Onera has developed a model and implemented simulations to assess noise annoyance due to the passing of existing or virtual aircraft. Comparisons with flight measurements are excellent. Sound synthesis enables the result to be heard.
Currently, ONERA is involved together with the Cergy Pontoise University, the INSA-Lyon and the company Genesis in the Parasoft project (FRAE1 project) which is focused on evaluating noise nuisance due to the passing of existing passenger aircraft or of aircraft imagined for the future.
The Carmen software module provided by Onera simulates the sound of planes on the ground by modeling the aircraft noise sources, installation effects and acoustic propagation in the lower atmosphere. Carmen was developed by Onera acousticians and integrated into the IESTA3 platform Clean Airport application.
Carmen’s validation was performed by confronting it with results obtained from flight tests, in particular those from the European project Awiator3 measurement campaign, conducted in Tarbes in 2006 with an A340.
Carmen simulates the noise spectrum during the trajectory. The sound synthesis performed by the company Genesis4, which was a partner in the study, made it possible to build the database, which must be assessed by auditors.
Comparison of simulation/ ground measurements
for an A340 flying at 150 knots (280 km/h)
Thanks to Carmen, the IESTA platform will enable the impact of new aircraft configurations to be estimated, as well as that of motors whose perceived noise would be less unpleasant and of new flight paths or even devices to reduce noise to be applied to the noise perceived by people living near airports
1 FRAE: Fondation de Recherche pour l'Aéronautique et l'Espace [research foundation for aeronautics and space]
2 Awiator Campaign: see http://ec.europa.eu/research/transport/news/items/all_systems_checked_out_in_awiator_s_flight_test_en.htm
3 IESTA: Infrastructure d’Evaluation de Systèmes de Transport Aérien [air transportation system evaluation infrastructure]. Clean Airport is its first operational application, intended for the evaluation of the environmental impact of air transport systems, a concept that can be broken down to the scale of a single device or of an entire fleet. See www.onera.fr/en/dcps/iesta.
4 Genesis: company that specializes in acoustics, psychoacoustics and sound design: http://www.genesis-acoustics.com