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정락교(Raggyo Jeong),김연수(Yeonsu Kim),박성혁(Sunghyuk Park),목진용(Jinyong Mok),이정식(Jungsik Lee) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
In the design of the light rail transit which is more reliable and economical, it is essential to develope a efficient third rail system. Especially, the analysis for the conductivity of conduct rail and the wear of collecting shoe is the first step of its development. In this paper, experiments for conductivity in conductor rail, wear in collecting shoe were performed respectively as different materials of conductor rail and current collector. Noise level and interruption, wear and contact resistance of collecting shoe were proposed as design parameters for the development of this system. Experimental equipment and methods of design parameter stated above were proposed, which is expected that analyzed results will be used as a basic data for the development of the system.
레일전류 측정을 통한 신호시스템과 차량간의 간섭전류 해석
장동욱(Donguk Jang),정락교(Raggyo Jeong) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4
Compatibility concerns between train signalling systems and rolling stock are a significant problems to cross-acceptance of rolling stock in urban railway system. In this paper, we measured the conducted emission flowing current through rails and analyzed results for DC rolling stock.
한국형 수요응답형 순환교통시스템(PRT) 개발을 위한 시작차량 설계
강석원(Seokwon Kang),조정길(Jeonggil Cho),정락교(Raggyo Jeong),김준우(Joonwoo Kim),구정서(Jeongseo Koo) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The Personal Rapid Transit(PRT) system is highly interested in future transportation developments due to its possibilities as sustainable and green transport solutions to meet a need for demand-responsive transport services. In particular, Korean PRT vehicle has been developed including its technical features (e.g., all-wheel drive capability, wireless power supply, and magnetic marker-based guidance control) for flexible applicability on the basis of fundamental requirements and mechanism of conventional PRT system. For this purpose, the specifications and system configuration of PRT vehicle suitable as a new transportation system in Korea were presented in this study. In addition, static structural and fatigue analyses of the structure design were achieved by means of finite element(FE) simulation technique, and their structural stability was evaluated according to design criteria specified in the ASCE-APM standards.
[기술논문] 소형궤도차량(PRT) 차체의 설계사양 도출 및 구조강도 평가 연구
조정길(Jeonggil Cho),구정서(Jeongseo Koo),강석원(Seokwon Kang),정락교(Raggyo Jeong) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.4
PRT(Personal Rapid Transit) system is a new transportation system which will meet increasing demands of traffic in Korea. It is also an environment-friendly transportation and automatically operated. For these reasons, researches on the PRT system are actively undergoing, but the PRT vehicles have different forms of subway, bus, etc. There are no design standards to evaluate structural integrity, yet. In this paper, Structural design specifications are derived, which are based on the performance test standard for EMU and the ASCE-APM standards. We also perform the static and fatigue analyses by FE simulation and suggest strategies to improve an initial structure design. In addition, we derived the design specifications for energy-absorbing structures to meet the conditions of the collision scenarios predefined from a view point of operation safety.
PRT차량의 Rolling 감소를 위한 Anti-roll bar의 적용 연구
김현태(Hyuntae Kim),구정서(Jeongseo Koo),김준우(Junwoo Kim),조정길(Jeonggil Cho),정락교(Raggyo Jeong),강석원(Seokwon Kang) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
본 논문에서는 PRT 차량의 Rolling 감소를 위해 Anti-roll bar 를 적용하여 동특성 분석을 진행 하였다. 다물체 동역학 프로그램인 Adams/car 를 이용하여 Anti-roll bar 를 모델링하여 ISO 3888 (Double Lane Change test)를 진행하였다. 그 결과, 앞뒤 현가장치 모두 Anti-roll bar 를 장착한 경우 가장 큰 감소율을 보였다. Anti-roll bar 를 장착하지 않은 경우 대비 Roll displacement 의 경우 30.4% 감소 Roll rate 의 경우 29.5% 감소를 보였다. 차량의 주행안정성에 영향을 미치는 Side slip angle 의 경우도 12.5% 감소 하였다. 그러나 Antiroll bar 를 장착한 경우에 횡가속도 와 Yaw 가 증가 하였으나 그 차이는 거의 없다. In this paper, we performed the dynamic analyses of a PRT vehicle model with anti-roll bars to decrease rolling motions. The PRT vehicle with anti-roll bars was simulated according to the ISO 3888, Double Lane Change test, by using the multi-body dynamics software. As the result, the roll angle of the PRT vehicle with anti-roll bars on the front and rear suspension was the smallest when compared with the cases with one anti-roll bar or without any anti-roll bar. A roll displacement and rolling rate could be reduced by 30.4% and 29.5% respectively. The side slip angle, which affects vehicle running stability, was reduced by 12.5%. Although the lateral acceleration and the yawing angle were increased, the increases of these values were small and negligible.
