Running safety evaluation for railway vehicle applying active steering technology

In order to analyze the effect of active steering on running behavior when using active steering technology to improve poor steering performance of existing railway vehicles, a test run with an active steering bogie was conducted. As a result of the test, it was found that the lateral force and derailment coefficient of the wheel tend to decrease significantly due to the active steering control. Especially, the reduction effect is large in curved sections with small radius of curvature. According to the active steering control, the derailment coefficient is remarkably reduced to about one third of that of the passive state. The wheel lateral force is significantly reduced and the lateral force distribution is distributed to a more stable region than is the case in the passive state. Although the wheel unloading ratio with active steering control did not change much, the reduction of the wheel unloading ratio was slightly improved. Therefore, it has been confirmed through experiments that active steering technology has the effect of not only reducing the transverse pressure in curved sections but also improving derailment safety.