A Summary And Evaluation Of Semi Empirical Methods For The Prediction Of Helicopter Rotor Noise PDF Download

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Recent Advances in Aeroacoustics

Recent Advances in Aeroacoustics
Author: A. Krothapalli
Publisher: Springer Science & Business Media
Total Pages: 511
Release: 2012-12-06
Genre: Science
ISBN: 146124840X

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The Joint Institute for Aeronautics and Acoustics at Stanford University was established in October 1973 to provide an academic environment for long-term cooperative research between Stanford and NASA Ames Research Center. Since its establishment, the Institute has conducted theoretical and experimental work in the areas of aerodynamics, acoustics, fluid mechanics, flight dynamics, guidance and control, and human factors. This research has involved Stanford faculty, research associates, graduate students, and many distinguished visitors in collaborative efforts with the research staff of NASA Ames Research Center. The occasion of the Institute's tenth anniversary was used to reflect back on where that research has brought us, and to consider where our endeavors should be directed next. Thus, an International Symposium was held to review recent advances in the fields relevant to the activities of the Institute and to discuss the areas of research to be undertaken in the future. This anniversary was also chosen as an opportunity to honor one of the Institute's founders and its director, Professor Krishnamurty Karamcheti. It has been his crea tive inspiration that has provided the ideal research environment at the Joint Institute.


New Computational Methods for the Prediction and Analysis of Helicopter Noise

New Computational Methods for the Prediction and Analysis of Helicopter Noise
Author: Roger C. Strawn
Publisher:
Total Pages: 18
Release: 1996
Genre: Fluid dynamics
ISBN:

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Abstract: "This paper describes several new methods to predict and analyze rotorcraft noise. These methods are: 1) a combined computational fluid dynamics and Kirchhoff scheme for far-field noise predictions, 2) parallel computer implementation of the Kirchhoff integrations, 3) audio and visual rendering of the computed acoustic predictions over large far-field regions, and 4) acoustic tracebacks to the Kirchhoff surface to pinpoint the sources of the rotor noise. The paper describes each method and presents sample results for three test cases. The first case consists of in-plane high-speed impulsive noise and the other two cases show idealized parallel and oblique blade-vortex interactions. The computed results show good agreement with available experimental data but convey much more information about the far-field noise propagation. When taken together, these new analysis methods exploit the power of new computer technologies and offer the potential to significantly improve our prediction and understanding of rotorcraft noise."


Report No. FAA-EE.

Report No. FAA-EE.
Author: United States. Federal Aviation Administration. Office of Environment and Energy
Publisher:
Total Pages: 132
Release: 1979
Genre: Aeronautics
ISBN:

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Paper

Paper
Author:
Publisher:
Total Pages: 496
Release: 1986
Genre: Mechanical engineering
ISBN:

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Rotorcraft Noise

Rotorcraft Noise
Author:
Publisher:
Total Pages: 454
Release: 1982
Genre:
ISBN:

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Broadband Rotor Noise Analyses

Broadband Rotor Noise Analyses
Author: Albert R. George
Publisher:
Total Pages: 104
Release: 1984
Genre: Rotors
ISBN:

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