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Abstract:

This paper presents a model-based sound synthesis approach for aircraft flyover noise. The sound synthesis approach helps to better understand sound quality differences among various types of aircrafts in both landing and take-off conditions and forms an excellent basis to design target sounds with improved noise signature. The presented research is one of our core activities in the EU project "SEFA" (Sound Engineering for Aircraft; coordinator: Dornier GmbH, Germany). This project aims at developing technology design criteria to make aircrafts more acceptable from a noise signature point of view. The synthesis of aircraft flyover noise is based on a sound synthesis model that is identified from sound recordings near the ground. A sound synthesis model is a compact and sound-quality-accurate model consisting of Doppler shifted tonal components and third octave noise bands to characterize the broadband noise. The reflection characteristics of the ground and the time-delay between the direct incident and reflected sound are taken into consideration to describe the typical interference phenomena in the sounds. The model identification and sound synthesis concept are illustrated and validated with a typical aircraft sound. The capabilities of the approach to target sound design are briefly discussed.