Prediction of noise transmission through anisotropic multilayered aircraft fuselage, using finite element models including porous, elastic and fluid domains

摘要

Prediction of noise transmission through anisotropic multilayered aircraft fuselage, using finite element models including porous, elastic and fluid domains is carried out. A passenger aircraft carrier is modelled using a novel finite element formulation, utilising the rotationally symmetric geometry in order to greatly reduce the computational cost. The model consists of anisotropic porous, elastic and fluid domains. The axi-syrnmetry of the structure allows for the use of analytical functions describing the wave propagation in the circumferential spatial directions, and thus reducing the number of required finite elements considerably. It is found that a fairly limited number of modes are required to satisfactorily describe the sound fields.