• Title, Summary, Keyword: 레일안정성

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An Automated Machining System for Steel Flat Bar Plasma Cutting in the Small Sized Shipbuilding Industry (중소조선용 철의장 가공자동화시스템 개발)

  • Ryu, Gab-Sang;Lee, Won-Hoo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.2
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    • pp.852-857
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    • 2011
  • The shipbuilding industry needs automation and mechanization to solve reduction of skilled workers and labor shortage. Ship manufacturing process is the lack of automation than standardized manufacturing field. In this paper, we design and development an process automation system for hand rail production. Mechanical parts of the cutting process was designed with efficiency, productivity and reliability, CATIA and ANSYS, the stability of the mechanical structure was confirmed. System control using a PCNC controller to provide an open and scalable, and operate using touch-screen display control and monitoring of the system was performed. The automatic system successfully passed the driving test and processing test, and it showed an excellent performance.

Dynamic Analysis of Wheel-Rail High Speed Train Propelled by Superconducting Linear Synchronous Motor (초전도 선형동기전동기 추진 휠-레일 고속열차의 동특성 분석)

  • Lee, Jin-Ho;Lee, Chang-Young;Jo, Jeong-Min;Han, Young-Jae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.1
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    • pp.119-125
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    • 2016
  • This study examined the running dynamic characteristics of a hybrid type wheel-rail high speed train, in which the propulsion method of maglev is applied. A wheel-rail high speed train propelled by a superconducting linear synchronous motor (SC-LSM) is expected to be superior to a maglev train regarding economical and interoperable aspects, still having powerful thrust force as maglev. In this paper, regarding the two methods of applying the SC-LSM to an existing wheel-rail train, to investigate the influences of SC-LSM propulsion on the dynamic characteristics of wheel-rail high speed train, the dynamic model of train including interaction between the rotor and stator of SC-LSM is established. Through the simulation using the model, the influence of the interaction between the rotor and stator of SC-LSM on stability, ride comfort and the effect of guideway irregularity are investigated.

A Behavior Analysis of HSR Concrete Slab Track under Variety of Rail Pad Static Stiffness on Fatigue Effect (피로효과를 고려한 레일패드의 정적스프링계수 변화에 따른 콘크리트 슬래브 제도의 거동분석)

  • Park, Yong-Gul;Kang, Kee-Dong;Choi, Jung-Youl
    • Journal of the Korean Society for Railway
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    • v.10 no.5
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    • pp.499-505
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    • 2007
  • The major effective of this study is to investigate the fatigue effects of rail pad on High Speed Railway with concrete slab track system. It analyzed the mechanical behaviors of HSR concrete slab track with applying rail pad stiffness based on fatigue effect (hardening and increasing stiffness) on the 3-dimensional FE analysis and laboratory test for static & dynamic characteristics. As a result, the hardening of rail pad due to fatigue loading condition are negative effect for the static & dynamic response of concrete stab track which is before act on fatigue effect. The analytical and experimental study are carried out to investigate rail pad on fatigue effected increase vertical acceleration and stress and decrease suitable deflection on slab track. And rail pad based on fatigue effect induced dynamic maximum stresses, the increase of damage of slab track is predicted by adopting fatigue effected rail pad. after due consideration. The servicing HSR concrete slab track with resilient track system has need of the reasonable determination after due consideration fatigue effect of rail pad stiffness which could be reducing the effect of static and dynamic behavior that degradation phenomenon of structure by an unusual response characteristic and a drop durability.

A Study on Monitoring of Mitigation of Rail Corrosion using Sacrificial Anode Cathodic Protection Method (희생양극법을 적용한 철도 레일의 방식효과 모니터링 연구)

  • Choi, Jung-Youl;Park, Jong-Yoon;Lee, Kyu-Yong;Chung, Jee-Seung
    • The Journal of the Convergence on Culture Technology
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    • v.5 no.4
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    • pp.367-371
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    • 2019
  • In this study, we proposed the sacrificial anode cathodic protection method as a countermeasure to reduce the corrosion of railway rails under oceanic climatic conditions and proved the anticorrosive effect experimentally. In addition, the proposed sacrificial anode cathodic protection method were tested on site to examine long-term rail corrosion monitoring and field applicability for more than 26 months and to prove the effectiveness of rail corrosion. As a result of monitoring the corrosion state using the cellophane tape method, the appearance of the applied sections with sacrificial anode cathodic protection method was good at the present time about 26 months after the field test laying, and no abnormalities and other abnormalities of the rail welded section and the rail web were found. Hence, in places where no sacrificial anodes were installed, rust progressed rapidly. In addition, the proper spacing of sacrificial anodes was found to form the most stable corrosion coating at 1.0 ~ 1.5m. After about 26 months of monitoring, the installation of sacrificial anodes could help stabilize the overall rail corrosion level, even if the spacing was somewhat wider.

