• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.95-95
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• 2004

철도차량용 주행장치인 대차는 차체의 하중을 지지하고, 승객 및 차량의 안전, 주행성능 및 승차감에 지대한 영향을 미치는 핵심 구조부품이다. 주행장치는 크게 대차틀, 차륜 및 차축, 1차 2차 현가장치, 제동장치, 전동기 및 동력전달장치 등으로 구성되며, 대차틀은 형상이 복잡하고 하중을 직접 지지할 뿐만 아니라 하중조건도 정적 및 동적하중이 복합적으로 작용하고 있다. 대차틀은 차체 자중 및 승객 하중에 의한 정하중과 곡선주행, 제동시 발생하는 하중 및 불규칙한 선로와 차체, 주행장치, 윤축의 운동모드에 의한 동하중을 받고 있다.(중략)

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1757_1758
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• 2009

본 논문에서는 철도차량의 능동조향시스템 연구를 위한 축소 조향대차의 장애물 검지시스템 구축에 대여 연구하였다. 철도차량에서 능동조향이란 곡선부 주행 시 차륜/레일 접촉에 의한 승차감 저하 및 차륜/레일의 마모와 소음을 줄이고, 고속주행을 위한 조향성능 및 주행안정성을 확보하기 위한 휠셋의 제어기술이다. 따라서 논문에서는 조향제어전략 및 제어기법을 연구하기 위한 축소 차량모델(견인대차와 조향대차로 구성)의 개발과정으로서 자동운전을 위한 장애물 검지시스템에 대한 연구를 수행하였으며 주행실험을 통해 그 성능을 검증하였다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.05a
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• pp.114-114
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• 2004

주)태양금속에서 고속화차 용접구조형 대차를 채택하여 화차론 제작하였는데 한국철도기술연구원에서는 대차의 구조강도론 검증하기 위해 구조해석을 시행한 후 스트레인게이지를 실재 대차에 장착하여 정하중 시험을 시행하였고 또한 진동가속도계를 차체 및 대차프레임에 장착하여 주행안전성과 관련된 진동성능시험을 시행하였다. 본 논문은 새로 개발된 용접구조형 대차 및 이를 장착한 화차에 대해 대차프레임의 강도 검증과 화차의 안정성 여부를 판단하기 위한 시험을 시행한 결과에 대한 내용이다.(중략)

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2017.11a
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• pp.72-73
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• 2017

인터모달 자동화물운송시스템 기술개발에 있어서 대차의 안정적인 운행이 가능하도록 전자적 신호를 통하여 차량의 구동을 제어하고 원격제어가 가능하도록 통신설비를 구축을 위한 대차주행제어시스템 기술에 대한 전반적인 기술검토를 추진하였다.

• Journal of the Korean Society for Railway
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• v.10 no.5
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• pp.613-618
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• 2007

The performance of the railway bogie is classified into the stability and the steering performance. Testing for the bogie stability is conducted on the roller rig, but testing for the bogie steering performance on test facility is very difficult, so the testing for the vehicle curving performance is conducted on the real curve track. Testing the railway bogie on the full scale test rig is desirable, but it caused many problems relating to test costs and test time. As a possible alternative to overcome these problems, a small scaled test rig is actively used in the field of bogie stability. Thus, in this paper, we have studied a scaled track to test the bogie steering performance. For this purpose, we designed the 1/5 scaled test track equivalent to radius 200 curve and confirmed the validity of the testing for the bogie steering performance on the sealed curve track through the testing using 1/5 scaled bogie.

• Journal of the Korean Society for Railway
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• v.10 no.6
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• pp.800-805
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• 2007

The critical speed of railway bogie is very important in terms of the verification of the vehicle design procedure and safety. The dynamic performance of bogie is tested on the railway roller rig in a laboratory in place of field testing on track. But, the testing on the full scale roller rig caused many problems relating to test costs, test time and has the difficulty in test condition setup. To overcome these problems, scaled models were used in the filed of railway vehicle design and test. In this paper, we have studied the critical speed of scaled bogie model. We have made the 1/5 scaled bogie, the scaled roller rig and analyzed the critical speed of the scaled bogie through the numerical simulation and running test of the scaled bogie. We have confirmed that the analysis results of the critical speed correspond with the test results.

• Journal of the Korean Society for Railway
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• v.15 no.1
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• pp.9-16
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• 2012

The dynamic stability of railway vehicle has been one of the important issues in railway safety. The dynamic simulator has been used in the study about the dynamic stability of railway vehicle and wheel/rail interface optimization. Especially, a small scale simulator has been widely used in the fundamental study in the laboratory instead of full scale roller rig which is not cost effective and inconvenient to achieve diverse design parameters. But the technique for the design of the small scale simulator about the dynamic characteristics of the wheel-rail system and the bogie system has not been well developed in Korea. Therefore, the research using the small-scaled derailment simulator and the 1/5 scaled bogie has been conducted. In this paper, we did running stability test of 1/5 scaled bogie using small-scaled derailment simulator. Also, for the operation of the small scaled simulator, it is required to investigate the performance and characteristics of the simulator system. This could be achieved by a comparative study between an analysis and an experiment. This paper presented the analytical model which could be used for verifying the test results and understanding of the physical behavior of the dynamic system comprising the small- scaled derailment simulator and the 1/5 scaled bogie.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.1249-1254
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• 2010

The bogie structure of center guided type monorail has been applied to Incheon Wolmi Eunha monorail at first in the world, and aluminum alloy material bogie is first ever introduced in Korea. Since bogie transfers vertical and horizontal loads to the track and guide rail as an essential system, its structure should have enough durability and secure excellent operation performance and ride quality. This study presents a suitable structure for center guided type monorail, a system combination method for bogie operation performance and riding quality, and a solution for better bogie frame durability.

• Journal of the Korean Society for Railway
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• v.13 no.1
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• pp.1-8
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• 2010

In domestic developing magnetically levitated (Maglev) vehicle, bogie frames install electromagnets which provide the vehicles to run with levitation and guidance forces; moreover, the linear motors used for traction are integrated into the same mechanical structure. This paper presents the process which predicts the evaluation of life cycle for bogie frame on various running conditions. Durability analysis considering vibration effect is simulated by using random loads resulted from dynamic simulation which takes into account the irregularities of guide rail. And it supports additional weak points which were not examined in static analysis.

• Journal of the Korean Society for Railway
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• v.18 no.4
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• pp.309-316
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• 2015

The contribution of exterior devices such as bogie fairings and pantographs to running resistance was estimated on the basis of coasting tests at up to 350 km/h with the help of the Korean Next Generation High speed train (HEMU-430X). In order to assess the reduction of air resistance by nose car's bogie fairing, coasting tests were conducted with a removable bogie fairing at various speed ranges. And, the contribution of the pantograph to air resistance was also estimated with coasting tests that include the pantograph's rising and descent modes. The linear regression method was used to examine decelerations from time-velocity data and the equation of resistance to motion is proposed from the deceleration data. From the aerodynamic term of the equation of resistance to motion, the contribution to air resistance by nose car's bogie fairing and pantograph was estimated. The results show that the air resistance was reduced by about 3.8% by the nose car's bogie fairing. And, the 3.9% increase of air resistance by the pantograph (open knee mode) has been found.