A synthetic wall pressure model for the efficient simulation of boundary layer induced cabin noise

Abstract

This work presents a complete numerical procedure for the simulation of the vibroacoustic response of a structure to a turbulent boundary layer. As a paradigm for the sound transmission into an aircraft cabin, a generic set-up is studied that is composed out of a closed cavity which is separated from a turbulent boundary layer by an elastic flat plate. The focus is on a new stochastic model for synthesizing the instationary surface pressure fluctuations. Due to the use of a random Particle mesh method with recursive filters, this method is very efficient. The spatial-temporal pressure field is used as input in a finite element method to calculate the vibroacoustic response of the elastic plate. The sound entrainment into the cabin is simulated with the finite element method as well. Results encompass the calculation of surface pressure characteristics, acceleration spectra of the surface, and sound spectra of the closed cavity. The results are compared with experimental data taken from the EC founded project ENABLE.