Theoretical and experimental investigation of effect of boundary conditions on SEA parameters for idealised subsystems

Abstract

The Statistical Energy Analysis (SEA) has emerged as an effective method to predict the vibro-acoustic response of the systems subjected to payloads under different boundary conditions. The vibro-acoustic response of any system mainly depends on the four essential parameters of SEA such as modal density, damping loss factor, coupling loss factor, and power (input, dissipated, transmitted). In the present work, the modal density of an idealized subsystem (i.e., a rectangular plate) has been evaluated by employing theoretical and experimental approach. To study the effect of different boundary conditions on the modal density various boundary conditions such as free, simply supported and fully fixed have been considered. To analyse the effect of material properties on the modal density, different materials such as mild steel, stainless steel and aluminium are taken into consideration. It has been observed that the boundary condition do not affects theoretical modal density for all considered materials like MS, SS and AL, at the same time it significantly affects the experimental modal density. From the considered materials MS and SS exhibits higher modal densities than the AL plate, this is because of the material properties such as young’s modulus and density of the material.