디젤전기기관차의 공압제동 영향인자 및 특성 분석

최돈범(Don Bum Choi),김민수(Min-Soo Kim) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.11

본 연구에서는 국내 화물 및 여객차량들을 견인하는 디젤전기 기관차의 제동에 따른 동적 거동을 분석하기 위하여 제동장치에 영향을 미치는 마찰계수, 제동압력, 주행저항 등을 시험하였다. 마찰계수는 UIC 541-4를 참고로 Dynamo 시험을 수행하였으며 시험결과는 다변량 회귀분석을 통해 제동하중, 제동초기 속도와의 관계를 분석하여 제시하였다. 제동압력은 상용제동과 비상제동으로 구분하였으며, 제동밸브와 배관의 특성을 반영하기 위하여 시간에 따른 제동압력 변화를 대상 차량에서 측정하였다. 차량에 작용하는 외력을 반영하기 위하여 EN 14067-4의 타행시험을 수행하고 2차 다항식 형태의 주행저항을 제시하였다. 도출한 주행저항을 동일 차종에 대하여 각 국가별로 사용하고 있는 주행저항들과 비교하였다. 차량의 재원, 마찰계수, 제동압력, 주행저항을 바탕으로 직선 평탄 선로를 주행하는 디젤전기기관차의 동적 거동을 EN 14531-1에서 제시된 시간적분을 이용하여 해석하였다. 해석 결과는 상용제동과 비상제동에 대하여 각각 차량의 속도이력 시험결과와 비교 검증하였으며 상당히 합리적인 결과를 도출하였다. 본 연구의 결과들은 철도차량들을 연결하여 운행하는 열차의 동적 거동해석에 활용할 수 있을 뿐 아니라 차량 설계에서 제동에 영향을 미치는 다양한 파라미터들을 분석하고 성능향상의 기초자료로 활용할 수 있을 것으로 기대된다. This paper deals with the braking dynamic behavior of diesel electric locomotive pulling domestic cargo and passenger vehicles. Friction coefficient, pneumatic pressure, and running resistance affecting the braking system were tested. For the friction coefficient, the Dynamo test was performed with reference to UIC 541-4. The results are analyzed by multivariate regression and the relationship between braking force and ititial velocity is presented. The pneumatic pressure were classified into service braking and emergency braking. In order to reflect the characteristics of the brake valve and piping, the pressure rising over time was measured in the vehicle. In order to reflect the external force acting on the vehicle, we carried out the test of EN 14067-4 and presented the second order polynomial formula on a running resistance. The running resistance test results were compared with other countries. The dynamic behavior of a diesel electric locomotive running on a straight flat track based on vehicle resources, friction coefficient, braking pressure, and running resistance is simulated using the time integration presented in EN 14531-1. The simulation results were compared and verified with the vehicle braking test results. The results of this study can be used to analyze the dynamic braking behavior of a train. Also, it is expected that various parameters affecting braking in vehicle design can be analyzed and used as basic data for braking performance improvement.

철도차량의 주행저항 특성 분석

최돈범 ( Don Bum Choi ),류준형 ( Joon Hyeung Ryu ),백광선 ( Kwang Sun Bak ),김영국 ( Young Kook Kim ),채장범 ( Jang Beum Chae ) 대한설비관리학회 2014 대한설비관리학회지 Vol.19 No.3

Running resistance is essential to design a traction and braking forces of a train. the basic elements on the running resistance and measurement methods are reviewed. From measuring data with coasting energy method, the effects of the environmental condition (eg. wind) and measuring error are analyzed. In a tunnel, running resistance is higher than that of open field about 10 % and, it has almost half scatter width mainly due to external wind.

기관사 신체특성을 고려한 철도차량 운전실 설계

최돈범 ( Don Bum Choi ),박찬우 ( Chan Woo Park ),왕종배 ( Jong Bae Wang ) 대한설비관리학회 2011 대한설비관리학회지 Vol.16 No.3

The ergonomic design approaches are not sufficient on the railway system especially on the locomotives` cab in Korea. Moreover, the specifications on the design are not provided as a legal condition. In this study, the domestic driver`s anthropometirc characterics were compared against the UIC`s design criteria used in the cab design. The problems come from drivers` physical characteristics are verified with the rolling stock running in Korea meeting the visibility and operability of the UIC`s. These studies including environmental factors (air conditioning, noise, vibration, control desk layout, seats etc.) are useful on estabilishing the design specification of the driver`s cab.

장애분석을 통한 레일결함관리에 관한 연구

최돈범 ( Don Bum Choi ),한순우 ( Soon Woo Han ) 대한설비관리학회 2012 대한설비관리학회지 Vol.17 No.2

Rail is one of very important parts which make up a railway system because it supports trains and guides the operation of trains. It experiences thermal stresses due to temperature changes and fatigue by the operating loads. In addition, various defects including wear, shelling and cracks occur in rails by interaction between wheel and rail. The propagation of these defects may lead to rail breaks and further to derailment accidents. Even in the case of incidents, economic losses occur through unscheduled rail replacements. Therefore, many counter measures have been taken in order to detect rail defects at early stage. In this paper, we will review the domestic management of rail defects, examine the factors affecting rail breaks through previous cases with a crack propagation scenario, and suggest improvement ways for setting rail inspection and failure management for early detection of broken rails.

