Parallel Blade-Vortex Interaction Modelling for Helicopter Rotor Noise Control Synthesis

The present work deals with a methodology for the alleviation of loads and corresponding emitted noise generated by blade-vortex interaction (BVI) phenomena occurring on helicopter main rotors in low-speed, descent flight. It consists of a multi-cyclic, optimal control approach driving higher harmon...

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Bibliographic Details
Published in:International journal of aeroacoustics 2014-12, Vol.13 (7-8), p.587-606
Main Authors: Modini, Sara, Graziani, Giorgio, Bernardini, Giovanni, Gennaretti, Massimo
Format: Article
Language:English
Subjects:
Blade-vortex interaction
Computer simulation
Descent
Emittance
Helicopters
Higher harmonics
Methodology
Noise control
Rotors
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Summary:The present work deals with a methodology for the alleviation of loads and corresponding emitted noise generated by blade-vortex interaction (BVI) phenomena occurring on helicopter main rotors in low-speed, descent flight. It consists of a multi-cyclic, optimal control approach driving higher harmonic blade pitch actuation. First, for the specific flight condition to be examined, the BVI phenomena are simulated as equivalent two-dimensional, multi-vortex, parallel BVI problems and then a local controller methodology is applied for the efficient identification of the closed-loop control algorithm. In order to assess the capability of the proposed control approach to alleviate rotor blade loads and emitted noise, the results of a numerical investigation concerning a realistic helicopter main rotor in descent flight are presented and discussed.
ISSN:1475-472X
2048-4003
DOI:10.1260/1475-472X.13.7-8.587