Acoustic and Vibration Response of Flow-Excited Panels: Laboratory Reproduction and Panel Configuration Studies

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The external turbulent boundary layer (TBL), always present around the fuselage of an aircraft during flight, is typically the major source of jet aircraft cabin noise in cruise flight. During long exposure periods, high noise levels produce hearing loss, fatigue, loss of concentration, and can influence the respiratory rate, heart functions and central nervous system. Most aircraft manufacturers are interested in a better understanding of the physics associated with aircraft acoustics. In spite of the growing interest, there is still a lack of understanding of the mechanisms involved in TBL-induced noise in aircraft. Furthermore, in-flight measurements of aircraft noise are extremely costly and time-consuming, and therefore, the laboratory reproduction of in-flight conditions has attracted more attention in recent years. In this context, the present research proposal aims to advance the current state-of-the-art in the understanding of the physics associated with TBL-induced noise, and the laboratory reproduction of the acoustic and vibration response of TBL-excited aircraft panels. Piezoelectric (PZT) actuators, strategically embedded in the test panel, will be used to excite the structure, to reproduce the panel response to the TBL. Different panel configurations will be tested and analyzed, to investigate the best configuration for the noise reduction goal. The proposed research will create an experimental platform that enables the development of a solid methodology for the laboratory reproduction of the acoustic and vibration response of TBL-excited panels. The availability of experimental data will allow the validation of computational approaches for the prediction of noise and vibration of TBL-excited structures. The successful outcome of this research will bring extremely valuable knowledge involving the development of innovative technology, which can be applied to the aircraft industry, in Canada and internationally. The availability of this technology will bring an economic advantage to aircraft industry. In addition, a better understanding in both experimental and computational analysis of TBL-excited structures would benefit numerous other areas, such as, fluid flow in pipes, engine nacelle design, and the automotive industry.