Time-frequency Analysis of Track Irregularity Based on Orthogonal Empirical Mode Decomposition
Abstract: A method of
extracting transient features of a non-stationary signal was proposed based on
the combination of orthogonal empirical mode decomposition (OEMD) and the
Hilbert transform. After obtaining orthogonal intrinsic mode functions, the
instantaneous frequency and amplitude can becalculated, so problems existing in
the original Hilbert-Huang Transform (HHT) method, such as modealiasing, can be
solved. The track irregularity signal is studied with the OEMD method, and the
statisticaland analytic result indicates that there are relatively serious
short wave and long wave track irregularitiesin the sample signal. Analysis of
track irregularities using OEMD is a new technical method for guaranteeing the
safe running of railway.
Keywords: track irregularity,
orthogonal empirical mode decomposition, Hilbert transform, time-frequency analysis
Author: Ling Zhao
Journal Code: jptkomputergg160062
