Article
Influence of Different Auto Spectral and Cross Spectral Density Models on Aircraft Cabin Noise (en)
* Presenting author
Abstract:
In order to evaluate aircraft cabin noise in an early design phase, vibroacoustic models of appropriate fidelity have to be created and excitations have to be included. One of the main noise sources of cabin noise are the pressure fluctuations on the outer skin due to a turbulent boundary layer. Recently, multiple methods allowing the computation of those pressure fluctuations have been developed. However, the auto spectral and cross spectral density have to be evaluated, which can be undertaken by multiple newly developed models. RANS data from aerodynamic simulations is used as an input for FEM simulations of the cabin noise. This contributions sheds light on the question how these different models influence the sound pressure level inside the aircraft cabin. Here, the focus is laid on whether the different models for ASD and CSD computation only yield a difference due to the stochastic nature of the TBL or if the difference in the SPL is due to the methodological difference of the models. This helps to further improve fully simulative cabin noise assessments by allowing RANS data to be used in early development of novel aircraft technologies and leads to an early inclusion of acoustics in the design process.