김현태(Hyun Tae Kim),김준우(Jun Woo Kim),조정길(Jeong Gil Cho),구정서(Jeong Seo Koo),강석원(Seokwon Kang),정락교(Raggyo Jeong) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.3
본 연구에서는 한국형 PRT차량의 주행안정성 및 승차감 향상을 위해 현가장치 최적화를 진행하였다. ISO 3888(Double Lane Change Test)를 통하여 주행안정성을 분석하고 ISO 2631-1을 이용하여 승차감 분석을 진행하였다. 이를 통해 주행안정성과 승차감에 대하여 다중반응표면법을 적용하여 현가장치 최적화를 진행하였다. 그 결과 모든 반응함수가 초기설계치보다 모두 개선되는 만족함수의 비율은 3.9 : 6.1이며, 이때 현가장치의 특성은 Stiffness의 경우 S2와 S3 model의 사이 값인 30.68 N/mm과 Damping계수의 경우 D1 model의 값을 갖는다. 초기설계인 현재 PRT차량의 현가장치와 비교했을 때, 최적화된 PRT 현가장치 설계는 Roll angle와 Yaw rate는 0.37%, Side slip angle은 2.8%, Ride comfort는 5% 향상된다. In this study, running stability and ride quality analyses, applying the ‘ISO 3888 (double lane change)’ and ‘ISO 2631-1’ (mechanical vibration and shock) tests, were performed for the suspension optimization of the Korean personal rapid transit (PRT) vehicle. The suspension optimization results for running stability and ride quality were derived by applying the multiresponse surface method. From the comparisons of the optimization results for different ratios of the objective functions of running stability and ride quality, we derived the best objective function ratio of 3.9-to-6.1 to improve both the running stability and the ride quality. With the optimized results, the suspension stiffness became 30.68 N/mm, between the value of the S2 and S3 models, and the damping coefficient equaled that of the D1 model. When compared with the suspension of the current PRT vehicle, the roll angle, yaw rate, sideslip angle, and ride comfort were improved by 0.37, 0.37, 2.8, and 5, respectively.
[기술논문] 한국형 소형궤도차량(PRT)의 내구성 및 주행안정성 평가 연구
조정길(Jeonggil Cho),김준우(Junwoo Kim),김현태(Hyuntae Kim),구정서(Jeongseo Koo),강석원(Seokwon Kang),정락교(Raggyo Jeong) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.5
The PRT(Personal Rapid Transit) system is highly interested to meet a need for demand-responsive transport service and increasing demands of traffic in Korea recently. And it is being spotlighted as an eco-friendly transportation system. For these reasons, researches on the PRT system are actively undergoing in Korea. In this study, we evaluated the static structural and fatigue strengths based on ASCE-APM standards and ERRI B 12/RP 17 by means of FE simulation. We also evaluate the running stability by multi-body dynamic analyses and the rollover safety by a theoretical static stability factor according to the road modeling scenarios for the PRT system. From the results of this study, we confirmed the durability and running stability of the Korean PRT under development.