Determining an empirical emission model for the auralization of jet aircraft

<p>Aircraft noise is a major issue in urban areas and is one of the research topics <br> within the FP7 SONORUS project. Current methods for determining the impact of <br> aircraft noise on annoyance and sleep disturbance are based on energetic <br> quantities neglecting the dynamic character of the sound. To obtain a more <br> complete representation of annoyance, one should predict the audible aircraft <br> sound and determine the impact of the aircraft sound on people.</p> <p>In a related project at Empa, sonAIR, recordings were made of aircraft taking off and landing. These recordings were made at several positions and with several <br> microphones simultaneously. Combined with cockpit data, flight path information <br> and an inverse sound propagation model, this gives the possibility to determine <br> the emission as function of aircraft conditions and observer angle.</p> <p>An inverse sound propagation model is used to determine the emission in the <br> time-domain. The obtained signal corresponds to the immission of a microphone <br> flying along with the aircraft and rotating about it. The time-domain approach <br> allows extracting narrowband information like tones and time-dependent variations like modulations.