A Study on the Prediction of Vibration Characteristics of EMU High-Speed Trains by Speed

An increase in speed of train operation has been planned to prepare for the end of the KTX service life in accordance with the "400-km/h Master Plan." The development of high-speed railway vehicles exceeding 350 km/h is necessary, and it is important to analyze vibration characteristics, which have a significant impact on passenger safety and riding comfort. Also, it is essential to set a direction for improvement. A prediction study was carried out for the vibration characteristics that may occur in electric multiple unit (EMU) high-speed trains at running speeds exceeding 350 km/h. To this end, EMU high-speed trains consisting of two coaches and six locomotives were modeled using SIMPACK software. Measured data during a test run were used to verify this model. Using the verified analysis model, vibration characteristics were predicted and analyzed for each speed from 200 km/h to 400 km/h. Vibration increased linearly with speed, but even at a speed of 400 km/h, the vibration characteristics were much lower than the limit values specified in the EN 14363 standard. In addition, it was confirmed that riding comfort could be achieved using the mean comfort method of EN 12299.