Aircraft Engine Positioning Psychoacoustic Optimization within Conceptual Aircraft Design

摘要

Several engine over-the-wing (EoW) aircraft are designed to fulfil the same Top Level Aircraft Requirements of a reference aircraft by means of a successive engine position variation. The noise reaching the airport surrounding area is evaluated according to EPNL, loudness, and tonality in a coupled study where the aircraft performance and its relation to noise is analyzed together. The aircraft performance decrease, due to this unconventional configuration, is qualitatively justified since the noise annoyance is reduced thanks to wing noise shielding. A very important tonal reduction is observed. The parameter sensitivity analysis leads to two main results: First, the engines should be placed towards the wing leading edge to enhance the fan discharge noise shielding, and secondly, as near as possible to the fuselage for the purpose of utilizing the larger wing area available to improve shielding. These results should be validated with fan noise models developed for accurately predicting fan noise in the near field.