• Title/Summary/Keyword: One-wire

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Effect of Shielding gas Composition on Arc Stability and Transfer mode of High deposition GMA Welding (고용착 GMA 용접의 Arc 안정성 및 용적이행 현상에 미치는 보호gas의 영향)

  • 경규담;천홍정;이정헌;강봉용;김희진
    • Journal of Welding and Joining
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    • v.15 no.1
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    • pp.109-115
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    • 1997
  • The arc stability and the metal transfer mode of high deposition GMA welding were investigated using various compositions of shielding gas with two types of filler, ie solid wire and metal cored wire. As for a solid wire, the transfer mode changed from axial spray to rotational spray with increasing wire feed rate (welding current) and the transition current was different with the gas composition. The gas composition also affected the apparent stability of rotating arc. As for a metal cored wire, on the other hand, no transition occurred and thus spray transfer mode could be applied with the welding current over 500A (deposition rate over 300g/min). Looking for the development of high deposition GMA welding process, above results were discussed in two different ways, one is to elevate the transition current, the other is to stabilize the rotational transfer mode.

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Performance and Evaluation of the Messenger Wire stranded by Copper-Clad Steel Conductors for High Speed Electric Railway (동복강선을 적용한 고속선용 조가선의 성능 및 평가 방안)

  • Lee, Chang-Young;Baek, Seung-Koo;Kwon, Sung-Tae;Kim, Jeong-Guk;Chang, Sang-Hoon
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.875-880
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    • 2007
  • Due to increasing demands for environment-friendly railway system, bronze wires with cadmium, which is a potential environmental hazard, have been no longer permitted as messenger wire for electric railway system. One of materials being considered as the replacements is copper-clad steel conductor(CCSC), which is currently used as contact wire for high speed operation in the Japanese shinkansen. However, there have been few studies for the application as messenger wire by the CCSC. This study deals with requirements and performances of the messenger wire stranded by the CCSC, especially for high speed electric railway. And the tentative evaluation items and methods to be specified as the Korean railway standard(KRS) are proposed.

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A Machine Vision Algorithm for Inspecting a Crimpled Terminal (압착단자의 자동검사를 위한 시각인식 알고리즘)

  • Lee, Moon-Kyu;Lee, Jung-Hwa
    • IE interfaces
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    • v.11 no.1
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    • pp.191-197
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    • 1998
  • This paper describes a machine vision algorithm for inspecting a crimpled terminal. The crimpled terminal is one of wire harness assemblies which transmit current or signals between a pair of electrical or electronic assemblies. The major defect considered is wire exposure on wire barrels. To detect the wire exposure, we develope a multi-layer perceptron in which three features extracted from the image of the crimpled terminal are used as input data. The three features are edginess, variance, and total number of valley points(TVP). The multi-layer neural network has been successfully tested on a number of real specimens collected from a wire-harness factory.

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Thermal-Hydraulic Analysis of A Wire-Spacer Fuel Assembly

  • Ahmad, Imteyaz;Kim, Kwang-Yong
    • 유체기계공업학회:학술대회논문집
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    • 2004.12a
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    • pp.473-478
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    • 2004
  • This work presents the Thermal Hydraulic analysis has been performed for a 19-pin wire-spacer fuel assembly using three-dimensional Reynolds-averaged Navier-Stokes equations. SST model is used as a turbulence closure. The whole fuel assembly has been analyzed for one period of the wire-spacer using periodic boundary condition at inlet and outlet of the calculation domain. The overall results far a preliminary calculation show a good agreement with the experimental observations. It has been found that the major unidirectional flows are the axial velocity in sub-channels and the peripheral sweeping flows and the velocities are found to be following a cyclic path of period equal to the wire-wrap pitch. The temperature is found to be maximum in the central region and also, there exist a radial temperature gradient between the fuel rods. The major advantage of performing this kind of analysis is the prediction of thermal-hydraulic behavior of a fuel assembly with much ease.

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A Development of Advanced Wiring Harness Design System for a Vehicle (자동차 전장설계 옵션별 출도 및 관리시스템 개발)

  • 김원중;이수홍
    • Korean Journal of Computational Design and Engineering
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    • v.8 no.3
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    • pp.184-188
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    • 2003
  • The harness design process consists of repetitious routines to decide the wire configuration in its interior. A slight change in one of the wire's configuration will require a total reconfiguration of the entire wire system. Therefore, the harness design is extremely time consuming and is vulnerable to human errors by an engineer. Based on both electrical and mechanical area, Wiring Harness system is in complicated area. Existing systems are, therefore, not exactly suitable for practical use. This paper presents a novel framework for ameliorating existing system's defects. In this paper, Visio and Visual Basic was interfaced to process wire bundle information and wire bundle location to alleviate problems mentioned beforehand concerning harness design; at the same time developing the automation of the entire design process based on the feature based design method, optional print, and management of documents for reuse.

