• Title/Summary/Keyword: 안내레일

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Study on Running Safety of EMS-Type Maglev Vehicle Traveling over a Switching System (상전도흡인식 도시형 자기부상열차의 분기기 주행안전성 연구)

  • Han, Jong-Boo;Lee, Jong Min;Han, Hyung-Suk;Kim, Sung-Soo;Yang, Seok-Jo;Kim, Ki-Jung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.11
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    • pp.1309-1315
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    • 2014
  • The switch for a maglev vehicle should be designed such that the vehicle safely changes its track without touching the guiderail. In particular, a medium-to-low-speed EMS -type maglev train relies heavily on a U-type electromagnet where it generates levitation force and guidance force simultaneously. Therefore, it is necessary to evaluate the safety of the vehicle whenever it passes the switch, as it lacks active control of the guidance force. Furthermore, when the vehicle passes a segmented switch, which is a group of curves made up of connected lines with a small radius of curvature, it may come into mechanical contact with the guiderail owing to the excessive lateral displacement of the electromagnet. The goal of this study is to analyze the influence of a segmented switch on the safety of major design-related variables for achieving improved running safety. We propose a three-dimensional multibody dynamics model composed of two cars with one body. Using the proposed model, we perform a simulation of the lateral air gap, which is one of the measurements of the running safety of the vehicle when it passes the switch. The analyzed design variables are the length between short span girder, the articulation angle, the length between two centers of a fixed girder at its ends, and the number of girders. On the basis of the effects of the considered design variables, we establish an optimized design of a switch with improved safety.

Parallelism and Straightness Measurement of a Pair of Rails for Ultra Precision Guide-ways (초정밀 안내면 레일의 평행도 및 진직도 동시측정)

  • Hwang, Joo-Ho;Park, Chun-Hong;Wei, Gao;Kim, Seung-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.3 s.192
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    • pp.117-123
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    • 2007
  • This paper describes a three-probe system that can be used to measure the parallelism and straightness of a pair of rails simultaneously. The parallelism is measured using a modified reversal method, while the straightness is measured using a sequential two-point method. The measurement algorithms were analyzed numerically using a pair of functionally defined rails to validate the three-probe system. Tests were also performed on a pair of straightedge rails with a length of 250 mm and a maximum straightness deviation of $0.05{\mu}m$, as certified by the supplier. The experimental results demonstrated that the parallelism-measurement algorithm had a cancellation effect on the probe stage motion error. They also confirmed that the proposed system could measure the slope of a pair of rails about $0.06{\mu}rad$. Therefore, by combining this technique with a sequential differential method to measure the straightness of the rails simultaneously, the surface profiles could be determined accurately and eliminate the stage error. The measured straightness deviation of each straight edge was less than $0.05{\mu}m$, consistent with the certified value.

Improvement of Motion Accuracy Using Transfer Function in Linear Motion Bearing Guide (전달함수를 이용한 직선베어링 안내면의 운동정밀도 향상)

  • Kim, Kyung-Ho;Park, Chun-Hong;Lee, Hu-Sang;Kim, Seung-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.6
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    • pp.77-85
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    • 2002
  • An analysis method which calculates corrective machining information for improving the motion accuracy of linear motion guide Is proposed in this paper. The method is composed of two algorithms. One is the algorithm fur prediction of the motion errors from rail form error. The other is the algorithm for prediction of rail form error from the motion errors of table. Transfer function is utilized in each algorithm, which represents the ratio of bearing reaction force variation to unit magnitude of spatial frequencies of raid from error. As the corrective machining information is acquired from the measured motion errors of table, the method has a merit not to measure rail form error directly. Validity of the method is verified both theoretically and experimentally. By applying the method, linear motion error of test equipment is reduced from 5.97$\mu$m to 0.58$\mu$m, and reduced from 32.78arcsec to 6.21 arcsec in case of angular motion error. From the results, it is confirmed that the method is very effective to improve the motion accuracy of linear motion guide.