유압실린더 조작밸브의 설계변수에 대한 특성연구

최돈범 ( Don Bum Choi ) 대한설비관리학회 2008 대한설비관리학회지 Vol.13 No.3

결함수목분석을 이용한 유압서보밸브의 고장원인 분석

최돈범 ( Don Bum Choi ) 대한설비관리학회 2010 대한설비관리학회지 Vol.15 No.4

For relatively large loads requiredprecise and automatic control, the hydraulic servo system is used. It has many difficulties to determine the cause of failures in the system because electrical controls and mechanical components are interconnected with a complexity. And ensuring reliable hydraulic servo valves to critical equipment is vital to the operation of many industrial, commercial, and military facilities. Despite of the importance of reliability and maintainability, it is impossible to perform actual testing on the system in general. In this paper, the reliability analysis model on the hydraulic servo valve are suggested based on the reliability of individual components which came from fault tree analysis especially if there are no reliability data like past or supplier`s data. The data and methodology presented here are very useful in determining the site reliability or availability.

열차제어시스템을 위한 전동차 제동특성 분석

최돈범(Don Bum Choi),오세찬(Sehchan Oh),김민수(Min-Soo Kim) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.12

본 논문은 수송량 증대를 위한 열차제어시스템의 안전거리 설계와 전동차 제동설계에 활용할 수 있는 제동모델을 제시한다. 제동모델을 위해 6량 1편성으로 운행되는 전동차의 제동특성을 시험하였다. 제동특성에 영향을 줄 수 있는 인자로는 마찰계수, 제동압력의 변화, 회생제동 등이 있으며 시험을 통해 확인하였다. 제동압력은 상용제동과 비상제동으로 구분하고 차량의 특성을 반영하였다. 주행하는 철도차량에 작용하는 외력은 주행저항을 측정 시험과 후처리 방법을 제시하고 있는 KS R 9217에 따라 시험을 수행하고 2차 다항식 형태로 해당 열차의 주행저항을 제시하였다. 차량의 재원, 마찰계수, 제동압력, 주행저항을 바탕으로 직선 평탄 선로를 주행하는 전동차의 동적 거동은 다물체 동역학 해석 소프트웨어를 이용하여 해석하였다. 해석결과는 상용제동과 비상제동에 대하여 시험결과와 비교 검증하였으며 상당히 합리적인 결과를 도출하였다. 검증된 모델은 제동초기 속도에 따른 정지거리를 분석하고 감속도 중심의 제동모델과 비교하였다. 또한, 운영기관의 마찰계수 한계치에 따라 열차제어시스템을 위한 안전거리는 변화할 수 있음을 확인하였다. 본 연구의 결과는 철도차량들을 연결하여 운행하는 열차의 동적 거동해석에 활용할 수 있을 뿐 아니라 차량 설계에서 제동에 영향을 미치는 다양한 선로환경 분석과 제동 성능향상의 기초자료로 활용할 수 있을 것으로 기대된다. This paper presents a braking model that can be used to design the safety distance of a train control system and a train braking system to increase the volume of traffic. For the braking model, a train set (electric multiple unit composed 6 cars) was tested. The factors that can affect the braking characteristics include the friction coefficient, braking pressure, and regenerative braking. The braking pressure was classified into service and emergency braking and reflected the characteristics of the vehicle. The external force acting on the running railway car was tested in accordance with KS R 9217, and the running resistance of the train is presented in the form of a polynomial. The dynamic behavior of the train running on a straight flat line was simulated using UM 8.3. The results were validated with experimental data, and the results were reasonable. With the validated model, a stopping distance was determined according to the initial braking speed and compared with the deceleration braking model. In addition, a safety distance for the train control system could be changed according to the frictional coefficient limits. These results are expected to be useful for analyzing the dynamic behavior of trains, and for analyzing various railway environments and improving the braking performance.

유압시스템에서의 진동제어를 위한 축압기의 특성 연구

최돈범 ( Don Bum Choi ) 대한설비관리학회 2009 대한설비관리학회지 Vol.14 No.1

열차 충돌/탈선사고 위험도 평가모델 개발

최돈범(Choi Don-Bum),왕종배(Wang Jong-Bae),곽상록(Kwak Sang-Log),박찬우(Park Chan-Woo),김민수(Kim Min-Su) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

Train collision and derailment are types of accident with low probability of occurrence, but they could lead to disastrous consequences including loss of lives and properties. The development of the risk assessment model has been called upon to predict and assess the risk for a long time. Nevertheless, the risk assessment model is recently introduced to the railway system in Korea. The classification of the hazardous events and causes is the commencement of the risk assessment model. In previous researches related to the classification, the hazardous events and causes were classified by centering the results. That classification was simple, but might not show the root cause of the hazardous events. This study has classified the train collision and derailment based on the relevant hazardous event including faults of the train related the accidents, and investigates the causes related to the hazardous events. For the risk assessment model, FTA (fault tree analysis) and ETA (event tree analysis) methods are introduced to assess the risk.

철도 안전을 위한 요건 관리시스템 개발

최돈범(Choi Don-Bum),왕종배(Wang Jong-Bae),박찬우(Park Chan-Woo),곽상록,김민수(Kim Min-Soo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

It is necessary to develop the requirement management system that could trace hazards and manage safety requirements for risk control of railway accident as low as reasonably practicable. In this paper, the requirement management system for control of railway accident risk is introduced. The requirement management system is containing the railway system configuration and safety activity related with identified hazards. The system shall be used to derive safety requirements for risk controland support the traceability of hazards on railway’s operation & management. In the future, the system will be applied in the areas such as risk assessment and management, performing safety assurance and revising national regulations etc. for continuous safety improvement in the railway.