"An aerodynamic\/aeroacoustic solution methodology for predction of tonal noise emitted by helicopter rotors and propellers is presented. It is particularly suited for configurations dominated by localized, high-frequency inflow velocity fields as those generated by. blade–vortex interactions. The unsteady pressure distributions are determined by the sectional, frequency-domain Küssner–Schwarz formulation, with downwash including the wake inflow velocity predicted by a three-dimensional, unsteady, panel-method formulation suited for the analysis of rotors operating in complex aerodynamic environments. The radiated noise is predicted through solution of the Ffowcs Williams–Hawkings equation. The proposed approach yields a computationally efficient solution procedure that may be particularly useful in preliminary design\/multidisciplinary optimization applications. It is validated through comparisons with solutions that apply the airloads. directly evaluated by the time-marching, panel-method formulation. The results are. provided in terms of blade loads, noise signatures and sound pressure level contours. An estimation of the computational efficiency of the proposed solution process is also presented.. "

Gennaretti, M., Testa, C., Bernardini, G. (2013). An Unsteady Aerodynamic Formulation for Efficient Rotor Tonal Noise Prediction. JOURNAL OF SOUND AND VIBRATION, 332(25), 6743-6754 [10.1016/j.jsv.2013.07.024].

An Unsteady Aerodynamic Formulation for Efficient Rotor Tonal Noise Prediction

GENNARETTI, MASSIMO;BERNARDINI, Giovanni
2013-01-01

Abstract

"An aerodynamic\/aeroacoustic solution methodology for predction of tonal noise emitted by helicopter rotors and propellers is presented. It is particularly suited for configurations dominated by localized, high-frequency inflow velocity fields as those generated by. blade–vortex interactions. The unsteady pressure distributions are determined by the sectional, frequency-domain Küssner–Schwarz formulation, with downwash including the wake inflow velocity predicted by a three-dimensional, unsteady, panel-method formulation suited for the analysis of rotors operating in complex aerodynamic environments. The radiated noise is predicted through solution of the Ffowcs Williams–Hawkings equation. The proposed approach yields a computationally efficient solution procedure that may be particularly useful in preliminary design\/multidisciplinary optimization applications. It is validated through comparisons with solutions that apply the airloads. directly evaluated by the time-marching, panel-method formulation. The results are. provided in terms of blade loads, noise signatures and sound pressure level contours. An estimation of the computational efficiency of the proposed solution process is also presented.. "
2013
Gennaretti, M., Testa, C., Bernardini, G. (2013). An Unsteady Aerodynamic Formulation for Efficient Rotor Tonal Noise Prediction. JOURNAL OF SOUND AND VIBRATION, 332(25), 6743-6754 [10.1016/j.jsv.2013.07.024].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/267581
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