• Title, Summary, Keyword: 체결장치

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우주발사체에 적용되는 지상 엄브리칼 체결장치의 구성과 기능

  • Kim, Yong-Uk;Kim, Dae-Rae;Lee, Jeong-Ho;O, Seung-Hyeop
    • The Bulletin of The Korean Astronomical Society
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    • v.37 no.2
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    • pp.151.1-151.1
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    • 2012
  • 우주발사체와 발사지원설비를 연결하여 추진제 공급과 전기신호 송수신 등을 가능하게 하는 메커니즘을 엄브리칼 장치라고 한다. 국내 우주발사체의 경우 액체산소와 케로신을 추진제로 사용하며, 질소, 공기 및 헬륨 등의 가스를 밸브구동, 공간 퍼지, 추진제 가압에 이용한다. 본 논문에서는 우주센터의 발사대설비에 적용된 엄브리칼 장치 중 추진제 및 고압가스 공급을 위한 자동체결장치(auto coupling device)의 구성, 기능 및 발사 준비를 위한 프로세스에 대해 기술하고 있다. 자동체결장치는 발사체 하부 두 곳에 연결되며, 산화제 공급측의 체결장치(coupling device 1)와 연료 공급측의 체결장치(CD 2)로 구성된다. 이 장치는 발사체와의 접촉면에서 기밀을 확보한 상태에서 내부의 탱크, 밸브, 인터스테이지 등에 추진제 및 각종 가스를 공급하는 통로역할을 하며, 발사준비가 완료된 후에는 발사체 이륙 전 또는 이륙과 동시에 발사체로부터 자동으로 분리된다. 각각의 체결장치 구성품으로는 발사체 이륙시 발생하는 고온의 화염으로부터 장치를 보호하는 PD(protective device), 접촉면에 기밀을 제공하고 추진제 누출을 방지는 MCP(multi-channel plate), 접촉면을 보호하기 위한 덮게, 각종 연결 배관의 전진과 후진을 위한 캐리지, 발사체와의 체결을 지지하는 그립 등이 있다. 발사 준비를 위해서 사전에 장치의 독립운용시험을 통해 각 구성품의 상태와 기능을 점검하고 장치의 작동성을 검증한다. 이후 발사체를 모사하는 기체 및 관제설비와 종합적으로 연계 시험과 모사시험을 수행하여 최종적으로 발사준비상태를 확인하게 된다. 이러한 자동체결장치의 운용 경험은 한국형발사체의 지상지원설비 개발에 활용할 수 있을 것이다.

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Evaluation of Uplift Forces Acting on Fastening Systems at the Bridge Deck End Considering Nonlinear Behaviors of the Fastening Systems (체결장치 비선형 거동을 고려한 교량 단부에서의 체결장치 압상력 평가)

  • Yang, Sin Chu;Kim, Hak Hyung;Kong, Jung Sik
    • Journal of the Korean Society for Railway
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    • v.20 no.4
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    • pp.521-528
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    • 2017
  • In this study, vertical loading tests were conducted to investigate the nonlinear behaviors of the fastening systems that have generally been used in the concrete track of domestic railway lines. Nonlinear load-displacement curve models were derived based on the test results. The uplift forces generated in the fastening systems were evaluated by applying the derived nonlinear models as well as the existing linear models. The influence of the factors on the maximum uplift force of the fastening system was analyzed through a parameter study on the distance between neighboring sleepers, the horizontal distance between the center of the bearing and the nearest fastening system from the deck end, and the height of the bridge girder. From the evaluation results it is known that, for economical track and bridge design, due to deck end deformation, it is necessary to consider the nonlinear behavior of the fastening system in the calculation of the uplift force of the fastening systems.

A Development of New Rail Fastening System (새로운 레일체결장치 개발에 관한 연구)

  • Kwon, Tae-Soo;Kim, Eun;Yim, Young-Iark
    • Proceedings of the KSR Conference
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    • pp.319-327
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    • 2000
  • 본 연구는 국내 독자기술의 절대적 빈곤속에서 외국기술에만 의지하는 레일체결장치의 국내 현실을 탈피하기 위하여 독자적인 한국형 레일체결장치 개발을 시도하는 것이다. 본 연구에서는 판 스프링은 제외하고 봉 스프링(coil spring)에 대해서만 우선적으로 시제품을 개발하였다. 세계적으로 유명한 체결장치의 장ㆍ단점을 분석하여 장점만을 취하고자 하는 설계 목적을 가지고 새로운 레일체결장치의 개발에 착수하였다. 본 장치의 개념설계를 통하여 유지보수성과 안전성을 동시에 확보할 수 있도록 하였다. 현재 장치의 모형제작을 통하여 조립성 및 가능성을 타진하였으며 전산응력해석을 통하여 체결 스프링 및 숄더의 적정치수를 산정 하였다. 본 연구는 국내에서 본격적인 체결장치개발의 시초가 되기를 희망한다.

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Rail Corrugation Effects on the Dynamic Behavior of Clips of Rail Fastening System in Operation Environment of Urban Railway (도시철도 운영환경에서 파상마모에 의한 레일체결장치 클립의 진동 특성)

  • Kim, Man-Cheol;You, Won-Hee;Sim, Hyoung-Bo
    • Journal of the Korean Society for Railway
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    • v.19 no.4
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    • pp.489-497
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    • 2016
  • The rail fastening system, which provides a structural connection between the rail and the sleepers, is a main track component that plays an important role in retaining the rail gauge within acceptable tolerances, as well as in passing the train load to the roadbed through the sleepers. In this paper, a modal test was first performed to evaluate the dynamic characteristics (e.g., natural frequency) of the clips of the railway fastening system under the condition of rail corrugation in urban railway operation. The corrugation-induced passing frequency was then compared with the natural frequency of the clips to investigate any resonance effect during train passage. Furthermore, a field test under train passage was conducted to measure the accelerations on the rail and the rail fastening clips as well as the strains on the rail fastening clips in the rail corrugation condition. The field measurements indicated that the accelerations on the rail and the rail fastening clips have a close relationship with the rail corrugation, but they had a minimal effect on the strains of the rail fastening clips.

