A study on multi-layered sound-proof structure in payload fairing to reduce interior sound pressure level

Abstract

Sound-absorbed poroelastic materials are applied on vibrating structures to suppress noise inside a closed compartment. These materials generally reduce transmission of vibration and absorb noise generated in a closed compartment. In this work, we propose new functions by using transmissibility of volume velocity and dissipated power to evaluate performance of sound-absorbed poroelastic materials applied in a closed cavity as alternatives to conventional sound absorption coefficient and transmission loss that may have some difficulties to be adopted in closed environment.