Department of Aircraft Design - ITA

Aircraft Design Department
Airplane design
Airplane Noise Modeling for Airplane Optimization
• Noise estimation methods used for design optimization are:
– Airframe noise: ESDU Data Sheets;
– Engine: NASA interim reports;
– Atmospheric attenuation: FAA
• Methods were used in NASA’s ANOPP (Aircraft NOise Prediction Program),
developed in the late 1970s from both experimental and theoretical data;
• All the methods provide means to calculate SPLs for each of the 24
standard frequencies (50 Hz to 10 kHz);
• Airframe and Engine components’ SPLs are combined into Airplane SPLs;
• Airplane SPLs are converted into EPNdBs;
• Methods were coded and combined into a noise calculation unit called
PANPA (Parametric Airliner Noise Prediction Architecture).