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틸팅특성과 승차감을 고려한 틸팅열차의 곡선부 제한속도 평가
엄기영(Ki-Young Eum),엄주환(Ju-Hwan Um),여인호(In-Ho Yeo),유영화(Young-Hwa You) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
For the purpose of speed-up of conventional lines with many curves, the introduction and operation of tilting train is under process. Those are Joong-Ang, Jang-Hang and Ho-nam lines etc. Tilting trains can run a curve section faster than existing trains without a significant violation of passenger"s comfort and enable to reduce operating time in the lines with many curves. In this study, the trains speeds are evaluated, based on the alignment of conventional line, criteria for passenger"s comfort and investigated field conditions of the sections where the curves exist. Decision on whether the alignment(transition line) needs to be modified or not is also made. Relative efficiency on curve sections of tilting train to existing trains is approximately 50 % in average.
Yeo, In-ho(여인호),Yang, Hyo-sik(양효식),Rhee, JongMyung(이종명) 한국정보전자통신기술학회 2010 한국정보전자통신기술학회논문지 Vol.3 No.3
As the applications for Mobile Ad-hoc NETworks (MANETs) have varied, performance analysis has become one of the main research areas. They commonly offer only simple radio propagation models that neglect obstacles of a propagation environment. The radio wave propagation model has a strong impact on the results of the simulation run. In this paper we present the new experimental results of the impacts of the various propagation models on MANETs' performance. Intensive simulations have been presented using the group mobility which models typical ad-hoc situations such as military movements or disaster recovery activities under the supervision of a group leader. Comparisons of conventional simple models with more complicated models, i.e., shadowing, Raleigh, and Ricean models, show that, in spite of the models' popularity, the free space and two-ray ground models are too optimistic in describing real ad-hoc group mobility situations.
여인호(In-ho Yeo),이인규(In-kyu Lee),김성일(Sung-il Kim) 한국철도학회 2006 한국철도학회논문집 Vol.9 No.2
The regularity of railway track alignment is a crucial component for maintaining travel safety and the smoothness of passenger ride. The conventional spectral analysis has been considered to estimate the severity of the track irregularity from measured data. The time domain data used to be changed into the frequency domain by Fourier transform. Because the measuring points can be regarded as the time points, the spatial-frequency can be introduced instead of the time-frequency. Although FFT(Fast Fourier Transform) and/or PSD(Power Spectral Density) function could provide fairly localized information within frequency domain, but chronical configurations of data could be missed. In this study, we attempt to apply the Morlet wavelet transform for the purpose of a frequency-time-domain analysis rather than a frequency-domain analysis. The applicability of wavelet transform is examined for the estimation of the track irregularity with real measured track data on the section of Kyoung-bu line by EM-120 measuring vehicle. It is shown that the wavelet transform can be an effective tool to manage the track irregularity.
요소 세분화를 이용한 비적합 미끄러지는 접촉문제의 개선과 철도 사각암거 문제에의 적용
최찬용,여인호,정근영,이계희,Choi, Chan-Yong,Yeo, In-Ho,Chung, Keun-Young,Lee, Gye-Hee 한국전산구조공학회 2017 한국전산구조공학회논문집 Vol.30 No.5
차량-궤도 구조물 동적 상호작용해석은 차량의 접촉점이 보요소로 모형화된 레일 위를 일정한 속도로 주행하는 미끄러지는 접촉문제로 취급하였다. 하지만 Euler 보와 같은 고차 다항식의 형상함수가 적용된 유한요소를 사용할 경우 미끄러지는 접촉문제에서 적합조건을 만족하지 못한다. 이 연구에서는 유한요소해석프로그램이 미끄러지는 접촉문제에서의 적합조건을 만족시키지 못하는 것에 대한 해결법으로 주행로를 이루는 보요소를 보다 세분화하여 동적상호작용해석에서의 정확성을 확보하고자 하였다. 이를 위해 간단한 예제들을 통해 주행로를 이루는 보요소의 세분화 정도에 따른 동적상호작용해석의 거동을 분석하였으며, 해석 프로그램의 동적상호작용해석에의 적용성을 평가하였다. 마지막으로 사각을 갖는 철도 암거 접속부의 뒷채움재 설치 형식에 따른 차량주행시의 거동을 평가하기 위하여 동적상호작용해석을 수행하고, 접속부 뒷채움재 형식의 변경에 따른 지지강성의 변화에 의한 영향과 노반침하에 따른 궤도틀림의 영향을 비교분석하였다. The vehicle-track structure dynamic interaction analysis problem can be treated as sliding contact problem, and it is assumed that vehicle run at a constant speed over a rail modeled as beam elements. Unfortunately, Salome-Meca can not satisfy the compatibility condition for the beam master elements, which are consist of the elements with higher order polynomial shape function, in sliding contact problem. In this study, it is suggested to use more finer beam master element mesh as the remedy for incompatibility in sliding contact problem, and the accuracy of the solution is secured. For this, the effect of beam element mesh refinement consisting runway is analysed through simple examples, and the applicability to the dynamic interaction analysis is evaluated. Finally, the dynamic interaction analysis of railway skewed culvert transition problem is carried out to evaluate the effect of supporting stiffness due to backfill pattern changes and track irregularity due to uneven subgrade settlement.