Robust Control of Vibration Using shape memory alloy actuator (형상기억합금 액추에이터를 이용한 강건한 진동제어)

  • ;Koval, L. R.
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.1
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    • pp.263-270
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    • 1995
  • The use of the shape memory alloy, Nitinol wire, is investigated as an actuator for enhancing the damping in structural vibration systems. The first-order mathematical model of the Nitinol wire is obtained from the experimental data for an actuator. Finite element method is utilized for the strain gage sensor model, which is installed at the root of cantilever beam. A simple system, cantilever beam, is built as a flexible structural system to implement a control law with the Nitinol wire actuator. The system model including sensor and actuator is derived, which agrees with the experimental results. The actuator dynamics is augmented with the system so as to design PI controller and the one of robust controllers, LQG/LTR controller, and the control laws are implemented experimentally. The experimental study shows the feasibility of utilizing the Nitinol wire as an actuator for the purpose of vibration control.

Study of termite damage to high voltage power cable and its prevention (고압 전력 케이블에서의 흰개미 피해 방지 대책에 관한 고찰)

  • Kim, J.W.;Kim, J.J.;Choi, B.N.;Jeon, M.S.;Kang, D.G.
    • Proceedings of the KIEE Conference
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    • 1994.07b
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    • pp.1643-1645
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    • 1994
  • It has been reported frequently that damage to underground electric power cable was brought about, due to attack by Insect such as termite (white-ant) and by rodent such as rat, in tropical and semitropical areas. Among these cable damages, we are likely to describe the damage to cable by termites as causing the severe trouble in cable operation and to solve this trouble with termite-proof method regarded as the most effective and economical one. This report covers our experiences of manufacturing the cable for anti-termite purpose and its intrinsic properties in cable operation.

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Comparison between Two Kirschner Wire Fixation and Three Wire Fixation, in Treating of Metacarpal Neck Fracture Using Multiple Retrograde Kirschner Wire Fixation (다발성 역행성 K 강선을 이용한 중수골 경부 골절의 치료에서 2개의 강선과 3개의 강선 사용군의 비교)

  • Kwak, Sang-Ho;Lee, Young Ho;Seo, Gil Joon;Baek, Goo Hyun
    • Journal of Trauma and Injury
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    • v.28 no.2
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    • pp.55-59
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    • 2015
  • Purpose: To compare clinical and radiographic outcomes of between two and three Kirschner wire(K-wire) intramedullary fixation for fractures in the neck of the metacarpal bone. Methods: A single institutional retrospective review identified 28 cases of metacarpal fractures between March 2010 and August 2014. Each of the cases met the inclusion criteria for closed, extra-articular fractures of the neck of the metacarpal bone. The patient groups were divided by the number of K-wire. Outcomes were compared for range of motion of the metacarpophalangeal joint, radiographic parameters, and period until union. Results: The fractures were treated with either 2 Kirschner wire fixation (n=10) or 3 Kirschner wire fixation (n=18). The active range of motion of metacarpophalangeal joint and radiographic result showed no statistically significant difference between the two groups. The mean union period was 5.9 weeks. However, four cases suffered distal head perforation in 2 K-wire fixation group and one case in 3 K-wire fixation group. Conclusion: Multiple retrograde intramedullary Kirschner wire fixation is a good treatment of choice for fractures in the neck of the metacarpal bone. To prevent metacarpal head perforation, it is preferred to use three K-wires than two K-wires.

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A Suggestion for Improvement of Tension Balancer in Trolly Wire System (전차 선로 자동 장력 조정 장치의 개선 방안)

  • Yim Geum-Kwang;Yoon Yong-Han
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.1328-1333
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    • 2004
  • This paper presents a suggestion for improvement of tension balancer in trolly wire system. In the overhead trolly wire systems, one of the most things is tension balancer. Because it can be automatically adjusted tension for expansion and contraction of overhead catenary system. In this paper, we introduce and suggest spring tension balancer(STB).

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MECHANISM OF NUCLEATE BOILING HEAT TRANSFER FROM WIRES IMMERSED IN SATURATED FC-72 AND WATER (전열면적 및 유체의 종류가 핵비등 열전달에 미치는 영향과 그 원인)

  • Kim, J.H.;You, S.M.;Park, J.Y.
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.232-239
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    • 2001
  • The present study is an experimental investigation of nucleate boiling heat transfer mechanism in pool boiling from wire heaters immersed in saturated FC-72 coolant and water. The vapor volume flow rate departing from a wire during nucleate boiling was determined by measuring the volume of bubbles, varying $25{\mu}m,\;75{\mu}m,\;and\;390{\mu}m$, from a wire utilizing the consecutive-photo method. The effects of the wire size on heat transfer mechanism during a nucleate boiling were investigated by measuring vapor volume flow rate and the frequency of bubbles departing from a wire immersed in saturated FC-72. One wire diameter of $390{\mu}m$ was selected and tested in saturated water to investigate the fluid effect on the nucleate boiling heat transfer mechanism. Results of the study showed that an increase in nucleate boiling heat transfer coefficients with reductions in wire diameter was related to the decreased latent heat contribution. The latent heat contribution of boiling heat transfer for the water test was found to be higher than that of FC-72. The frequency of departing bubbles was correlated as a function of bubble diameters.

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