Multimodal dispersive waves in a free rail: Numerical modeling and experimental investigation

• Phase and group velocities of waves in a free rail are better understood. The operating deflection shapes measured to identify coupled modes. A synchronized multiple-acceleration wavelet is developed for dispersion analysis. Experimental methods study multimodal dispersive proposed. In this paper, we present solution method based on finite element (FE) modeling predict rail. As well as the modal behaviors wavenumber-frequency relations, phase six types propagative also derived discussed detail frequency range 0–5 kHz. To experimentally distinguish different wave modes, shape (ODS) measurement approach employed laboratory. ODS from spatial distribution imaginary parts FRFs. We propose (SMAW) propagation characteristics vertical, longitudinal lateral directions estimated power spectra (WPSs). good agreement between simulation terms mode ODSs, curves, indicates that SMAW approaches capable distinguishing modes measuring characteristics. situ experimental results further demonstrate effectiveness identification analysis field track.