Analytical Identification of Blade-Vortex Interaction Noise Controller Suited for Miniature Trailing Edge Effectors
Sara Modini, Giorgio Graziani, University of Rome La Sapienza; Giovanni Bernardini, Massimo Gennaretti, Roma Tre University
May 17, 2016
Analytical Identification of Blade-Vortex Interaction Noise Controller Suited for Miniature Trailing Edge Effectors
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Analytical Identification of Blade-Vortex Interaction Noise Controller Suited for Miniature Trailing Edge Effectors
Authors / Details: Sara Modini and Giorgio Graziani, University of Rome La Sapienza; Giovanni Bernardini and Massimo Gennaretti, Roma Tre UniversityAbstract
With the aim of alleviating the noise annoyance generated by helicopter main rotors in BVI flight conditions, the present work focuses on the presentation and application of a methodology for the identification of a multi-cyclic harmonic controller based on the actuation of Micro-Trailing Edge Effectors. Because of their low-power requirements, these are particularly suited for this kind of high-frequency applications. The control devices setting is selected on the basis of the BVI scenario, while the actuation law is efficiently identified through an analytical process based on the Theodorsen theory. The proposed methodology is validated by application to a realistic helicopter main rotor in descent flight, and preliminary results concerning its capability to alleviate BVI loads and associated emitted noise are presented and discussed. For controller identification and validation purposes, Micro-Trailing Edge Effectors are replaced by trailing edge plain flaps which provide equivalent aerodynamic responses suitably predicted by potential-flow aerodynamic solvers.
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