Prediction of Theoretical Derailments Caused by Cross-Winds with Frequency

In this paper, theoretical derailment equations for cross-wind with frequency were derived to assess running safety. For a KTX (Korean high-speed train) unit, the wheel unloading ratios, which are criteria evaluating derailments in UIC (International union of railways) and TSI (Technical Specification Interoperability) regulations, calculated through formula under driving regulations according speeds, results compared evaluated multibody dynamics (MBD) simulation. addition, ratios various frequencies cross-winds. As result MBD, shown increase rapidly regardless dampers suspension when natural vehicle agreement. Finally, we changes ratio different track gauges found that these could calculate more accurate than existing Kunieda’s formula. The study has advantage considering variables, such as fluctuant cross-winds, rail irregularities, behaviors, not considered previous studies or It be used setting suspensions railway specifications initial design stage.