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신병천(B. C. Shin),박도영(D. Y. Park),백진기(J. G. Beak),강흥식(H. S. Kang) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10
Korea's Urban Maglev Program (UMP) started in December 2006. The total program budget is expected to be 450 million US Dollars, including contributions from the private sector, Incheon International Airport (IIAC) and City of Incheon. The objectives of the program are to develop the competitive urban transit maglev vehicle and to construct a 6.1㎞ urban maglev demonstration line at Incheon International Airport by 2012. After the intensive tests for one year, revenue service will begin from 2013. A prototype urban maglev train composed of two permanently coupled vehicles were built and have been under test since March 2010. The current status of Urban Maglev Program, including some of preliminary test results of the prototype urban maglev train on 1.3㎞ test track will be presented in this paper
잔류응력 이완 및 Hot-Spot 응력을 고려한 용접부 피로수명 평가
한승호(S. B. Ban),이탁기(T. K. Lee),신병천(B. C. Shin) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The fatigue life of welded joints is sensitive to welding residual stress and complexity of their geometric shapes. To predict the fatigue life more reasonably. the effects of welding residual stress and its relaxation have to be considered quantitatively which are equivalent to mean stress by external loads. The hot-spot stress concept should be also adopted which can be reduce the dependence of fatigue strengths for various welding details. Considering the factors mentioned above, a fatigue life prediction model using the modified Goodman's diagram was proposed. In this model, an equivalent stress was introduced which are composed of the mean stress based on the hot-spot stress concept and the relaxed welding residual stress. From the verification of the proposed model to real welding details. it is confirmed that this model can be applied to predict reasonably their fatigue lives.
한승호(S. H. Han),강성보(S. B. Kang),신병천(B. C. Shin) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
It is well know that the strength and the life of welded components are affected extensively by the residual stresses distributed around their weldments not only under static loads, but also fatigue loads. The residual stress can be superimposed with externally applied loads, so that unexpected deformations and failures of members will be occurred. These residual stresses are not kept constant, but relaxed or redistributed during in service. Under static loads the relaxation takes place when the external stress superimposed with the residual stress exceeds locally the yield stress of material used. It is shown that under fatigue loads the residual stress is considerably relieved by the first or few cycle loading, and then gradually relaxed with increasing loading cycles. In this study the phenomenon and mechanism of the stress relaxation by mechanical means were investigated and a model to predict quantitatively the residual stress relaxation for the case of static and fatigue loading condition was proposed.
한정우(J. W. Han),한승호(S. H. Han),신병천(B. C. Shin) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
To predict fatigue crack growth direction, lots of theoretical and numerical investigations have been performed based on some criteria, ego the maximum tensile stress theory(MTS), the maximum energy release rate theory (MERR), the minimum strain energy density theory(MSED), and the elastic T-tenn criterion. In this study, FE analysis(ANSYS) was carried out for CTS(Compact Tension Shear) specimen in which inclined edge cracks are located 15, 45, and 75 degrees in loading direction under mixed mode loading. In addition, fatigue tests were performed on the CTS specimens. Crack paths calculated by the FE analysis in initial stage(eg. at fatigue pre-cracks) did not agree with the experimental results. To predict realistically the crack paths, it was concluded that the crack direction has to be calculated at each crack tip propagating cycle-by-cycle under fatigue loads.
Rail-Joint에서 퍼지룰을 기반으로하는 공극신호처리법
성호경(H.K. Sung),조정민(J.M. Jho),이종무(J.M. Lee),배덕권(D.K. Bae),김봉섭(B.S. Kim),신병천(B.C. Shin) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Maglev using EMS becomes unstable by unexpected big air-gap disturbance. The main causes of the unexpected air-gap disturbance are step-wise rail joint and large distance between rail splices. For the stable operation of the Maglev, the conventional system uses the threshold method, which selects one gap sensor among two gap sensors installed on the magnet to read the gap between magnet and guide rail. But the threshold method with a wide bandwidth makes the discontinuous air-gap signal at the rail joints because of the offset in air gap sensors and/or the step-wise rail joins. Further more, in the case of the one with a narrow bend-width, it makes Maglev system unstable because of frequent alternation. In this paper, a new method using fuzzy rule to reduce air-gap disturbances proposed to improve the stability of Maglev system. It treats the air-gap signal from dual gap sensors effectively to make continuous signal without air gap disturbance. Simulation and experiment results proved that the proposed scheme was effective to reduce air-gap disturbance from dual gap sensors in rail joints.
성호경(H.K. Sung),조정민(J.M. Jho),이종무(J.M. Lee),배덕권(D.K. Bae),김봉섭(B.S. Kim),김동성(D.S. Kim),신병천(B.C. Shin) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
Maglev using EMS becomes unstable by unexpected big air-gap disturbance. The main causes of the unexpected air-gap disturbance are step-wise rail joint and large distance between rail splices. For the stable operation of the Maglev, the conventional system uses the threshold method, which selects one gap sensor among two gap sensors installed on the magnet to read the gap between magnet and guide rail. But the threshold method with a wide bandwidth makes the discontinuous air-gap signal at the rail joints because of the offset in air gap sensors and/or the step-wise rail joins. Further more, in the case of the one with a narrow bend-width, it makes Maglev system unstable because of frequent alternation. In this paper, a new method using fuzzy rule to reduce air-gap disturbances proposed to improve the stability of Maglev system. It treats the air-gap signal from dual gap sensors effectively to make continuous signal without air gap disturbance. Simulation and experiment results proved that the proposed scheme was effective to reduce air-gap disturbance from dual gap sensors in rail joints.