Evaluation of the Performance Test Load through the Estimation of Vertical Loads on Vibration-Proof Fastening Systems (방진체결장치에 작용하는 수직하중 평가를 통한 성능시험하중 평가)

  • Yang, Sin Chu
    • Journal of the Korean Society for Railway
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    • v.19 no.6
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    • pp.777-784
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    • 2016
  • In this study, regulation of the performance test load of a vibration-proof fastening system used in urban railways was established through evaluation of the loads that it bears in the field. In order to investigate the range of the dynamic stiffness of the vibration-proof fastening system, dynamic stiffness tests were carried out for three types of vibration-proof fastening system that can be domestically supplied. Train and track interaction analyses in the frequency domain were carried out to evaluate the dynamic wheel loads. The track irregularity, which is a very important input factor in train and track interaction analysis, was considered as a PSD (Power Spectral Density) function, which was derived based on the measured data. The loads on the vibration-proof rail fastening system were evaluated considering various operating conditions in the urban railway. Regulation of the performance test load of the vibration-proof rail fastening system was established based on the evaluated loads.

An Experimental Study to Evaluate the Stiffness of Fastening Systems - Translational Stiffness along the Vertical Axis of Rail, Rotational Stiffness along the Strong Axis of Rail - (체결장치의 강성 평가를 위한 실험적 연구 - 레일 연직방향 병진강성, 레일 강축에 대한 회전강성 -)

  • Kim, Jung-Hun;Han, Sang-Yun;Lim, Nam-Hyoung;Kang, Young-Jong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.12 no.4
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    • pp.71-78
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    • 2008
  • In the case of the railway bridges, uplift forces were occurred at the edge of the segments when vehicular loads were applied. These forces caused the compressive and tensile forces in the fastening system. In the past, a structural analysis has been performed to investigate the safety of fastening system which was modeled with one directional spring elements based on the compressive test of fastening system. In this case, the stiffness of the spring element was obtained from experimental study which was conducted by compressive load. Therefore, to perform rational and exact structural analysis, the translational stiffness of the fastening system obtained from the experimental study applied the tensile load and the rotational stiffness should be considered because it was occurred the tensile force as well as the compressive force in fastening system. In this study, an elastic and inelastic experimental study was performed for six specimens. The translational stiffness along the vertical axis of rail and the rotational stiffness along the strong axis of rail were investigated, also structural behavior of the fastening system was analyzed.

Influence of Initial Clamping Force of Tension Clamp on Performance of Elastic Rail Fastening System (텐션클램프의 초기 체결력이 탄성레일체결장치의 성능에 미치는 영향)

  • Lee, Dong Wook;Choi, Jung Youl;Baik, Chan Ho;Park, Yong Gul
    • Journal of The Korean Society of Civil Engineers
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    • v.33 no.3
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    • pp.1243-1251
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    • 2013
  • The purpose of this study is to investigate the influence of initial clamping force of tension clamp on the performance of an elastic rail fastening system used in sharp curve track. In this study, the initial clamping force and the increasing lateral wheel loads were conducted in the analytical and experimental study, i.e., finite element analysis, laboratory and field test. Using the analytical and experimental results, the performance of the tension clamp was investigated. It was found that the stress of tension clamp depends on the initial clamping force. Therefore the initial clamping force appeared to directly affect the compression stress of the tension clamp. It was found that the compression stress of tension clamp was transferred to the tensile stress by applied the lateral wheel load in service sharp curve track. Further, it was concluded that the initial clamping force was applied on the strengthening force for the tension clamp and then the appropriate initial clamping force was important to ensure a stable performance and long term endurance of tension clamp.

Seismic Performance of Composite Beam-to-Column Joints Using Wedges (쐐기의 원리를 이용한 합성 보-기둥 접합부의 내진성능에 관한 연구)

  • Park, Jong-Won
    • Journal of the Earthquake Engineering Society of Korea
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    • v.11 no.6
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    • pp.63-68
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    • 2007
  • The purpose of this study was to develop a new connection method between steel beams and PC columns known as SL connectors. Composite moment frames consisting of PC columns (or composite columns) and steel beams make the best use of advantages of both concrete and steel materials. However, the connection between two members of different materials can be complex and/or increase the fabrication costs significantly. The concept of SL connectors is based on using wedges and the emphasis is on a self-locking (SL) feature. SL connectors are easy to install and provide better seismic performance compared to conventional connections. To evaluate the seismic performance of the steel beam-to-PC column joints with SL connectors, cyclic load tests were conducted. Test result showed that steel beam-to-concrete column joint with SL connectors was able to provide sufficient performance for use in seismic resistant moment frames.

A Study on the Development of New Rail Fastening Devices (철도레일체결장치의 국내 독자모델 개발에 관한 연구)

  • Kwon, Tae-Soo;Cho, Yong-Hyeon
    • Proceedings of the KSME Conference
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    • pp.819-824
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    • 2001
  • Most of rail fastening system used in the interior have depended on the foreign technologies. In this study, new rail fastening device is developed to estabilish the domestic technology. Especially, Pandrol and Vossloh rail fastening devices are analyzed to utilize the weak and strong points. New rail fastening device is designed to combine advantages of two other foreign devices.

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