• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.139-144
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• 2004

Since the braking system of rolling stock is directly linked to it's safety, ensuring reliability of braking system and evaluation of performance of it are very important. To develope the performance of braking system, it is required advanced technology and gradually various factors in the field test result This study is designed to analyze various factors about braking force in rolling stock, also, by comparing braking force of KTX with that of high speed train. The study suggests to establish a method of computation of braking force suitable for high speed train having a lot of trouble in calculating braking distance by diversification of patterns of braking system such as the train of speed up and introduction of electric and pneumatic braking system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.855-857
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• 2000

Brake system using eddy current is adequate to obtain safe braking force in high speed transportation system and electric vehicle etc. In this paper, we propose the new type eddy current braker using Halbach array. which compared with the conventional permanent magnet array. The airgap flux density of Halbach array is higher 25% then conventional array, therefor we can predict that braking force is much large 1.56 times then conventional array.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.2564-2566
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• 2000

HILS(Hardware In-the-Loop Simulation) is an effective tool for design, performance evaluation and test of developed vehicle subsystems such as ABS(Antilock Brake System), suspension, and steering systems. This paper describes a HILS model for an ABS/ASR application. Also the implementation of HILS system for performance test of the ABS ECU(Electronic Control Unit) for commercial vehicles is presented.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2017년도 전력전자학술대회
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• pp.403-404
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• 2017

In an electric vehicle driving system, the regeneration power charging the battery with electricity is applied as the driver controls the brake. This paper is proposed a torque compensation algorithm that can regenerate due to extend regeneration area at the low speed of EV system. In order to verify the proposed method, PSIM simulation is performed and it is confirmed that regeneration occurred the proposed method is regenerated at low speed by comparing the existing method with the proposed method.

• Ocean Systems Engineering
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• 제9권1호
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• pp.1-19
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• 2019

Latching control was applied to a Wave Energy Converter (WEC) buoy with direct linear electric Power Take-Off (PTO) systems oscillating in heave direction in waves. The equation of the motion of the WEC buoy in the time-domain is characterized by the wave exciting, hydrostatic, radiation forces and by several damping forces (PTO, brake, and viscous). By applying numerical schemes, such as the semi-analytical and Newmark ${\beta}$ methods, the time series of the heave motion and velocity, and the corresponding extracted power may be obtained. The numerical prediction with the latching control is in accordance with the experimental results from the systematic 1:10-model test in a wave tank at Seoul National University. It was found that the extraction of wave energy may be improved by applying latching control to the WEC, which particularly affects waves longer than the resonant period.

• 한국안전학회지
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• 제32권3호
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• pp.117-122
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• 2017

In this study, we studied the ride quality considering the deterioration effects of the three type couplers (single, double, and ring types) for EMUs. In order to know the impact occurred when an urban transit vehicle is under breaking, we tested the conditions of the service brake and the emergency brake. Normal coupler models without any slack showed similar dynamic performance results under all breaking conditions. But if the couplers become old, the initial pre-stresses are removed because of permanent compressive deformation in rubber. For three types of the old coupler models without the initial pre-stress, we evaluated dynamic performances of each type. As the results, the maximum and average acceleration levels of the double type and the ring type were similarly low in all conditions. But the accelerations of the single type coupler was high when compared to those of the double and ring types. In addition, Jerk value of the single type model associated with ride quality was high up to 15 times to the ring type in condition of the service braking in empty vehicle weight. Jerk value of the double type model was high up to 6 times to the ring type.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제6권4호
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• pp.167-176
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• 2017

자동차 산업이 급격히 발달하면서 각종 인명손실을 예방하기 위한 정책 및 안전장치가 늘어나고 있다. 트렌드의 일환으로 2011년에 차량의 전기전자시스템의 기능안전성을 확보하기 위한 ISO26262 $1^{st}$ edition이 릴리즈 되었으며, 2016년 하반기에 $2^{nd}$ edition이 릴리즈 될 예정이다. ISO 26262에서는 안전 요구사항에 대해 Walk through, 인스펙션, 준정형 검증, 정형 검증을 통해 전기전자시스템 요구사항에 대한 검증을 요구하고 있다. 본 논문에서는 ASIL (Automotive Safety Integrity Level) D등급의 전자식 주차 브레이크 양산 프로젝트의 전기전자시스템 요구사항 검증에 모델검증을 적용함으로써 전기전자시스템 요구사항 검증 시 모델검증의 효율성을 기술한다.

