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783 - Evaluation of TBL excited cfrp fuselage structure noise transmission loss
Paonessa A., Di Glulio M., De Rosa S., Franco F., Imperatore B.
Abstract
ALENIA Aeronautics launched in the beginning of this year a challenging research project aimed to increase the level of knowledge about the CFRP structure Transmission Loss when excited by the turbulent boundary layer. The TBL excitation is the primary noise source of a turbofan aircraft. Alenia is fully involved in the design of BOEING 787 novel fuselage, and this development activity has been concurred with Boeing. In the paper, the project will be presented emphasizing the TBL modeling and the relevant structure response. The validation of the modeling approaches will be performed with a test campaign based on measurements on small flat unstiffened and stiffened structure components in two wind tunnel facilities: the former at CIRA and the latter at Alenia, both covering a wide Mach number range from subsonic up to supersonic flow. Both facilities will be modified in order to improve their aeroacoustic performances, before activating a massive experimental campaign aimed at getting confidence on the effect of the Mach number and the relevant turbulent boundary layers figures, such as the well-know displacement thickness. Furthermore, several noise source models will be tested in order to understand their capability to predict the fuselage panel response and relevant noise transmission. The project team experience was consolidated trough the participation to several Research programs on the same topics forming an integrated team fully capable to face such multidisciplinary argument. Two University and two Research Centers will complement the main role played by ALENIA in cooperation with Boeing.
Citation
Paonessa A.; Di Glulio M.; De Rosa S.; Franco F.; Imperatore B.: Evaluation of TBL excited cfrp fuselage structure noise transmission loss, CD-ROM Proceedings of the Thirtheenth International Congress on Sound and Vibration (ICSV13), July 2-6, 2006, Vienna, Austria, Eds.: Eberhardsteiner, J.; Mang, H.A.; Waubke, H., Publisher: Vienna University of Technology, Austria, ISBN: 3-9501554-5-7