9 June 1999 Active twist smart rotor technology for blade-vortex interaction noise reduction
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Abstract
The results of this feasibility study suggest that active blade twist technology is a viable means to reduce blade- vortex interaction (BVI) noise in rotorcraft systems. A linearized unsteady aerodynamics analysis was formulated and successfully validated with computation fluid dynamics analysis. A simple control scheme with three control points was found to be effective for active BVI noise reduction. Based on current-day actuation technology where 1 to 2 degrees of twist per blade activation span is expected, measurable noise reductions of 2 to 4 dB were predicted for the relatively strong, close vortex interactions. For weaker vortex interactions, reductions of 7 to 10 dB were predicted. The required twist actuation per blade span for complete unsteady loading cancellation, however, may be infeasible because of the large stroke and high frequency activation requirements.
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Peter C. Chen, Peter C. Chen, James D. Baeder, James D. Baeder, Robert A. D. Evans, Robert A. D. Evans, John B. Niemczuk, John B. Niemczuk, Paul A. Ross, Paul A. Ross, } "Active twist smart rotor technology for blade-vortex interaction noise reduction", Proc. SPIE 3668, Smart Structures and Materials 1999: Smart Structures and Integrated Systems, (9 June 1999); doi: 10.1117/12.350730; https://doi.org/10.1117/12.350730
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