A Comparative Analysis of the Subjective Assessment of Standard and Noise Abatement Aircraft Procedures

摘要

Aircraft noise and the annoyance it produces is a significant modern problem for residents inairport vicinities. Besides lowering noise at the source, via new or adapted aircraft and enginedesigns, aircraft noise impact on the ground can be reduced via noise abatement flightprocedures. The analyses of such procedures have thus far focused on the lower decibel andweighted average values which they may produce, but such averaged values can hide thecomplete characteristics of noise, such as for instance the contribution of tonal components. Thispaper intends to present an analysis of a more subjective assessment of current aircraft overcomplete standard and noise abatement movements. The analysis is based on two aircraft ofclearly distinct Top-Level Requirements (TLRs) to see if the noise benefit varies between themfor the same procedures. Two perspectives are analyzed, one from an aircraft level where it isanalyzed if the currently used metrics PNL, PNLT, EPNL among others suffice compared toaveraged decibel values or is extra information obtained from psychoacoustic measures ofloudness (Zwicker1) and tonality (Aures2), regarding annoyance of complete aircraft movements.Ground exposure contours for various metrics are modeled for an overview of the noise impact.The other perspective presented is from the ground, from specific locations where benefits toresidents are expected. Auralizations (i.e. aural simulations) are made of both aircraft and eachconsidered movement and the synthetic audio is analyzed with regards to loudness and tonality.