Dynamic Analysis of Impact Force Alleviation of Industrial Folding-type Automatic Door on Guide Rail (산업용 접이식 자동문 안내레일에 작용하는 충격하중 완화를 위한 동역학적 해석)

  • Yun, Seong-Ho;Park, Jong-Cheon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.10 no.4
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    • pp.16-21
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    • 2011
  • This paper described an analysis of dynamic mechanism for the industrial two-step folding automatic door using commercial software packages. Two modeling types of operating on the guide rail, the sliding one and the rolling, were adopted to investigate effects of impact force when the door ascends the guide rail. The magnitude of impact force was found very peaklike large over an initial duration of the door's moving up. The amount of damping coefficient for alleviating this shock was controlled to such a moderate degree that the operating conditions can be obtained for the purpose of design. Moreover the behavior of both dynamic stress and deformation were observed for acquirement of structural reliabilities of the combined guide rail and rolling mechanism. This research will be a very useful tool in the near future for the dynamic analysis of the multi-step folding automatic door.

Parametric Study of Curved Guideways for Urban Maglev Vehicle (도시형 자기부상열차의 곡선 가이드웨이 매개변수 연구)

  • Han, Jong-Boo;Kim, Ki-Jung;Han, Hyung-Suk;Kim, Sung-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.38 no.3
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    • pp.329-335
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    • 2014
  • A maglev vehicle of middle-low speed subjected to both a lift force and a guidance force by a U-shaped single electromagnet is operated over a curved guideway without a guidance controller. Therefore, it is required to carefully decide the curve shape for preventing contact between the vehicle and the guiderail for the case that a Maglev vehicle is operated over a curved guideway with a small radius. Specifically, the shape of the transition curve is very important from the stability viewpoint. This study analyzes the influence of curve shape on maglev stability through parametric composition of the transition curve during vehicle guidance. To this end, a multibody dynamics-based threedimensional Maglev vehicle model was developed. The model was integrated with the vehicle, curved guideway, electromagnets, and their controllers. Using this model, a realistic parametric study including the curved guideway was carried out. The results of research should be considered usefully in the design of bogies and the curve shape.

A Study on Estimation of Environmental Value of Tentatively Named 'East-West Trail' Using CVM (CVM기법을 이용한 가칭 '동서트레일'의 환경가치 추정)

  • Kee-Rae Kang;Yoon-Ho Choi;Bo-Kwang Chung;Dong-Pil Kim;Hyun-Kyeong Oh;Woo-Sung Lee;Su-Bok Chae
    • Korean Journal of Environment and Ecology
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    • v.36 no.6
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    • pp.676-683
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    • 2022
  • Due to the effects of rapid changes in the living environment since 2000 and the recent unforeseen pandemic, people are refraining from domestic and international traveling and movement, and outdoor activities for health and the public value of forest trails, called Dullegil Trail in Korea, have become more important. This study estimated the environmental value of the tentatively named "East-West Trail," which connects the forest trails crossing Chungcheong and Gyeongsang Provinces using CVM (Contingent Valuation Method). It surveyed visitors to the East-West Trail, and 725 questionnaires were used for analysis. The average characteristics of respondents were those who exercised 2-3 times per week, visited a forest trail not far from their residence with friends or family, and showed a tendency to spend 50 thousand Korean won or more per visit. Visitors to the Dullegil Trail felt that there was a shortage of information boards on the forest trail, and they preferred a shelter in appropriate locations. We used a double-bounded dichotomous choice (BDDC) logit model proposed by Hanemann to measure the conservation value of the East-West Trail. It was estimated that the environmental value that a visitor to the East-West Trail could obtain was 30,087 won per trip. The estimated environmental value of the East-West Trail can be converted to about 94 billion won total visitors annually based on the population belonging to the direct-use zone near the East-West Trail. As there has been no study on the environmental value of forest trails using CVM, the results of this study will be able to suggest the feasibility of the government policies on forest trails.

