Molina-Viedma, ÁngelFelipe-Sese, LuisLopez-Alba, EliasDíaz, Francisco A.2025-01-132025-01-132020-02-01Ángel J. Molina-Viedma, Luis Felipe-Sesé, Elías López-Alba, Francisco A. Díaz, Comparative of conventional and alternative Digital Image Correlation techniques for 3D modal characterisation, Measurement, Volume 151, 2020, 107101, ISSN 0263-2241, https://doi.org/10.1016/j.measurement.2019.107101.1873-412Xhttps://doi.org/10.1016/j.measurement.2019.107101https://www.sciencedirect.com/science/article/pii/S0263224119309674?via%3Dihubhttps://hdl.handle.net/10953/3911The integration of Fringe Projection and 2D-DIC is a low-cost optical technique which employs a single camera for full-field 3D displacement measurements using RGB colour encoding to filter coexisting fringe and speckle patterns out from a single image. In this work, this technique was explored together with conventional 3D-DIC for challenging modal analysis on a large aeronautical panel under random excitation. Modal identification was performed using the Least-Squares Complex Exponential approach. Multiple degree-of-freedom methods have been avoided in previous works or just employed in one direction due to high memory requirements to process 3D full-field data. In this work, the 3D modal characterisation was addressed with especial mention to mode shapes. Hardware limitations makes FP + DIC less sensitive than 3D-DIC and hence more suitable for lower frequencies. Nevertheless, the obtained modal parameters showed high agreement and hence FP + DIC demonstrated to be a cost-effective alternative for 3D modal analyses.engAtribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/Digital Image Correlationmodal analisisoptical techniqueexperimental mechanicsinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess