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철도차량 2 차 횡댐퍼 및 궤도특성에 따른 차체 횡변위 변화 연구
유원희(Wonhee You),신유정(Yujeong Shin),허현무(Hyunmoo Hur),박준혁(Joonhyeok Park) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4
In railway vehicle, riding comfort depends mainly on the secondary lateral damper and track condition. When the damping force of lateral damper becomes abnormal condition or the track condition is worse, the running stability and ride comfort of the railway vehicles go down. In addition, the lateral motion of carbody is increased. Therefore, the lateral motion of carbody is reviewed carefully by considering lateral damping force and track condition of the railway line in design stage. In this study, the lateral displacement of carbody was studied in accordance with lateral damping force and track condition. The target vehicle is EMU for subway line.
유원희(Wonhee You),신유정(Yujeong Shin),허현무(Hyunmoo Hur),박준혁(Junhyuk Park) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
The maximum speed is one of the most important performance in high speed railway vehicle. The higher the train speed is, the worse the ride comfort is. In order to solve this problem, a semi-active or active suspension can be applied to high speed railway vehicle. The variable damper with hydraulic solenoid valve is used in the semi-active suspension. But the variable damper with hydraulic solenoid valve requires tank for supplying fluid. The MR(Magneto Rheological) damper can be considered instead of hydraulic variable damper which needs additional device, I.e. reserver tank for fluid. In the case of active suspension, hydraulic actuator or electro-mechanical one is used to suppress the carbody vibration in railway vehicle. In this study the MR damper and electro-mechanical actuator was considered in secondary suspension system of high speed railway vehicle. The dynamic analysis was performed by using 10-DOF dynamic equations of railway vehicle. The performance of the semi-active suspension and active suspension system were reviewed by using MATLAB/Simulink S/W. The vibration suppression effect of semi-active and active suspension system were investigated experimentally by using 1/5-scaled railway vehicle model.
섭동법에 의한 캡슐열차용 대차의 상하방향 불안정성 연구
유원희(Wonhee You),이진호(Jinho Lee),이창영(Changyoung Lee) 한국소음진동공학회 2019 한국소음진동공학회 논문집 Vol.29 No.1
A levitation and propulsion system of a 1000 km/h subsonic capsule train is built on. The same conceptual basis as that used by electrodynamic suspension (EDS) levitation trains equipped with an electromagnetic coil on the side walls. The characteristics of the levitation spring of the capsule train are, therefore, the same as those of the levitation spring of the EDS levitation train, with both the linear spring and the nonlinear spring present simultaneously, and the spring constants varying by train speed. This is a phenomenon caused by an 8-shaped coil installed on the side wall of the guideway, which is expected to have a considerable influence on the vertical movement of the capsule train. In this study, the effect of the nonlinear characteristics of the floating springs on the EDS floating capsule train were investigated. The governing equations of the capsule train bogie were derived by consideration of the linear and nonlinear characteristics of the levitation springs. The influence of the nonlinear characteristics of the levitation springs on the instability of the system was analyzed theoretically using the perturbation method.