Contribution of stiffeners to the sound transmission of aircraft skin panels

摘要

Traditionally, the sound radiation of aircraft skin panels is calculated using a structural model with stiffhers and an acoustical model where the stifrhers are omitted. We present a numerical study on the impact of this omission. The numerical model consists of three parts. Firstly, the pressures in a diffuse sound field are modeled. Secondly, a Finite Element (FE) model describes the structural response caused by the sound field. Thirdly, a Boundary Element (BE) model yields the sound intensity.