승차감 향상을 위한 400㎞/h급 고속철도 현가장치의 최적화

Problem of vibration is expected since a high speed train under development has a non-articulated bogie, EMU(electric multiple units) and faster maximum speed, 400㎞/h, than existing one. To obtain ride comfort in high speed, it has been done to optimize the vertical suspension of 1 volume high speed EMU having maximum speed 400km/h in frequency domain. 10 DOF vertical model was designed and composed of a carbody, two bogie and four wheelsets. Input is vertical PSD(Power Spectral Density) of rail irregularities. Transfer function of a system was derived in frequency domain. Objective function consists of a frequency weight function, PSD of rail irregularites and transfer function of system. Optimal design values of suspension were determined using a optimal algorithm. The results were verified using simulation.