Optimization of anisotropic sandwich beams for higher sound transmission loss

This study aims to predict the vibration damping and sound transmission properties of composite laminated thin-walled structures with the attached dynamic vibration absorbers systems. In this paper, the effective stiffness constants (the equivalent Timoshenko beam) of sandwich type laminates and their damping properties have been determined by using a procedure based on multi-level numerical schemes. Numerical evaluations obtained for the vibration of the laminates have been used to determine the displacement field for the analysis of the vibration and sound transmission properties of laminated composite beams in the lower frequency range.