Bond Graph Modeling and LQG/LTR Controller Design of Magnetically Levitation Systems (자기부상 시스템의 본드선도 모델링 및 LQG/LTR 제어기 설계)

  • 김종식;박전수
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.15 no.5
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    • pp.1620-1634
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    • 1991
  • 본 연구에서는 전기/자기 및 기계적 요소들이 복합되어 이루어진 자기부상 시 스템의 설현을 위한 기초단계로서 제어동역학(controlled dynamics) 측면에 입각한 모 델식을 본드선도 기법을 이용하여 보다 조직적으로 유도한다. 우선, 자속흐름 확장 및 자속 유출량을 고려하여 부상 시스템을 모델링하고 차량/레일 및 2차 현가(second ary suspension)장치를 포함한 자기부상 시스템을 모델링한다. 다음, 지지 및 안내 방향의 동역학을 동시에 고려한 2차원 자기부상 시스템을 본드선도의 다접점 필드(mu- ltiport field) 개념을 이용하여 모델링한다. 끝으로, 본드선도 기법으로 모델링된 2차원 자기부상 시스템의 안정도와 성능을 향상시키기 위하여 LOG/LTR(linear quadra- tic Gaussian control with loop transfer recovery) 제어시스템을 설계한다. LQG/ LTR 제어방법은 Doyle과 Stein에 의해 인성(stability-robustness) 문제와 주파수역 성능을 설계시에 직접 고려할 수 있는 강력한 선형 다변수 제어시스템 설곕방법으로 현재 널리 사용되고 있다.

Effect of Damper Between Maglev Vehicles on Curve Negotiation (자기부상열차 차간 댐퍼의 곡선주행에의 효과 분석)

  • Kim, Ki-Jung;Han, Hyung-Suk;Kim, Chang-Hyun;Yang, Seok-Jo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.4
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    • pp.581-587
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    • 2013
  • In a magnetic train set composed of more than two cars, the installation of dampers between cars is carefully considered for improving both the ride quality and the safety, particularly during curve negotiation. In this study, a dynamic simulation of the ride quality and curve negotiation of a Maglev vehicle was carried out. The dynamic model is developed based on multibody dynamics. The presented full vehicle multibody dynamic model integrates the electromagnet model and its control algorithm. By using this model, the effects of the dampers are numerically analyzed. The proposed damper is installed on the vehicle and tested to analyze its effects. In this study, the simulation and measured results of the vehicle behavior and ride quality are discussed.

Lateral Vibration Reduction of a Maglev Train Using U-shaped Electromagnets (U 자형 전자석을 사용하는 자기부상열차의 횡진동 저감 연구)

  • Han, Jong-Boo;Kim, Ki-Jung;Han, Hyung-Suk;Kim, Sung-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.11
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    • pp.1447-1453
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    • 2012
  • For an electromagnetic suspension (EMS)-type urban Maglev train using U-shaped electromagnets, both the vertical and the lateral air gaps for levitation are maintained only by the electromagnet. The train can run over curved rails without active lateral air gap control because the U-shaped electromagnet simultaneously produces both a levitation force and a guidance force, which is dependent on the levitation force. Owing to the passive control of the lateral air gap, the lateral vibration could exceed the limits of the lateral air gap and acceleration. In this study, dynamic analysis of a Maglev train is carried out, and the effectiveness of a lateral damper for vibration reduction is investigated. To more accurately predict the lateral vibration, a Maglev vehicle multibody model including air-sparing, guideway irregularities, electromagnets, and their controls is developed.

A Study on the Fire Drill Behavior Characteristics in Rehabilitation Center for Visually Impaired Persons (시각장애인 복지관의 화재 피난행태 특성분석 연구)

  • Lee, Jeong-Soo;Kwon, Heung-Soon;Kim, Eung Sik
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.8
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    • pp.5646-5653
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    • 2015
  • This study focused on the architectural, interior and management guidelines in rehabilitation center for visually impaired persons. For these purposes, we reviewed the movement behaviors and the characteristics of fire drill in rehabilitation center for visually impaired persons. The results are as follows. : First, the liner circulation paths and interior landmarks are recommended, and dwelling units and program rooms should be located in ground floor for barrier free evacuation. Second, It is important to establish continuous handrail, variations of paving patterns and materials, good color definition, tactile informations and directional sound. Third, it is necessary to serve more specified architectural, interior, and management guidelines according to impaired prototypes.