• Title/Summary/Keyword: Roller Rail

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A Study on the Characteristics of the Wheel/Roller Contact Geometry (차륜/궤조륜 기하학적 접촉특성에 관한 연구)

  • Hur, Hyun-Moo
    • Journal of the Korean Society for Railway
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    • v.9 no.5 s.36
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    • pp.618-623
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    • 2006
  • Understanding the contact between wheel and rail is a starting point in railway vehicle dynamic research area and especially analysis for the contact geometry between wheel and rail is important. On the one hand, the critical speed as the natural characteristics of rolling-stock is generally tested on the roller rig. The geometrical characteristics of the wheel/roller contact on the roller rig are different from these of the general wheel/rail contact because the longitudinal radius of roller is not infinite compared with rail. Thus, in this paper we developed the algorithm to analyze the wheel/roller contact geometry of our roller rig which is constructed now and analyzed the difference between whee/roller contact and wheel/rail contact. In conclusion, we found that the yaw motion of wheelset and the roller radius influence the geometrical contact parameters in wheel flange contact area.

Design of a Roller Rail for the Drawer of Three-Door Refrigerators Using Taguchi Method (다구찌 기법을 이용한 3 문형 냉장고 서랍용 롤러 레일의 설계)

  • Lee, Boo-Youn;Kim, Je-Hyun
    • Journal of the Korean Society for Precision Engineering
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    • v.26 no.6
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    • pp.97-105
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    • 2009
  • Optimal design of a roller rail which replaces the ball rail for three-door refrigerators is presented using the finite element analysis and the Taguchi method. Stress and deformation of the roller rail for an initial design are analyzed and evaluated. Optimal design parameters are determined using the Taguchi method. The maximum stress of the optimal design is favorably reduced comparing to the initial design. It is verified through an additional analysis that the drawer on the roller rail will not be derailed even if one opens the drawer with a transverse force.

Variation of Rail's Axial Compressive Force on Railway Bridges Due to Thermal and Seismic Loads with using EQS Bearings (EQS 면진받침 사용 시 온도하중 및 지진하중에 대한 철도교량 레일 압축력 변화)

  • Kim Lee Hyeon;Kim Haksoo;Choi Eunsoo
    • Journal of the Korean Society for Railway
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    • v.8 no.3
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    • pp.276-285
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    • 2005
  • This study discussed the effect on rail's axial force due to thermal and seismic loads according to supporting conditions of railway bridges; the considered supporting conditions are 1)simply supported, 2)roller at both ends, and 3)roller with horizontal spring at both ends. Closed form solutions are used to calculate the axial farces on rails. The roller at both ends of a bridge span decreases the compressive axial force on rail due to thermal load compared with the simply supported condition. However, the lateral springs at roller are not helpful to decrease the rail's compressive axial force.

A Study on the Wheelset Behavior on the Roller Rig for Railway Bogie Testing (대차 주행시험대상에서의 윤축 거동에 대한 연구)

  • Hur, Hyun-Moo;Park, Joon-Hyuk;You, Won-Hee;Park, Tae-Won
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.1207-1212
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    • 2007
  • The critical speed of railway bogie related to the stability of the railway rolling-stock is important. Testing of the dynamic performance of bogie is conducted using a roller rig in a laboratory in place of field testing on track. This roller rig is composed of two rollers equivalent to track and used to test the dynamic characteristics of vehicle. But, the geometrical characteristics of the wheel/roller contact on the roller rig are different from those of the wheel/rail contact because the longitudinal radius of roller is not infinite compared with rail. This difference has influence on the wheelset behavior and the critical speed of bogie. Therefore in this paper, we have studied the behavior of wheelset and bogie on the roller rig for railway bogie testing with the purpose of developing the scaled roller rig. As an analysis results, it has been shown that the critical speed of bogie on the roller rig is slightly lower than that of bogie on track.

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The Design of Supporter to Prevent Overclamping in Wedge Type Rail clamp (쐐기형 레일클램프의 과클램핑 방지를 위한 지지장치 설계)

  • 한근조;안찬우;전영환;심재준;한동섭;김병진
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1446-1449
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    • 2003
  • In this study we analyze operation principle of wedge type rail clamp using in the harbor and when wind force applies to container crane, we calculate deformation in each part of rail clamp. As a result of calculation, we will design rail clamp supporter that forbid overload to be applied at rail clamp according to adjust climbing wedge distance of roller. It would be adapted various container capacity and wind velocity.

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Experimental Study on Process Design of Rubber Pad Bending (고무 패드 벤딩 공정설계에 관한 실험적 연구)

  • Kwon, Hyuck-Cheol;Im, Yong-Taek;Ji, Dong-Cheol;Rhee, Meung-Ho
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.407-412
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    • 2000
  • In this study, a research for process design in bending of structural frame of AA6061-T6 with rubber pad was conducted. In this process, the conventional lower die made of metal is replaced with a polyurethane pad, resulting in high flexibility during bending. Vulcanized polyurethane rubber with shore A hardness of 60 was used for the pad. Experiments on a newly developed bending machine were carried out by controlling the stroke of the roller and horizontal movement of roller pad lower die. From this, the relation between roller path and geometry of the materials bent was obtained for the process design of producing roof rail part of a passenger car and the experimental result was compared with the target profile. For more accurate process design, it is required to control the roller path interactively. Based on the experience in developing the prototype bending machine, it is construed that a fully automated bending system with rubber pad to produce various light-weight components for automotive body frames can be successfully developed.

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Position Controller of Rail Guided Unmanned Monitoring System with the Driving Slip Compensator (주행 슬립 오차 보상기를 가지는 레일 가이드 무인 설비 감시 장치의 위치 제어기)

  • Bae, Jongnam;Kwak, Yunchang;Lee, Dong-Hee
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.5
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    • pp.792-799
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    • 2017
  • The real time unmanned monitoring system of an equipment's internal parts and condition requires the monitoring device to be able to stop at a set location on the rail. However, due to the slip between the driving surface and the roller, an error occurs between the actual position and the command position. In this paper, a method to compensate the position error due to the roller slip is proposed. A proximity sensor located at both ends of the rail detects the starting point and the maximum position pulse, linearly compensating the error between the angular position of the motor and the mechanically fixed starting and maximum position pulse of the rail in forward and reverse direction. Moreover, unlike the existing servo position controller, the motor adopts the position detection method of Hall sensor in BLDC (Brushless DC) and applies an algorithm for low-speed driving so that a stable position control is possible. The proposed rail guided unmanned monitoring system with driving slip compensator was tested to verify the effectiveness.

Load analysis of Wedge type Rail Clamp (쐐기형 Rail Clamp의 하중분석)

  • Han, Geun-Jo;Ahn, Chan-Woo;Kim, Tae-Hyong;Shim, Jae-Joon;Han, Dong-Seop;Lee, Ho
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.1-6
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    • 2003
  • In this paper, we design a wedge type rail clamp which can protect container crane from wind with constant clamping force regardless of the operating period. When we design wedge type rail clamp. it is important to determine the angle of wedge and analyze a contact condition of roller and wedge so that we might develop a rail clamp with variable capacity. Therefore, this paper suggest a process to decide wedge angles within feasible range which could be obtained using load analysis and FEA of wedge type rail clamp.

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