, especially in welding process due to the poor cable lug joint causes many troubles on products and workers during manufacturing process. Therefore development of high quality cable lug joint is important for successful manufacturing process and safety of worker. The Magnetic Pulse Forming(MPF) is one of efficient way to developed a high quality cable lug joint. In MPF, a high strain rate forming process, utilizes a high velocity oblique collision on the workpiece to be formed in required shape. The objective of this paper is to develop of high quality cable lug joint using electromagnetic force. To successfully accomplish this goal, section and electrical contact temperature of developed cable lug joint has been compared with various cable lug joint. Electrical contact temperature of developed cable lug joint by electromagnetic force is lower than manufactured cable lug joint by pressurer and hydraulic pressurer.

An Installation of 154kV XLPE CABLE in Steep Slope Condition (고낙차 조건에서의 154kV XLPE CABLE 설치)

  • Hwang, Soon-Chul;Lee, Chang-Su;Lee, Cheon-Ku;Goh, Chang-Sung
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.775-778
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    • 1992
  • In 1980, 154kV OF cable was installed at the Cheong-Pyeong pumped-storage power station. Effective head of this pumped-storage station is 250m between upper and lower re-servior and length of cable route is 750m. However, several failures have happened owing to steep slope during the operation. 154 kV XLPE cable was applied for this power station to eliminate a lack of stability on account of steep slope and successfully installed in 1991. Meanwhile, installation procedure brings about many problem to be solved. In this paper, we describe the counter measure of cable sliding phenomena caused by heat shrinkage as well as the method of installation of cable under the steep slope condition. And hereafter, we think this paper will be a good reference to design and installation of 154kV XLPE cables in steep slope turnnel at urban areas.

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A Study on the Stabilizing Process and Structural Characteristics of Cable-Dome Structure (케이블돔 구조물의 안정화 이행과정 및 구조적 거동특성에 관한 연구)

  • 한상을;이경수;이주선;황보석
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 1999.04a
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    • pp.260-267
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    • 1999
  • In this paper, We propose the initial shape finding and dynamic analysis of cable dome structure are presented. Cable dome that is consist of three component such as cable, strut and fabric membrane have complex structural characteristics. Main structural system of cable dome is cable-strut tensegric system, and fabric membrane element Is conceived as cladding roof material. One of the important problem of cable dome is shape finding of those subjected to cable and membrane forces, which stabilize the structures. And the other is structural response from external load effect such as snow and wind When cable dome are subjected to dynamic load such as wind load each structural component has many important problem because of their special structural characteristics. One problem is that geometrical nonlinearity should be considered in the dynamic analysis because large deformation is occurred from their flexible characteristic. The other problem is that wrinkling occurs occasionally because cable and membrane elements can not transmit compressive forces. So this paper describe the physical structural response of cable dome structure.

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