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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.
유원희(You Won-Hee),김재철(Kim Jae-Chul),문경호(Moon Kyung-Ho),서정원(Soe Jung-Won),팽정광(Paeng Jung-Goang) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
The object of this study is to investigate the effect of elastic wheel from the viewpoint of noise and vibration of railway vehicle. The vibration reduction was predicted from the FRF difference between elastic wheel and sol id wheel by FEM simulation. The elastic wheel and solid wheel Were compared in viewpoint of carbody vibration and car interior noise level. The effect of elastic wheel on the noise and vibration of subway vehicle was obtained. But, the application of elsatic wheel must be reviewed in some aspect.
유원희(You Won-Hee),신유정(Shin Yu-Jeong) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Nonlinear dynamic systems are well known to contain special additional phenomena compared with linear dynamic systems. Railway wheelsets are good example to explain such a special phenomena. Generally railway wheelset has two kinds of limit speed. One is linear limit speed and the other is nonlinear limit speed. The nonlinear limit speed is lower than linear limit speed. The methods to obtain nonlinear limit speed, experimental approach and analytical one based bifurcation theory. But the bifurcation theory is not simple. In this study, the perturbation method was introduced to nonlinear limit speed of wheelset. Moreover, the parametric study for limit speed was conducted.