Print Email Facebook Twitter Multimodal dispersive waves in a free rail Title Multimodal dispersive waves in a free rail: Numerical modeling and experimental investigation Author Zhang, P. (TU Delft Railway Engineering) Li, S. (TU Delft Railway Engineering) Nunez, Alfredo (TU Delft Railway Engineering) Li, Z. (TU Delft Railway Engineering) Date 2021 Abstract In this paper, we present a solution method based on finite element (FE) modeling to predict multimodal dispersive waves in a free rail. As well as the modal behaviors and wavenumber-frequency dispersion relations, the phase and group velocities of six types of propagative waves are also derived and discussed in detail in the frequency range of 0–5 kHz. To experimentally distinguish different types of wave modes, the operating deflection shape (ODS) measurement approach is employed in the laboratory. ODS is measured from the spatial distribution of imaginary parts of the FRFs. We also propose a synchronized multiple-acceleration wavelet (SMAW) approach to experimentally study the propagation and dispersion characteristics of waves in a free rail. The group velocities in the vertical, longitudinal and lateral directions are estimated from the wavelet power spectra (WPSs). The good agreement between the simulation and measurement in terms of mode shapes and ODSs, wavenumber-frequency dispersion curves, and group velocities indicates that the ODS and SMAW approaches are capable of distinguishing different wave modes and measuring wave propagation and dispersion characteristics. In situ experimental results further demonstrate the effectiveness of the ODS measurement for coupled modal identification and the SMAW approach for wave dispersion analysis of the rail in a field track. Subject Multimodal dispersive wavesOperating deflection shapesPhase and group velocitiesSynchronized multiple-acceleration wavelet To reference this document use: http://resolver.tudelft.nl/uuid:932fb88a-6b18-4054-8a38-2b077bda49b5 DOI https://doi.org/10.1016/j.ymssp.2020.107305 ISSN 0888-3270 Source Mechanical Systems and Signal Processing, 150, 1-22 Part of collection Institutional Repository Document type journal article Rights © 2021 P. Zhang, S. Li, Alfredo Nunez, Z. Li Files PDF 1_s2.0_S0888327020306919_main.pdf 6.53 MB Close viewer /islandora/object/uuid:932fb88a-6b18-4054-8a38-2b077bda49b5/datastream/OBJ/view