상전도 자기부상열차의 주행모듈 개발

  • 임달호
    • 전기의세계
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    • v.39 no.5
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    • pp.68-75
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    • 1990
  • 급속한 경제발전과 이에 대응한 교통인구의 증가로 운송시스템의 속도 경쟁은 날로 심화되고 있다. 그러나, 기존의 차륜구동 시스템은 본질적으로 궤도와 차륜의 마찰에 의하여 추진력을 얻기 때문에 평균 최대속도 250Km/h(상한 최대속도 350Km/h)수준이며 소음, 진동 등의 많은 문제점이 있다. 이러한 단점을 극복하기 위하여 선진 외국에서는 부상식 열차의 개발에 관심을 표명하여 1960년대 후반부터 열차와 공기부상식 열차에 대한 연구를 병행하였다. 1970년대 중반까지 프랑스, 영국, 미국 등에서 개발이 진행된 공기 부상식 열차는 고속 주행 및 환경 문제 등에 문제점이 많아 실용화에는 이루지 못하고 신교통 시스템에 부분적으로 적용되고 있는 실정이다. 그러나 자기부상 열차는 Power Electronics 및 자기관련 기술의 급속한 발전에 힘입어 현재 실용화 단계에 이르고 있다. 특히 자기부상(Magnetic Levitation : Maglev) 시스템은 레일과의 마찰력에 의해 추진하는 방식이 아니기 때문에 본질적으로 고속성, 무공해, 안정성, 신뢰성, 경제성 그리고 승차감이 뛰어나다. Maglev는 레일 표면에서 자력을 이용해서 약 1.0cm 또는 10cm 가량 부상한 상태에서 주행하기 때문에 외부와의 물리적인 접촉이 필요 없어 마찰에 의한 소음, 공해, 마모 등이 없는 대단히 이상적인 미래의 운송 수단으로 각광을 받고 있다.

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Longitudinal Static Stability of Wings Flying Over Nonplanar Ground Surfaces (비평면 지면효과를 받는 날개들의 종방향 정안정성)

  • 김학기;조진수;한철희
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.34 no.7
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    • pp.12-17
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    • 2006
  • Longitudinal static stability and steady aerodynamic characteristics of wings flying over nonplanar ground surfaces (rail and channel) are investigated using the boundary-element method. For a channel with it's fence higher than the wing height, the lift and the nose-down pitching moment increase as the gap between the wingtip and the fence decreases. For a rail with it's width wider than the wing span, the lift and the nose-down pitching moment increase as the rail height decreases. Longitudinal static stability of a single wing flying over nonplanar surfaces is worse than the case of the flat ground. In case of tandem wings, longitudinal static stability of the wings flying over the channel is better than the case of the flat ground. It is believed that the present results can be applied to the conceptual design of high-speed ground transporters.

Shape Optimization for a Jaw Using DOE (실험계획법을 이용한 조(Jaw)의 형상최적설계)

  • Lee Kwon-Hee;Bang Il-Kwon;Han Dong-Seop;Han Geun-Jo
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.331-336
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    • 2006
  • The rail clamp is the device to prevent that a crane slips along rails due to the wind blast as well as to locate the crane in the set position for loading and unloading containers. The wedge type rail clamp should be designed to consider the structural instability and the durability because it compresses both rail side with large clamping force by the wedge working as the wind speed increases. In this research, there are two methods which are design of experiment and variation technology in used commercial software and shape optimization was performed. The optimum results obtained by the two methods are compared and examined.

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Shape Optimization for a Jaw Using Design Of Experiments (실험계획법을 이용한 조(Jaw)의 형상최적설계)

  • Bang, Il-Kwon;Kang, Dong-Hun;Han, Dong-Seop;Han, Geun-Jo;Lee, Kwon-Hee
    • Journal of Navigation and Port Research
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    • v.30 no.8
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    • pp.685-690
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    • 2006
  • The rail clamp is the device to prevent that a crane slips along rails due to the wind blast as well as to locate the crane in the set position for loading and unloading containers. The wedge typed rail clamp should be designed to consider the structural stability and the durability because it compresses both rail side with large clamping force by the wedge working as the wind speed increases. In this research, the design of experiments(DOE) and the variation technology(VT) built in ANSYS WORKBENCH are utilized to determine the optimum shape of a jaw. The optimum results obtained by two methods are compared and examined.

Analytical and Experimental Study on the Quality Stability of Multi Roll Forming Process (멀티 롤 포밍 공정의 품질 안정성에 대한 해석 및 실험적 연구)

  • Son, Jae-Hwan;Han, Chang-Woo;Ryu, Kyung-Jin;Kang, Hae-Dong;Kim, Chul-Hong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.10
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    • pp.6977-6984
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    • 2015
  • It is faced with the necessity of multi roll forming process of the ball slide rail which is made by adding the separate manufacturing processes, piercing, bending, trimming, to the roll forming process of a continuous plastic deformation, to improve the quality. However, the vibration and noise of the press machine in this process leads to the quality degradation of slide rail manufactured in this process. In this study, the roll was designed considering the optimal strain rates by the roll forming program with finite element method. And to estimate the static stability of the multi process the Von-Mises stress and deformation on the press was calculated with a structural analysis program. Also, to avoid driving systems in the resonance region their natural frequencies in the 1st and 2nd mode were calculated through the modal analysis. To verify its dynamic stability improvement the magnitudes of noise and vibration in the existing and studied system were compared using a microphone and accelerometers. And the widths and surface roughnesses of the rails which had been produced in the existing and studied process were measured. Therefore, it is known that multi roll forming process is stable in the analytical and experimental study.

Structural Optimization for a Jaw Using the Kriging model (이단계 크리깅 모델을 이용한 조(Jaw)의 구조최적설계)

  • Lee, Kwon-Hee;Bang, Il-Kwon;Kang, Dong-Hun;Han, Dong-Seop;Han, Geun-Jo
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.2
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    • pp.143-147
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    • 2006
  • The rail clamp is the device to prevent that a crane slips along rails due to the wind blast as well as locate the crane in the set position for loading and unloading containers. The wedge type rail clamp should be designed to consider the structural stability and the durability because it compresses both rail side with large clamping force by the wedge working as the wind speed increases. In this research, the kriging interpolation method using sequential sampling is utilized to find the optimum shape of the jaw in the rail clamp. The suggested method predicts more accurate response value than the response surface method. The optimum results obtained by the proposal method are compared with those by the commercial software.

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