About the project

During the last decades, civil aviation has become an important economic, logistical and strategic industry in a world increasingly more dynamic and globalized. However, such advances bring with them some side effects such as the aircraft noise growth. This generates environmental impacts - direct and indirect effects on the health of populations exposed continuously -, economic - operational limitations, taxation and even fines - and the regulatory structure of the sector. Moreover, technological challenges appear such as new paradigms in design and conception of new aircrafts. In this context, the Brazilian initiative Silent Aircraft arise in 2010 aiming to develop partnerships and bring together relevant resources and efforts to such.

The Silent Aircraft project hosted at UFSC, in partnership with the LVA and Embraer, is in its third phase. In the first stage, it was we developed a comprehensive technical and strategic study within the aeroacoustics field. In the next step, the development of experiments for acoustic and velocity fields investigations of a simple and cold jet at the laboratory scale (RIG) at a range of Mach number up to 0.9, and the analysis and validation of several numerical methodologies into Computational Aeroacoustics (CAA) were performed. In addition, the application of these efforts and results to set guidelines for future projects.

Currently, the POLO activities in Silence Project, third phase, consists in developing numerical simulations of acoustic jets applying hybrid methodologies into CAA by using Lattice-Boltzmann Methods (LBM) and acoustic analogies as the Ffwocs-Williams and Hawkings (FWH) surface for aircraft jet noise prediction. Furthermore, the design operates in the development of semi-empirical models by the use and construction of an extensive database of numerical and experimental data from RIG, which are tools that provide fast and flexible obtaining acoustic results in industrial applications. Despite of the main topics of interest, we can cite academic and applied research on the phenomenology concerning about installation noise, which occurs due jet-airframe interaction, and the development of semi-empirical models.

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