Analysis of structural acoustic coupling of plates

In vibration and noise control engineering, vibration of a thin plate backed by a cavity, the sound in this cavity and mutual effects of vibration and sound are of considerable importance in the accurate and realistic design of various machines and vehicles. Due to the mechanical, acoustical or both type of excitation on the thin plate-cavity system, a coupling phenomenon occurs between vibration and sound. This thesis mainly focused on a parametric study based on a vibro-acoustic model including a plate-cavity system in order to examine the coupling effects. All analyses were performed by using I-DEAS Vibro-Acoustic module that uses coupled FEM/BEM approach. The parametric free vibration study includes six cases composed of different cavity depths and plate thicknesses. Forced frequency response analysis covers five different excitations, including harmonic, almost periodic, random structural and acoustical excitations. In this regard, free and forced uncoupled and coupled analyses were evaluated by structural, acoustical and energy point of views.