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PRT차량의 Rolling 감소를 위한 Anti-roll bar의 적용 연구
김현태(Hyuntae Kim),구정서(Jeongseo Koo),김준우(Junwoo Kim),조정길(Jeonggil Cho),정락교(Raggyo Jeong),강석원(Seokwon Kang) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
본 논문에서는 PRT 차량의 Rolling 감소를 위해 Anti-roll bar 를 적용하여 동특성 분석을 진행 하였다. 다물체 동역학 프로그램인 Adams/car 를 이용하여 Anti-roll bar 를 모델링하여 ISO 3888 (Double Lane Change test)를 진행하였다. 그 결과, 앞뒤 현가장치 모두 Anti-roll bar 를 장착한 경우 가장 큰 감소율을 보였다. Anti-roll bar 를 장착하지 않은 경우 대비 Roll displacement 의 경우 30.4% 감소 Roll rate 의 경우 29.5% 감소를 보였다. 차량의 주행안정성에 영향을 미치는 Side slip angle 의 경우도 12.5% 감소 하였다. 그러나 Antiroll bar 를 장착한 경우에 횡가속도 와 Yaw 가 증가 하였으나 그 차이는 거의 없다. In this paper, we performed the dynamic analyses of a PRT vehicle model with anti-roll bars to decrease rolling motions. The PRT vehicle with anti-roll bars was simulated according to the ISO 3888, Double Lane Change test, by using the multi-body dynamics software. As the result, the roll angle of the PRT vehicle with anti-roll bars on the front and rear suspension was the smallest when compared with the cases with one anti-roll bar or without any anti-roll bar. A roll displacement and rolling rate could be reduced by 30.4% and 29.5% respectively. The side slip angle, which affects vehicle running stability, was reduced by 12.5%. Although the lateral acceleration and the yawing angle were increased, the increases of these values were small and negligible.
Filament winding 공법 GFRP 원형튜브의 에너지 흡수특성에 관한 연구
김거영(Geoyoung Kim),구정서(Jeongseo Koo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, quasi-static crushing tests of circular tubes under axial compression load are conducted to investigate the energy absorption characteristics. Circular tubes used for this experiment are glass/epoxy(GFRP) composite tubes, which is fabricated by the filament winding method. One edge of the composite tubes is chamfered to reduce the initial peak load and to prevent catastrophic failure in collapse situations. Two suggested trigger mechanisms for the composite tubes are investigated. Crushing modes are mainly affected by thickness/diameter ratio and average crushing loads are mainly affected by their cross-sections. Energy absorption characteristics vary significantly as a function of the tube geometry, trigger mechanism, t/D ratio and cross-sectional shape.
열차의 1차원 충돌 동역학 모델과의 비교를 통한 2차원 모델의 검증
김거영(Geoyoung Kim),구정서(Jeongseo Koo),정현승(Hyunseng Jung) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Through this study, 2D multibody dynamics models for analysis of train collisions have been verified by the comparison of the 1D dynamic model of the KHST(Korean High Speed Train). The main crushable sections of 2D dynamic model are composed of two nonlinear spring made out of crush characteristic of 3D KHST. 2D model can evaluate overriding phenomena, impact force of spring coupled by bogie in train collision. In order to compare of 1D dynamic model, Two dynamic models are made out of same crush characteristic and length in a same section. also 2D model constraints displacements of gravity direction. The collision accident scenarios is a train-to-train collision at the relative speed of 36 kph in the crashworthiness regulation. It is shown from the simulation results that the analysis results of 2D model is similar with the 1D model.