KHST(Korean High-Speed Train, 350㎞/h), composed of 7 cars that are 2 power cars, 2 motorized car and 3 trailer cars, has been developed and is under on-line test. To verify hte design requirements about the functions and traction performances of this train, KRRI(Korea Railroad Research Institute} decided to evaluate traction performances of the train during on-line test. For this purpose, such as torque, velocity, voltage and current, must be measured. KRRI has developed the measurement system that can be measured vast and various signals effectively. In this paper, we introduce traction performances of KHST. The traction measurement items are focused on the verification of motor block performances.
Korean High Speed Train (KHST) designed to operate at 350㎞/h has been tested on high speed line in JungBu site since it was developed in 2002. The dynamic performances of railway vehicle are generally stability. safety and ride comfort. The stability performance of KHST was proved that it is stable at 400㎞/h through Roller Rig test. The safety and ride comfort need to be predicted the capability of it at 350㎞/h by the on-line test because KHST is testing at 300㎞/h up to now. Therefor, in this paper, the safety and ride comfort at 350㎞/h are predicted the performance using the acceleration results at 300㎞/h and these results show that the KHST's dynamic performances are very good. Also, it illustrate the two cases occurred the abnormal vibration of KHST during some on-line tests. The first case is that the variation of vertical acceleration of wheel is analyzed when an abrasion occur on wheel. The second case is that the lateral acceleration of wheel, bogie and body are analyzed when the KHST is unstable at high speed. The occurrences of these special phenomena were due to the some faults of the suspension and braking systems and the faults were improved. In present, it is testing with safety.
This paper deals with the feasibility study of a reduced-weight filter reactor for urban electric multiple (EMU) by increasing the max. current density of the coil conductor. A prototype of which current density was designed to be 50 % higher than conventional one was prepared and tested. The test current condition was defined from the operation pattern of the EMU. The results showed that the prototype can be satisfied with the temperature requirement. In this study, we concluded that the weight of filter reactor could be reduced by about 20 %.
Ultra-speed tube train, which runs in vacuum atmosphere to overcome aero-dynamic dragging force, is considered as a high-speed ground transportation system to back up long-distance air travel. To realize the ultra-speed tube train, feasibility study of currently available Maglev technologies especially for propulsion and levitation system is needed. Propulsion by linear synchronous motor(LSM) and levitation by electro-dynamic suspension(EDS) which are utilized in the Japan's MLX system could be one of candidated technologies for ultra-speed tube train. In the LSM-EDS system, the key component is superconducting magnet, and its reliability and performance is very important to guarantee the safe-operation of Maglev. As the initiative of the feasibility study, this paper deals with the basic structure of superconducting magnet and core technologies to design and operate it. And by surveying the current R&D achievement in Korea, the nation's capability to develop advanced superconducting magnet for Maglev is presented.
In this paper, we is studied for traction performances of KTX. Main transformer of this train are compose of 3 motor blocks. In order to this test is developed measurement system. Using this system, we obtained important result for running speed, acceleration, axle speed, transformer oil temperature.
본 논문에서는 초고속 자기부상철도 추진 제어에 필수적인 차량의 위치검지에 있어서 위치신호 송신지연 및
송신주기가 추력에 미치는 영향을 수치적으로 분석하고 test bed를 이용한 실험을 통해 이를 확인하였다. 위치신호 송
신문제를 해결하기 위한 방안으로서 위치신호 보상 및 추정 기법을 제시하였으며 제시된 방법을 test bed에 적용하여
효용성을 검증하였다. 적용 결과 추력이 크게 증가하였으며 이에 따라 차량의 가속도 및 속도 성능이 향상됨을 확인
하였다. 본 방법은 향후 개발 예정인 한국형 초고속 자기부상철도의 위치검지시스템에 효과적으로 사용될 수 있을 것
으로 판단된다
This paper gives a description of the methods and principles of measuring the guideway irregularity through use air-gap and acceleration signal in levitation system of electromagnetic suspension type Maglev. The data obtained from the measurement devices such as a gap sensor and an acceleration sensor in levitation system are transformed into absolute gap and relative gap. These data are used for measuring the guideway irregularity. In this paper simulation results show that the proposed method is reasonable.
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