Dynamic response for critical velocity effect depending on track supporting stiffness

초록

The critical velocity effect on railway trackbed means the amplification of vibration energy when the train running-speed and group velocity of ground surface wave are superimposed. It is called a pseudo-resonance phenomenon of time domain. In the past, it is not issued because the train speed is low and the ground group velocity is higher. But since the high-speed train is introduced, critical velocity is reported as causing a track irregularity. So far, theoretical analysis has been performed because of the complexity of formation process. However, it requires reasonable consideration which is similar to the actual track and trackbed conditions. In the present paper, finite element analysis to verify the critical velocity effect is performed with the consideration of each track structure and trackbed supporting stiffness. As a result, the deformation amplification caused by the critical velocity effect is verified as the supporting stiffness and track supporting system.