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- W2100098187 abstract "Aircraft noise is frequently calculated by models using Noise-Power-Distance relations (NPD-tables). Such an approach is common in the Integrated Noise Model (INM) or the method outlined in ECAC Doc. 29. Only a limited correction for atmospheric propagation effects is available through empirical lateral attenuation functions that are intended, as is the model, for multi-event calculations. A new feature, developed at the NLR, is to include the results of ray tracing in a Doc.29-based calculation. As such, the noise model is augmented by detailed propagation effects on a single-event level. Results are demonstrated for two different take-off procedures as Sound Exposure Level (SEL) contours. Consequently, the effects of wind on departure procedures are illustrated and further quantified by predicting awakenings in fictitious communities. The results show that the effects of sound refraction are the largest as the aircraft is low. Therefore, a departure procedure featuring a shallow climb angle shows more effects than procedure with a steeper climb. It is shown that wind effects can clearly lead to asymmetrical contours and awakenings. The results show that there is a potential for noise mitigation based on ambient atmospheric conditions." @default.
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- W2100098187 date "2015-01-01" @default.
- W2100098187 modified "2023-09-27" @default.
- W2100098187 title "Including atmospheric propagation effects in aircraft take-off noise modeling" @default.
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