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Design of an innovative fuselage cabin noise testing system for regional aircraft

Book Contribution - Book Chapter Conference Contribution

The current interest in sustainable aviation is motivating the development of aircraft with better environmental performance. Within this context, advanced turboprops offer higher fuel efficiency compared to conventional turbofan engines. However, the cabin noise levels of propeller driven aircraft are significantly higher than those in common fanjets. The dominant noise sources in turboprop aircraft are the turbulent boundary layer noise, which is generated by the turbulent airflow exciting the fuselage, and the propeller induced noise caused by the periodic pressure fluctuations produced by the propeller blades passing near the fuselage. This paper presents the design of an innovative noise generation system that will be able to replicate, with a set of loudspeakers, the dynamic excitation given by both the turbulent boundary layer noise and the blade passing noise on a fuselage. The novelty of this system is the use of MIMO feedback controllers to simultaneously achieve desired sound pressure levels and spatial correlations at specific fuselage locations. The aim of the CONCERTO project (GA886836) is to develop cabin noise testing equipment that will be used to evaluate the interior noise of regional aircraft and to aid the development of noise reduction solutions. Firstly, a preliminary analysis of the noise generation system is carried out for a small-scale noise generation set-up. The system components are investigated and MIMO feedback control strategies are introduced. MIMO random control is used to replicate the random pressure field generated by the turbulent boundary layer excitation. The tonal components of the propeller induced excitation are then added to the broadband noise using a time waveform replication technique. The preliminary results for the small-scale set-up show that the power spectral densities of the measured microphone signals converge to those of the references within acceptable tolerance (±1.5 dB). Finally, the design of the modular mechanical structure for the full-scale innovative noise generation system is discussed.
Book: "Advances in Acoustics, Noise and Vibration – 2021" Proceedings of the 27th International Congress on Sound and Vibration
Pages: 1 - 8
Number of pages: 8
ISBN:978-83-7880-799-5
Publication year:2021
Accessibility:Open