Comparison of different noise sources for the simulative cabin noise assessment of an electrically propelled regional aircraft

The rising number of passengers transported by aircraft leads to more flight traffic, further increasing the environmental impact of the aviation sector. In order to combat the growing environmental impact, the Cluster of Excellence Sustainable and Energy Efficient Aviation of TU Braunschweig aims to advance research towards a climate neutral aviation industry, especially with the design of an electrically propelled short-range regional aircraft, among others. In the conscience of passengers, the focus is also shifted towards a healthy and comfortable travel experience. One of the main factors influencing these aspects is noise inside the aircraft cabin. A lower noise impact can help increase the technology acceptance and further push towards more sustainable airborne transport solutions. This contribution aims to simulatively assess and compare the sound pressure levels inside the passenger cabin of an electric propeller aircraft. The focus is laid on two of the most important noise sources: the tonal propeller excitation as well as the sound field beneath the turbulent boundary layer. The paper presents a wave-resolving FE model considering both sources and shows, which sound pressure levels can be expected, while also comparing the frequency spectra separately, therefore enabling early design changes to help reduce the cabin noise.