Abstract:This paper presents an efficient computational process for the synthesis of a low-frequency controller aimed at reducing helicopter rotor BVI noise by application of the active twist rotor (ATR) concept. It is based on an optimal, multi-cyclic, control approach where distributed torque loads actuated by smart materials are used to twist rotor blades at the 2/rev frequency. Rotor simulations are obtained by combining aerodynamic, aeroelastic and aeroacoustic tools able to capture wake-blade miss distance, which… Show more
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