• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.263-265
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• 2006

The pure electric braking system need to be developed to stop the electric train to zero speed by electricity. This system has advantages like reduction of weight, maintenance cost, noise, and dust generated by disk friction. Therefore, we will study this system for Korean urban transit system.

• Smart Structures and Systems
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• v.21 no.5
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• pp.653-668
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• 2018

This work proposes and investigates re-centering negative stiffness dampers (NSDs) for vibration suppression in high-speed trains. The merit of the negative stiffness feature is demonstrated by active controllers on a high-speed train. This merit inspires the replacement of active controllers with re-centering NSDs, which are more reliable and robust than active controllers. The proposed damper design consists of a passive magnetic negative stiffness spring and a semi-active positioning shaft for re-centering function. The former produces negative stiffness control forces, and the latter prevents the amplification of quasi-static spring deflection. Numerical investigations verify that the proposed re-centering NSD can improve ride comfort significantly without amplifying spring deflection.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.21 no.5
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• pp.78-89
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• 2022

Super - Bus Rapid Transit (S-BRT), adding the advantages of urban railroads to BRT, has emerged to solve the problem of low speed and reliability of the existing BRT. Notably, the S-BRT driveway is classified into exclusive lanes and roads, as BRT, in the domestic guidelines. However, S-BRT and BRT have different operating goals and characteristics, so it is necessary to systematize the S-BRT driveway. Therefore, this study classified an S-BRT driveway into exclusive lane, shared lane with overtaking lane, and shared lane without overtaking lane based on domestic conditions. Subsequently, a control strategy for transit signal priority in each driveway was presented by the study based on the characteristics of the driveway to achieve the S-BRT target service level. Finally, the S-BRT target service level was almost achieved, and the travel speed was high and increased in the order respectively in the exclusive lane, shared lane with overtaking lane, and shared lane without overtaking lane in the study. Hence, it is important to operate a transit signal priority considering the characteristics of each driveway when operating the S-BRT. In essence, this study is expected to be used as a reference for driveway design and transit signal priority operation when introducing S-BRT in each local government in the future.

• Journal of the Korean Society for Railway
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• v.9 no.4 s.35
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• pp.449-454
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• 2006

본 연구는 Labview Simulation Interface Toolkit과 Matlab/Simulink를 조합한 제어 시스템을 매우 짧은 차간 간격을 요구하고, 차량 간의 충돌을 피하기 위해서 매우 정확한 속도제어를 필요로 하는 개인 고속 이동 시스템에 응용하는 것에 대해서 다룬다. 간단한 차량의 운동방정식을 유도하기 위해서 선형모터를 도입한다. 후미 차량에 의해서 추종되어 져야하는 속도 프로파일은 두 차량(선행차량과 후미차량) 간의 상태정보를 기초로 해서 생성된다. 속도 프로파일 추종을 위한 제어 시스템은 Matlab/Simulink 에 의해서 설계된다. 모의시험 결과는 제안된 제어 시스템이 속도 추종 특성을 평가하는데 효과적임을 보인다.

• Proceedings of the KSR Conference
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• 2002.10b
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• pp.820-825
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• 2002

As the speed of rail transit is higher, it is very important to secure the safety and confidence of the braking device and in the point of view, by means of the rise of the temperature from the friction between the disk and pad which are the actual part of a braking system, the damage of brake disk is the main cause to lose the safety of braking device. Therefore, in this study, to predict the danger of a disk brake and to know its max. temperature in the train service the module of a temperature measurement by the non-contact method was developed.

• Journal of the Korean Society for Railway
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• v.4 no.1
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• pp.1-8
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• 2001

In this paper, the dynamics and stability of the automated guideway transit (AGT) vehicles with rubber tires are investigated. Two types of AGT systems are considered: the bogie-type and steering-type systems. The critical speeds for the dynamic instability of lateral and yawing motions are investigated by use of the Routh-Hurwitz's stability criterion. It is shown that the bogie-type AGT vehicles are likely to be stable within the range of practical operating speed, whereas it is not true for the steering-type AGT vehicles. It is also shown that the control performance of steering-type AGT vehicles can be improved by choosing proper steering gains of the closed-loop steering control system.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.1423-1429
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• 2006

본 논문에서는 개인고속이동(PRT: Personal Rapid Transit)시스템에서 차량의 속도를 제어하기 위해서 필요한 속도 프로파일의 생성과, 생성된 속도 프로파일의 추종 특성을 관찰하기 위한 제어 시스템의 구축에 관해서 다룬다. 제어 시스템을 구축하기 위해서 Labview Real Time Module과 Matlab/Simulink 를 채용한다. 제어기준신호인 속도 프로파일은 간단한 선형방정식을 이용해서 생성할 수 있으며 방정식에 포함되어 있는 변수들에 대한 정보를 얻기 위해서 가상의 선행차량으로부터 feedback되는 차량의 상태정보를 이용한다. 간단한 모의시험을 통해서 속도 프로파일 추종특성의 평가를 위한 제안된 제어시스템의 효용성을 보인다.

• Proceedings of the KSR Conference
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• 1998.11a
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• pp.288-295
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• 1998

In this paper the system safety program plan(SSPP) for the development of Korea high speed railway system was presented. The plan for the design phase built up base upon MIL-STD 882C, manual for the development of rail transit system safety program plans by American Public Transit Association, and SSPP for Seoul-Pusan High Speed Rail project should be modified and then applied to the phases of manufacturing, test and commissioning. The plan deals with the safety program, the reference standards, the management and responsibility for the safety related activities, the methods to be used for early identifying safety critical items and functions and eliminating or controlling all hazards in a timely and cost-effective manner, and the documentation generated for safety assessment.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.04a
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• pp.947-950
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• 2008

PRT(Personal Rapid Transit) systems requires very short headways to increase the line capacity and a very reliable vehicle control algorithm for avoidance of the impact between vehicles. In this paper a brake curves (or speed patterns) for PRT system that make it possible the effective vehicle control and a collision avoidance algorithm are introduced. For the simulations and the evaluations of the proposed algorithm a combined simulation platform that consists of Labview Simulation Interface Toolkit and Matlab/Simulink and a specific hardware configuration are employed.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.802-809
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• 2010

KIMM(Korea Institute of Machinery and Materials ) and ROTEM have been leading development of the low to medium speed urban transit maglev for the past 20 years. The result of this long term national project is UTM-01 ( Urban Transit Maglev -01 ) in 1998 and UTM-02 in 2006 and the 6.1 km long double track maglev commercialization project in Inchon international airport from 2006 to 2012. In this paper the status of the maglev development for the past 20 years is reported. Design changes in key technologies - maglev bogies, secondary suspension system, levitation system, propulsion system, major power suppling equipments from UTM-01 system to that of commercialization project - are described.