Research on the Simulation of Wheelset Response Characteristic Identification of Railway Fastener Loosening

Figure 15

Calculation of the Hilbert energy entropy process. Firstly, varying vertical acceleration signals are gotten and then decomposed by OEMD3. Secondly, IMFS is selected based on correlation principle, which is calculated by Hilbert transform. Lastly, energy entropy theory is used to compute the energy in different looseness conditions.