Applied Mathematics Seminar
Date/Time/Room: Friday (
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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