NON-CONTACT EXCITATION SYSTEM TO HIGHLIGHT THE VIBRATION MODES OF BEAMS. - Paun, Rusalin Lucian; Gillich, Gilbert-Rainer; Tufisi, Cristian; Gillich, Nicoleta (Annals of 'Constantin Brancusi' University of Targu-Jiu. Engineering Series / Analele Universităţii Constantin Brâncuşi din Târgu-Jiu. Seria Inginerie, 2022)