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Home > Seminars and Colloquia > Abstracts |
Applied Mathematics SeminarDate/Time/Room: Friday ( Speaker:
Dr. Sidney Xue, Bell Helicopter Textron, Inc. " Kirchhoff Method for Computation of Helicopter
Rotor Noise"
Abstract:
Helicopters have been proven to be economical and convenient vehicles
with their ability to land, take-off and maneuver in areas inaccessible to
fixed-wing aircraft. However, the
noise they generate can severely restrict their usage in both civilian and
military operations. When it occurs,
helicopter impulsive noise is the loudest and the most annoying. The impulsive noise usually can be broken
down to High-Speed Impulsive (HSI) noise and Blade-Vortex Interaction (BVI)
noise. A computational efficient method, Kirchhoff method was developed to predict HSI and BVI
noise (Ph.D dissertation work with Prof. A.S. Lyrintzis at University of Minnesota, 1994). A three-dimensional full potential CFD code
was used for calculation of the nonlinear aerodynamic near field, a Kirchhoff formulation with a rotational control surface
are used to compute the far-field acoustic signals. The computed results showed a good
agreement with experimental results.
However, some limitations will be also discussed.
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