An Improved VMD Method for Use with Acoustic Impact Response Signals to Detect Corrosion at the Underside of Railway Tracks

Variational Mode Decomposition (VMD) is widely used for inspection purposes. The initial parameters are usually set manually, which a limitation of this technique. In paper, method to automatically select these through combination Singular Value (SVD) and Improved-VMD (IVMD) proposed. VMD applied multiple times with varying K-value parameter. original signal its sub-signals arising from decomposition all subjected SVD. An index representing the relevance between obtained by comparing eigenvalues, calculated result shows effectiveness different parameters. SVD then further selected parameter obtain Shannon entropy, can be in detection classification corrosion on underside rail. Comparing current energy-based methods, entropy IVMD–SVD has advantage reducing environmental interference more uniform energy results. proposed improve impact response signal. rails realised according results method.