Experimental Identification of Modal Parameters of Thin Metal Sheets by using of DIC

This contribution deals with the application of modern optical noncontact method -digital image correlation (DIC) -by experimental modal analysis of thin metal sheets. The determination of mode shapes and modal frequencies was performed on sheet samples with simple squared and annular shapes. An optical device served for vibration investigation, created by components of Brüel & Kjær and Polytec companies, was used for independent validation of the results obtained by an additional program Modan, which has been developed at the Technical University of Košice. Two different types of vibration exciters were used to energize the samples -an acoustic white noise and a mechanical modal hammer.