A STUDY ON THE METHOD OF VIBRATION ANALYSIS FOR KOREAN HIGH SPEED TRAIN BY ON-LINE TEST

초록

Korean High Speed Train (KHST) has been tested on Kyongbu high speed line and Honam conventional line since it was developed in 2002. The data acquisition system was developed for testing to prove the dynamic performance of KHST. This system was consist of the National Instrument PXI modules with networking system connected to main computer and the test programs coded by LabView 6i. This paper shows that this system is efficient to acquire the test data through the multi-channels from the accelerometers located in long distance places. It is flexible to change and add channels according to the various data acquisition requirement. The dynamic analysis of on-line test is very complicate because the environmental and running conditions are unsteady and effective to the test results. So, the analysis method should properly be set up to estimate its performance. This paper shows graphically that the proposed procedure considered the running condition is efficient and simple over the analysis of the accelerations of the bogie frame which are acquired during the on-line test for KHST. The recognition of system vibration mode for railway vehicle is essential to understand the characteristics of design for dynamic system and diagnose the dynamic problems of vehicle system during test and operation. But, up to now, the theoretical results are too reliable to apply to real design problem, because it is theoretically based on the homogeneous linear system although the real system have the nonlinear characteristics and vary by the environmental conditions. In this paper, it is proposed the efficient method of vibration analysis for rail vehicle system and this method apply to KHST to know the vibration mode characteristics of it. The results show that this method is able to make the system vibration modes of KHST clear.