R.M. Allen, D.H. Reed

In recent years, noise testing requirements at Boeing have increasingly included the need for flight simulation as well as a quiet and anechoic background environment. This led to a design concept which added a low speed open jet test section to an existing anechoic chamber. The resulting Low Speed Aeroacoustic Facility (LSAF) features a 9x12-foot filleted contraction exit with flow capability from M = .05 to .25. Supply fans and motors are vibration isolated from the test section by massive foundations mounted on air springs. Fan noise is absorbed by a high performance duct silencer, installed in a reinforced concrete duct to minimize flanking path transmission of sound and vibration. Acoustic test capability includes traversing in-flow microphones, a traversing elliptical mirror for noise source location, and numerous stationary out-of-flow microphones. All data are analyzed on line and merged with performance data to provide complete final data within minutes of test run completion. Jet and fan simulators have been developed, and a six-component balance will be installed in mid-1992.

DGLR/AIAA 14th Aeroacoustics Conference, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 9 Seiten

DGLR-Bericht, 1992, 1992-03, DGLR/AIAA 14th Aeroacoustics Conference - Proceedings; S.187-195; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1992