The Korean High Speed Train (KHST) has been tested on the Kyongbu high speed line and
the Honam conventional line since 2002. A data acquisition system was developed to test and prove
the dynamic performance of the KHST, and the system has been found to be very efficient in
acquiring multi-channel data from accelerometers located all over the train. Also presented in this
paper is an analysis procedure which is simple and efficient in analyzing the acceleration data
acquired during the on-line test of the KHST. The understanding of system vibration mode for a
railway vehicle is essential to evaluate the characteristics of a dynamic system and to diagnose the
dynamic problems of the vehicle system during tests and operations. Methods based on homogeneous
linear systems are not realistic because real systems have nonlinear characteristics and are strongly
dependent on environmental conditions. In this paper an efficient method of vibration analysis has
been proposed and applied for the KHST to evaluate its vibration mode characteristics. The results
show that this method is suitable to estimate the system vibration modes of the KHST.
Stability and dynamic performance improvement of a sensorless IPMSM drive via adaptive estimated-speed-assisted position prediction and current quality evaluation