A New Computational Tool for Noise Prediction of Rotating Surfaces (FACT)
Authors/Creators
Description
The air transport impact on environment is more than
ever a limitative obstacle to the aeronautical industry continuous
growth. Over the last decades, considerable effort has been carried
out in order to obtain quieter aircraft solutions, whether by changing
the original design or investigating more silent maneuvers. The
noise propagated by rotating surfaces is one of the most important
sources of annoyance, being present in most aerial vehicles. Bearing
this is mind, CEIIA developed a new computational chain for
noise prediction with in-house software tools to obtain solutions in
relatively short time without using excessive computer resources. This
work is based on the new acoustic tool, which aims to predict the
rotor noise generated during steady and maneuvering flight, making
use of the flexibility of the C language and the advantages of GPU
programming in terms of velocity. The acoustic tool is based in the
Formulation 1A of Farassat, capable of predicting two important
types of noise: the loading and thickness noise. The present work
describes the most important features of the acoustic tool, presenting
its most relevant results and framework analyses for helicopters and
UAV quadrotors.
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10000674.pdf
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Additional details
References
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- Farassat F. The Kirchhoff Formulas for Moving Surfaces in Aeroacoustics - The Subsonic and Supersonic Cases. Technical Memorandum 110285, NASA, Langley Research Center, Hampton, Virginia, September 1996.
- F. Farassat. Derivation of Formulation 1 and 1A Farassat. Technical report, NASA, March 2007.
- Br`es G.A., Brentner K.S., Perez G., and Jones H.E. Maneuvering rotorcraft noise prediction. Journal of Sound and Vibration, 275:719–738, 2004.
- Brentner K. S., Br`es G. A., G. Perez, and Jones H. E. Maneuvering Rotorcraft Noise Prediction: A New Code for a New Problem. Technical report, In Proceedings of AHS Aero- dynamics, Acoustics, and Test and Evaluation Technical Specialists Meeting, San Francisco, CA, January 2002.
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