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Railway axles are critical elements as train loads and travel speeds have increased over time, requiring more efficient non-destructive inspection methods. Here a novel online procedure based on empirical mode decomposition (EEMD) and optimized support vector machine (SVM) using axle-box vibration signals for multi-state estimation of axles is presented. The axle-box vibration signals are adaptively...
In order to investigate the change of time-frequency characteristics of vehicle/track/bridge coupling system caused by wheel tread reprofiling, a coupling model of vehicle/track/bridge system is developed, the empirical mode decomposition (EMD) and Hilbert-Huang Transformation (HHT) are introduced to the analysis of vibration signal. Based on the theory of vehicle/track/-bridge coupling dynamics,...
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