C.I. Florentin, L.C. Chow

British Aerospace undertook to investigate the aerodynamic and acoustic implications of installing wing mounted open rotors on regional aircraft. The main acoustic problem with the installation was considered to be low frequency ( less than 500 Hz) propeller generated airborne transmitted cabin noise. The first step in controlling this noise was to model it. The modelling method consisted of building a detailed finite element models of the fuselage structure and interior acoustic cavity. A propeller generated airborne pressure field was used to excite the fuselage model and the fuselage response was used to excite the acoustic cavity to produce interior noise contours. The normal modes of the finite element models were calculated first and then the response found using modal superposition. At each stage the results were compared with experimental data obtained from CARF ( Cabin Acoustic Research Facility - An aircraft fuselage positioned next to a contra-rotating propeller engine). Two fuselage models were built, one with minimal interior trim and the other fully trimmed. The modelling of the untrimmed fuselage gave good agreement with the experimental data for the interior noise levels, but not such good agreement for the noise field shape. The modelling of the trimmed fuselage did not show such good agreement.

First Joint CEAS/AIAA Aeroacoustics Conference, München, 1995

Conference Paper

englisch

21,0 x 29,7 cm, 6 Seiten

DGLR-Bericht, 1995, 1995-01, First Joint CEAS/AIAA Aeroacoustics Conference - Proceedings; S.329-334; 1995; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1995