• 한국철도학회논문집
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• 제7권3호
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• pp.232-238
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• 2004

The dynamic characteristics of the current collection process of the high-speed railway are investigated through signals acquired during a test run. The signals are obtained from accelerometers, load cells, and strain gauges attached to various positions of the pantograph, and they are processed in time-and frequency-domains to obtain the dynamic characteristics. The main natural frequency of the pantograph is found to be 8.5Hz. There also are components at low frequencies varying linearly with the train speed. The contact frequency components above 20Hz is attenuated as they pass through the secondary suspension. The main frequency component of the load cell signal is found to be related with the rolling motion of the panhead generated by the stagger in the catenary.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 추계학술대회 논문집
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• pp.636-651
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• 2000

In these days, SNCF replace the connector wire (M-T type) with a dropper has a equivalent role and function of the one in general lines of TGV, and change the connector wire (T-T-M-M-T-T, T-T-M-M-T type, etc) into a New one has more flexible cable in parallel lines (air section air joint, etc) of TGV. The Connector wire has many problems according to a flow of excessive circulation current (or traction current) and a sudden rise of temperature on catenary when electric locomotive is running in high speed. To solve the question at issue of the connector wire in high speed railway catenary system of Fiance, SNCF return their operating experience in TGV lines to design and execution of catenary system Therefore, we have to deal with the question in design and execution of catenary system for kyoungbu HSR line because we will spend a lot of time and more money for maintenance than for construction of that.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.824-828
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• 2007

With increasing interest in the reduction of cost for operation and maintenance of overhead catenary system, various methods of condition monitoring have been developed and used in with high-speed analysis and advanced image processing techniques. This study utilizes a high-speed camera as inspecting system to measure the wear, stagger, hight and arc extinguishing test of overhead catenary system. All measuring image were captured by a high speed CMOS camera with PCI express output, which can acquire up to 1000 frames per second with the resolution 1024 × 1280 pixels. Line type laser source with a power equal to 300 mW and the National Instrument LabVIEW (8.0) based on vision acquisition software have been used in application programming interface for image acquisition, display, and storage. The proposed high-speed camera system is finally applied to measure the overhead catenary system showing promising on-field applications

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.1583-1584
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• 2015

최근 철도차량의 고속화와 전력회생을 하는 전기차로 인하여 부하전류와 고장전류 간의 큰 차이가 없으므로 이를 구분할 수 있는 고성능 보호시스템의 중요성이 날로 증대되고 있다. 본 논문은 실계통에서의 전차선로 임피던스를 이용하여 AT급전시스템을 모델링하였으며 변전소와 보조급전구분소사이 단락사고의 과도특성을 분석하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.665-674
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• 2006

This paper presents the optimal design of a high-speed (200[km/h]) Linear Synchronous Motor which will be used as a propulsion system of a dynamic tester for catenary-current collection used in railways. Motor performance, especially detent force minimization on various design schemes has been investigated in detail by using FEM (Finite Element Method). Simulation-based DOE (Design of Experiments) method is also applied in order to reduce the large number of analysis according to each design variable and consider the effect among variables. The optimal design in all aspects is proposed by an optimization algorithm using a regression equation derived from the simulation-based DOE and the performance is verified by FEM.

• 한국항해항만학회지
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• 제34권8호
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• pp.623-628
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• 2010

현재 모형선을 이용한 선형성능 검증설비는 예인수조와 회류수조 두설비가 주로 이용된다. 이들 설비는 주로 저속 대형선박을 위해 기법들로 소형 고속어선 및 고속레저선박의 저항성능 평가를 수행하기에 전차의 속도와 유속이 목표속도에 미치지 못해 어려움이 존재한다. 따라서 고속 선박의 저항성능 평가를 위해 새로운 기법 정립 연구가 필요하다. 이에 고속선의 저항성능 시험을 위해 실제 해상에서 선박을 이용한 모형시험을 고안하고 측정시스템을 구성하였다. 시스템구성은 총 8개의 파트로 구성되어 있으며, 시스템 검증을 위해 C.W.C에서 저속선의 모형을 이용하여 시험을 수행하여 시스템 적용 가능성을 검증하였다. 또한 실제 해상에서 고속선 모형선을 이용하여 시험을 수행하였으며, 이 결과를 CFD해석 결과와 비교하여 실해상 모형시험 방법의 가능성을 확인 하였다.

• 한국철도학회논문집
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• 제8권4호
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• pp.342-347
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• 2005

The Korean High-Speed Train(HSR 350x) had been developed by through 'G7-R&D project' in 1996-2002, and has been testing and evaluating it's reliability on the high-speed line until now. A number of core equipments designed and developed by using domestic technologies were boarded on the HSR 350x. In order to verify the performance of HSR 350x and core equipments such as traction system, brake system and pantograph, sophisticated testing and evaluating procedures should be considered and applied. In this paper, the tested and analysed results about the dynamic characteristics of HSR 350x pantograph are introduced in a view point of the mean contact force and it's variation trend, criterion of current collection, and up-lifting of contact wire when the MSR 350x running up to 350 km/h. Through the test and evaluation, we verified that HSR 350x pantograph had an excellent current collection performance and good dynamic characteristics as it had been designed.

• 대한조선학회논문집
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• 제51권5호
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• pp.349-355
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• 2014

The resistance test of a high speed craft such as planing ship is performed with a high speed towing carriage instead of ordinary towing carriage because of the speed limitation. In the resistance test using high speed towing carriage, the model ship is fixed to the carriage to restrain the running attitude for enough measuring time. Such method is called fixed model test method. In the fixed model test method, to get the appropriate running attitude, the model test is iteratively repeated until the trim moment and lift force are close to zero. In this research, trim free model test method is investigated to reduce the number of iteration. And, the limitation of towing speed range in the trim free model test method is investigated.

• 한국항해항만학회지
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• 제31권10호
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• pp.813-818
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• 2007

선박의 선형시험설비로는 회류수조, 예인수조 등이 있으나, 소형 고속선박은 실선 대응 모형선의 축적비가 대형선에 비해 매우 작고 수조의 유속과 예인전차의 속도제한으로 고속선의 설계선속까지의 성능검증에는 한계로 작용하였다. 이에, 고속 활주형선의 선형시험 검증을 위해 실 해상모형시험기법을 정립하였다. 한편, 고속 Stepped Hull선형은 일체형 활주형 선저선형에 비하여 고속 주행시 공기공급에 따른 접수면 감소로 인하여 저항감소에 따른 속도향상과 연비절감 효과가 있으나, 선미 좌우측의 접수면 감소에 따른 횡동요 안정성이 감소되는 경향이 있다. 이에, 본 논문에서는 고속 선형시험이 가능한 해상모형시험을 이용하여 선미 보조동체 장착 유무에 따른 고속 Stepped Hull 선형의 횡동요 및 저항특성을 비교, 분석한 것이다.

• 한국소음진동공학회논문집
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• 제21권5호
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• pp.461-467
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• 2011

This study aims to create a numerical analysis model which can investigate the dynamic interaction between pantograph and overhead contact wire used for a high-speed railway vehicle, and validate the simulation results according to EN 50318 standard. Finite element analysis models of pantograph and overhead contact line are created using SAMCEF, a commercial FE analysis program. The mean, standard deviation, maximum and minimum values of contact forces are obtained. The simulation results are validated according to EN 50318, and the possibility of simulating the collecting characteristic of an actual pantograph system by using the developed model is discussed.