Energy Flow Analysis in Vibrating Systems by Laser Vibrometer Measurements

In this paper an experimental analysis of the energy transmission in vibrating structures is considered. The classical discretization techniques (FEM, BEM) fail when one tries to solve high-frequency dynamic problems. At present, SEA is the most acknowledged theory for providing such kind of solution, giving information on the stored mechanical energy and on the dissipated mechanical power between the modal subsystems. Aim of the present work is to study the vibrating behavior of three coupled plates and compare the SEA solution with the experimental results. The experimental test is performed suspending the system by soft springs to simulate free boundary conditions and exciting the plates by a white random noise. A grid of points is selected on the three plates. The energy values are obtained by measuring the velocity of the grid points by a laser vibrometer.In this paper an experimental analysis of the energy transmission in vibrating structures is considered. The classical discretization techniques (FEM, BEM) fail when one tries to solve high-frequency dynamic problems. At present, SEA is the most acknowledged theory for providing such kind of solution, giving information on the stored mechanical energy and on the dissipated mechanical power between the modal subsystems. Aim of the present work is to study the vibrating behavior of three coupled plates and compare the SEA solution with the experimental results. The experimental test is performed suspending the system by soft springs to simulate free boundary conditions and exciting the plates by a white random noise. A grid of points is selected on the three plates. The energy values are obtained by measuring the velocity of the grid points by a laser vibrometer