Open Access
Table 1.
Overview of the main differences between sonAIR and best-practice model FLULA2.
| Feature | sonAIR | Best-practice model FLULA2 |
|---|---|---|
| Model | Semi-empirical time-step model, separate sound emission and propagation, spectral calculation | Empirical time-step model, combined sound emission andpropagation, A-weighted sound level |
| Emission model directivity | 3D (longitudinal and lateral) | 2D (longitudinal) |
| Sound propagation | Geometric divergence, atmospheric absorption, ground reflections according Maekawa [17] method, shielding by terrain, foliage attenuation; (shielding and reflections of buildings1, forest and cliff reflections2) | Geometric divergence, atmospheric absorption, shielding by terrain, lateral attenuation (attenuation of the level of the sound propagating on the ground and to the side of flight path according [27]) |
| Flight trajectories | 3D position, speed, N1 (+ airplane configuration if information is available)2 | 3D position, speed |
| Terrain data | Elevation and ground cover | Elevation |
Notes. (1)Shielding of buildings within airport premises applied here, but no reflections applied here. (2)Not applied here.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.