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Wheel-Rail Contact-Induced Impact Vibration Analysis for Switch Rails Based on the VMD-SS Method.

Pan Hu1, Haitao Wang2, Chunlin Zhang3

  • 1School of Electrical Engineering, Nantong University, Nantong 226019, China.

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Summary
This summary is machine-generated.

This study introduces a new method using variational mode decomposition (VMD) and spectral subtraction (SS) to accurately extract impact vibrations from damaged train rails. This technique enhances structural safety by improving the analysis of complex wheel-rail interactions.

Keywords:
SSVMDimpact vibration analysisvelocity effectwheel—rail contact

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Area of Science:

  • Railway engineering
  • Vibration analysis
  • Structural health monitoring

Background:

  • Damaged switch rails cause unsteady wheel-rail contacts, leading to impact vibrations that threaten train safety.
  • Non-stationary vibrations from complex rolling contact excitations complicate the extraction and analysis of impact vibrations.

Purpose of the Study:

  • To propose and validate a novel method for extracting impact vibrations caused by rail head damage.
  • To improve the analysis of wheel-rail contact states and enhance structural safety in railway systems.

Main Methods:

  • Utilized variational mode decomposition (VMD) to decompose impact vibrations into stationary intrinsic mode function (IMF) components.
  • Applied spectral subtraction (SS) for further filtering of impact vibrations.
  • Employed time domain feature analysis to estimate wheel passage moments and correct vehicle velocities.

Main Results:

  • The proposed VMD-SS method effectively extracts impact vibrations from damaged rails, even in low-velocity scenarios.
  • Frequency features of impact vibrations were concentrated in the 3500-5000 Hz range.
  • Impact vibration frequency and peak-to-peak amplitude increased with higher excitation velocities.

Conclusions:

  • The VMD-SS method provides a robust approach for analyzing impact vibrations in railway systems with damaged rails.
  • Accurate extraction of impact vibrations aids in assessing structural integrity and preventing potential failures.