• Smart Structures and Systems
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• 제29권5호
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• pp.653-660
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• 2022

Gravel scattering that is generated during operation of high-speed railway vehicle is cause to damage of vehicle such as windows, axle protector and so on. Especially, those are frequently occurred in winter season when snow ice is generated easily. Above all, damage of vehicle windows has not only caused maintenance cost but also increased psychological anxiety of passengers. Various methods such as heating system using copper wire, heating jacket and heating air are applied to remove snow ice generated on the under-body of vehicle. However, the methods require much run-time and man power which can be low effectiveness of work. Therefore, this paper shows that large-area heating system was developed based on heating coat in order to fundamentally prevent snow ice damage on high-speed railway vehicle in the winter season. This system gives users high convenience because that can remotely control the heating system using IoT-based wireless communication. For evaluating the applicability to railroad sites, a field test on an actual high-speed railroad operation was conducted by applying these techniques to the brake cylinder of a high-speed railroad vehicle. From the results, it evaluated how input voltage and electric power per unit area of the heating specimen influences exothermic performance to draw the permit power condition for icing. In the future, if the system developed in the study is applied at the railroad site, it may be used as a technique for preventing all types of damages occurring due to snow ice in winter.

• 한국철도학회논문집
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• 제13권2호
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• pp.166-172
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• 2010

현재 전기철도에서는 고성능 유도전동기를 사용하고 있어서 열차속도제어를 위해 벡터제어를 이용하고 있다. 또한 최근에 인버터와 제어이론의 개발로 인해 다양한 방법으로 유도전동기 제어가 가능하다. 현재 유도 전동기를 사용하는 철도차량은 교류전동기를 이용한 역행, 역상제동 및 회생제동 등이 가능하다. 따라서 다양한 방법을 적용하기 위해서는 모터블록과 유도전동기의 모델이 필요하다. 유도전동기의 제어 방법으로는 가변 전압운전, 가변주파수 운전을 통하여 유도전동기의 토크와 회전수를 제어한다. 철도차량 추진시스템은 많은 서브시스템을 가지고 있어 속도제어 성능을 해석하기가 매우 복잡하다. 본 논문에서는 유도전동기를 사용하는 철도차량 추진시스템을 대상으로 Matlab/Simulink를 이용한 속도제어 특성을 분석하였고, 일정시간에 부하에 대한 외란입력응답 특성을 해석하였다. 또한 철도차량 추진시스템의 속도제어 특성을 해석하기 위해 전류, 속도, 자속추정기 및 유도전동기 모델을 제시하였다.

• 한국철도학회논문집
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• 제12권2호
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• pp.254-259
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• 2009

국내 도시철도시스템에서 채용한 직류급전시스템에서 다이오드 정류시스템을 사용하여 역방향 조류가 불가능하다. 이에 따라 전동차의 감속 또는 제동시에 발생하는 회생 전력을 재활용하지 못하고 열에너지로 소비하게 된다. 잉여 회생 전력의 재활용은 에너지 이용의 극대화, 전동차의 제동 성능 향상 및 분진 감소 등의 환경 친화적인 효과를 얻을 수 있으며, 정류기와 역병렬로 인버터를 설치하여 타 계통으로 전달하거나 저장하는 형태로 가능하다. 본 논문에서는 발생한 잉여 회생 전력을 교류 전력으로 변환하여 고압배전계통이나 한전 계통으로 역송전이 기능한 회생용 인버터의 시험 설비 개발 및 성능시험에 대하여 제안하였다. 회생용 인버터 개발 후 개발품의 성능 시험을 위하여 직류급전시스템을 모의할 수 있는 교/직류 전원 설비 및 부하설비를 이용하여 회생용 인버터의 고유 성능을 시험 및 분석하였다.