K.S. Brentner, F. Farassat

This paper examines the current status of helicopter noise prediction. A brief history is given followed by a discussion of the status of prediction for each source mechanism. The acoustic analogy approach, and specifically, theories based on the Ffowcs Williams - Hawkings equation are the most widely used for deterministic noise sources. Thickness and loading noise can be routinely predicted given good blade motion and blade loading inputs. Blade-vortex interaction noise can also be predicted well with measured input data, but prediction of airloads with the high spatial and temporal resolution required for BVI is still difficult. No efficient prediction method for high-speed impulsive noise is currently available, but much progress has been made. The best broadband noise prediction currently depends on semi-empirical methods.

DGLR/AIAA 14th Aeroacoustics Conference, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 12 Seiten

DGLR-Bericht, 1992, 1992-03, DGLR/AIAA 14th Aeroacoustics Conference - Proceedings; S.724-735; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics, blade-vortex interaction, helicopters, ffowcs william-hawkings equation

Bibliothek

1992