Vibrations and noise damping of porous materials

Abstract

Study of the sound attenuation by means of Kundt s tube measurements (in the frequency range of 16 to 6300 Hz) as well as the vibration damping (in the frequency range of 50 to 2500 Hz) are related with the structural material characteristics such as mcchanical tensile modulus, free voids volume and porosity. Effect of the mutual sandwich combination of selected materials interconnected by suitable bonding agents or by simple mechanical contacts will be judged with respect to the transmission of the whole structural element. Obtained experimental results of both acoustic performance and vibration damping will be generalized by means of empirical equations and will be interconnected with selected material mechanical and geometrical characteristics.© (2006) by the International Institute of Acoustics & Vibration.